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

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Document ID	183823
Application ID	yEvnFMiSfENvC1jlBuV6DA==
Document Description	Manual Part 2
Short Term Confidential	No
Permanent Confidential	No
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Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	203.85kB (2548117 bits)
Date Submitted	2001-12-15 00:00:00
Date Available	2001-12-15 00:00:00
Creation Date	2001-12-06 13:07:43
Producing Software	Acrobat Distiller 3.0J (Windows 版)
Document Lastmod	2001-12-06 13:08:35
Document Title	746PRO_INSTRUCTION_MANUAL(EN.pd.PDF
Document Author:	MasaakiT

FUNCTIONS FOR RECEIVE
■ Simple band scope
The band scope function allows you to visually check
signal condition around a specified frequency. The IC746PRO’s band scope function can be used in any operating mode and frequency band.
STEP
0.5k
Sweep indicator
Band scope indicator
Frequency indicator mark
Sweep step indicator
INDICATOR
DESCRIPTION
Sweep
While the band scope is “sweeping,” “
” appears; while stopped “
” appears. Received
audio is not emitted from the speaker while the band scope is “sweeping.”
Indicates the relative strength of signals and their location in relation to the center (displayed)
Band scope in- frequency. Signal strength is relative to the S-meter level, S1 to S9, with each vertical dot in the
dicator
band scope indicator equal to one segment of the S-meter. Signal activity is measured ±30
steps from the center frequency with each step equal to the selected sweep step.
Frequency
indicator mark
After a sweep, indicates the relative position of the selected frequency. When the selected frequency is outside of the sweep range, “ ” or “ ” indicator flashes. After changing the frequency, push [F3] for 1 sec. to automatically return to the center frequency.
Sweep step
Indicates the selected sweep step. 0.5, 1, 2, 5, 10, 20 and 25 kHz are selectable. Each dot of
the band scope indication is approx. equal to the selected sweep step.
The band scope measures receive signal conditions
over a specified range on either side of a selected frequency in either VFO or memory modes.
q Rotate the tuning dial to tune a frequency.
w While M1 is selected, push [F5 SCP] to select the
band scope menu.
• Starts sweeping automatically with the previously selected sweeping step.
• During sweep, received signals cannot be heard.
e Push [F5 STEP] several times to select the desired
sweep step.
r Push [F1] to start sweeping, then stop automatically
after sweeping.
• Push [F1] for 1 sec. to start continuous sweeping. In this
case, it is necessary to push [F1] to stop sweeping.
• During sweep operation “
” appears and received
signals cannot be heard.
• If there is a lot of signal noise, turn the preamp OFF and
the attenuator ON to reduce the signal input level and
improve the readability of the band scope.
STEP
O.5k
F1
F2
F3
Sweep start/stop
F4
Sweep step selection
t When rotating the tuning dial and finding a signal
you wish to communicate on, simple communicate
normally.
• If you want to return to the previous frequency (before
rotating the tuning dial), push [F3] for 1 sec.
• If the selected frequency is set outside of the sweeped
range, “ ” or “ ” flashes.
y While receiving, if you want to update the band conditions, repeat steps e and r as above.
47
F5
STEP
O.5k
F1
F2
Sweep indicator
F3
F4
F5
FUNCTIONS FOR RECEIVE
■ Preamp/Attenuator
The preamp amplifies received signals in the front end
circuit to improve the S/N ratio and sensitivity. Set this
to preamp 1 or preamp 2 when receiving weak signals.
The attenuator prevents a desired signal from distortion when very strong signals are near the desired frequency or when very storing electric fields, such as
from broadcasting station, are near your location.
These can both set independently for each band.
➥ Push [P.AMP/ATT] several times to set the preamp
OFF, preamp 1 ON or preamp 2 ON.
• When the preamp is ON, either “P.AMP 1” or
“P.AMP 2” appears in the function display.
• When operating on the 144 MHz band, the preamp can
only be set to ON or OFF only— there is no preamp 1
and preamp 2.
Regular preamp, the most effective for 1.8 to
21 MHz bands without IMD corruption.
High-gain preamp, the most effective for 24
to 50 MHz bands.
[P.AMP/ATT]
Push
Push
P.AMP/ATT
P.AMP/ATT
Push
P.AMP/ATT
Push
Push
P.AMP/ATT
for 1sec.
P.AMP/ATT
Preamp activates for the VHF band (144 to
146 MHz range; 108 to 174 for the USA version).
➥ Push [P.AMP/ATT] for 1 sec. to set the attenuator ON.
• “ATT” appears ni the display when the function is set ON.
• Push [P.AMP/ATT] momentarily to set the attenuator OFF.
Regarding the use of the “P.AMP 2”
The “P.AMP 2” is a high gain receive amplifier. When the
“P.AMP 2” is used during times of strong electric fields, distortion sometimes results. In such cases, use the transceiver with the “P.AMP 1” or “P.AMP OFF” setting.
The “P.AMP 2” is most effective when:
• Used on bands above 24 MHz and when electric fields are
weak.
• Receive sensitivity is insufficient during low gain, or while
using a narrow band antenna (such as small loop, a Beverage antenna or a short Yagi antenna, etc.) is used.
■ RIT function
The RIT (Receive Increment Tuning) function compensates for off-frequencies of the communicating station.
The function shifts the receive frequency up to
±9.99 kHz in 10 Hz steps without moving the transmit
frequency.
[CLEAR]
• See #0 on p. 4 for function description.
q Push [RIT] to turn the RIT function ON and OFF.
• “RIT” and the shifting frequency appear when the function is ON.
w Rotate the [RIT/∂TX] control.
[RIT] [RIT/∂TX] control
• Push [CLEAR] for 1 sec. to reset the RIT frequency.
• Push [CLEAR] momentarily to reset the RIT frequency
when the quick RIT/∂TX clear function is ON. (p. 85)
• Push [RIT] for 1 sec. to add the shift frequency to the operating frequency.
D RIT monitor function
When the RIT function is ON, pushing and holding
[XFC] allows you to monitor the operating frequency
directly (RIT is temporarily cancelled).
appear
48
5
FUNCTIONS FOR RECEIVE
■ AGC function
The AGC (auto gain control) controls receiver gain to
produce a constant audio output level even when the
received signal strength is varied by fading, etc.
