ICOM orporated IC-746PRO Amateur HF \ VHF Scanning Transceiver User Manual 746PRO INSTRUCTION MANUAL EN pd

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Document ID	183822
Application ID	yEvnFMiSfENvC1jlBuV6DA==
Document Description	Manual Part 1
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Permanent Confidential	No
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Document Type	User Manual
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Date Submitted	2001-12-15 00:00:00
Date Available	2001-12-15 00:00:00
Creation Date	2001-12-06 13:05:05
Producing Software	Acrobat Distiller 3.0J (Windows 版)
Document Lastmod	2001-12-06 13:06:47
Document Title	746PRO_INSTRUCTION_MANUAL(EN.pd.PDF
Document Author:	MasaakiT

INSTRUCTION MANUAL
HF/VHF
ALL MODE TRANSCEIVER
i746PRO
This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause
harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
FOREWORD
PRECAUTIONS
We understand making you have a choice of many different radios in the market place.I want to take a couple of moments of your time to thank you for making
your IC-746PRO your radio of choice, and hope you
agree with Icom’s philosophy of “technology first”.Many
hours of research and development went into the design of your IC-746PRO.
R WARNING RF EXPOSURE! This device emits
Rather than completely redesigning all areas to create
a new radio, the engineering team at Icom decided to
follow in the footsteps of the IC-746 (one of the best
values in the marketplace) with the new “PRO”. Focused on real world improvements compiled over the
last few years from letters, phone calls, E-Mails and
newsgroup postings the engineering team at Icom is
proud to say “many of these changes were compiled
from a list of suggestions from you, the amateur radio
operator!”
R WARNING HIGH VOLTAGE! NEVER attach an
FEATURES
• 32-bit Floating point DSP and 24-bit AD/DA converter
• DSP IF Filter creates 102 types of filter types
• All mode capability covering 160–2 m
• 100 Watt continuous duty cycle
• All mode digital modulation and demodulation
• RTTY demodulator and decoder
• Twin Pass Band Tuning
• RF speech compression with selectable pass band
• Microphone Equalizer
• SSB/CW synchronous tuning
antenna or internal antenna connector during transmission. This may result in an electrical shock or burn.
R NEVER apply AC to the [DC13.8V] jack on the transceiver rear panel. This could cause a fire or ruin the transceiver.
R NEVER apply more than 16 V DC, such as a 24 V
battery, to the [DC13.8V] jack on the transceiver rear
panel. This could cause a fire or ruin the transceiver.
R NEVER let metal, wire or other objects touch any internal part or connectors on the rear panel of the transceiver. This may result in an electric shock.
NEVER expose the transceiver to rain, snow or any liquids.
AVOID using or placing the transceiver in areas with temperatures below –10°C (+14°F) or above +50°C (+122°F).
Be aware that temperatures on a vehicle’s dashboard can
exceed 80°C (+176°F), resulting in permanent damage to
the transceiver if left there for extended periods.
AVOID placing the transceiver in excessively dusty environments or in direct sunlight.
AVOID placing the transceiver against walls or putting
anything on top of the transceiver. This will obstruct heat
dissipation.
EXPLICIT DEFINITIONS
Place unit in a secure place to avoid inadvertent use by
children.
READ THIS INSTRUCTION MANUAL
CAREFULLY before attempting to operate the
During mobile operation, DO NOT operate the transceiver
without running the vehicle’s engine. When transceiver
power is ON and your vehicle’s engine is OFF, the vehicle’s battery will soon become exhausted.
transceiver.
SAVE THIS INSTRUCTION MANUAL. This
manual contains important safety and operating instructions for the IC-746PRO.
EXPLICIT DEFINITIONS
WORD
DEFINITION
Personal injury, fire hazard or electric
R WARNING
shock may occur.
CAUTION
NOTE
Radio Frequency (RF) energy. Extreme caution should be
observed when operating this device. If you have any
questions regarding RF exposure and safety standards
please refer to the Federal Communications Commission
Office of Engineering and Technology’s report on Evaluating Compliance with FCC Guidelines for Human Radio
frequency Electromagnetic Fields (OET Bulletin 65).
Equipment damage may occur.
If disregarded, inconvenience only. No
risk or personal injury, fire or electric
shock.
Make sure the transceiver power is OFF before starting
the vehicle. This will avoid possible damage to the transceiver by ignition voltage spikes.
During maritime mobile operation, keep the transceiver
and microphone as far away as possible from the magnetic
navigation compass to prevent erroneous indications.
BE CAREFUL! The heatsink will become hot when operating the transceiver continuously for long periods.
BE CAREFUL! If a linear amplifier is connected, set the
transceiver’s RF output power to less than the linear amplifier’s maximum input level, otherwise, the linear amplifier will be damaged.
Use Icom microphones only (supplied or optional). Other
manufacturer’s microphones have different pin assignments, and connection to the IC-746PRO may damage
the transceiver.
TABLE OF CONTENTS
FOREWORD ........................................ i
IMPORTANT ........................................ i
EXPLICIT DEFINITIONS ..................... i
PRECAUTIONS ................................... i
TABLE OF CONTENTS ...................... ii
■ Electronic keyer functions ............ 29
■ Operating RTTY (FSK) ................. 35
■ RTTY functions ............................. 36
■ Operating AM ............................... 40
■ Operating FM ............................... 41
■ Repeater operation ....................... 44
QUICK REFERENCE GUIDE ........ I – X
5 FUNCTIONS FOR RECEIVE
........................................... 47 – 54
■ Installation ....................................... I
■ Operation ....................................... III
■ Your first contact ........................... IV
■ Ready to call CQ? ......................... IX
1 PANEL DESCRIPTION ........... 1 – 12
■ Front panel ..................................... 1
■ Rear panel ...................................... 7
■ LCD display .................................... 9
■ Multi function switches .................. 11
■ Microphone (HM-36) .................... 12
2 INSTALLATION AND
CONNECTIONS ................... 13 – 17
■ Unpacking .................................... 13
■ Selecting a location ...................... 13
■ Grounding ..................................... 13
■ Antenna connection ...................... 13
■ Required connections ................... 14
■ Advanced connections ................. 15
■ Power supply connections ............ 16
■ Linear amplifier connections ......... 17
■ External antenna tuner
connection .................................... 17
3 BASIC OPERATION ............. 18 – 25
■ When first applying power
(CPU resetting) ............................. 18
■ Initial settings ................................ 18
■ Selecting an operating band ........ 19
■ Selecting VFO/memory mode ...... 20
■ VFO operation .............................. 20
■ Frequency setting ......................... 21
■ Operating mode selection ............ 23
■ Volume setting .............................. 23
■ Squelch and receive (RF)
sensitivity ...................................... 24
■ Basic transmit operation ............... 25
4 RECEIVE AND TRANSMIT .. 26 – 46
■ Operating SSB ............................. 26
■ Operating CW ............................... 27
■ Simple band scope ....................... 47
■ Preamp/Attenuator ....................... 48
■ RIT function .................................. 48
■ AGC function ................................ 49
■ IF filter selection ........................... 50
■ IF (DSP) filter shape ..................... 51
■ Noise blanker ............................... 51
■ Meter peak hold function .............. 51
■ Twin PBT operation ...................... 52
■ Noise reduction ............................ 53
■ Notch function .............................. 53
■ Dial lock function .......................... 53
■ Voice squelch control function ...... 54
6 FUNCTIONS FOR TRANSMIT
........................................... 55 – 61
■ VOX function ................................ 55
■ Break-in function .......................... 56
■ ∂TX function ................................ 57
■ Monitor function ............................ 57
■ Speech compressor ..................... 58
■ Transmit filter width selection ....... 58
■ Split frequency operation .............. 59
■ Quick split function ....................... 60
■ Measuring SWR ........................... 61
7 MEMORY OPERATION ........ 62 – 68
■ Memory channels ......................... 62
■ Memory channel selection ............ 62
■ Programming a memory ............... 63
■ Memory clearing ........................... 63
■ Selecting the call channel ............. 64
■ Programming the call channel ...... 64
■ Frequency transferring ................. 65
■ Programming scan edges ............ 66
■ Assigning memory names ............ 67
■ Memo pads ................................... 68
■ Voice Squelch control function ..... 70
■ Scan set mode ............................. 70
■ Programmed scan/Fine programmed
scan .............................................. 71
■ Memory scan operation ................ 72
■ Select memory scan ..................... 72
■ ∂F scan operation and Fine ∂F scan
...................................................... 73
■ Tone scan/DTCS code scan
operation ...................................... 74
9 ANTENNA TUNER OPERATION
............................................ 75–77
■ Antenna connection and selection 75
■ Antenna tuner operation ............... 76
■ Optional external tuner operation . 77
10 DATA COMMUNICATION ..... 78 – 80
■ Connections ................................. 78
■ Packet (AFSK) operation .............. 79
■ Adjusting the TNC output level ..... 80
■ Data transmission speed .............. 80
11 SET MODE ............................ 81–89
■ General set mode ......................... 81
■ Tone control set mode .................. 89
12 OPTION INSTALLATION ..... 90 – 91
■ Opening the transceiver’s case .... 90
■ UT-102 VOICE SYNTHESIZER UNIT ... 90
■ CR-338 HIGH STABILITY CRYSTAL UNIT
..................................................... 91
13 MAINTENANCE .................... 92–94
■ Trouble shooting ........................... 92
■ Fuse replacement ......................... 93
■ Tuning dial brake adjustment ....... 93
■ Resetting the CPU ........................ 94
■ Frequency calibration (approximate)
..................................................... 94
14 CONTROL COMMAND ......... 95–99
■ Remote jack (CI-V) information .... 95
15 SPECIFICATIONS ...................... 100
16 OPTIONS.................................... 101
8 SCANS ................................. 69 – 74
■ Scan types .................................... 69
■ Preparation ................................... 69
SUPPLIED ACCESSORIES
The transceiver comes with the following accessories.
Qty.
q DC power cable (OPC-025D) ............................ 1
w Hand microphone (HM-36) ................................ 1
e Spare fuses (FGB 30 A) .................................... 2
r Spare fuse (FGB 5 A) ........................................ 1
t CW keyer plug (AP-330) .................................... 1
Icom, Icom Inc. and the
are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom, Germany, France, Spain, Russia and/or other countries.
ii
QUICK REFERENCE GUIDE
■ Installation
1. Install a ground system for DC noise suppression
and RFI suppression
2. Install your DC power supply
3. Install lightning protection. This will help protect
more than your gear.
4. Install and connect an antenna system for the appropriate bands of operation
5. Connect other peripheral equipment. This includes
microphones, headsets, TNC, amplifiers and any
other equipment necessary to make your shack
complete.
1. Grounding your Shack
Although your radio will operate by connecting the DC
power supply and antenna, it is necessary to have a
good ground system in your shack. A ground connection is the electrical contact between the common
point of an electrical or electronic system and the
earth.
A good earth ground is necessary to prevent electrical
shock, eliminate problems from RFI and DC noise.
With more electronic devices being used today, it is
also important to reduce RFI and EMI. Although you
may not see interference in your shack, without a
grounding system, your neighbors may experience interference. Even though many of these devices are
part 15, where they must accept interference from
their surrounding environment, it is best to eliminate
as much of the possible interference from your shack.
If you do not have a grounding system for your shack,
depending on the location of your shack, basement or
ground floor, a good ground system can be as simple
as a couple of ground rods driven 6 to 8 feet into the
soil. When installing your IC-746PRO to your grounding system, the shortest most direct connection is recommended.
NOTE: There are many publications covering
proper grounding techniques. Check with your local
dealer for more information and recommendations.
D Some Symptoms if inadequate grounding
a. Poor DC Ground
60 Hz hum on the audio either Rx or Tx without the
antenna connected.
If you feel a tingling sensation when you touch a
metal surface. Surfaces such as the cover of your
radio or power supply.
b. Poor RF Ground
While transmitting and you feel a tingling sensation
when you touch a metal surface. Surfaces such as
the cover of your radio or power supply.
While transmitting, you experience interference to
other electronic devices, such as the telephone,
television or stereo audio systems.
2. Installing your DC Power Supply
The DC power supply is a device used to convert
110/220 V AC, also know as Household current, to a
steady source of 12 V DC.
The perfect match to your IC-746PRO is the PS-125.
This compact switching power supply is the matching
power supply for your IC-746PRO with a current rating of 25 A continuous duty. This plug and play unit;
plugs into the DC jack located on the rear of the radio.
PS-125
DC power
socket
Transceiver
• If you are not using the PS-125:
Connect the supplied DC power cable (OPC-025D) to
the appropriate color coded terminals, then insert the
DC connector into the DC jack located on the rear of
the radio.
AC A DC power
outlet
supply*
Transceiver
Black Red
_ +
AC cable
DC power cable
Connect to an AC outlet using the supplied AC cable.
to DC power
socket
30 A fuses
Supplied
DC power cable *13.8 V; at least 23 A
NOTE: Although the power supply current requirement is quite low during receiving, this not the case
when you transmit. With many electrical devices in
the shack, it is very important to verify the electrical
circuit is not overloaded.
QUICK REFERENCE GUIDE
3. Installing lightning protection
Although you may not live in an area with high occurrence for lightning storms, it is always wise to take
precautions for lightning or static discharges. Proper
lightning protection not only offers protection to the
ham gear, but the shack and most importantly the operator.
NOTE: There are many publications covering
proper lightning protection, check with your local
dealer for more information and recommendations.
4. Installing your antenna system
Whether your IC-746PRO is your first radio or one of
many, one of your key elements in a great shack is
the antenna system. There are three connections on
the back of your IC-746PRO, two for HF and 6 m and
one for 2 m. If you are using one antenna for HF and
6 m, for simplicity, connect the antenna coax to ANT 1.
ANTENNA 1, 2
[Example]: ANT1 for 1.8–18 MHz bands
ANT2 for 21–50 MHz bands
Antenna SWR
Each antenna is tuned for a specified frequency
range and SWR may be increased out-of-range.
When the SWR is higher than approx. 2.0:1, the
transceiver’s power drops to protect the final transistor. In this case, an antenna tuner is useful to
match the transceiver and antenna. Low SWR allows full power for transmitting even when using the
antenna tuner. The IC-746PRO has an SWR meter
to monitor the antenna SWR continuously.
PL-259 CONNECTOR INSTALLATION EXAMPLE
30 mm
Coupling ring
10 mm (soft solder)
10 mm
Soft
solder
1–2 mm
Slide the coupling ring
down. Strip the cable
jacket and soft solder.
Strip the cable as
shown at left. Soft solder the center conductor.
solder solder
Slide the connector
body on and solder it.
144 MHz ANTENNA
Connect a VHF (60–144 MHz)
antenna; impedance: 50 Ω.
Your IC-746PRO is equipped with an internal antenna
tuner (ATU) for operation on 160–6 m. This ATU is designed to work with an unbalanced 50 Ω feedline. The
purpose of the internal antenna tuner is match the impedance of your antenna system to as close to a
50 Ω load as possible. This ATU will not operate with
a long wire or ladder line (450 Ω or balanced feedlines). An external ATU such as the AH-4 would be
necessary for this kind of operation.
Screw the coupling
ring
onto
the
connector body.
30 mm ≈ 9⁄8 in 10 mm ≈ 3⁄8 in 1–2 mm ≈ 1⁄16 in
R WARNING: Although a mag mount antenna
works great on a vehicle, DO NOT use with IC746PRO on this type of antenna.
CAUTION: Although your IC-746PRO has protection to drop down power with a high SWR, this
does not completely protect the transceiver from
transmission without an antenna. Make sure you
have an antenna connect whenever you transmit
with your radio.
NOTE: There are many publications covering
proper antennas and their installation, check with
your local dealer for more information and recommendations.
II
QUICK REFERENCE GUIDE
5. Connect other peripheral equipment
Everyone has his or her favorite ad-on gear; now is
the time to connect this gear! We will cover the basic
devices that can be connected to your IC-746PRO.
If you do not see the particular item you are wanting
to connect, refer to the Advance Connections section
starting on page 15.
■ Operation
1. Voice
Microphones: Connect it to the eight-pin connector on
the front of the radio.
MICROPHONES
HM-36
SM-20
2. CW
CW Key: There are several types of keys or keyers
that can be used with your IC-746PRO.
a. Lambic Key paddle: Use a 6.35(d) mm (1⁄4″)
stereo plug and connect to the [ELEC-KEY] jack located on the front of the radio.
CW KEY
STRAIGHT KEY
(dot)
(com)
(dash)
A straight key can be used when the internal
electronic keyer is turned OFF in keyer set
mode. (p.34)
III
b. Straight Key: Use a 6.35(d) mm (1⁄4″) mono plug
and connect key to the back of the radio.
c. External Keyer: Use a 6.35(d) mm (1⁄4″) mono
plug and connect to the back of the radio.
d. Computer Keying: Use a 6.35(d) mm (1⁄4″) mono
plug and connect to the back of the radio.
(+)
(_)
NOTE: You will need to select the type of keyer you
are using in the Keyer Set mode. There are many
advanced CW functions in this set mode, until you
have a full understanding of these functions
change only the items necessary.
QUICK REFERENCE GUIDE
3. Other convenient items
Headphones:
A 6.35(d) mm (1⁄4″) mono jack for operation without
using the internal or external speakers. Perfect for operation without disturbing others in the room.
HEADPHONES
External Speaker:
A 3.5(d) mm (1⁄8″) mono jack for operation with an external speaker. (Input impedance: 8 Ω/Max. input
power: 5 W)
EXTERNAL SPEAKER
SP-21 (optional)
■ Your first contact
Now you should have your IC-746PRO installed in
your shack, and like a kid on his birthday, you are
probably excited to get on the air. We would like to
take you through a few basic operation steps to make
your first “On The Air” an enjoyable experience.
D Turning on the radio
1. Before powering up your radio, you may want to
make sure the following controls are set in the following positions:
2. Resetting the CPU: Although you have purchased
a brand new radio, some settings may be changed
from the factory defaults from the CQ process. So
your radio can start from Factory Defaults resetting
the CPU is necessary.
[POWER]
[F-INP] [M-CL]
• [AF]
: Commonly referred to as the volume: fully CCW.
• [NR]
: The noise reduction control: fully
CCW.
• [MIC GAIN]
: The mic gain: fully CCW.
• [RF/SQL]
: The control for the RF Gain and
Squelch circuits: 12 o’clock.
• [CW PITCH] : The control for the CW pitch:
12 o’clock.
• [KEY SPEED] : Internal CW Keyer Speed: fully
CCW
• [NOTCH]
: Control for the manual notch:
12 o’clock
IV
QUICK REFERENCE GUIDE
D Just listening
1. Select the desired band
Your IC-746PRO easy way of changing bands using
the keypad located just above the tuning knob on the
right hand side of the display. You will notice each
switch has two sets of numbers; one set of numbers
represents the band selection.
• Say you want to go to 20 meters or 14 MHz; you
would push the [14 5]. This will immediately change
the displayed operating frequency to the 20-meter
band. This system is the triple band stacking registers. For more details on this system refer to p. 19.
1.8 1
3.5 2
10 4
14 5
18 6
21 7
24 8
28 9
GENE
50 0
144 ENT
2. Tune to the desired frequency
Directly below the keypad is the tuning knob. This will
allow you to dial in the frequency you want to operate. You will notice the tuning speed [TS] is 10 Hz resolutions. Page 22 will instruct you on how to set the
tuning speed [TS] for 1 Hz resolution.
NOTE: Although you can directly enter the frequency with the keypad, using the Band Stacking
Registers and the tuning knob is the most popular
method of hoping around the bands. For more information regarding the direct frequency entry
method, refer to p. 22.
3. Verify proper antenna has been selected.
You IC-746PRO has three antenna connectors. Two
for HF and 6m and a one for 2m. The selection for 2m
is automatic, where the HF and 6m is user selectable
for either one of the antenna jacks. For the first time
use, the antenna selector should show “
” on the
display of your radio. Verify the antenna selected on
the display is the antenna port your connected your
antenna.
Either “1” or “2” appears.
*No indicator appear during
144 MHz operation.
4. Adjust audio output
Adjust this control to a comfortable audio level.
AF
RF/SQL
Decreases
Increases
No audio output
Max. audio output
QUICK REFERENCE GUIDE
D What are you hearing?
Stop and focus on what you are hearing. Do you hear
a lot of noise? Is the signal intelligible? Are you set up
for the right mode? How about the filters?
1. Verify mode
Although your IC-746PRO will automatically select
USB or LSB in the HF bands, it will not select any of
the other modes. You will need to select the proper
mode whether CW, RTTY, AM or FM.
SSB
CW/RTTY
AM/FM
Hint!
The Triple Band Stacking Registers will memorize
the last three frequencies used in the band, as well
as the Mode, Filter, Tuner and AGC settings. Making band hoping much easier.
2. Reducing interference
Your IC-746PRO has many features to reduce QRM
and QRN from the desired signal.
a. Noise Reduction: The noise reduction system on
your IC-746PRO is part of the 32-bit DSP. This is
used to reduce the hiss and QRM levels. To activate, push the [NR] switch located just to the right
of the [PHONES] jack.
NR
NOTCH
Decreases
Increases
OFF
Noise reduction ON
Noise reduction OFF
[NR]
[NR]
AGC
DUP
CMP
TBW
SCP
Appears
Hint!
How much [NR] will depend on the S/N ratio, Signal
to Noise. Just using the [NR] may cause the signal
to become distorted. To keep this from happening,
using the [NR] along with the [RF GAIN] and Filter
bandwidths will allow you to zero in on the desired
signal with as little QRM as possible.
b. Adjusting the Noise Reduction: The noise reduction is completely variable on how much of the
DSP Noise Reduction is used. Located just above
the [NR] switch, this is where the [NR] level control.
VI
QUICK REFERENCE GUIDE
c. Notch: There are two notch systems on your IC746PRO.
• Automatic: The automatic notch will track up to three
heterodynes. This is great for eliminating heterodynes on 80 and 160 meters, and those annoying
tune up signals across the band. Once selected an
icon will appear “A NOTCH” on the display.
Hint!
The Automatic Notch will not operated in the SSB
data, CW or RTTY modes.
• Manual: The Manual notch provides 70 dB of attenuation to pin point an interfering signal. The 12 o’clock position is on the operating frequency, turning
the Notch knob clockwise moves the notch up the
band and counter clockwise will move the notch
down the band. Once selected an icon will appear
“NOTCH” on the display.
NR
NOTCH
Low freuency
High frequency
[A/NOTCH] [NOTCH]
AGC
DUP
CMP
TBW
SCP
Notch function indicators
NOTE: Your IC-746PRO is equipped with multiple
AGC circuits. This allows the DSP to filter out interfering signals and QRM, while also taking this interference out of the AGC. Bottom line, this will either eliminate or greatly reduce the pumping of the
AGC from the interfering signal.
d. Filters: Your IC-746PRO has an incredible IF DSP
based filter network with over 100 settings.
• Dial in your filters: By pushing [FILTER] for 1 sec.,
you enter the filter set mode. This is where you are
able set the three filter presets. Across the bottom of
the display you will see the “BW” icon. The switch directly below, along with the tuning dial, will be used
to select the changes you will make.
• Filter set mode indication
BW
Shows the selected filter and passband width.
• Indication while setting
BW
Reverses
[FILTER]
AGC
DUP
CMP
TBW
While pushing [F1 BW], rotate the tuning dial to set
passband width.
SCP
The selected filter width is indicated
for approx. 1 sec. when [FILTER] is
Filter selection
pushed.
VII
Appears
QUICK REFERENCE GUIDE
d. Filters:— continued
• On the fly adjustment: Once the adjustments have
been made in the filter set mode, you can make on
the fly changes by using the Twin Pass Band Tuning,
Twin PBT. You will be able to see the effects of the
Twin PBT on the upper left hand side of the screen.
PBT operation example
[TWIN PBT] control
[PBTC]
AGC
One of “1,” “2” or “3” is
displayed for selected filter
number indications.
DUP
CMP
TBW
SCP
Passband width and shifting value are
indicated while [TWIN PBT] is operated.
Appears when PBT is used.
NOTE: The Twin PBT filters shift the two IF DSP
filters (See Diagrams below and right). This feature
allows both an IF shift as well as a narrowing of the
Pass Band. Although you can narrow the pass
band by shifting the two filters, this does not narrow both filters, thus the filter shape is not narrowed. You may hear some signal artifacts pass
through this filter adjustment.
• Filter set mode indication
BW
Shows the selected filter and passband width.
• Indication while PBT setting
BW
Appears when passband is shifted.
*Pushing [PBTC] for 1 sec., the shifted value
return to default setting and the “dot” disappears.
Center
Passband
Passband
IF shift
pass band
IF center frequency
interference
desired signal inteference desired signal
IF center freq. interference
VIII
QUICK REFERENCE GUIDE
3. RX Tone Control:
[F1 ≤] [F2 ≥] [F4 TCN]
Once you have mastered your filter settings, one last
feature to enable the most intelligible audio is the actual audio tone you hear. You can adjust the equalization of your received audio ±5dB.
q Push [MENU] several time, or until M2 is shown on
the display.
w Push [F4 TCN] for the Tone Control set mode.
e Push the appropriate mode switch to adjust SSB,
AM or FM.
r Push [F1 ≤] or [F2 ≥] to change to the desired
component.
[MENU]
Tuning dial
1. RX Bass
This item adjusts the bass level of the receive audio
tone from –5 dB to +5 dB in 1 dB steps.
RX
Bass
SSB
RX
Treble
SSB
2. RX Treble
This item adjusts the treble level of the receive audio
tone from –5 dB to +5 dB in 1 dB steps.
We hope these pointers have been helpful. Now you
are ready for the “Ready to call CQ?”.
■ Ready to call CQ?
[NR]: Max. CCW
[NOTCH]: Max. CCW
i746PRO
TUNER
TWIN PBT
HF/VHF TRANSCEIVER
ANT
1.8 1
3.5 2
10 4
14 5
18 6
21 7
24 8
28 9
SPLIT
GENE
50 0
144 ENT
A /B
POWER
F-INP
NR
NOTCH
TRANSMIT
[TRANSMIT]: OFF
PBTC
MW
V/M
PHONES
MP-W
NR
ELEC-KEY
AF
TS
MP-R
TX
A/NOTCH
XFC
RX
LOCK
RF/SQL
RIT
[AF]: Max. CCW
∂TX
CLEAR
RIT/∂TX
MIC
[RF/SQL]: 12 o’clock
F1
F2
F3
F4
F5
MENU
SSB
CW/RTTY
AM/FM
FILTER
[MIC GAIN]: Max. CCW
MIC GAIN
[RF PWR]: Max. CCW
M-CL
M-CH
RF PWR
CW PITCH
KEY SPEED
P.AMP/ATT
[CW PITCH]: 12 o’clock
NB
VOX/BK-IN
MONITOR
CALL
LOCK/
SPCH
[KEY SPEED]: Max. CCW
1. Setting up your transmit audio
The 32-bit DSP in your IC-746PRO is capable of giving
you the type of transmit audio for your SSB Operation.
2. Mic Gain
The microphone gain is used for proper transmit
audio level for full output power. Although the hand
microphone supplied with your IC-746PRO should reIX
quire a setting of the [MIC GAIN] you should find a
10–11 o’clock position.
QUICK REFERENCE GUIDE
3. DSP TX Audio Pass Band
The capable of changing the pass band of your transmit audio, is at your finger tip. Regardless of the condition of the speech compressor, you can adjust by
selecting the [F4 TBW].
You will find this located on the M1 menu. Pushing the
[F4 TBW] for 1 sec. you can step through the TX
audio band pass.
There are three levels of audio passband available
(Wide, Mid, and Nar).
TX Audio Passband widths
Wide
: 2.9 kHz
; Great Full Audio
Mid
: 2.6 kHz
; Great for operators with
deep full voices
Nar
: 2.0 kHz
; Great for breaking through
pile ups
AGC
DUP
CMP
TBW
SCP
F1
F2
F3
F4
F5
Push [F4]
AGC
F1
TX BW=WIDE
DUP CMP TBW
F2
F3
SCP
F4
F5
The selected transmit filter width
is displayed for approx. 1 sec.
Push [F4] for 1 sec. to select the transmit filter width.
4. Microphone Equalizer
Although these bandwidths are fixed, the Microphone
Tone Control will give you more audio control for your
Voice operation on SSB, AM, and FM modes. Your
IC-746PRO is equipped with a very powerful equalizer system with 121 possible combinations. This is
achieved by using the separate bass and treble adjustments. The default for both the Base and Treble
is at 0 dB.
[F1 ≤] [F2 ≥] [F4 TCN]
Entering Microphone Tone Control set mode:
q Push [MENU] several time, or until M2 is shown on
the display.
w Push [F4 TCN] for the Tone Control set mode.
e Push the appropriate mode switch to adjust SSB,
AM, or FM.
r Push [F1 ≤] or [F2 ≥] to change to the desired
component.
1. TX Bass
This item adjusts the bass level of the transmit audio
tone from –5 dB to +5 dB in 1 dB steps.
[MENU]
Tuning dial
Hint!
Voice patterns and audio characteristics vary with
each operator, therefore the [MIC GAIN], DSP TX
Audio Pass Band and Microphone Tone Control
settings will be different for each operator. Actual on
air experimenting is necessary to get the just right
sound.
TX
Bass
SSB
TX
Treble
SSB
2. TX Treble
This item adjusts the treble level of the transmit audio
tone from –5 dB to +5 dB in 1 dB steps.
Verify you have selected a clear frequency
and call out your CQ!
1
PANEL DESCRIPTION
■ Front panel
!7 !6 !5 !4 !3 !2
i746PRO
TUNER
1.8 1
3.5 2
10 4
14 5
18 6
21 7
24 8
28 9
SPLIT
GENE
50 0
144 ENT
A /B
F-INP
NR
HF/VHF TRANSCEIVER
ANT
POWER
NOTCH
TRANSMIT
PHONES
MP-W
NR
ELEC-KEY
AF
TX
A/NOTCH
TS
MP-R
RX
LOCK
XFC
RF/SQL
MIC
MIC GAIN
RF PWR
y u io
F1
F2
F3
F4
F5
MENU
SSB
CW/RTTY
AM/FM
FILTER
CW PITCH
KEY SPEED
!0
!1
q POWER SWITCH [POWER]
➥ Push momentarily to turn power ON.
• Turn the optional DC power supply ON in advance.
➥ Push for 1 sec. to turn power OFF.
w TRANSMIT SWITCH [TRANSMIT]
Selects transmitting or receiving.
• The [TX] indicator lights red while transmitting and the
[RX] indicator lights green when the squelch is open.
e HEADPHONE JACK [PHONES]
Accepts headphones.
• Output power: 5 mW with an 8 Ω load.
• When headphones are connected, the internal speaker
or connected external speaker does not function.
r ELECTRONIC KEYER JACK [ELEC-KEY] (p. 14)
Accepts a paddle to activate the internal electronic
keyer for CW operation.
• Selection between the internal electronic keyer, bug-key
and straight key operation can be made in keyer set
mode. (p. 34)
• A straight key jack is separately available on the rear
panel. See [KEY] on p. 7.
• Keyer polarity (dot and dash) can be reversed in keyer
set mode. (p. 34)
• 4-channel memory keyer is available for your convenience. (p. 30)
(dot)
(com)
(dash)
P.AMP/ATT
NB
VOX/BK-IN
t MICROPHONE CONNECTOR [MIC]
Accepts the supplied or optional microphone.
• See p. 100 for appropriate microphones.
• See p. 12 for microphone connector information.
y RF GAIN CONTROL/SQUELCH CONTROL
[RF/SQL] (outer control)
Adjusts the RF gain and squelch threshold level.