The transceiver has 3 AGC characteristics (time constant; fast, mid, slow) for non-FM mode.
The FM mode AGC time constant is fixed as ‘FAST’
(0.1 sec.) and AGC time constant cannot be selected.
[F1 AGC] Mode switches
D AGC speed selection
: Medium AGC speed
q Select non-FM mode.
w While M1 is selected, push [F1 AGC] several times
to select AGC F, AGC M, AGC S or AGC OFF.
: Slow AGC speed
: Fast AGC speed
“AGC OFF” appears when AGC time constant OFF
is set with one of FAST, MID or SLOW setting in
AGC set mode.
: AGC does not activated
D Setting the AGC time constant
q Select the desired mode except FM mode.
w While M1 is selected, push [F1 AGC] for 1 sec. to
enter AGC set mode.
e Push one of [F2 FAST], [F3 MID] or [F4 SLOW] to select the desired AGC speed to be set.
• Underline appears below the time constant indication.
r Rotate the tuning dial to set the desired time constant.
• AGC time constant can be set between 0.1 to 8.0 sec.
(depends on mode) or turned OFF.
• Push [F2 FAST], [F3 MID] or [F4 SLOW] for 1 sec. to select a default value for each fast, mid. and slow, respectively.
AGC
DUP
CMP
TBW
SCP
F1
F2
F3
F4
F5
F3
F4
F5
t Select another mode except FM. Repeat steps e
and r if desired.
y Push [MENU] to exit the AGC set mode.
• Selectable AGC time constant
Mode
Default
(unit: sec.)
Selectable AGC time constant
SSB
0.3 (FAST)
OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6
2.0 (MID)
2.0, 2.5, 3.0, 4.0, 5.0, 6.0
6.0 (SLOW)
CW
0.1 (FAST)
OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6
0.5 (MID)
2.0, 2.5, 3.0, 4.0, 5.0, 6.0
1.2 (SLOW)
0.1 (FAST)
OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6
RTTY 0.5 (MID)
2.0, 2.5, 3.0, 4.0, 5.0, 6.0
1.2 (SLOW)
49
AM
3.0 (FAST)
OFF, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0, 2.5
5.0 (MID)
3.0, 4.0, 5.0, 6.0, 7.0, 8.0
7.0 (SLOW)
FM
0.1 (FAST)
Fixed
Push [F1] for 1 sec.
F1
F2
Appears under the selected AGC
speed’s time constant indication.
Selected mode
• When AGC fast is selected
F1
F2
F3
F4
F5
Push [F2] for 1 sec. to select the default value in
this case.
FUNCTIONS FOR RECEIVE
■ IF filter selection
The transceiver has 3 passband width IF filters for
each mode.
For SSB and CW modes, the passband width can be
set within 50 to 3600 Hz in 50 or 100 Hz steps. A total
of 41 passband widths are available.
For RTTY mode, the passband width can be set within
50 to 2700 Hz in 50 or 100 Hz steps. A total of 32
passband widths are available.
For AM and FM modes, the passband width is fixed
and 3 passband widths are available independently.
The filter selection is automatically memorized in
each mode.
The PBT shift frequencies are automatically memorized in each filter.
[FILTER]
D IF filter selection
q Select the desired mode.
w For RTTY mode, turn OFF the RTTY filter.
e Push [FILTER] several times to select the IF filter
1, 2 or 3.
• The selected passband width and filter number is displayed in the LCD.
AGC
DUP
CMP
TBW
SCP
The selected filter width is indicated
for approx. 1 sec. when [FILTER] is
Filter selection
pushed.
By pushing [PBTC] indicate the set filter passband
width, “B,” and shifting value “S.”
D Filter passband width setting (SSB, CW and RTTY mode only)
q Select SSB, CW or RTTY mode.
• Passband widths for AM and FM modes are fixed and
cannot be set.
w For RTTY mode, turn OFF the RTTY filter.
e Push [FILTER] for 1 sec. to enter filter set mode.
r Push [FILTER] several times to select the desired
IF filter number.
t While pushing [F1 BW], rotate the tuning dial to set
the desired passband width.
• In SSB and CW modes, the passband width can be set
within the following range.
50 to 500 Hz
50 Hz steps
600 to 3600 Hz
100 Hz steps
• In RTTY mode, the passband width can be set within the
following range.
50 to 500 Hz
50 Hz steps
600 to 2700 Hz
100 Hz steps
• Push [F-3] for 1 sec. to select the default value.
y Repeat steps r to t if desired.
u Push [MENU] to exit the filter set mode.
• Filter set mode indication
BW
Shows the selected filter and passband width.
• Indication while setting
BW
Reverses
Appears
While pushing [F1 BW], rotate the tuning dial to set
passband width.
The PBT shift frequencies are cleared when the
passband width is changed.
This filter set mode screen graphically displays the
PBT shift frequencies and CW pitch operations.
50
5
FUNCTIONS FOR RECEIVE
■ IF (DSP) filter shape
The type of IF (DSP) filter shape for each SSB and
CW can be selected independently from soft and
sharp.
q Push [SSB] or [CW/RTTY] to select SSB, CW or
RTTY mode.
w Select the filter set mode.
BW
• Push [FILTER] for 1 sec.
• Operating mode can be selected in this step.
e Push [FILTER] several times to select the desired
IF filter.
r Push the [F5] to select the filter shape from “SOFT”
and “SHARP.”
t Push [MENU] to exit the set mode.
Push [F5]
BW
■ Noise blanker
The noise blanker eliminates pulse-type noise such as
from car ignitions. The noise blanker is not available
for FM mode.
q Push [NB] to turn the noise blanker ON.
• [NB] indicator appears.
w Push [NB] for 1 sec. to enter the NB level set mode.
e Rotate the tuning dial to adjust the noise blanker
level.
[NB]
“NB” appears while noise blanker is activated.
• Noise blanker level is indicated with bar meter and digit
in ‘%.’
r Push [NB] to exit the noise blanker set mode.
t Push [NB] to turn the noise blanker OFF.
NB
Level
5O%
• [NB] indicator disappears.