The squelch removes noise output from the speaker
(closed condition) when no signal is received.
• The squelch is particularly effective for FM. It is also
available for other modes.
• 12 to 1 o’clock position is recommended for any setting
of the [RF/SQL] control.
• The control can be set as ‘Auto’ (RF gain control in SSB,
CW and RTTY; squelch control in AM and FM) or
squelch control (RF gain is fixed at maximum) in set
mode as follows. (p. 81)
MODE
SSB, CW
RTTY
AM, FM
AUTO
SET MODE SETTING
SQL
RF GAIN + SQL
RF GAIN
SQL
RF GAIN + SQL
SQL
SQL
RF GAIN + SQL
• When setting as RF gain/squelch control
Noise squelch (FM mode)
Squelch is
open.
Recommended level
Maximum
RF gain
RF gain
adjustable
range
LOCK/
SPCH
CALL
MONITOR
S-meter
squelch
PANEL DESCRIPTION
• When functioning as RF gain control
(Squelch is fixed open; SSB, CW, RTTY only)
Maximum
RF gain
Adjustable
range
!0 CW PITCH CONTROL [CW PITCH] (p. 28)
Shifts the received CW audio pitch and monitored
CW audio pitch without changing the operating frequency.
• The pitch can be changed from 300 to 900 Hz in approx.
25 Hz steps.
Decreases
Increases
CW PITCH
Minimum RF gain
• When functioning as squelch control
(RF gain is fixed at maximum.)
Noise squelch
threshold
(FM mode)
Noise squelch (FM mode)
!1 ELECTRONIC CW KEYER SPEED CONTROL
[KEY SPEED] (p. 28)
Adjusts the internal electronic CW keyer’s speed.
• 6 wpm (min.) to 60 wpm (max.) can be set.
Slow
S-meter squelch
threshold
S-meter
squelch
Squelch is
open.
Shallow
Deep
While rotating the RF gain control, noise may be
heard. This comes from the DSP unit and does not
indicate an equipment malfunction.
KEY SPEED
!2 AUTO NOTCH/MANUAL NOTCH SWITCH
[A/NOTCH] (p. 53)
Toggles the notch function between manual and automatic when pushed.
• “NOTCH” appears when manual; “A NOTCH” appears
when automatic notch is selected.
!3 NOTCH CONTROL [NOTCH] (outer control; p. 53)
Adjusts the notch filter frequency to remove a interference signal.
u MIC GAIN CONTROL [MIC GAIN]
Adjusts microphone input gain.
• The transmit audio tone in SSB, AM and FM modes can
be adjusted in tone control set mode. (p. 88)
Fast
NR
NOTCH
Low freuency
High frequency
✔ How to set the microphone gain.
Set the [MIC] control so that the ALC meter sometimes
swings during normal voice transmission in SSB mode.
Recommended level for
an Icom microphone
Decreases
Increases
MIC GAIN
i AF CONTROL [AF] (inner control)
Varies the audio output level from the speaker.
AF
!4 ANTENNA SELECTOR SWITCH [ANT] (p. 75)
Switches the antenna connector selection between
ANT1 and ANT2 when pushed.
!5 NOISE REDUCTION LEVEL CONTROL [NR]
(inner control; p. 53)
Adjusts the noise reduction level when the noise reduction is in use. Set for maximum readability.
NR
Decreases
NOTCH
Increases
RF/SQL
Decreases
Increases
No audio output
Max. audio output
o RF POWER CONTROL [RF PWR]
Continuously varies the RF output power from minimum (less than 5 W*) to maximum (100 W*).
* AM mode: less than 5 W to 40 W
Decreases
Increases
RF PWR
OFF
!6 ANTENNA TUNER SWITCH [TUNER] (pgs. 76,
77)
➥ Turns the antenna tuner ON and OFF (bypass)
when pushed momentarily.
➥ Starts to tune the antenna manually when
pushed for 1 sec.
• When the tuner cannot tune the antenna, the tuning
circuit is bypassed automatically after 20 sec.
!7 NOISE REDUCTION SWITCH [NR] (p. 53)
Switches the noise reduction ON and OFF.
• “NR” appears while the noise reduction is activated.
1
PANEL DESCRIPTION
■ Front panel (continued)
i746PRO
TUNER
TWIN PBT
HF/VHF TRANSCEIVER
ANT
1.8 1
3.5 2
10 4
14 5
18 6
21 7
24 8
28 9
F-INP
NR
NOTCH
SPLIT
PBTC
50 0
GENE
144 ENT
MW
A /B
V/M
MP-W
TX
A/NOTCH
NR
AF
M-CL
M-CH
TS
MP-R
RX
#3
LOCK
XFC
RF/SQL
∂TX
RIT
RIT/∂TX
MIC GAIN
RF PWR
F1
F2
F3
F4
F5
MENU
SSB
CW/RTTY
AM/FM
FILTER
CW PITCH
!8
KEY SPEED
!9 @0
P.AMP/ATT
NB
VOX/BK-IN
MONITOR
@1
@2
@3
@4
!8 MULTI-FUNCTION SWITCHES [F1]–[F5]
➥Push to select the function indicated in the LCD
display above these switches. (p. 11)
• Functions vary depending on the operating condition.
➥Push to input a character for memory keyer programming or memory name. (pgs. 31, 66)
!9 MENU SWITCH [MENU]
Push to change the set of functions assigned to the
multi-function switches.
• Toggles between menu 1 (M1) and menu 2 (M2).
@0 MODE SWITCHES
Selects the desired mode. (p. 23)
• Announces the selected mode when an optional UT-102
is installed. (p. 89)
SSB
CW/RTTY
AM/FM
CLEAR
#2
#1
#0
LOCK/
SPCH
CALL
@5 @6
#7
#6
#5
#4
@7
@8
@9
@1 PREAMP/ATTENUATOR SWITCH [P.AMP/ATT]
(p. 48)
➥ Push momentarily to toggle between preamp-1
and preamp-2.
• “P.AMP1” activates for HF all bands.
• “P.AMP2” activates high-gain preamp for 24 MHz
band and above.
➥ Push for 1 sec. to toggle the attenuator function
ON and OFF.
✔ What is the preamp?
The preamp amplifies received signals in the front end circuit to improve the S/N ratio and sensitivity. Select “P.AMP1”
or “P.AMP2” when receiving weak signals.
✔ What is the attenuator?
➥ Selects USB and LSB mode alternately.
➥ Selects SSB data mode (USB-D, LSB-D)
when pushed for 1 sec. in SSB mode.
The attenuator prevents a desired signal from distorting
when very strong signals are near the desired frequency, or
when very strong electric fields, such as from a broadcasting station, are near your location.
➥ Selects CW and RTTY mode alternately.
➥ Switches CW and CW-R (CW reverse)
mode when pushed for 1 sec. in CW
mode.
➥ Switches RTTY and RTTY-R (RTTY reverse) mode when pushed for 1 sec. in
RTTY mode.
@2 NOISE BLANKER SWITCH [NB] (p. 51)
➥ Switches the noise blanker ON and OFF when
pushed. The noise blanker reduces pulse-type
noise such as that generated by automobile ignition systems. This function cannot be used for
FM, or non-pulse-type noise.
➥ Selects AM and FM mode alternately.
➥ Selects AM/FM data mode (AM-D, FM-D)
when pushed for 1 sec. AM/FM mode.
➥ Enters the noise blanker level set mode when
pushed for 1 sec.
• “NB” appears while the noise blanker is activated.
PANEL DESCRIPTION
@3 VOX/BREAK-IN SWITCH [VOX/BK-IN]
➥ In SSB, AM and FM modes, push momentarily to
turn the VOX function ON and OFF (p. 54); push
for 1 sec. to enter VOX set mode (p. 54).
➥ In CW mode, push momentarily to turn the semi
break-in, full break-in or break-in OFF (p. 56);
push for 1 sec. to enter break-in set mode (p. 56).
✔ What is the VOX function?
The VOX function (voice operated transmission) starts transmission without pushing the transmit switch or PTT switch
when you speak into the microphone; then, automatically returns to receive when you stop speaking.
✔ What is the break-in function?
The break-in function switches transmit and receive with CW
keying. Full break-in (QSK) can monitor the receive signal
during keying.
@4 MONITOR SWITCH [MONITOR] (p. 57)
➥ Monitors your transmitted signal.
➥ Enters to monitor set mode when pushed for
1 sec.
@5 FILTER SWITCH [FILTER] (p. 50)
➥ Selects one of 3 IF filter settings.
➥ Enters the filter set mode when pushed for 1 sec.
@6 CALL SWITCH [CALL] (p. 64)
Selects the call channel when pushed momentarily.
@7 TUNING DIAL (p. 21)
Changes the displayed frequency, selects set mode
items, etc.
@8 LOCK/SPEECH SWITCH [LOCK/SPCH]
➥ Push momentarily to toggle the dial lock function
ON and OFF. (p. 53)
➥ Pushing for 1 sec. announces the selected readout frequency and S-meter indication when an
optional UT-102 is installed. (p. 89)
@9 RIT/∂TX CONTROL [RIT/∂TX] (pgs. 48, 56)
Shifts the receive and/or transmit frequency without
changing the transmit and/or receive frequency
while the RIT and/or ∂TX functions are ON.
• Rotate the control clockwise to increase the frequency,
or rotate the control counterclockwise to decrease the
frequency.
• The shift frequency range is ±9.99 kHz in 10 Hz steps
(or ±9.999 kHz in 1 Hz steps).
RIT/∂TX
Low shift
High shift
#0 RIT SWITCH [RIT] (p. 48)
➥ Turns the RIT function ON and OFF when pushed.
• Use the [RIT/∂TX] control to vary the RIT frequency.
➥ Adds the RIT shift frequency to the operating frequency when pushed for 1 sec.
✔ What is the RIT function?
The RIT (Receiver Incremental Tuning) shifts the receive frequency without shifting the transmit frequency.
This is useful for fine tuning stations calling you on an off-frequency or when you prefer to listen to slightly differentsounding voice characteristics, etc.
#1 CLEAR SWITCH [CLEAR] (pgs. 48, 56)
Clears the RIT/∂TX shift frequency when pushed
for 1 sec.
#2 ∂TX SWITCH [∂TX] (p. 57)
➥ Turns the ∂TX function ON and OFF when
pushed.
• Use the [RIT/∂TX] control to vary the ∂TX frequency.
➥ Adds the ∂TX shift frequency to the operating
frequency when pushed for 1 sec.
✔ What is the ∂TX function?
The ∂TX shifts the transmit frequency without shifting the receive frequency. This is useful for simple split frequency operation in CW, etc.
#3 MEMORY CHANNEL SELECTOR [M-CH] (p. 62)
Select a memory channel.
• Rotate clockwise to increase the memory channel; rotate counterclockwise to decrease the memory channel.
#4 VFO/MEMORY SWITCH [VFO/MEMO]
➥ Switches the selected readout operating mode
between the VFO mode and memory mode when
pushed. (pgs. 20, 61)
➥ Transfers the memory contents to VFO when
pushed for 1 sec. (p. 65)
#5 MEMORY CLEAR SWITCH [M-CL] (p. 62)
Clears the selected readout memory channel contents when pushed for 1 sec. in memory mode.
• The channel becomes a blank channel.
• This switch does not function in VFO mode.
#6 MEMORY WRITE SWITCH [MW] (p. 63)
Stores the selected readout frequency and operating mode into the displayed memory channel when
pushed for 1 sec.
• This function is available both in VFO and memory
modes.
#7 PBT CLEAR SWITCH [PBTC] (p. 52)
Clears the PBT settings when pushed for 1 sec.
1
PANEL DESCRIPTION
■ Front panel (continued)
%1
%2
i746PRO
NER
%0 $9 $8
TWIN PBT
HF/VHF TRANSCEIVER
ANT
1.8 1
3.5 2
10 4
14 5
18 6
21 7
24 8
28 9
SPLIT
GENE
50 0
144 ENT
A /B
F-INP
NR
NOTCH
$7
PBTC
MW
V/M
MP-W
NR
AF
TX
A/NOTCH
XFC
M-CL
RX
LOCK
RF/SQL
RIT
∂TX
RIT/∂TX
MIC GAIN
RF PWR
F1
F2
F3
F4
F5
MENU
SSB
CW/RTTY
AM/FM
FILTER
CW PITCH
KEY SPEED
P.AMP/ATT
NB
VOX/BK-IN
MONITOR
CALL
#8 TRANSMIT FREQUENCY CHECK SWITCH [XFC]
(pgs. 45, 48)
Monitors the transmit frequency when pushed and
held.
• While pushing this switch, the transmit frequency can be
changed with the tuning dial, keypad or memo pad.
• When the split lock function is turned ON, pushing [XFC]
cancels the dial lock function. (p. 60)
$5
$4
M-CH
TS
MP-R
$6
CLEAR
$3
$2
$1
$0
#9
#8
LOCK/
SPCH
$4 QUICK TUNING SWITCH [TS] (p. 21)
➥ Turns the quick tuning step ON and OFF.
• While the quick tuning indicator is displayed, the frequency can be changed in programmed kHz steps.
• 0.1, 1, 5, 9, 10, 12.5, 20 and 25 kHz quick tuning
steps are available.
Quick tuning indicator
#9 MEMO PAD-WRITE SWITCH [MP-W] (p. 67)
Programs the selected readout frequency and operating mode into a memo pad.
• The 5 most recent entries remain in memo pads.
• The transmit frequency is programmed when pushed together with [XFC].
• The memo pad capacity can be expanded from 5 to 10
in set mode for your convenience. (p. 84)
$0 TRANSMIT INDICATOR [TX]
Lights red while transmitting.
$1 MEMO PAD-READ SWITCH [MP-R] (p. 67)
Each push calls up a frequency and operating
mode in a memo pad. The 5 (or 10) most recently
programmed frequencies and operating modes can
be recalled, starting from the most recent.
• The memo pad capacity can be expanded from 5 to 10
in set mode for your convenience. (p. 84)
$2 RECEIVE INDICATOR [RX]
Lights green while receiving a signal and when the
squelch is open.
$3 LOCK INDICATOR [LOCK] (p. 53)
Lights when the dial lock function is activated.
➥ While the quick tuning step is OFF, turns the 1 Hz
step ON and OFF when pushed for 1 sec.
• 1 Hz indication appears in and the frequency can be
changed in 1 Hz steps.
➥ While the quick tuning step is ON, enters the
quick tuning step set mode when pushed for
1 sec.
$5 VFO SELECT SWITCH [A/B] (p. 20)
➥ Push to toggle between VFO A and VFO B.
➥ Push for 1 sec. to equalize the frequency and operating mode of the two VFO’s.
PANEL DESCRIPTION
$6 SPLIT SWITCH [SPLIT]
➥ Turns the split function ON and OFF when
pushed.(p. 59)
➥ Turns the quick split function ON, when pushed
for 1 sec. (p. 60)
• The offset frequency is shifted from the displayed frequency.
• The quick split function can be turned OFF using set
mode. (p. 82)
➥ Turns the split function ON and sets the transmit
frequency after inputting an offset frequency with
the keypad (±4 MHz in 1 kHz steps; p. 59).
$7 PASSBAND TUNING CONTROLS [TWIN PBT]
Adjust the receiver’s “passband width” of the DSP
filter. (p. 52)
• Passband width and shift frequency are displayed in the
multi-function switch indicator.
• Push [PBTC] for 1 sec. to clear the settings when not in
use.
• Variable range is set to half of the IF filter passband
width. 25 Hz steps and 50 Hz steps are available.
• These controls function as an IF shift control while in AM
mode and when the RTTY filter is turned ON. Only the
inner control may function in this case.
%1 KEYPAD
➥ Pushing a key selects the operating band.
• [GENE] selects the general coverage band.
➥ Pushing the same key 2 or 3 times calls up other
stacked frequencies in the band. (p. 19)
• Icom’s triple band stacking register memorizes 3 frequencies in each band.
➥ After pushing [F-INP], enters a keyed frequency.
Pushing [144 ENT] is necessary at the end.
(p. 22)
• e.g. to enter 14.195 MHz, push [F-INP] [1] [4] [•] [1]
[9] [5] [144 ENT].
%2 LCD FUNCTION DISPLAY
(See pgs. 9, 10 for details.)
Shows the operating frequency, function switch
menus, band scope screen, memory name screen,
set mode settings, etc.
✔ What is the PBT control?
General PBT function electronically narrows the IF passband
width to reject interference. This transceiver uses the DSP
circuit for the PBT function.
TWIN PBT
PBT1
PBT2
TWIN PBT
TWIN PBT
TWIN PBT
–
Low cut
Center
High cut
$8 SPLIT INDICATOR (p. 59)
Lights during split operation.
$9 FREQUENCY INPUT SWITCH [F-INP] (p. 22)
Push to toggle keypad input between frequency and
band.
• The frequency input indicator lights during frequency input is selected for the keypad.
%0 FREQUENCY INPUT INDICATOR (p. 22)
Lights during frequency input from the keypad is
enable.
1
PANEL DESCRIPTION
■ Rear panel
!5
!4 !3
!2
q DC POWER SOCKET [DC 13.8V] (pgs. 14, 16)
Accepts 13.8 V DC through the supplied DC power
cable (OPC-025D).
Rear panel view
w ANTENNA CONNECTOR [ANT 144MHz]
e ANTENNA CONNECTOR 2 [ANT2]
r ANTENNA CONNECTOR 1 [ANT1]
(pgs. 14, 15, 17, 74)
Accept a 50 Ω antenna with a PL-259 connector.
• [ANT 144MHz] for 144 MHz band only; [ANT1]
When using an optional AH-4 HF/50 MHz AUTOMATIC ANTENNA TUNER , connect it to the [ANT1]
connector. The internal antenna tuner activates for
[ANT2] and deactivates for [ANT1] when connecting
the AH-4.
t DATA SOCKET [DATA] (pgs. 15, 77)
Connects a TNC (Terminal Node Controller), etc. for
data communications.
• See p. 8 for connector information.
y EXTERNAL SPEAKER JACK [EXT SP]
(pgs. 15, 100)
Accepts a 4–8 Ω speaker.
!0
u y t
o ALC INPUT JACK [ALC] (p. 17)
Connects to the ALC output jack of a non-Icom linear amplifier.
!0 ACCESSORY SOCKET 2 [ACC(2)]
!1 ACCESSORY SOCKET 1 [ACC(1)]
Enable connection of external equipment such as a
linear amplifier, an automatic antenna selector/
tuner, TNC for data communications, etc.
• See p. 8 for socket information.
!2 STRAIGHT KEY JACK [KEY] (p. 14)
Accepts a straight key or external electronic keyer
with 1⁄4 inch standard plug.
• [ELEC-KEY] on the front panel can be used for a straight
key or external electronic keyer. Deactivate the internal
electronic keyer in keyer set mode. (p. 34)
(+)
(_)
!3 TUNER CONTROL SOCKET [TUNER]
(pgs. 15, 76)
Accepts the control cable from an optional AH-4
HF/50 MHz AUTOMATIC ANTENNA TUNER .
If you use an external electronic keyer, make
sure the voltage retained by the keyer is less
than 0.4 V when the key is ON.
u CI-V REMOTE CONTROL JACK [REMOTE] (p. 94)
➥ Designed for use with a personal computer for remote control of transceiver functions.
➥ Used for transceive operation with another Icom
CI-V transceiver or receiver.
!4 CALIBRATION POT [CAL] (p. 93)
This is used for frequency calibration.
i SEND CONTROL JACK [SEND] (p. 17)
Goes to ground while transmitting to control external equipment such as a linear amplifier.
!5 GROUND TERMINAL [GND] (pgs. 13, 14)
Connect this terminal to a ground to prevent electrical shocks, TVI, BCI and other problems.
• Max. control level: 16 V DC/0.5 A
!1
• The transceiver has been adjusted and calibrated thoroughly at the factory. Under normal circumstances, the
frequency does not need to be re-calibrated.
PANEL DESCRIPTION
D DATA SOCKET
DATA
NAME
DATA IN
GND
Common ground for DATA IN, DATA OUT and AF OUT.
PTT P
PTT terminal for packet operation. Connect ground to transmit data.
PIN No.
DESCRIPTION
Input terminal for data transmit. (1200 bps: AFSK/9600 bps: G3RUH, GMSK)
DATA OUT Data out terminal for 9600 bps operation only.
AF OUT
Data out terminal for 1200 bps operation only.
Squelch out terminal. Becomes high (+8 V) when the transceiver receives a signal
which opens the squelch.
Rear panel view
P SQL
• To avoid unnecessary TNC transmission, connect squelch to the TNC to inhibit transmission when receiving signals.
• Keep audio output at a normal level, otherwise a “P SQL signal will not be output.
D ACC SOCKETS
ACC (1)
PIN No. NAME
RTTY Controls RTTY keying
GND Connects to ground.
Connected in parallel with ACC(2) pin 2.
Input/output pin. (HF/50 MHz only)
HSEND Goes to ground when transmitting.
When grounded, transmits.
AF
SQLS
13.8 V 13.8 V output when power is ON.
Rear panel view
ALC
PIN No. NAME
: More than 2.4 V
: Less than 0.6 V
: Less than 2 mA
Ground level
: –0.5 V to 0.8 V
Output current
: Less than 20 mA
Input current (Tx) : Less than 200 mA
Connected in parallel with ACC(2) pin 3.
Input impedance
Input level
MOD
Modulator input.
Connects to a modulator.
Rear panel view
ACC (2)
SPECIFICATIONS
“High” level
“Low” level
Output current
8 3
DESCRIPTION
: 10 kΩ
: Approx. 100 mV rms
AF detector output.
Output impedance : 4.7 kΩ
Fixed, regardless of [AF] position in
Output level
: 100–300 mV rms
default settings. (see notes below)
Squelch output.
Goes to ground when squelch opens.
SQL open
SQL closed
: Less than 0.3 V/5 mA
: More than 6.0 V/100 µA
Output current
: Max. 1 A
Connected in parallel with ACC(2) pin 7.
Control voltage
: –4 V to 0 V
Input impedance
: More than 10 kΩ
Connected in parallel with ACC(2) pin 5.
ALC voltage input.
DESCRIPTION
SPECIFICATIONS
Output voltage
Output current
8V
Regulated 8 V output.
GND
Same as ACC(1) pin 2.
HSEND
Same as ACC(1) pin 3.
BAND
ALC
Band voltage output.
(Varies with amateur band)
Output voltage
: 8 V ±0.3 V
: Less than 10 mA
: 0 to 8.0 V
Same as ACC (1) pin 8.
Input/output pin (144 MHz only)
VSEND Goes to ground when transmitting.
When grounded, transmits.
13.8 V
Ground level
Output current
Input current (Tx)
: –0.5 V to +0.8 V
: Less than 20 mA
: Less than 200 mA
Same as ACC(1) pin 7.
1
PANEL DESCRIPTION
■ LCD display
!4
!3
!2
!1
!0
q FREQUENCY READOUTS
Show the operating frequency.
w MULTI-FUNCTION METER INDICATION
➥ Shows receiving signal strength, etc. during receive.
➥ Shows transmit output power, ALC and SWR during transmit.
e VOX INDICATOR (p. 54)
Appears when the VOX function is activated.
r MICROPHONE COMPRESSOR INDICATOR (p. 58)
Appears when the microphone compressor is activated.
t MULTI-FUNCTION SWITCH INDICATOR (p. 11)
Indicates the functions assigned to the multi-function switches ([F1]–[F5]).
y DSP FILTER INDICATOR (p. 50)
Shows the selected IF filter.
u MEMORY CHANNEL READOUTS (p. 62)
Show the selected memory channel.
i SELECT MEMORY CHANNEL INDICATOR (p. 72)
Appears when the selected memory channel is set
as a select memory channel.
o BLANK MEMORY INDICATOR (p. 62)
Appears when the selected memory channel is
blank.
!0 1⁄4 TUNING DIAL SPEED INDICATOR (p. 21)
Appears when the tuning dial speed is set so that
one rotation is equal to 1⁄4 of the normal rotation.
!1 VOICE SQUELCH CONTROL INDICATOR (p. 54)
Appears during VSC (Voice Squelch Control) function is activated.
!2 MODE INDICATORs (p. 23)
Shows the selected operating mode.
• “D” appears when SSB data, AM data or FM data mode
is selected.
!3 ANTENNA INDICATOR (p. 75)
Indicate which antenna connector is use for
HF/50 MHz.
!4 ANTENNA TUNER INDICATORS (pgs. 75, 76)
➥ “TUNE” appears when the antenna tuner is ON;
“TUNE” appears and flashes during manual tuning.
➥ “EXT” appears when the optional AH-4 external
antenna tuner is connected to [ANT1].
PANEL DESCRIPTION
■ LCD display (continue)
@9
@8
@7
@6
@5
@4
!5
!6
!7
!8
!9
@0
!5 BREAK-IN INDICATORS (p. 56)
➥ “F BK-IN” appears when the full break-in function
is activated.
➥ “BK-IN” appears when the semi break-in function
is activated.
@3
@2
@1
@4 NOISE REDUCTION INDICATOR (p. 53)
Appears when the noise reduction is activated.
!6 MONITOR INDICATORS (p. 57)
Appears when the monitor function is activated.
@5 NOTCH INDICATORS (p. 53)
➥ “NOTCH” appears when the manual notch function is activated.
➥ “ANOTCH” appears when the automatic notch
function is activated.
!7 PREAMP INDICATORS (p. 48)
Appears when the preamp is activated.
@6 SPLIT INDICATOR (pgs. 58, 59)
Appears during split operation.
!8 ATTENUATOR INDICATORS (p. 48)
Appears when the attenuator is activated.
@7 MEMORY INDICATOR (p. 62)
Appears during memory mode.
!9 AGC INDICATORS (p. 49)
Shows the selected AGC time constant.
@8 VFO INDICATORS (p. 20)
Indicates whether VFO A or VFO B is selected.
• “F” for AGC fast; “M” for AGC middle; “S” for AGC
slow; “-OFF” for AGC OFF.
@0 NOISE BLANKER INDICATOR (p. 51)
Appears when the noise blanker is activated.
@9 RIT/∂TX INDICATORS (pgs. 48, 56)
Appears during RIT or ∂TX operation and indicate
the frequency offset.
@1 DTCS INDICATOR (p. 43)
Appears during DTCS operation.
@2 TONE SQUELCH INDICATORS
➥ “T” appears when the repeater tone is activated.
(p. 44)
➥ “TSQL” appears during tone squelch operation.
(p. 42)
@3 DUPLEX INDICATOR (p. 44)
“DUP–” or “DUP+” appears during repeater operation.
10
1
PANEL DESCRIPTION
■ Multi function switches
D M1 FUNCTIONS
1⁄4
During SSB operation
AGC
DUP
CMP
TBW
SCP
F1
F2
F3
F4
F5
DUP
1/4
F1
F2
F3
SCP
F4
• Bandwidth is selectable from narrow, middle
and wide.
F4
F5
During CW operation
AGC
DUP
1/4
KEY
SCP
F1
F2
F3
F4
F5
During RTTY operation
MEMORY KEYER MENU (p. 29)
Push to select the memory keyer or keyer
KEY
send menu, depending on the KEYER
F4
1st Menu setting in the set mode (p. 86).
RTTY MENU (p. 36)
Push to select the RTTY menu.
RTY
F4
AGC
DUP
1/4
RTY
SCP
F1
F2
F3
F4
F5
BAND SCOPE FUNCTION (p. 47)
Push to select the band scope screen.
SCP
F5
During AM operation
AGC
DUP
CMP
F1
F2
F3
SCP
F4
F5
During FM operation
AGC
DUP
CMP
TON
SCP
F1
F2
F3
F4
F5
AGC (p. 49)
AGC ➥ Push momentarily to changes the time
constant of the AGC circuit.
F1
➥ Push for 1 sec. to enter to the AGC set
mode.
DUPLEX (p. 44)
DUP ➥ Push momentarily to selects the duplex
direction or turn the function OFF.
F2
• “DUP–” or “DUP+” indicator appears during
duplex operation.
➥ Push for 1 sec. to turn the one-touch repeater function ON/OFF.
SPEECH COMPRESSOR (p. 58)
CMP ➥ Push momentarily to turn the speech
compressor function ON/OFF.
F3
• “COMP” indicator appears when the speech
compressor is ON.
➥ Push for 1 sec. to enter to the compressor set mode.
11
• “ ” indicator appears when the 1⁄4 function is
ON.
F3
TRANSMISSION BANDWIDTH (p. 58)
Push to select the transmission bandwidth.
TBW
During SSB data operation
AGC
FUNCTION (p. 21)
Push to turn the 1⁄4 function ON/OFF.
1/4
D M2 FUNCTIONS
SCN
MEM
SWR
TCN
VSC
F1
F2
F3
F4
F5
SCAN MENU (p. 70)
Push to select the scan menu.
SCN
F1
MEMORY NAME MENU (p. 67)
MEM Push to select the memory name screen.
F2
SWR GRAPH FUNCTION (p. 61)
Push to indicates the SWR graph screen.
SWR
F3
TONE CONTROL SET MODE (p. 88)
Push to enter the audio tone set mode.
TCN
F4
VSC FUNCTION (p. 54)
Push to turns the VSC (Voice Squelch
VSC
Control) function ON and OFF.
F5
PANEL DESCRIPTION
■ Microphone (HM-36)
q UP/DOWN SWITCHES [UP]/[DN]
Change the selected readout frequency or memory
channel.
w PTT SWITCH
Push and hold to transmit; release to receive.
• Continuous pushing changes the frequency or memory
channel number continuously.
• While pushing [XFC], the transmit readout frequency can
be controlled while in spilt frequency operation.
• The [UP]/[DN] switch can simulate a key paddle. Preset
in the keyer set mode. (p. 34)
• MICROPHONE CONNECTOR
(Front panel view)
[MIC]
Pin No.
i Main readout AF output
(varies with [AF]/[BAL])
q Microphone input
u GND
(Microphone ground)
w +8 V DC output
y GND (PTT ground)
e Frequency up/down
t PTT
r Main readout squelch switch
FUNCTION
DESCRIPTION
+8 V DC output
Max. 10 mA
Frequency up
Ground
Frequency down
Ground through 470 Ω
Squelch open
“Low” level
Squelch closed
“High” level
CAUTION: DO NOT short pin 2 to ground as this
can damage the internal 8 V regulator.
NOTE: DC voltage is applied to pin 1 for microphone operation. Take care when using a non-Icom
microphone.
• HM-36 SCHEMATIC DIAGRAM
MICROPHONE
10µ
MICROPHONE CABLE MICROPHONE PLUG
4700p
2k
0.33µ
4700p
MIC
ELEMENT
DOWN
PTT
RECEIVE
UP
w i y
470
TRANSMIT
12
2
INSTALLATION AND CONNECTIONS
■ Unpacking
■ Antenna connection
After unpacking, immediately report any damage to the
delivering carrier or dealer. Keep the shipping cartons.
For radio communications, the antenna is of critical importance, along with output power and sensitivity. Select antenna(s), such as a well-matched 50 Ω antenna,
and feedline. 1.5:1 or better of Voltage Standing Wave
Ratio (VSWR) is recommended for your desired band.
Of course, the transmission line should be a coaxial
cable.
For a description and a diagram of accessory equipment included with the IC-746PRO, see ‘Supplied accessories’ on p. ii of this manual.
■ Selecting a location
Select a location for the transceiver that allows adequate air circulation, free from extreme heat, cold, or
vibrations, and away from TV sets, TV antenna elements, radios and other electro magnetic sources.