When using the noise blanker, received signals may
be distorted if they are excessively strong.
Shows noise blanker level
■ Meter peak hold function
The S-meter shows the peak level holding function.
Peak level of receiving signal strength is indicated for
0.5 sec. (approx.). This function can be deactivated in
the set mode if desired. (p. 81)
Meter
Peak
Shows peak level for approx. 0.5 sec.
51
Hold
ON
FUNCTIONS FOR RECEIVE
■ Twin PBT operation
General PBT (Passband Tuning) function electronically
narrows the IF passband width by shifting the IF frequency to slightly outside of the IF filter passband to
reject interference. This transceiver uses the DSP circuit for the PBT function. Moving both [TWIN PBT]
controls to the same position shifts the IF.
[TWIN PBT] control
➥ The LCD shows the passband width and shift frequency graphically.
➥ Push [FILTER] for 1 sec. to enter the filter set mode.
Current passband width and shift frequency is displayed in the filter set mode screen.
➥ To set the [TWIN PBT] controls to the center positions, push [PBTC] for 1 sec.
The variable range depends on the passband width
and mode. The edge of the variable range is half of the
passband width, and PBT is adjustable in 25 or 50 Hz
steps. 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.
IF shift is adjustable in 20/40 Hz steps in RTTY (RTTY
filter is turned ON) or 150/300/500 Hz steps in AM.
• [TWIN PBT] should normally be set to the center positions (PBT setting is cleared) when there is no interference.
• When PBT is used, the audio tone may be changed.
• Not available for FM mode.
• For AM and RTTY (with RTTY filter ON) modes,
[TWIN PBT] inner control can only be activated, and
functions as an IF shift function.
• While rotating [TWIN PBT], noise may occur. This comes
from the DSP unit and does not indicate an equipment
malfunction.
• By pushing [PBTC] momentarily, indicate the using filter
passband width, “B,” and shifting value, “S.”
[PBTC]
AGC
DUP
CMP
TBW
SCP
Passband width and shifting value are
indicated while [TWIN PBT] is operated.
Appears when PBT is used.
• 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.
PBT OPERATION EXAMPLE
Center
Passband
Passband
IF shift
pass band
IF center frequency
interference
desired signal inteference desired signal
IF center freq. interference
52
5
FUNCTIONS FOR RECEIVE
■ Noise reduction
The noise reduction function reduces noise components and picks out desired signals which are buried
in noise. The received signals are converted to digital
signals and then the desired signals are separated
from the noise.
q Push the [NR] switch to turn the noise reduction
ON.
• “NR” appears.
w Rotate the [NR] control to adjust the noise reduction
level.
e Push the [NR] switch to turn the noise reduction
OFF.
[NR]
[NR]
AGC
DUP
• “NR” disappears.
Deep rotation of the [NR] control results in audio signal masking or distortion. Set the [NR] control for
maximum readability.
CMP
TBW
SCP
Appears
■ Notch function
This transceiver has auto and manual notch functions.
The auto notch function automatically attenuates more
than 3 beat tones, tuning signals, etc., even if they are
moving. The manual notch can be set to attenuate a
frequency via the [NOTCH] control.
➥ Push [A/NOTCH] to toggle the notch function between auto, manual and OFF in SSB and AM
modes.
➥ Push [A/NOTCH] to turn the manual notch function
ON and OFF in CW mode.
➥ Push [A/NOTCH] to turn the auto notch function ON
and OFF in FM mode.
• Set to attenuate a frequency for manual notch via the
[NOTCH] control.
• “A NOTCH” appears when auto notch is in use.
• “NOTCH” appears when manual notch is in use.
[A/NOTCH] [NOTCH]
AGC
DUP
CMP
TBW
SCP
Notch function indicators
While operating the manual notch, noise may be
heard. This comes from the DSP unit and does not
indicate an equipment malfunction.
■ Dial lock function
The dial lock function prevents accidental changes
caused by the tuning dial.
Lights while the dial lock function is activated.
➥ Push [LOCK/SPCH] to turn the dial lock function ON
and OFF.
• “LOCK” indicator lights while the dial lock function is activated.
[LOCK/SPCH]
53
FUNCTIONS FOR RECEIVE
■ Voice squelch control function
This function is useful when you don’t want unmodulated signals. When the voice squelch control function
is activated, the receiver checks received signals for
voice components.
VSC indicator
If a receiver signal includes voice components, and the
tone of the voice components changes within 1 sec.,
squelch opens. If the received signal includes no voice
components or the tone of the voice components does
not change within 1 sec., squelch closes.
➥ While M2 is selected with [MENU], push [F5 VSC]
to switch the VSC (Voice Squelch Control) function
ON and OFF.
SCN
MEM
SWR
TCN
VSC
F1
F2
F3
F4
F5
• “VSC” appears when the function is activated.
• The VSC function activates for phone modes
(SSB, AM and FM).
• The VSC function can also be used for scanning
operation in AM or FM mode (p. 00).
Push [F5] to turn the VSC function ON and OFF.
54
6
FUNCTIONS FOR TRANSMIT
■ VOX function
The VOX (Voice-Operated Transmission) function
switches between transmit and receive with your voice.
This function provides an opportunity to input log entries into your computer, etc., while operating.
• Using the VOX function
q Select a phone mode (SSB, AM, FM).
w Push [VOX/BK-IN] to turn the VOX function ON or
OFF.
[VOX/BK-IN]
AGC
DUP
CMP
VOX
Gain
TBW
SCP
Appears
D Adjusting the VOX function
q Select a phone mode (SSB, AM, FM).
w Push [VOX/BK-IN] to turn VOX function ON.
e Push [VOX/BK-IN] for 1 sec. to enter VOX set
mode.
r Select the VOX Gain item using [F1 ≤] or [F2 ≥].
t While speaking into the microphone, rotate the tuning dial to the point where the transceiver is continuously transmitting.
F1
F2
F3
F4
F5
Shows VOX gain level
Anti-VOX
- Pushing [F3] for 1 sec. to select the default value.
y Push [F2 ≥] to select Anti-VOX item.
u While receiving, rotate the tuning dial to the point
where the transceiver does not switch to transmit
with the speaker output.