The base of the transceiver has an adjustable stand
for desktop use. Set the stand to one of two angles depending on your operating conditions.
When using 1 antenna, use the [ANT1] connector.
CAUTION: Protect your transceiver from lightning
by using a lightning arrestor.
PL-259 CONNECTOR INSTALLATION EXAMPLE
30 mm
Coupling ring
10 mm (soft solder)
10 mm
Soft
solder
1–2 mm
Slide the connector
body on and solder it.
To prevent electrical shock, television interference
(TVI), broadcast interference (BCI) and other problems, ground the transceiver through the GROUND
terminal on the rear panel.
For best results, connect a heavy gauge wire or strap
to a long earth-sunk copper rod. Make the distance between the [GND] terminal and ground as short as possible.
R WARNING: NEVER connect the [GND]
terminal to a gas or electric pipe, since the connection could cause an explosion or electric shock.
13
Strip the cable as
shown at left. Soft solder the center conductor.
solder solder
■ Grounding
Slide the coupling ring
down. Strip the cable
jacket and soft solder.
Screw the coupling
ring
onto
the
connector body.
30 mm ≈ 9⁄8 in 10 mm ≈ 3⁄8 in 1–2 mm ≈ 1⁄16 in
Antenna SWR
Each antenna is tuned for a specified frequency
range and SWR may be increased out-of-range.
When the SWR is higher than approx. 2.0:1, the
transceiver’s power drops to protect the final transistor. In this case, an antenna tuner is useful to match
the transceiver and antenna. Low SWR allows full
power for transmitting even when using the antenna
tuner. The IC-746PRO has an SWR meter to monitor the antenna SWR continuously.
INSTALLATION AND CONNECTIONS
■ Required connections
• Front panel
i746PRO
CW KEY
TUNER
TWIN PBT
HF/VHF TRANSCEIVER
1.8 1
ANT
3.5 2
POWER
F-INP
NR
14 5
21 7
24 8
28 9
SPLIT
GENE
50 0
144 ENT
A/B
10
NOTCH
TRANSMIT
18 6
MW
PBTC
V/M
PHONES
MP-W
A/NOTCH
NR
ELEC-KEY
(dot)
(com)
(dash)
AF
M-CL
M-CH
TS
XFC
RF/SQL
RIT
∂TX
CLEAR
RIT/∂TX
MIC
MIC GAIN
A straight key can be used
when the internal electronic
keyer is turned OFF in keyer
set mode. (p.34)
MP-R
RF PWR
F1
F2
F3
F4
F5
MENU
SSB
CW/RTTY
AM/FM
FILTER
CW PITCH
KEY SPEED
P.AMP/ATT
NB
VOX/BK-IN
MONITOR
LOCK/
SPCH
CALL
MICROPHONES (p. 100)
HM-36
SM-20
(optional)
• Rear panel
144 MHz ANTENNA (pgs. 13, 74)
ANTENNA 1, 2 (pgs. 13, 74)
[Example]: ANT1 for 1.8–18 MHz bands
ANT2 for 21–50 MHz bands
Connect a VHF
(60–144 MHz)
antenna;
impedance: 50 Ω.
DC POWER SUPPLY
PS-125
(Optional)
STRAIGHT KEY
GROUND (p. 13)
Use the heaviest gauge wire or
strap available and make the
connection as short as possible.
(+)
(_)
Grounding prevents electrical
shocks, TVI and other problems.
14
2
INSTALLATION AND CONNECTIONS
■ Advanced connections
• Front panel
i746PRO
TUNER
HEADPHONES
TWIN PBT
HF/VHF TRANSCEIVER
1.8 1
ANT
3.5 2
POWER
F-INP
NR
NOTCH
TRANSMIT
10 4
14 5
21 7
24 8
28 9
SPLIT
GENE
50 0
144 ENT
A /B
18 6
PBTC
MW
V/M
PHONES
MP-W
NR
ELEC-KEY
AF
TX
A/NOTCH
XFC
M-CL
M-CH
TS
MP-R
RX
LOCK
RF/SQL
RIT
∂TX
CLEAR
RIT/∂TX
MIC
MIC GAIN
RF PWR
F1
F2
F3
F4
F5
MENU
SSB
CW/RTTY
AM/FM
FILTER
CW PITCH
KEY SPEED
P.AMP/ATT
NB
VOX/BK-IN
MONITOR
CALL
LOCK/
SPCH
MIC
The AFSK modulation signal
can be input from [MIC]. (p. 77)
• Rear panel
AH-4 (p. 76)
AH-2b
ANTENNA 1, 2 (p. 17)
Connects a linear amplifier,
antenna selector, etc.
When using the AH-4, it must
be connected to the [ANT1]
connector.
[SEND], [ALC] (p. 17)
Used for connecting a
non-Icom linear amplifier.
[DATA] (p. 77)
ACC SOCKETS (pgs. 8, 77)
[REMOTE] (p. 94)
Used for computer control and transceive operation.
EXTERNAL SPEAKER (p. 100)
SP-21
15
INSTALLATION AND CONNECTIONS
■ Power supply connections
CAUTION: Before connecting the DC power
Use an optional DC power supply with a 25 A capacity
and above when operating the transceiver with AC
power. Refer to the diagrams below.
cable, check the following important items. Make
sure:
• The [POWER] switch is OFF.
• Output voltage of the power source is 12–15 V
when you use a non-Icom power supply.
• DC power cable polarity is correct.
: positive + terminal
: negative _ terminal
Red
Black
CONNECTING PS-125 DC POWER SUPPLY
PS-125
Connect to an AC outlet
using the supplied AC cable.
Transceiver
DC power
socket
DC power cable
CONNECTING A DC POWER SUPPLY
AC outlet
Transceiver
A DC power supply
13.8 V; at least 23 A
Black Red
to DC power
socket
Supplied
DC power cable
AC cable
30 A fuses
CONNECTING A VEHICLE BATTERY
NEVER connect to
a 24 V battery.
_ black
+ red
NOTE: Use terminals for
the cable connections.
Crimp
Grommet
12 V
battery
Solder
Supplied
DC power cable
NEVER connect to a battery without supplied DC
fuses, otherwise a fire hazard may occur.
16
INSTALLATION AND CONNECTIONS
■ Linear amplifier connections
Use the [ANT1] connector when connecting a linear
amplifier.
CONNECTING THE IC-PW1
Remote control cable (supplied with the IC-PW1)
To an
antenna ACC(1)
ACC cable (supplied with the IC-PW1)
REMOTE
ANT
Coaxial cable
INPUT1
(supplied with the IC-PW1)
Be sure to connect the cable
to the 7-pin ACC(2) jack.
ACC(2)
EXCITER
1&2
REMOTE
ANT1
GND
GND
IC-PW1
AC outlet
Transceiver
Ground
(Non-European versions: 100—120/220—240 V
European version
: 230 V)
Turn OFF the transceiver’s antenna tuner while tuning the IC-PW1’s tuner.
CONNECTING A NON-ICOM LINEAR AMPLIFIER
R WARNING:
50 Ω coaxial cable
To an
antenna
Set the transceiver output power and linear
amplifier ALC output level referring to the linear
amplifier instruction manual.
ANT1
Transceiver
RF OUTPUT
The ALC input level must be in the range 0 V to
–4 V, and the transceiver does not accept positive voltage. Non-matched ALC and RF power
settings could cause a fire or ruin the linear
amplifier.
RF INPUT
ALC
SEND
ALC
Non-Icom linear amplifier
SEND
The specifications for the SEND relay are
16 V/DC 0.5 A. If this level is exceeded, a large
external relay must be used.
■ External antenna tuner connection
CONNECTING THE AH-4
The AH-4 must be connected to [ANT1].
Long wire or optional AH-2b
Coaxial cable (from AH-4)
Transceiver
ANT1
Control cable
17
Ground
AH-4
3
BASIC OPERATION
■ When first applying power (CPU resetting)
Before first applying power, make sure all connections
required for your system are complete by referring to
Chapter 2. Then, reset the transceiver using the following procedure.
NOTE: When first applying power or when operating in cold environments, the display may flicker or
appear faint. This is normal and will disappear once
the transceiver has warmed up.
q Make sure the transceiver power is OFF.
w While pushing [M-CL] and [F-INP], push [POWER]
for 1 sec. to turn power ON.
[POWER]
[F-INP] [M-CL]
• The internal CPU is reset.
• The transceiver displays its initial VFO frequency when
resetting is complete.
e Correct the set mode settings after resetting, if desired.
Resetting CLEARS all programmed contents in
memory channels and returns programmed values
in set mode to default values.
■ Initial settings
After resetting the transceiver, set controls and
switches as shown in the figure below.
[NR]: Max. CCW
: Clockwise
: Counterclockwise
[NOTCH]: Max. CCW
i746PRO
TUNER
CW
CCW
TWIN PBT
HF/VHF TRANSCEIVER
ANT
1.8 1
3.5 2
10 4
14 5
18 6
21 7
24 8
28 9
SPLIT
GENE
50 0
144 ENT
A /B
POWER
F-INP
NR
NOTCH
TRANSMIT
[TRANSMIT]: OFF
PHONES
MP-W
NR
ELEC-KEY
AF
XFC
MW
V/M
M-CL
M-CH
TS
MP-R
TX
A/NOTCH
PBTC
RX
LOCK
RF/SQL
RIT
[AF]: Max. CCW
[RF/SQL]: 12 o’clock
F1
F2
F3
F4
F5
MENU
SSB
CW/RTTY
AM/FM
FILTER
[MIC GAIN]: Max. CCW
MIC GAIN
[RF PWR]: Max. CCW
∂TX
CLEAR
RIT/∂TX
MIC
RF PWR
CW PITCH
KEY SPEED
P.AMP/ATT
[CW PITCH]: 12 o’clock
NB
VOX/BK-IN
MONITOR
CALL
LOCK/
SPCH
[KEY SPEED]: Max. CCW
18
3
BASIC OPERATION
■ Selecting an operating band
The transceiver has a triple band stacking register.
This means that the last 3 operating frequencies and
modes used on a particular band are automatically
memorized.
Band keys
See the table below for a list of the bands available
and the default settings for each register.
BAND
REGISTER 1
REGISTER 2
REGISTER 3
1.8 MHz
1.900000 MHz CW
1.910000 MHz CW
1.915000 MHz CW
3.5 MHz
3.550000 MHz LSB
3.560000 MHz LSB
3.580000 MHz LSB
7 MHz
7.050000 MHz LSB
7.060000 MHz LSB
7.020000 MHz CW
10 MHz
10.120000 MHz CW
10.130000 MHz CW
10.140000 MHz CW
14 MHz
14.100000 MHz USB
14.200000 MHz USB
14.050000 MHz CW
18 MHz
18.100000 MHz USB
18.130000 MHz USB
18.150000 MHz USB
21 MHz
21.200000 MHz USB
21.300000 MHz USB
21.050000 MHz CW
24 MHz
24.950000 MHz USB
24.980000 MHz USB
24.900000 MHz CW
28 MHz
28.500000 MHz USB
29.500000 MHz USB
28.100000 MHz CW
50 MHz
50.100000 MHz USB
50.200000 MHz USB
51.000000 MHz FM
144 MHz
General
145.000000 MHz FM
15.000000 MHz USB
145.100000 MHz FM
145.200000 MHz FM
15.100000 MHz USB
15.200000 MHz USB
D Using the band stacking registers
q Push [14 5], then select a frequency and an operating mode.
• Frequency and operating mode are memorized in the
first band stacking register.
1.8 1
3.5 2
w Push [14 5] again, then select another frequency
and operating mode.
10 4
14 5
18 6
• This frequency and operating mode are memorized in
the second band stacking register.
21 7
24 8
28 9
GENE
50 0
144 ENT
e Push [14 5] again, then select another frequency
and operating mode.
• This frequency and operating mode are memorized in
the third band stacking register.
• When a fourth frequency and operating mode are selected on a band, the first register. set in step q, is overwritten.
19
[Example]: 14 MHz band
BASIC OPERATION
■ Selecting VFO/memory mode
[V/M]
VFO is an abbreviation of Variable Frequency Oscillator, and traditionally refers to an oscillator.
➥ Push [V/M] to switch between VFO and memory
modes.
• Pushing [V/M] for 1 sec. transfers the contents of the selected memory channel to VFO mode (p. 65).
■ VFO operation
The transceiver has 2 VFOs and are called VFO A and
VFO B. You can use the desired VFO to call up a frequency and operating mode for your operation.
D Selecting the VFO A/B
[A/B]
➥ Push [A/B] to switch between the VFO A and
VFO B.
• “VFO A” or “VFO B” appears.
Either one is appears
D VFO equalization
➥ Push [A/B] for 1 sec. to equalize the undisplayed
VFO condition to the displayed VFO.
• 3 beeps sound when the VFO equalization is completed.
CONVENIENT
Use two VFOs as a quick memory
When you find a new station, but you wish to continue
searching, the Two VFO system can be used for quick memory storage.
Push
A /B
for 1 sec.
q Push [A/B] for 1 sec. to store the displayed frequency into
the undisplayed VFO.
w Continue to searching for stations.
e Push [A/B] to retrieve the stored frequency.
r To continue searching for station, push [A/B] again.
20
3
BASIC OPERATION
■ Frequency setting
The transceiver has several tuning methods for convenient frequency tuning.
D Tuning with the tuning dial
Band keys
q Push the desired band key on the keypad 1–3
times.
• 3 different frequencies can be selected on each band
with the band key. (p. 19)
w Rotate the tuning dial to set the desired frequency.
If the dial lock function is activated, the lock indicator
lights, and the tuning dial does not function. In this
case, push [LOCK/SPCH] to deactivate the lock
function. (see p. 53 for details)
Tuning dial
D Quick tuning step
The operating frequency can be changed in kHz steps
(0.1, 1, 5, 9, 10, 12.5, 20 or 25 kHz selectable) for
quick tuning.
q Push [SSB], [CW/RTTY] or [AM/FM] to select the
desired operation mode.
w Push [TS] momentarily to activate the quick tuning
function.
• “▼” appears.
Select mode
e Push [TS] for 1 sec. to enter the tuning step set
mode.
r Rotate the tuning dial to select the desired tuning
step.
t Push [TS] to exit the tuning step set mode.
[TS]
SSB
1kHz
D 1⁄4 Tuning step function (SSB data, CW and RTTY only)
While operating in SSB data/CW/RTTY, the 1⁄4 function
is available for critical tuning. Dial rotation is reduced to
1⁄4 of normal when the 1⁄4 function is in use.
➥ While M1 is selected with [MENU], push [F3 1/4]
to toggle the 1⁄4 function ON and OFF.
1⁄4
indicator
D Auto tuning step function
When rotating the tuning dial rapidly, the tuning step
automatically changes several times as selected.
q Push [MENU] for 1 sec. to enter the set mode.
w Push [F1≤] or [F2 ≥] to select the DIAL Auto
TS item.
e Rotate the tuning dial to select the function ON
(HIGH or LOW) and OFF.
• HIGH : Approx. 5 times faster
• LOW : Approx. 2 times faster
• OFF : Auto tuning step is turned OFF.
r Push [MENU] to exit the set mode.
21
DIAL
27
Auto
TS
HIGH
BASIC OPERATION
D Selecting the 1 Hz step
The minimum tuning step of 1 Hz can be used for fine
tuning.
q Push [TS] momentarily to turn the quick tuning step
OFF
• “▼” disappears.
w Push [TS] for 1 sec. to toggle the 1 Hz tuning step
ON and OFF.
[TS]
1 Hz indicator
D Band edge warning beep
When selecting a frequency that lies outside of a
band’s specified frequency range, a warning beep
sounds.
This function can be turned OFF in set mode, if desired. (p. 81)
D Frequency setting with the keypad
The transceiver has a keypad for direct frequency
entry as described below.
Lights when kypad input is activated.
Keypad [F-INP]
q Push [F-INP].
• F-INP indicator lights
w Input the desired frequency.