5O%
F1
F2
F3
5O%
F4
F5
Shows anti-VOX gain level
- Pushing [F3] for 1 sec. to select the default value.
y Push [F2 ≥] to select VOX Delay item.
y Adjust the VOX delay for a convenient interval before returning to receive.
- Select the VOX delay item using the tuning dial.
- Pushing [F3] to select the default value.
u Push [MENU] to return to previous indication.
55
VOX
F1
Delay
F2
Shows VOX delay time
O.2s
F3
F4
F5
FUNCTIONS FOR TRANSMIT
■ Break-in function
The break-in function is used in CW mode to automatically toggle the transceiver between transmit and receive when keying. The IC-746PRO is capable for full
break-in or semi break-in.
[VOX/BK-IN]
D Semi break-in operation
During semi break-in operation, the transceiver selects
transceive when keying, then automatically returns to
receive after a pre-set time from when you stop keying.
q Push [CW/RTTY] to select CW or CW-R mode.
w Push [VOX/BK-IN] several times to turn the semi
break-in function ON.
• “BK-IN” appears.
e Set the break-in delay time (the delay from transmit
to receive).
➥ Push [VOX/BK-IN] for 1 sec. to select break-in
delay program mode.
➥ Rotate the tuning dial to select the desired delay.
• Push [F3] for 1 sec. to select to the default value.
Break-IN
Delay
7.5d
Break-in indicator
Shows break-in delay time
r Push [MENU] to return to the previous menu.
When using a paddle, rotate [KEY SPEED] to adjust
the keying speed.
D Full break-in operation
During full break-in operation, the transceiver automatically selects receive if a signal is detected while keying.
q Push [CW/RTTY] to select CW or CW-R mode.
w Push [VOX/BK-IN] several times to turn the full
break-in function ON.
• “FBK-IN” appears.
When using a paddle, rotate [KEY SPEED] to adjust
the keying speed.
AGC
DUP
1/4
KEY
SCP
Full break-in indicator
56
6
FUNCTIONS FOR TRANSMIT
■ ∂TX function
The ∂TX function shifts the transmit frequency up to
±9.99 kHz in 10 Hz steps without moving the receive
frequency.
[CLEAR]
• See #2 on p. 4 for function description.
q Push the [∂TX] switch to turn the ∂TX function ON
and OFF.
• “∂TX” and shift frequency appear when the function is
ON.
w Rotate the [RIT/∂TX] control.
• To reset the ∂TX frequency, push [CLEAR] for 1 sec.
• Push [CLEAR] momentarily to reset the RIT frequency
when the quick RIT/∂TX clear function is ON. (p. 00)
• To add or subtract the ∂TX frequency to the displayed
frequency, push [∂TX] for 1 sec.
[∂TX] [RIT/∂TX] control
When RIT and ∂TX are ON at the same time, the
[RIT/∂TX] control shifts both the transmit and receive frequencies from the displayed frequency at
the same time.
appear
D ∂TX monitor function
When the ∂TX function is ON, pushing and holding
[XFC] allows you to monitor the operating frequency directly (∂TX is temporarily cancelled).
■ Monitor function
The monitor function allows you to monitor your transmit IF signals in any mode through the speaker. Use
this to check voice characteristics while adjusting SSB
transmit tones. (p. 88) The CW sidetone functions regardless of the [MONITOR] switch setting.
q Push [MONITOR] to switch the monitor function ON
and OFF.
• “MONI” appears when the monitor function is ON.
w Set the monitor level.
➥ Push [MONITOR] for 1 sec. to select monitor program mode.
➥ Rotate the tuning dial for the clearest audio output while pushing [PTT] and speaking into the microphone.
[MONITOR]
• Push [F3] for 1 sec. to select the default value.
r Push [MENU] to return to the previous menu.
MONITOR
Monitor indicator
Shows monitor level
57
Level
5O%
FUNCTIONS FOR TRANSMIT
■ Speech compressor
The speech compressor increases average RF output
power, improving signal strength and readability in
SSB, AM or FM.
When adjusting the compression level, it is necessary
to turn the COMP meter ON in the set mode, in advance (p. 81).
• In SSB mode
q Select USB or LSB mode and adjust [MIC GAIN] to
a suitable level.
w While M1 is selected, push [F3 CMP] to turn the
speech compressor ON.
• “COMP” appears.
e Push [F3 CMP] for 1 sec. to select compression
level set mode.
r While speaking into the microphone, rotate the tuning dial, so that the COMP meter reads within the
COMP zone with your normal voice level.
• Push [F3] for 1 sec. to select the default value.
When the COMP meter peaks above the COMP
zone, your transmitted voice may be distorted.
t Push [MENU] to return to M1.
COMP
Compressor indicator
Shows compression level
ALC meter
COMP meter
COMP level zone
*The SWR meter functions as the COMP meter
when COMP meter is set to ON in the set mode.
• In AM/FM mode
q While M1 is selected, push [F3 CMP] to turn the
speech compressor ON.
COMP
• “COMP” appears.
w Push [F3 CMP] for 1 sec. and set the compression
level as “1” in advance.
e While speaking into the microphone, rotate [MIC
GAIN], so that the COMP meter does not exceeds
the center dot whether you speak softly or loudly.
r While speaking into the microphone, rotate the tuning dial, so that the COMP meter reads within the
COMP zone with your normal voice level.
• Push [F3] for 1 sec. to select the default value.
When the COMP meter peaks above the COMP
zone, your transmitted voice may be distorted.
Level
Level
Adjust [MIC GAIN], so that the COMP meter does
not exceeds this zone.
Adjust the COMP Level with the tuning dial so
that the COMP meter does not exceeds the COMP
level zone.
t Push [MENU] to return to M1.
■ Transmit filter width selection (SSB mode only)
The transmit filter width for SSB mode can be selected
from wide, middle and narrow.
q Select USB or LSB mode.
w Push [MENU] to select M1, if necessary.
e Push [F4 TBW] for 1 sec. to select the transmission
passband width.
• One of “TX BW=WIDE,” “TX BW=MID” or “TX
BW=NAR” is displayed for approx. 1 sec.