• Input “ • ” (decimal point) between the MHz units and kHz
units.
e Push [144 ENT] to enter the input frequency.
• To cancel the input, push [A/B] instead of [144 ENT].
[EXAMPLE]
14.025 MHz
Push
F-INP
50 0
1.8 1
10 4
GENE
50 0
GENE
21 7
50 0
18 6
144 ENT
3.5 2
10 4
14 5
144 ENT
3.5 2
14 5
144 ENT
706 kHz
Push
F-INP
21.280 MHz
Push
F-INP
GENE
21.245 MHz
22
3
BASIC OPERATION
■ Operating mode selection
SSB (USB/LSB), SSB data (USB data/LSB data), CW,
CW reverse (CW-R), RTTY, RTTY-R (RTTY reverse),
AM, AM data, FM and FM data modes are available in
the IC-746PRO. Select the desired operation mode as
follows.
To select a mode of operation, push the desired mode
switch momentarily. Push the switch again to toggle
between USB and LSB, CW/CW-R and RTTY/RTTYR, AM and FM, if necessary. Push the switch for 1 sec.
to toggle between CW and CW-R, RTTY and RTTY-R,
or to select data mode, if necessary.
See the diagram right below for the order of selection.
[SSB] [CW/RTTY] [AM/FM]
Microphone signals are muted when data mode is
selected.
• Selecting SSB mode
➥ Push [SSB] to select USB or LSB.
• USB is selected first during above 10 MHz; or LSB is selected first during below 10 MHz operation.
• After USB or LSB is selected, push [SSB] to toggles between USB and LSB.
• After USB or LSB is selected, push [SSB] for 1 sec. to
select USB data or LSB data mode, respectively.
SSB
D USB
USB
CW-R
CW
D AM
AM
LSB
D LSB
RTTY
RTTY-R
FM
D FM
CW/RTTY
AM/FM
• Selecting CW/RTTY mode
➥ Push [CW/RTTY] to select CW or RTTY.
• After CW/CW-R or RTTY/RTTY-R is selected, push
[CW/RTTY] to toggles between CW and RTTY.
• After CW or RTTY is selected, push [CW/RTTY] for
1 sec. to toggles between CW and CW reverse, or,
RTTY and RTTY reverse mode, respectively.
Push mode switch
for 1 sec.
• Selecting AM/FM mode
➥ Push [AM/FM] to select AM or FM.
• After AM or FM is selected, push [AM/FM] to toggles between AM and FM mode.
• After AM or FM is selected, push [AM/FM] for 1 sec. to
select AM data or FM data mode, respectively.
■ Volume setting
➥ Rotate [AF] control to output a suitable audio level.
AF
23
RF/SQL
Decreases
Increases
No audio output
Max. audio output
[AF] control
Push mode switch
momentarily.
BASIC OPERATION
■ Squelch and receive (RF) sensitivity
Adjusts the RF gain and squelch threshold level. The
squelch removes noise output from the speaker
(closed position) when no signal is received.
[RF/SQL] control
• The squelch is particularly effective for FM. It is also available for other modes.
• The control can be set as the RF gain control only (squelch
is fixed open) or squelch control (RF gain is fixed at maximum) in set mode (p. 81). See below right.
• The 11 to 12 o’clock position is recommended for any setting of the [RF/SQL] control.
SET MODE
OPERATION
RF+SQL
(default)
Can be used in all modes.
Functions as noise squelch or S-meter
squelch in AM and FM; S-meter
squelch only in other modes.
SQL
Noise squelch (FM mode)
Recommended level
Squelch is
open.
Maximum
RF gain
➥ Operates as a squelch control.
• RF gain is fixed at max. sensitivity.
➥ Operates as an RF gain control in
SSB, CW and RTTY.
AUTO
• When setting as RF gain/squelch control
RF gain
adjustable
range
S-meter
squelch
• Squelch is fixed open.
➥ Operates as an squelch control in
AM and FM.
• RF gain is fixed at max. sensitivity.
• When functioning as RF gain control (Squelch is
fixed open; SSB, CW, RTTY only)
Adjusting RF gain (Receive sensitivity)
Normally, [RF/SQL] is set to the 11 o’clock position.
Rotate [RF/SQL] to the 11 o’clock position for maximum sensitivity.
• Rotating counterclockwise from the maximum position reduces sensitivity.
• The S-meter indicates receive sensitivity.
Maximum
RF gain
Adjustable
range
Minimum RF gain
• When functioning as squelch control (RF gain is
Adjusting squelch (Removing non-signal noise)
Rotate [RF/SQL] clockwise, when receiving no signal,
until the noise just disappears.
• [RX] indicator light goes out.
• Rotating [RF/SQL] past the threshold point invokes the Smeter squelch— this allows you to set a minimum signal
level needed to open the squelch.
fixed at maximum)
Noise squelch
threshold
(FM mode)
Noise squelch (FM mode)
Squelch is
open.
Shallow
S-meter squelch
threshold
S-meter
squelch
Deep
24
3
BASIC OPERATION
■ Basic transmit operation
Before transmitting, monitor your selected operating frequency to make sure transmitting won’t
cause interference to other stations on the same
frequency.
D Transmitting
Before transmitting, monitor your selected operating
frequency to make sure transmitting won’t cause interference to other stations on the same frequency.
[TRANSMIT]
q Push [TRANSMIT] or [PTT] (microphone) to transmit.
• The [TX] indicator lights red.
w Push [TRANSMIT] again or release [PTT] (microphone) to return to receive.
[MIC GAIN] [RF PWR]
D Microphone gain adjustment
Before transmitting, monitor your selected operating
frequency to make sure transmitting won’t cause interference to other stations on the same frequency.
q Push [PTT] (microphone) to transmit.
• Talk into the microphone at your normal voice level.
w While talking into the microphone, rotate [MIC
GAIN] so that the ALC meter reading doesn’t go
outside the ALC zone (see right).
w Release [PTT] (microphone) to return to receive.
25
ALC zone
[TX] indicator
4
RECEIVE AND TRANSMIT
■ Operating SSB
q Push a band key to select the desired band.
w Push [SSB] to select LSB or USB.
[TRANSMIT]
[TX] indicator
Band keys
• Below 10 MHz LSB is automatically selected; above
10 MHz USB is automatically selected.
e Rotate [AF] to set audio to a comfortable listening
level.
r Rotate the tuning dial to tune a desired signal.
• S-meter indicates received signal strength.
t Push [TRANSMIT] or [PTT] (microphone) to transmit.
• The TX indicator lights red.
y Speak into the microphone at your normal voice
level.
[MIC GAIN]
[SSB]
Tuning dial
“LSB” or “USB” appeare
• Adjust [MIC GAIN] at this step, if necessary.
u Push [TRANSMIT] or release [PTT] (microphone) to
return to receive.
D Convenient functions for receive
• Preamp and attenuator (p. 48)
➥ Push [P.AMP/ATT] several times to set the preamp OFF, preamp 1 ON or preamp 2 ON.
• Auto notch filter (p. 53)
➥ Push [A/NOTCH] to turn the auto or manual
notch function ON and OFF.
• “P.AMP1,” “P.AMP2” or “P.AMP” appears when the
preamp 1, preamp 2 or preamp is set to ON, respectively. (depending on operating frequency band)
• Rotate [NOTCH] control to set attenuate frequency for
manual notch operation.
➥ Push [P.AMP/ATT] for 1 sec. to set the attenuator
ON.
• Push [P.AMP/ATT] momentarily to turn the attenuator
OFF.
• “ATT” appears when the attenuator is set to ON.
• Noise blanker (p. 51)
➥ Push [NB] to turn the noise blanker ON and OFF.
• “NB” appears when the noise blanker is set to ON.
• Push [NB] for 1 sec. to enter noise blanker set mode.
• Noise reduction (p. 53)
➥ Push [NR] to turn the noise reduction ON and OFF.
• Rotate [NR] control to adjust the noise reduction level.
• “NR” appears when the noise reduction is set to ON.
• Twin PBT (passband tuning) (p. 52)
➥ Rotate [TWIN PBT] controls (inner/outer).
• Push [PBTC] to clear the settings.
• AGC (auto gain control) (p. 49)
➥ While M1 is selected with [MENU], push
[F1 AGC] several times to select AGC F,
AGC M, AGC S or AGC OFF.
• VSC (voice squelch control) (p. 00)
➥ While M2 is selected with [MENU], push
[F5 VSC] to turn the VSC function ON and OFF.
• The VSC indicator appears when the voice squelch
function is set to ON.
D Convenient functions for transmit
• Speech compressor (p. 58)
➥ While M1 is selected with [MENU], push [F3
CMP] to turn the speech compressor ON and
OFF.
• Transmit quality monitor (p. 57)
➥ Push [MONITOR] to turn the monitor function ON
and OFF.
• “COMP” appears when the speech compressor is set
to ON.
• “MONI” appears when the monitor function is set to
ON.
• VOX (voice operated transmit) (p. 54)
➥ Push [VOX/BK-IN] to turn the VOX function ON
and OFF.
• Audio tone control (p. 88)
➥ While M2 is selected with [MENU], push [F4
TCN], select an item with [F1 ≤] and [F2 ≥] then
rotate the tuning dial to adjust the audio tone.
• “VOX” appears when the VOX function is set to ON.
26
4
RECEIVE AND TRANSMIT
■ Operating CW
q Push a band key to select the desired band.
w Push [CW/RTTY] to select CW.
[TRANSMIT]
[TX] indicator
Band keys
• After CW mode is selected, push [CW/RTTY] for 1 sec.
to toggle between CW and CW-R modes.
e Rotate [AF] to set audio to a comfortable listening
level.
r Rotate the tuning dial to simultaneously tune a desired signal and its side tone.
• S-meter indicates received signal strength.
t Push [TRANSMIT] to transmit.
• The TX indicator lights red.
y Use the electric keyer or paddle to key your CW signals.
[CW PITCH]
[KEY SPEED]
[CW/RTTY]
Tuning dial
“CW” or “CW-R” appeare
• The Po meter indicates transmitted CW signal strength.
u Push [TRANSMIT] to return to receive.
D Convenient functions for receive
• Preamp and attenuator (p. 48)
➥ Push [P.AMP/ATT] several times to set the preamp OFF, preamp 1 ON or preamp 2 ON.
• Auto notch filter (p. 53)
➥ Push [A/NOTCH] to turn the auto or manual
notch function ON and OFF.
• “P.AMP1,” “P.AMP2” or “P.AMP” appears when the
preamp 1, preamp 2 or preamp is set to ON, respectively. (depending on operating frequency band)
• Rotate [NOTCH] control to set attenuate frequency for
manual notch operation.
➥ Push [P.AMP/ATT] for 1 sec. to set the attenuator
ON.
• Push [P.AMP/ATT] momentarily to turn the attenuator
OFF.
• “ATT” appears when the attenuator is set to ON.
• Noise blanker (p. 51)
➥ Push [NB] to turn the noise blanker ON and OFF.
• “NB” appears when the noise blanker is set to ON.
• Push [NB] for 1 sec. to enter noise blanker set mode.
• Noise reduction (p. 53)
➥ Push [NR] to turn the noise reduction ON and
OFF.
• Rotate [NR] control to adjust the noise reduction level.
• “NR” appears when the noise reduction is set to ON.
D Convenient functions for transmit
• Break-in function (p. 56)
➥ Push [VOX/BK-IN] several times to set the breakin OFF, semi break-in or full break-in.
• “BK-IN” or “F BK-IN” appears when the semi break-in
or full break-in is set to ON, respectively.
27
• Twin PBT (passband tuning) (p. 52)
➥ Rotate [TWIN PBT] controls (inner/outer).
• Push [PBTC] to clear the settings.
• AGC (auto gain control) (p. 49)
➥ While M1 is selected with [MENU], push
[F1 AGC] several times to select AGC F,
AGC M, AGC S or AGC OFF.
• 1⁄4 function (p. 21)
➥ While M1 is selected with [MENU], push
[F3 1/4] to turn the 1⁄4 function ON and OFF.
RECEIVE AND TRANSMIT
D About CW reverse mode
CW reverse mode receives CW signals with a reverse
side CW carrier point like that of LSB and USB modes.
Use this mode when interfering signals are near the
desired signal and you want to change the interference
tone.
Use when interfering signals are near a desired signal
and you want to change the interference tone.
q Push [CW/RTTY] several times to select CW mode.
w Push [CW/RTTY] for 1 sec. to select CW or CW-R
mode.
Push for 1 sec.
CW/RTTY
BFO
BFO
Interference Desired signal
Interference Desired signal
CW mode (LSB side)
CW-R mode (USB side)
• Check the interfering tone.
D About CW pitch control
The received CW audio pitch and monitored CW audio
can be adjusted to suit your preference (300 to 900 Hz
in 25 Hz steps) without changing the operating frequency.
[CW PITCH]
D About keying speed
The transceiver’s internal electronic keyer speed can
be adjusted from 6 to 60 wpm.
➥ Rotate [KEY SPEED] clockwise to increase keying
speed; counterclockwise to decrease keying speed.
[KEY SPEED]
D CW side tone function
When the transceiver is in the receive condition (and
the break-in function is OFF— p. 56) you can listen to
the tone of your CW signal without actually transmitting. This allows you to match your transmit signal exactly to another station’s. This also convenient for CW
practice. CW side tone level can be adjusted in keyer
set mode (p. 33).
28
4
RECEIVE AND TRANSMIT
■ Electronic keyer functions
The transceiver has a number of convenient functions
for the electronic keyer that can be accessed from the
memory keyer menu.
q Push [CW/RTTY] to select CW mode.
w Push [MENU] to select M1.
e Push [F4 KEY] to select the memory keyer menu.
• The selectable menu can be changed with the keyer
send menu in the set mode. (p. 86)
r Push one of the multi-function keys ([F1] to [F5]) to
select an item in the memory keyer menu. See the
diagram below.
• Push [MENU] to return to the previous indication.
[MENU] [CW/RTTY]
D IN CW MODE
• Keyer send menu (p. 40)
Push
[F2]
AGC
F1
DUP
F2
1/4
KEY
F3
F4
SCP
Push
[F3]
M1
M2
M3
M4
F1
F2
F3
F4
-1
F5
• Edit menu (p. 31)
M1
CQ
ç
F1
F2
TEST
å
CQ TEST
DEL SPC
F5
F3
F4
F5
Push [F4]
Push [MENU]
• Memory keyer menu
SND
EDT
001
SET
F2
F3
F4
F5
Push
[F4]
• Contest number set mode (p. 32)
Number
F1
F1
Push
[F5]
F3
F4
F5
• Keyer set mode (p. 33)
Side
F1
29
F2
Style
Normal
F2
Tone
F3
Level
5O%
F4
F5
RECEIVE AND TRANSMIT
D Memory keyer send menu
Pre-set characters can be sent using the keyer send
menu. Contents of the memory keyer are set using the
edit menu.
• Transmitting
q While M1 is selected in CW mode, push [F4 KEY]
to select the memory keyer menu.
w Push [F2 SND] to select the keyer send menu.
e Push [TRANSMIT] to set the transceiver to transmit, or set the break-in function ON (p. 56).
r Push one of the function keys ([F1] to [F4]) to send
the contents of the memory keyer.
• Pushing a function key for 1 sec. repeatedly sends the
contents; push any function key to cancel the transmission.
• The contest number counter, above [F5], is incremented
each time the contents are sent.
• Push [F5] to reduce the contact number count by 1 when
resending contents to unanswered calls.
For your information
When an external keypad is connected to the
pin 3 and pin 7 of the [MIC] connector, the programmed contents, M1—M4, can be transmitted
without selecting the keyer send menu.
See p. 86 for details.
M1
M2
M3
M4
F1
F2
F3
F4
001
-1
F5
r Push [MENU] 2 times to return to M1.