• Transmit filter width: NAR
2.0 kHz
MID
2.6 kHz
WIDE 2.9 kHz
AGC
DUP
CMP
TBW
SCP
F1
F2
F3
F4
F5
Push [F4]
TX BW=WIDE
AGC DUP CMP TBW
F1
F2
F3
F4
SCP
F5
The selected transmit filter width
is displayed for approx. 1 sec.
Push [F4] for 1 sec. to select the transmit filter width.
58
6
FUNCTIONS FOR TRANSMIT
■ Split frequency operation
Split frequency operation allows you to transmit and
receive in the same mode on two different frequencies.
The split frequency operation is basically performed
using 2 frequencies in VFO A and VFO B.
[SPLIT] Lights during split operation
The following is an example of setting 21.290 MHz for
receiving and 21.310 MHz for transmitting.
q Set 21.290 MHz (USB) in VFO A.
w Push [SPLIT] to turn the split function ON, then
push [A/B] for 1 sec.
[XFC] Tuning dial
[A/B]
• The equalized transmit (VFO B) frequency and “SPLIT”
appear on the LCD, and the [SPLIT] indicator lights.
e While pushing [XFC] rotate the tuning dial to set the
transmit frequency to 21.310 MHz.
• The transmit frequency can be monitored while pushing
[XFC].
r Now you can receive on 21.290 MHz and transmit
on 21.310 MHz.
To change the transmit and receive frequencies, push
[A/B] to exchange the VFO A and VFO B.
AGC
21.29OOO
DUP CMP TBW
Shows transmit (VFO B) frequency
CONVENIENT
SCP
Appears
• While pushing [XFC]
• Direct shift frequency input
The shift frequency can be entered directly.
q Push [F-INP].
w Enter the desired shift frequency with the digit
keys.
• 1 kHz to 1 MHz can be set.
• When you require a minus shift direction, push
[GENE • ] in advance.
e Push [SPLIT].
• The shift frequency is input in the sub readout and the
split function is turned ON.
[Example]
To transmit on 1 kHz higher frequency:
- Push [F-INP], [1.8 1] then [SPLIT].
To transmit on 3 kHz lower frequency:
- Push [F-INP], [GENE • ], [7 3] then [SPLIT].
• Split lock function
Accidentally releasing the [XFC] switch while rotating
the tuning dial changes the receive frequency. To prevent this, use both the split lock and dial lock functions to change the transmit frequency only. The split
lock function cancels the dial lock function while
pushing [XFC] during split frequency operation.
The dial lock’s effectiveness during split frequency
operation can be selected in the set mode for both
receive and transmit frequencies; or only the receive
frequency. (p. 82)
59
AGC
+2O.OOk
DUP CMP TBW
SCP
Shows shift frequency and direction
Shows transmit (VFO B) frequency
• After setting up
AGC
21.31OOO
DUP CMP TBW
SCP
FUNCTIONS FOR TRANSMIT
■ Quick split function
When you push the [SPLIT] switch for 1 sec., split frequency operation is turned ON, the un-displayed VFO
is automatically changed according to the plus/minus
shift frequency programmed in set mode (p. 82) or
equalized when 0 kHz (default value) is programmed
as the split shift frequency. Quick split operation is
turned ON by default but can be turned OFF in set
mode (p. 82).
q Suppose you are operating at 21.290 MHz (USB) in
VFO A.
w Push [SPLIT] for 1 sec.
• Split frequency operation is turned ON.
• The VFO and VFO B are equalized.
• Setting the frqeuency while pushing [XFC]
AGC
+2O.OOk
DUP CMP TBW
SCP
Shows shift frequency and direction
e While pushing [XFC], rotate the tuning dial to set
the frequency offset between transmit and receive.
• When [XFC] is released, the receive frequency is indicated.
D Split offset frequency setting
By setting an often-used split frequency offset in advance, you can use the quick split function to select split
operation at the push of one switch.
SPLIT
12
Offset
+O.O2OMHz
Set the split offset frequency in advance in set mode
(p. 82, item 12). The example at right shows the split
offset is set to +0.020 MHz.
➥ Push [SPLIT] for 1 sec. to activate the quick split
function.
• The transmit frequency is offset from the receive frequency according to the offset in set mode.
AGC
21.31OOO
DUP CMP TBW
SCP
Shows transmit frqeuency for split operation
D Split lock function
The split lock function is convenient for changing only
the transmit frequency. When the split lock function is
not used, accidentally releasing [XFC] while rotating the
tuning dial, changes the receive frequency. The split
lock function is ON by default, but can be turned OFF
in set mode.
SPLIT
13
LOCK
OFF
q While split frequency operation is ON, push
[LOCK/SPCH] to activate the split lock function.
w While pushing [XFC], rotate the tuning dial to
change the transmit frequency.
• If you accidentally release [XFC] while rotating the tuning
dial, the receive frequency does NOT change.
[XFC]
Tuning dial [LOCK/SPCH]
60
6
FUNCTIONS FOR TRANSMIT
■ Measuring SWR
The IC-746PRO has a built-in circuit for measuring antenna SWR— no external equipment or special adjustments are necessary.
The IC-746PRO can measure SWR in 2 ways— spot
measurement and plot measurement are available.
D Spot measurement
q Push [TUNER] to turn the antenna tuner OFF.
w Turn the COMP meter OFF.
• Push [MENU] for 1 sec. to enter set mode.
• Push [F1 ≤] or [F2 ≥] several times to select the COMP
Meter item.
• Rotate the tuning dial to set the COMP meter OFF.
• Push [MENU] to exit set mode.
e Push [CW/RTTY] several times to select RTTY
mode.
r Push [TRANSMIT] or [PTT] of the microphone.
t Rotate [RF PWR] clockwise past the 12 o’clock position for more than 30 W output power (30%).
y Read the SWR on the SWR meter.
u Push [TRANSMIT] or release [PTT] to receive.
The built-in antenna tuner matches the transmitter
to the antenna when the SWR is lower than 3:1.
AGC
DUP
1/4
RTY
SCP
The best match is in this range.
D Plot measurement
Plot measurement allows you to measure the SWR
over an entire band.
SCN
MEM
SWR
TCN
VSC
q While M2 is selected with [MENU], push [F3 SWR].