M1 send indication
M1
M2 send indication
CQ TEST
M2
M3
CQ
M4
001
-1
M1
Repeat send indication
CQ TEST
M2
M3
M2 send indication
CQ
M4
001
-1
Repeat indicators
M1
UR 5NN001 B
M2
M3
M4
Count up trigger
indicator
M3 send indication
M1
001
-1
F2
F1
M1
UR 5NN001 B
M2
M3
M4
001
-1
Counter
M4 send indication
QRZ?
M2
M3
F3
M4
-1
M1
CFM
M2
TU
M3
M4
001
-1
F4
30
4
RECEIVE AND TRANSMIT
D Editing a memory keyer
The contents of the memory keyer memories can be
set using the memory keyer edit menu. The memory
keyer can memorize and re-transmit 4 CW key codes
for often-used CW sentences, contact numbers, etc.
Total capacity of the memory keyer is 50 characters
per memory channel.
• Programming contents
q Push [MENU] to select M1, then push [F4 KEY] to
select the memory keyer menu.
w Push [F3 EDIT] to select edit menu.
• Edit menu
• Memory keyer contents of the channel 1 (M1) is indicated.
• Push [F5] to manually increment the contest number.
e Push [F1] to select the desired memory keyer channel to be edited.
r Input the desired character by rotating the tuning
dial or by pushing the keypad for number input.
• Selectable characters (with the tuning dial);
A B C D E F G H I J K L M N O P Q R S T
U V W X Y Z / ? . , * ^
NOTE:
“^” is used to transmit a following word with no
space such as AR. Put “^” before a text string
such as ^AR, and the string “AR ” is sent with no
space.
“*” is used to insert the CW contact number. The
contact number automatically increments by 1.
This function is only available for one memory
keyer channel at a time. Memory keyer channel
M2 used “*” by default.
M1
CQ
ç
F1
F2
TEST
å
F3
M2
UR
ç
5NN*
å
BK
DEL
SPC
When inputting an astarisk,
the counter is incremented by 1.
Pre-programmed contents
• M4 default indication
M2 UR 5NN* BK
F5
• M2 default indication
• M3 default indication
M3
Contents
M1 CQ TEST CQ TEST DE JA1 JA1 TEST
F4
Move cursor left/right
Input space
Select M1 to M4
Clear character
t Push [F2 ç] or [F3 å] to move the cursor backwards or forwards, respectively.
y Repeat steps r and t to input the desired characters.
u Push [MENU] 2 times to return to M1.
CH
CQ TEST
DEL SPC
M4
CFM
ç
TU
å
QRZ?
ç
å
DEL
SPC
DEL
SPC
M3 CFM TU
M4 QRZ?
31
Example display— when inputting “QSL TU
DE JA3YUA TEST” into M3.
M3
QSL
ç
M3
DE
ç
TU
å
DE JA3Y
DEL SPC
JA3YUA TEST
å
DEL SPC
RECEIVE AND TRANSMIT
D Contest number set mode
This menu is used to set the contest (serial) number
and count up trigger, etc.
• Setting contents
q Push [MENU] to select M1, then push [F4 KEY] to
select the memory keyer menu.
w Push [F4 001] to enter the contest number set
mode.
e Push [F1≤] or [F2 ≥] to select the desired set item.
r Set the desired condition using the tuning dial.
• Push [F3] for 1 sec. to select a default condition or value.
t Push [MENU] 2 times to return to M1.
Side
F1
F2
Tone
F3
Level
5O%
F4
F5
Set item up/down
1. Number Style
This item sets the numbering system used for contact
(serial) numbers— normal or morse cut numbers.
• Normal
• 190
• 190
• 90
• 90
ANO
ANT
NO
NT
Style
Normal
Number
: Does not use morse cut number
(default)
: Sets 1 as A, 9 as N and 0 as O.
: Sets 1 as A, 9 as N and 0 as T.
: Sets 9 as N and 0 as O.
: Sets 9 as N and 0 as T.
2. Count Up Trig
This item sets the count up trigger channel.
• M1, M2, M3 and M4 can be set. (default: M2)
Count
Up
Trig
M2
3. Present Number
This item shows the current number for the count up
trigger channel set above.
• Rotate the tuning dial to change the number, or push
[F3 CLR] for 1 sec. to reset the current number to 001.
Present
CLR
Number
001
32
4
RECEIVE AND TRANSMIT
D Keyer set mode
This set mode is used to set the CW side tone, memory keyer repeat time, dash weight, paddle specifications, keyer type, etc.
• Setting contents
q Push [MENU] to select M1, then push [F4 KEY] to
select the memory keyer menu.
w Push [F5 SET] to select keyer set mode.
e Push [F1≤] or [F2 ≥] to select the desired set item.
r Set the desired condition using the tuning dial.
• Push [F3] for 1 sec. to select a default condition or value.
t Push [MENU] 2 times to return to M1.
Side
F1
F2
Tone
F3
Level
5O%
F4
F5
Set item up/down
1. Side Tone Level
This item sets the CW side tone output level.
• 0 to 100% in 1% step can be selected.
Side
Tone
Level
5O%
Side
Tone
L-lmt
ON
2. Side Tone L-lmt
This item sets the CW side tone level limit. When the
[AF] control is rotated above a specified level, the CW
side tone does not increase.
ON
OFF
CW side tone level is limited. (default)
CW side tone level is not limited.
3. Repeat Time
When sending CW using the repeat timer, this item
sets the time between transmission.
• 1 to 60 sec. in 1 sec. step can be selected.
Repeat
Time
2s
4. Dot/Dash Ratio
This item sets the dot/dash ratio.
• 1:1:2.8 to 1:1:4.5 (in 0.12 step) can be selected.
Dot/Dash Ratio
1:1:3.O
Keying weight example: Morse code “K”
Weight setting:
1:1:3 (default)
DASH
DOT (fixed*)
DASH
Weight setting:
Adjusted
Adjustable range
33
*SPACE and DOT length can be
adjusted with [KEY SPEED] only.
SPACE (fixed*)
RECEIVE AND TRANSMIT
5. Rise Time
This item set the envelop time period which the output
power becomes the set transmit power.
• 2, 4, 6 or 8 msec. can be selected.
Time
Rise
4ms
• About rise time
Tx
Key action
Rx
Tx output power
Set Tx power level
Time
6. Paddle Polarity
This item sets the paddle polarity.
• Normal and reverse polarity can be selected.
Polarity
NORMAL
Paddle
7. Keyer Type
This item selects the keyer type for [ELEC-KEY] connector on the front panel.
• ELEC-KEY, BUG KEY and Straight key can be selected.
Keyer
Type
ELEC-KEY
8. MIC U/D Keyer
This item allow you to set the microphone [UP]/[DN]
keys to be used as a paddle.
ON
OFF
MIC
U/D
Keyer
OFF
[UP]/[DN] switches can be used for CW.
[UP]/[DN] switches cannot be used for
CW.
NOTE: When “ON” is selected, the frequency and
memory channel cannot be changed using
the [UP]/[DN] switches.
34
4
RECEIVE AND TRANSMIT
■ Operating RTTY (FSK)
Before operating RTTY, be sure to consult the manual
that come with your TNC.
q Push a band key to select the desired band.
w Push [CW/RTTY] several times to select RTTY.
[TRANSMIT]
[TX] indicator
Band keys
• After RTTY mode is selected, push [CW/RTTY] for
1 sec. to toggle RTTY and RTTY-R modes.
e Rotate [AF] to set audio to a comfortable listening
level.
r Rotate the tuning dial to tune a desired signal.
• S-meter indicates received signal strength.
• If the received signal cannot be demodulated, try selecting RTTY-R mode.
t Push [TRANSMIT] to set the transceiver to the
transmit condition or transmit a SEND signal from
your TNC.
[CW/RTTY]
Tuning dial
“RTTY” or “RTTY-R” appeared
• The TX indicator lights red.
• The Po meter indicates transmitted RTTY signal strength.
y Operate the connected PC or TNC (TU) to transmit
RTTY (FSK) signals.
• Adjust [MIC GAIN] at this step, if necessary.
u Push [TRANSMIT] to return to receive.
D Convenient functions for receive
• Preamp and attenuator (p. 48)
➥ Push [P.AMP/ATT] several times to set the preamp OFF, preamp 1 ON or preamp 2 ON.
• Noise reduction (p. 53)
➥ Push [NR] to turn the noise reduction ON and
OFF.
• “P.AMP1,” “P.AMP2” or “P.AMP” appears when the
preamp 1, preamp 2 or preamp is set to ON, respectively. (depending on operating frequency band)
• Rotate [NR] control to adjust the noise reduction level.
• “NR” appears when the noise reduction is set to ON.
➥ Push [P.AMP/ATT] for 1 sec. to set the attenuator
ON.
• Push [P.AMP/ATT] momentarily to turn the attenuator
OFF.
• “ATT” appears when the attenuator is set to ON.
• Noise blanker (p. 51)
➥ Push [NB] to turn the noise blanker ON and OFF.
• “NB” appears when the noise blanker is set to ON.
• Push [NB] for 1 sec. to enter noise blanker set mode.
D Convenient functions for transmit
• Transmit quality monitor (p. 57)
➥ Push [MONITOR] to turn the monitor function ON
and OFF.
• “MONI” appears when the monitor function is set to
ON.
35
• Twin PBT (passband tuning) (p. 52)
➥ Rotate [TWIN PBT] controls (inner/outer).
• Push [PBT C] to clear the settings.
• AGC (auto gain control) (p. 49)
➥ While M1 is selected with [MENU], push
[F1 AGC] several times to select AGC F,
AGC M, AGC S or AGC OFF.
• 1⁄4 function (p. 21)
➥ While M1 is selected with [MENU], push
[F3 1/4] to turn the 1⁄4 function ON and OFF.
RECEIVE AND TRANSMIT
■ RTTY functions
The transceiver has a number of convenient functions
for the RTTY operation that can be accessed from the
RTTY menu.
q Push [CW/RTTY] to select RTTY mode.
w Push [MENU] to select M1.
e Push [F4 RTY] to select the RTTY menu.
r Push one of the multi-function keys ([F2], [F4] or
[F5]) to select an item in the RTTY menu. See the
diagram below.
• Push [MENU] to return to the previous indication.
[MENU] [CW/RTTY]
D IN RTTY MODE
Switches RTTY filter ON and OFF.
AGC
DUP
1/4
RTY
SCP
F1
F2
F3
F4
F5
Push [F4]
• RTTY menu
RTTY-FIL ON
DEC
FIL
F1
F2
F3
F4
SET
F5
DEC
Push
[F4]
F2
F1
FIL
SET
F4
F5
F3
Push • RTTY filter set mode (p. 37)
[F4] for
Band Width
1 sec.
35O
F2
F1
F3
F4
F5
Push [F2]
• RTTY decoder screen (p. 38)
Push • RTTY set mode (p. 39)
[F5]
RTTY
ADJ
F1
F2
F3
F4
F5
F2
F1
Mark
2125
F3
F4
F5
D About RTTY reverse mode
Received characters are occasionally garbled when
the receive signal is reversed between MARK and
Space. This reversal can be caused by incorrect TNC
connections, setting, commands, etc. To receive reversed RTTY signal correctly, select RTTY-R mode.
➥ While RTTY mode is selected, push [CW/RTTY]
for 1 sec. to select the RTTY reverse mode.
• “RTTY-R” appears when the RTTY reverse mode is selected.
• Push [CW/RTTY] for 1 sec. again to select the normal
RTTY mode.
Normal
170 Hz
Reverse
2125 Hz
Space Mark
2125 Hz
BFO
BFO
170 Hz
Space
Mark
36
4
RECEIVE AND TRANSMIT
D RTTY filter/Twin peak filter
The transceiver has 5 RTTY filters in addition to normal IF filters. The passband width can be selected
from 1 kHz, 500 Hz, 350 Hz, 300 Hz and 250 Hz.
When the RTTY filter is turned ON, the RTTY tuning
meter can be used.
Moreover, the twin peak filter changes the receive frequency response by boosting 2 particular frequencies
(2125 and 2295 Hz) for better copying of desired
RTTY signals.
• RTTY filter and twin peak filter setting
q Push [CW/RTTY] to select RTTY mode.
• After RTTY mode is selected, push [CW/RTTY] for 1 sec.
to select RTTY-R mode.
w Push [MENU] several times to select M1.
e Push [F4 RTY] to select RTTY menu.
r Push [F4 FIL] to turn the RTTY filter ON and OFF.
AGC
DUP
1/4
RTY
SCP
F1
F2
F3
F4
F5
RTTY filter indicator
• When the RTTY filter is turned ON, the normal IF filter
number indication (1, 2 or 3) disappear.
t Push [F4 FIL] for 1 sec. to enter RTTY filter set
mode (see below).
y Push [F1≤] to select bandwidth item.
u Rotate the tuning dial to select the RTTY filter width
from 1 kHz, 500 Hz, 350 Hz, 300 Hz and 250 Hz.
Rotate the tuning dial at the
point where the both sides of
dots are appeared equality.
• Push [F3] for 1 sec. to select a default value.
RTTY-FIL ON
DEC
FIL
i Push [F2 ≥] to select twin peak filter item.
• The received audio volume may become greater when
the twin peak filter is turned ON.
o Rotate the tuning dial to turn the twin peak filter
function ON and OFF.
!0 Push [MENU] 2 times to return to M1.
Push [F4]
F1
F2
F3
SET
F4
F5
Disappears when the RTTY
filter is turned OFF.
• RTTY filter set mode
1. Band Width
This item sets the RTTY filter width.
• 250, 300, 350, 500 Hz and 1 kHz can be selected.
Band
Width
Twin
Peak
35O
2. Twin Peak FIL
This item turn the twin peak filter ON and OFF.
37
FIL
ON
RECEIVE AND TRANSMIT
D RTTY decoder
The transceiver has an RTTY decoder for Baudot
(mark freq.: 2125 Hz, shift freq.: 170 Hz, 45 bps).
An external terminal unit (TU) or terminal node connector (TNC) is not necessary for receiving a Baudot
signal.
q Push [CW/RTTY] to select RTTY mode.
• After RTTY mode is selected, push [CW/RTTY] for 1 sec.
to select RTTY-R mode.
w Push [MENU] several times to select M1.
e Push [F4 RTY] to select RTTY menu.
r Push [F4 FIL] to turn the RTTY filter ON.
AGC
DUP
1/4
RTY
SCP
F1
F2
F3
F4
F5
• The RTTY decoder does not function when the RTTY filter is turned OFF.
Push [F4]
t Push [F2 DEC] to turn the RTTY decoder ON.
• RTTY decoder screen appears.
RTTY-FIL ON
DEC
FIL
y Push [F2] to freeze the current screen.
• “H” appears while the function is in use.
u Push [F3] for 1 sec. to clear the displayed characters.
i Push [MENU] to exit the RTTY decoder screen.
F1
SET
F2
F3
F4
F5
F2
F3
F4
F5
Push [F2]
ADJ
F1
Appears while the RTTY decoder screen is freezed
with [F2] operation.
Push [F3] to erase the displayed characters.
• Setting the decoder threshold level
Adjust the RTTY decoder threshold level if some characters are displayed when no signal is received.
q Call up the RTTY decoder screen as described at
above.
w Push [F1 ADJ] to select the threshold level setting
condition.
e Rotate the tuning dial to adjust the RTTY decoder
threshold level.
ADJ
F2
F1
F3
F4
F5
F3
F4
F5
Push [F1]
• Push [F3] for 1 sec. to select the default condition.
r Push [MENU] to exit the RTTY decoder screen.
å
A number of indicating line, the UnShift On Space
(USOS) function and new line code can be set in
the RTTY set mode. (p. 39)
F1
F2
Threshold level indication
38
4
RECEIVE AND TRANSMIT
D RTTY set mode
This set mode is used to set the mark and shift frequencies, keying type, decode USOS function, etc.
• Setting contents
q Push [MENU] to select M1, then push [F4 RTY] to
select the RTTY menu.
w Push [F5 SET] to select RTTY set mode.
e Push [F1≤] or [F2 ≥] to select the desired set item.
r Set the desired condition using the tuning dial.