F1
F2
F3
F4
F5
• SWR graph screen appears.
w Rotate [RF PWR] clockwise past the 12 o’clock position for more than 30 W output power (30%).
e Set the center frequency for the SWR to be measured.
r Push [F5] for 1 sec. several times to select the desired measuring step from 10, 50, 100 and 500 kHz.
t Push [F3] several times to select the desired number of measuring steps from 3, 5, 7, 9, 11 and 13
steps.
y Push [F1] to start the measuring.
u Push [TRANSMIT] or push and hold [PTT] of the
microphone to measure the SWR.
• Frequency marker, “∫,” appears below SWR graph.
• RTTY mode is automatically selected.
i When pushing [TRANSMIT] again or release [PTT],
the frequency marker and frequency indication
move to the next frequency to be measured.
o Repeat steps u and i to measure SWR over the
entire frequency range.
!0 When the measured SWR is less than 1.5:1, the
antenna is well matched with the transceiver in the
measured frequency range.
Push [F3]
STEP
1Ok
F1
F2
Push [F1] to start
measuring.
F3
F4
F5
Push [F5] to select
SWR measuring step.
Push [F3] to select number of SWR measuring steps.
• Measuring (after pushing [F1])
STEP
1Ok
Frequency marker appears and moves after measurement.
*When mesurement point/s is/are set outside of the operatable frequency band, frequency marker flashes.
— 4.0:1
— 3.0:1
— 2.0:1
— 1.5:1
— 1.0:1
Typical display SWR varying between 1 and 2,
full scale up to SWR 4.0:1.
61
MEMORY OPERATION
■ Memory channels
The transceiver has 101 memory channels (plus 1 call
channel). The memory mode is very useful for quickly
changing to often-used frequencies.
All 101 memory channels are tuneable which means
the programmed frequency can be tuned temporarily
with the tuning dial, etc. in memory mode.
MEMORY
CHANNEL
MEMORY
CHANNEL
NUMBER
CAPABILITY
TRANSFER
TO VFO
OVERWRITING
CLEAR
Regular memory
channels
1–99
One frequency and one mode
in each memory channel.
Yes
Yes
Yes
Scan edge
memory
channels
P1, P2
One frequency and one mode in
each memory channel as scan
edges for programmed scan.
Yes
Yes
No
Call channel
Same as regular.
No
Yes
No
■ Memory channel selection
D In VFO mode
q Push [V/M] to select VFO mode, if necessary, then
rotate [M-CH] to select a memory channel number.
• All memory channels including blank channels can be
selected.
• “BLANK” appears when no information has been programmed into a memory channel.
w Push [V/M] to select memory mode.
• “MEMO” and contents of the memory channel appear.
D In memory mode
q Push [V/M] to select memory mode.
w Rotate [M-CH] to select a memory channel.
[V/M]
[M-CH]
• During VFO mode
• All memory channels including blank channels can be
selected.
• Memory channels can also be selected using the microphone [UP]/[DN] keys.
Disappears when a channel is programmed.
• During memory mode
62
7
MEMORY OPERATION
■ Programming a memory
Memory channel programming can be preformed either in VFO mode or in memory mode.
[MW]
D Programming in VFO mode
q Set the desired frequency and operating mode in
VFO mode.
w Rotate [M-CH] to select the desired memory channel.
• “BLANK” appears if the selected memory channel is a
blank channel (and does not have contents).
e Push [MW] for 1 sec. to program the displayed frequency and operating mode into the memory channel.
• 3 beeps are emitted when memory programming is successful.
[V/M]
[M-CH]
• [EXAMPLE]: Programming 7.088 MHz/LSB
into memory channel 12.
D Programming in VFO mode
q Select the desired memory channel with [M-CH] in
memory mode.
• Memory channel contents appear in the display.
• “BLANK” appears and no frequency readout is displayed
if the selected memory channel is a blank channel (and
does not have contents).
w Set the desired frequency and operating mode in
memory mode.
• To program a blank channel, use direct frequency entry
with the keypad or memo pads, etc.
e Push [MW] for 1 sec. to program the displayed frequency and operating mode into the memory channel.
AGC
DUP
CMP
TBW
SCP
• [EXAMPLE]: Programming 21.280 MHz/USB
into memory channel 18.
• 3 beeps are emitted when memory programming is successful.
AGC
DUP
CMP
TBW
SCP
■ Memory clearing
Any unnecessary memory channels can be cleared.
The cleared memory channels become blank channels.
q Select memory mode with [V/M].
w Select the desired memory channel with [M-CH].
e Push [M-CL] for 1 sec. to clear the contents.
[M-CL]
• The programmed frequency and operating mode disappear.
• 3 beeps are emitted when memory clearing is successful.
r To clear other memory channels, repeat steps w
and e.
[V/M]
63
[M-CH]
MEMORY OPERATION
■ Selecting the call channel
By default 145.00000 MHz/FM is programmed into the
call channel. However, this can be changed to suit
your operating preference. (see below)
q Push [CALL] to select the call channel.
• “C” appears.
w Push [CALL] again to return to the previous mode.
[CALL]
AGC
DUP
CMP
TON
SCP
“C” appears
■ Programming the call channel
The call channel is programmed in the same way regular memory channels are. It’s convenient to program
a most-often-used frequency into the call channel for
quick recall. As with memory channels, the call channel can also hold split frequencies.
[MW]
q Rotate [M-CH] to select the call channel.
• “C” appears.
w Select the desired frequency and operating mode
to program into the call channel.
e Push [MW] for 1 sec. to program the displayed frequency and operating mode into the call channel.
[V/M]
[M-CH]
• 3 beeps are emitted when memory programming is successful.
IMPORTANT!: When the call channel is selected
with the [CALL] switch, the frequency CANNOT be
changed using the tuning dial, band keys or keypad
input. However, when the call channel is selected
using [M-CH] in memory mode, the frequency CAN
be changed.
AGC
DUP
CMP
TON
SCP
64
7
MEMORY OPERATION
■ Frequency transferring
The contents of a memory channel (frequency, operating mode, etc.) can be transferred to the VFO.
Frequency transferring can be performed in either VFO
mode or memory mode.