RTTY
• Push [F3] for 1 sec. to select a default condition or value.
t Push [MENU] 2 times to return to M1.
F1
F2
Mark
2125
F3
F4
F5
Set item up/down
1. RTTY Mark
Sets the mark frequency for RTTY operation.
• 1275, 1615 and 2125 Hz are selectable.
RTTY
Mark
RTTY
Shift
RTTY
Keying
NORMAL
2125
2. RTTY Shift
Sets the shift frequency for RTTY operation.
• 170, 200 and 425 Hz are selectable.
17O
3. RTTY Keying
Selects the keying polarity from normal and reverse.
NORMAL Key open/close = Mark/Space
REVERSE Key open/close = Space/Mark
4. Decode USOS
Turn the USOS (UnShift On Space) function ON/OFF
ON
OFF
Decode as letter code
Decode as character code
Decode
USOS
ON
5. Decode New Line
Selects the new line code of the internal RTTY decoder.
CR: Carriage Return; LF: Line Feed
CR,LF,CR+LF
CR+LF
Decode New Line
CR,LF,CR+LF
CR, LF and CR+LF
CR+LF only
6. Decode Screen
Selects a number of the decoder indication from 2 line
and 3 line.
39
Decode
Screen
3line
RECEIVE AND TRANSMIT
■ Operating AM
q Push a band key to select the desired band.
w Push [AM/FM] to select AM.
e Rotate [AF] to set audio to a comfortable listening
level.
r Rotate the tuning dial to tune a desired signal.
[TRANSMIT]
[TX] indicator
Band keys
[MIC GAIN]
[AM/FM] Tuning dial
• S-meter indicates received signal strength.
• The default tuning step for AM mode is 1 kHz; this can
be changed using tuning step program mode. (p. 21)
t Push [TRANSMIT] or [PTT] (microphone) to transmit.
• The TX indicator lights red.
y Speak into the microphone at your normal voice
level.
Appears
• Adjust [MIC GAIN] at this step, if necessary.
u Push [TRANSMIT] or release [PTT] (microphone) to
return to receive.
D Convenient functions for receive
• Preamp and attenuator (p. 48)
➥ Push [P.AMP/ATT] several times to set the preamp OFF, preamp 1 ON or preamp 2 ON.
• Auto notch filter (p. 53)
➥ Push [A/NOTCH] to turn the auto or manual
notch filter ON and OFF.
• “P.AMP1,” “P.AMP2” or “P.AMP” appears when the
preamp 1, preamp 2 or preamp is set to ON, respectively. (depending on operating frequency band)
• Rotate [NOTCH] control to set attenuate frequency for
manual notch operation.
➥ Push [P.AMP/ATT] for 1 sec. to set the attenuator
ON.
• Push [[p.AMP/ATT] momentarily to turn the attenuator
OFF.
• “ATT” appears when the attenuator is set to ON.
• Noise blanker (p. 51)
➥ Push [NB] to turn the noise blanker ON and OFF.
• “NB” appears when the noise blanker is set to ON.
• Push [NB] for 1 sec. to enter noise blanker set mode.
• Noise reduction (p. 53)
➥ Push [NR] to turn the noise reduction ON and OFF.
• Rotate [NR] control to adjust the noise reduction level.
• “NR” appears when the noise reduction is set to ON.
• IF shift (p. 52)
➥ Rotate [TWIN PBT] controls (inner only).
• Push [PBTC] to clear the settings.
• AGC (auto gain control) (p. 49)
➥ While M1 is selected with [MENU], push [F1
AGC] several times to select AGC F, AGC M,
AGC S or AGC OFF.
• VSC (voice squelch control) (p. 00)
➥ While M2 is selected with [MENU], push
[F5 VSC] to turn the VSC function ON and OFF.
• The VSC indicator appears when the voice squelch
function is set to ON.
D Convenient functions for transmit
• Speech compressor (p. 58)
➥ While M1 is selected with [MENU], push [F3
CMP] to turn the speech compressor ON and
OFF.
• “COMP” appears when the speech compressor is set
to ON.
• VOX (voice operated transmit) (p. 54)
➥ Push [VOX/BK-IN] to turn the VOX function ON
and OFF.
• Transmit quality monitor (p. 57)
➥ Push [MONITOR] to turn the monitor function ON
and OFF.
• “MONI” appears when the monitor function is set to
ON.
• Audio tone control (p. 88)
➥ While M2 is selected with [MENU], push [F4
TCN], select an item with [F1 ≤] and [F2 ≥] then
rotate the tuning dial to adjust the audio tone.
• “VOX” appears when the VOX function is set to ON.
40
4
RECEIVE AND TRANSMIT
■ Operating FM
q Push a band key to select the desired band.
w Push [AM/FM] to select FM.
e Rotate [AF] to set audio to a comfortable listening
level.
r Rotate the tuning dial to tune a desired signal.
[TRANSMIT]
[TX] indicator
Band keys
[MIC GAIN]
[AM/FM] Tuning dial
• S-meter indicates received signal strength.
t Push [TRANSMIT] or [PTT] (microphone) to transmit.
• The TX indicator lights red.
y Speak into the microphone at your normal voice
level.
• Adjust [MIC GAIN] at this step, if necessary.
u Push [TRANSMIT] or release [PTT] (microphone) to
return to receive.
Appear
D Convenient functions for receive
• Preamp and attenuator (p. 48)
➥ Push [P.AMP/ATT] several times to set the preamp OFF, preamp 1 ON or preamp 2 ON.
• “P.AMP1,” “P.AMP2” or “P.AMP” appears when the
preamp 1, preamp 2 or preamp is set to ON, respectively. (depending on operating frequency band)
➥ Push [P.AMP/ATT] for 1 sec. to set the attenuator
ON.
• Push [[p.AMP/ATT] momentarily to turn the attenuator
OFF.
• “ATT” appears when the attenuator is set to ON.
• Noise reduction (p. 53)
➥ Push [NR] to turn the noise reduction ON and OFF.
• Rotate [NR] control to adjust the noise reduction level.
• “NR” appears when the noise reduction is set to ON.
• Auto notch filter (p. 53)
➥ Push [A/NOTCH] to turn the auto or manual
notch filter ON and OFF.
• Rotate [NOTCH] control to set attenuate frequency for
manual notch operation.
• Noise blanker (p. 51)
➥ Push [NB] to turn the noise blanker ON and OFF.
• VSC (voice squelch control) (p. 00)
➥ While M2 is selected with [MENU], push
[F5 VSC] to turn the VSC function ON and OFF.
• “NB” appears when the noise blanker is set to ON.
• Push [NB] for 1 sec. to enter noise blanker set mode.
• The VSC indicator appears when the voice squelch
function is set to ON.
D Convenient functions for transmit
• Speech compressor (p. 58)
➥ While M1 is selected with [MENU], push [F3
CMP] to turn the speech compressor ON and
OFF.
• “COMP” appears when the speech compressor is set
to ON.
• VOX (voice operated transmit) (p. 54)
➥ Push [VOX/BK-IN] to turn the VOX function ON
and OFF.
• “VOX” appears when the VOX function is set to ON.
41
• Transmit quality monitor (p. 57)
➥ Push [MONITOR] to turn the monitor function ON
and OFF.
• “MONI” appears when the monitor function is set to
ON.
• Audio tone control (p. 88)
➥ While M2 is selected with [MENU], push [F4
TCN], select an item with [F1 ≤] and [F2 ≥] then
rotate the tuning dial to adjust the audio tone.
RECEIVE AND TRANSMIT
D Tone squelch operation
Tone squelch operation is a method of communications using selective calling. Only received signal having a matching tone will open the squelch. Before
communicating using tone squelch, all members of
your party must agree on the tone squelch frequency
to use.
q Push [AM/FM] to select FM mode.
w Push [MENU] several times to select M1.
e Push [F4 TON] several times to turn the tone
squelch function ON.
AGC
DUP
CMP
TON
SCP
F1
F2
F3
F4
F5
• “TSQL” appears
r Push [F4 TONE] for 1 sec. to enter tone frequency
set mode.
t Push [F1 TON] several times until TSQL Tone
appears, if necessary.
y Rotate the tuning dial to select the desired tone
squelch frequency.
Push [F4] for 1 sec.
TON
TSQL
SCN
Tone
88.5Hz
• Push [F3] for 1 sec. to select the default frequency.
F1
u Push [MENU] to return to M1.
i Communicate in the usual manner.
• Available tone squelch frequencies
67.0
69.3
71.9
74.4
77.0
79.7
82.5
085.4
088.5
091.5
094.8
097.4
100.0
103.5
107.2
110.9
114.8
118.8
123.0
127.3
131.8
136.5
141.3
146.2
151.4
156.7
159.8
162.2
165.5
167.9
171.3
173.8
177.3
179.9
183.5
186.2
189.9
192.8
196.6
199.5
203.5
206.5
F2
F3
F4
F5
(Unit: Hz)
210.7 254.1
218.1
225.7
229.1
233.6
241.8
250.3
42
4
RECEIVE AND TRANSMIT
D DTCS operation
DTCS function is an another method of communications using selective calling. Only received signal having a matching 3-digit code will open the squelch.
q Push [AM/FM] to select FM mode.
w Push [MENU] several times to select M1.
e Push [F4 TON] several times to turn the DTCS
function ON.
• “DTCS” appears
r Push [F4 TON] for 1 sec. to enter tone frequency
set mode.
t Push [F1 TON] several times until DTCS Code
appears, if necessary.
y Rotate the tuning dial to select the desired DTCS
code number and push [F5] to select the desired
code polarity.
NN : Normal polarity is used for both transmit and
receive.
NR : Normal polarity is used for transmit, reversed
polarity is used for receive.
RN : Reversed polarity is used for transmit, normal
polarity is used for receive.
RR : Reversed polarity is used for both transmit
and receive.
• Push [F3] for 1 sec. to select the default code and polarity.
u Push [MENU] to return to M1.
i Communicate in the usual manner.
• Available tone codes
023
025
026
031
032
036
043
047
051
053
054
065
071
43
072
073
074
114
115
116
122
125
131
132
134
143
145
152
155
156
162
165
172
174
205
212
223
225
226
243
244
245
246
251
252
255
261
263
265
266
271
274
306
311
315
325
331
332
343
346
351
356
364
365
371
411
412
413
423
431
432
445
446
452
454
455
462
464
465
466
503
506
516
523
526
532
546
565
606
612
624
627
631
632
654
662
664
703
712
723
731
732
734
743
754
AGC
DUP
CMP
TON
SCP
F1
F2
F3
F4
F5
Push [F4] for 1 sec.
TON
F1
DTCS
SCN
F2
Code
O23-NN
F3
F4
F5
Select a code with the tuning dial.
Push [F5] to select the polarity
RECEIVE AND TRANSMIT
■ Repeater operation
A repeater amplifies received signals and retransmits
them at a different frequency. When using a repeater,
the transmit frequency is shifted from the receive frequency by an offset frequency. A repeater can be accessed using split frequency operation with the shift
frequency set to the repeater’s offset frequency.
q Push a band key to select the desired band.
w Push [A/B] to select VFO A.
e Push [AM/FM] to select FM.
• Pushing [AM/FM] toggles between AM and FM.
r Rotate the tuning dial to set the repeater transmit
frequency.
t While M1 is selected, push [F2 DUP] several times
to set the offset direction.
AGC
DUP
CMP
TON
SCP
F1
F2
F3
F4
F5
Push [F2], [F4]
• “DUP–” or “DUP+” appears
• 0.100 MHz for HF, 0.500 MHz for 50 MHz and
0.600 MHz for 144 MHz band is set by default in set
mode. (p. 82)
y Push [F4 TON] to turn the repeater tone ON.
• “T” appears.
• Set the tone frequency in tone frequency set mode in
advance, if desired. (p. 45) 88.5 Hz is set by default.
To transmit a 1750 Hz European repeater tone,
push [F4 TON] while transmitting.
u Communicate in the normal way.
AGC
F1
145.O8OOO
DUP CMP TON
F2
F3
F4
SCP
F5
Appear
D One-touch repeater function
This function allow you to set repeater operation with
push of one switch.
➥ To set the transceiver for repeater operation using
the one-touch repeater function, follow the steps q
to r as above, then push [F2 DUP] for 1 sec.
Set the offset shift direction and frequency in advance (p. 82) as well as the tone frequency (see
p. 45).
AGC
DUP
CMP
TON
SCP
F1
F2
F3
F4
F5
Push [F2] for 1 sec.
AGC
F1
145.O8OOO
DUP CMP TON
F2
F3
F4
SCP
F5
Appear
44
4
RECEIVE AND TRANSMIT
D Transmit frequency monitor check
You may be able to receive the other party’s transmit
signal directly without having to go through a repeater.
This function allows you to check this.
➥ While receiving, push and hold [XFC] to see if you
can receive the other party’s transmit signal directly.
• While holding [XFC], the offset direction and frequency
are displayed on the multi-function switch indicator.
[XFC]
AGC
-6OO.Ok
DUP CMP TON
TON
Rptr
SCN
SCP
D Repeater tone frequencies
The transceiver’s repeater tone frequency is set to
88.5 Hz by default. This can be changed if desired.
q While M1 is selected, push [F4 TON] to turn the
tone encoder ON.
• “T” appears.
w Push [F4 TON] for 1 sec. to select the tone frequency set mode.
e Push [F1 TON] several times to select Rptr
Tone, if necessary.
r Rotate the tuning dial to select the desired frequency. (see the table at right)
t Push [MENU] to return to M1.
Tone
88.5Hz
• Available tone frequencies
67.0
69.3
71.9
74.4
77.0
79.7
82.5
085.4
088.5
091.5
094.8
097.4
100.0
103.5
107.2
110.9
114.8
118.8
123.0
127.3
131.8
136.5
141.3
146.2
151.4
156.7
159.8
162.2
165.5
167.9
171.3
173.8
177.3
179.9
183.5
(Unit: Hz)
186.2
189.9
192.8
196.6
199.5
203.5
206.5
210.7 254.1
218.1
225.7
229.1
233.6
241.8
250.3
D Storing a non standard repeater
q Turn the auto repeater function OFF in the set
mode. (p. 83)
w Push [AM/FM] to select FM mode.
e Push [V/M], then [A/B] to select VFO A.
r Rotate the tuning dial to set the repeater output frequency.
[V/M]
[MW]
• Set the tuning step if desired.
t Push [A/B] to select VFO B.
y Rotate the tuning dial to set the repeater input frequency.
u Push [A/B] to select VFO A.
i Push [SPLIT] to turn the split function ON.
o Push [F4 TON] to turn the previously set tone encoder ON.
!0 Rotate [M-CH] to select the desired memory channel.
• “BLANK” appears when blank channel is selected.
!1 Push [MW] for 1 sec. to store the contents in the selected memory channel.
45
[AM/FM] [SPLIT] [A/B] [M-CH]
RECEIVE AND TRANSMIT
D Auto repeater function
This function automatically activates the repeater settings (DUP– or DUP+ and/or tone encoder ON/OFF)
when the operating frequency falls within the general
repeater output frequency range and deactivates them
when outside of the range.
Set the auto repeater function ON-1 or ON-2 in set
mode in advance (p. 83). When set ON-1 or ON-2, repeater settings are automatically activated according
to the table below.
Auto
18
Repeater
ON-1
Auto
18
Repeater
ON-2
Auto
18
Repeater
OFF
ON-1 automatically set the duplex setting and ON-2
automatically sets the duplex setting and tone encoder
automatically.
• Frequency range and offset direction
FREQUENCY RANGE
DUPLEX DIRECTION
145.200–145.495 MHz
minus duplex
146.610–146.995 MHz
minus duplex
147.000–147.395 MHz
plus duplex
46

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Modify Date                     : 2001:12:06 13:06:47
Title                           : 746PRO_INSTRUCTION_MANUAL(EN.pd.PDF
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