D Transferring in VFO mode
This is useful for transferring programmed contents to
VFO.
q Select VFO mode with [V/M].
w Select the memory channel to be transferred with
[M-CH].
[V/M]
[M-CH]
TRANSFERRING EXAMPLE IN VFO MODE
Operating frequency : 21.320 MHz/USB (VFO)
Contents of M-ch 16 : 14.018 MHz/CW
• “BLANK” appears if the selected memory channel is a
blank channel. In this case transferring is impossible.
e Push [V/M] for 1 sec. to transfer the frequency and
operating mode.
• 3 beeps are emitted.
Push [V/M] for 1 sec.
D Transferring in memory mode
This is useful for transferring frequency and operating
mode while operating in memory mode.
TRANSFERRING EXAMPLE IN MEMORY MODE
Operating frequency : 14.020 MHz/CW (M-ch 16)
Contents of M-ch 16 : 14.018 MHz/CW
When you have changed the frequency or operating mode in the selected memory channel:
• Displayed frequency and mode are transferred.
• Programmed frequency and mode in the memory
channel are not transferred, and they remain in the
memory channel.
q Select the memory channel to be transferred with
[M-CH] in memory mode.
Set the frquency
• And, set the frequency or operating mode if required.
w Push [V/M] for 1 sec. to transfer the frequency and
operating mode.
• 3 beeps are emitted when the transferring is successful.
• Displayed frequency and operating mode are transferred
to the VFO.
e To return to VFO mode, push [V/M] momentarily.
65
Push [V/M] for 1 sec.
then push [V/M]
MEMORY OPERATION
■ Programming scan edges
Memory channels P1 and P2 are the program scan
edges. They are used to program an upper and lower
frequency for programmed scan (p. 71). By default, P1
is programmed with 0.50000 MHz and P2 is programmed with 29.99999 MHz. If P1 and P2 are programmed with the same frequencies, programmed
scan will not proceed.
[V/M]
[MW]
[EXAMPLE]: Programming 14.00000 MHz into P1
and 14.35000 MHz into P2.
q Push [V/M] to select VFO mode, if necessary.
w Rotate [M-CH] to select scan edge P1.
e Rotate the tuning dial to set 14.00000 MHz as the
lower frequency.
r Push [MW] for 1 sec. to program 14.00000 MHz
into scan edge P1.
Tuning dial [M-CH]
• After steps w to r
• 3 beeps are emitted.
t Rotate [M-CH] to select scan edge P2.
y Rotate the tuning dial to set 14.35000 MHz as the
upper frequency.
u Push [MW] for 1 sec. to program 14.35000 MHz
into scan edge P2.
• After steps t to u
• 3 beeps are emitted.
• When programmed scan is activated (p. 71) scanning
will search the frequencies between 14.00000 MHz and
14.35000 MHz for signals.
66
7
MEMORY OPERATION
■ Assigning memory names
All memory channels (including scan edges) can be
tagged with alphanumeric names of up to 9 characters
each.
[V/M]
[EXAMPLE]: Programming “DX spot” into memory
channel 99.
q Push [V/M] to select memory mode, if necessary.
w Rotate [M-CH] to select memory channel 99.
e Push [MENU] several times to select M2.
r Push [F2 MEM] to select the memory name screen.
t Push [F1 EDT] to edit memory channel name.
[MENU]
Tuning dial [M-CH]
• A cursor appears and blinks.
• Memory channel names of blank channels cannot be
edited.
y Push [F1] several times to select the type of characters for input.
• “ABC” inputs capital letters A to Z.
• “abc” inputs small letters a to z.
• “etc” is used to input other characters— ! # $ % & ¥ ? ”
’ ` ^ + – ✱ / . , : ; = < > ( ) [ ] { } | _ – are available.
• Use the keypad to directly input numerals, “0” to “9,” including a decimal point.
u Rotate the tuning dial to select the first character for
input.
i Push [F2 ç] or [F3 å] to move the cursor forwards
or backwards, respectively.
SCN
MEM
SWR
TCN
VSC
F1
F2
F3
F4
F5
Push [F2 MEM]
• Push [F5 SPC] to input a space and [F4 DEL] to delete
the selected character.
o Repeat steps w to i to program another memory
channel’s name, if desired.
!0 Push [MENU] to set the memory channel name and
return to the memory name menu.
USB
) SEL
14.195OO
EDT
F2
F1
F3
F4
F5
DEL
SPC
F4
F5
Push [F2 MEM]
• Push [MENU] 1 more times to return to M2.
ABC
F1
F2
F3
• During assigning a memory names
DX
ABC
F1
F2
F3
DEL
SPC
F4
F5
Input space
Delete a character
Move cursor forwards
Move cursor backwards
Selects character type
• After assigning a memory names
DX
spot
abc
F1
67
F2
F3
DEL
SPC
F4
F5
MEMORY OPERATION
■ Memo pads
The transceiver has a memo pad function to store frequency and operating mode for easy write and recall.
The memo pads are separate from memory channels.
The default number of memo pads is 5, however, this
can be increased to 10 in set mode if desired. (p. 84)
D Writing frequencies and operating
modes into memo pads
➥ Push [MP-W] to store the displayed frequency and
operating mode into a memo pad.
• Each push of [MP-W] stores a frequency and mode into
the next available memo pad; when you write a 6the (or
11the) frequency and operating mode, the oldest written
frequency and operating mode are automatically erased
to make room for the new settings.
• Displayed frequency and mode
NOTE: Each memo pad must have its own unique
combination of frequency and operating mode;
memo pads having identical settings cannot be written.
• Stored in next available memo pad
MP-W
AGC
DUP
CMP
TBW
SCP
In this example, pushing [MP-W] enters 21.28000 MHz
USB into the top memo pad and erases the oldest
memo pad (21.34724 MHz LSB).
Erased
D Recalling a memo pad
➥ Push [MP-R] to recall a memo pad.
• Each push of [MP-R] recalls a memo pad, starting from
the most recently written.
• VFO or memory mode
• Memo pads
MP-R
AGC
DUP
CMP
TBW
SCP
MP-R
68
7
SCANS
■ Scan types
PROGRAMMED SCAN
∂F SCAN
Repeatedly scans between two scan edge frequencies
(scan edge memory channels P1 and P2).
Repeatedly scans within ∂F span area.
Scan edge
P1 or P2
Scan edge
P2 or P1
Start frequency
–∂F frequency
+∂F frequency
Scan
Scan
Scan
Jump
Jump
This scan operates in VFO mode.
This scan operates in both VFO and memory modes.
MEMORY SCAN
SELECT MEMORY SCAN
Repeatedly scans all programmed memory channels.
Repeatedly scans all select memory channels.
SEL
Mch 2
Mch 1
Mch 3
SEL
Mch 4
SEL
SEL
Mch 99
Mch 7
SEL
SEL
Mch 2
Mch 5
Mch 1
Mch 4
SEL
SEL
Mch 6
This scan operates in memory mode.
Mch 3
Mch 99
Mch 7
SEL
SEL
Mch 5
Mch 6
This scan operates in memory mode.
■ Preparation
• Channels
• Scan speed
For programmed scan:
Program scan edge frequencies into scan edge memory channels P1 and P2.
Scan speed can be selected from 2 levels, high or low,
in set mode. See p. 70 for details.
For ∂F scan:
Set the ∂F span (∂F scan range) in the scan screen.
For memory scan:
Program 2 or more memory channels except scan
edge memory channels.
For select memory scan:
Designate 2 or more memory channels as select memory channels. To designate the channel as a select
memory channel, choose a memory channel, then
push [F3 SEL] in the scan screen, or push [F5 SEL]
in the memory name screen.
• Scan resume ON/OFF
You can select the scan to resume or cancel when detecting a signal, in set mode. Scan resume ON/OFF
must be set before operating a scan. See p. 70 for
ON/OFF setting and scan resume condition details.
69
• Squelch condition
SCAN
STARTS
WITH
PROGRAMMED
SCAN
The scan continues
until it is stopped
SQUELCH manually, and does
OPEN
not pause even if it
detects signals.
MEMORY SCAN
Scan pauses on
each channel when
the scan resume is
ON; not applicable
when OFF.
Scan stops when detecting a signal.
If you set scan resume ON in scan set
SQUELCH mode, the scan pauses for 10 sec. when
CLOSED detecting a signal, then resumes. When a
signal disappears while scan is paused,
scan resumes 2 sec. later.
SCANS
■ Voice squelch control function
This function is useful when you don’t want unmodulated signals pausing or cancelling a scan. When the
voice squelch control function is activated, the receiver
checks received signals for voice components.
VSC indicator
If a receiver signal includes voice components, and the
tone of the voice components changes within 1 sec.,
scan pauses (or stops). If the received signal includes
no voice components or the tone of the voice components does not change within 1 sec., scan resumes.
➥ While M2 is selected with [MENU], push [F5 VSC]
to switch the VSC (Voice Squelch Control) function
ON and OFF.
• “VSC” appears when the function is activated.
• The VSC function activates for any scan.
• The VSC function resumes the scan on unmodulated signals, regardless of the scan resume condition is set to ON or OFF.
SCN
MEM
SWR
TCN
VSC
F1
F2
F3
F4
F5
Push [F5] to turn the VSC function ON and OFF.
■ Scan set mode
When the squelch is open, scan continues until it is
stopped manually— it does not pause on detected signals. When squelch is closed, scan stops when detecting a signal, then resumes according to the scan
resume condition. Scan speed and the scan resume
condition can be set using the scan set mode.
q Push[MENU] to select M2.
w Push [F1 SCN] to select scan menu.
e Push [F5 SET] to select scan set mode.
r Push [F1 ≤] or [F2 ≥] to select SCAN Speed
item.
t Rotate the tuning dial to select scan speed from
high and low.
• “HIGH” : scan is faster
• “LOW” : scan is slower
y Push [F2 ≥] to select SCAN Resume item.
u Rotate the tuning dial to select scan resume function from ON and OFF.
• “ON”
• “OFF”
SCN
MEM
SWR
TCN
VSC
F1
F2
F3
F4
F5
Push [F1]
PRO
F1
FIN
F2
F3
∂F : ± 1 O k
SPN
SET
F4
F5
Push [F5]
: when detecting a signal, scan pauses for
10 sec., then resumes. When a signal disappears, scan resumes 2 sec. later.
: when detecting a signal, cancels scanning.
i Push [MENU] to return to scan menu.
∂F
SCAN
F1
F2
Speed
HIGH
F3
F4
F5
Push [F1] or [F2]
SCAN
F1
F2
Resume
ON
F3
F4
F5
70
8
SCANS
■ Programmed scan/Fine programmed scan (VFO mode)
Programmed scan searches for signals between scan
edge memory channels P1 and P2. The default frequencies for these memories are 0.500000 MHz and
29.99999 MHz, respectively. See p. 66 for scan edges
programming.
[V/M]
[TS]
q Push [V/M] to select VFO mode, if necessary.
w Select the desired operating mode.
• The operating mode can also be changed while scanning.
e Push [TS] to select a tuning step.
[MENU]
• The tuning step can also be changed while scanning.
r Push [MENU] to select M2.
t Push [F1 SCN] to select the scan menu.
• See p. 69 for scan condition.
• If the [RF/SQL] control function is set as “AUTO,” the
squelch is always open in SSB, CW and RTTY modes.
y Push [F1 PRO] to start the programmed scan.
SCN
MEM
SWR
TCN
VSC
F1
F2
F3
F4
F5
• The MHz and kHz decimal points blink while scanning.
u When the scan detects a signal, the scan stops,
pauses or ignores it depending on the resume, VSC
setting and the squelch condition.
i To cancel the scan, push [F1 PRO].
• Rotating the tuning dial during scan also cancels scan
operation.
Tuning dial
Mode keys
Push [F1]
PRO
∂F
FIN
F2
F1
F3
∂F : ± 1 O k
SPN
SET
F4
F5
Push [F1]
If the same frequencies are programmed into the
scan edge memory channel P1 and P2, programmed scan does not start.
PROG
PRO
F1
∂F
SCAN
FIN SPN
F2
F3
F4
SET
F5
Push [F1] to start/cancel the scanning.
D About the Fine programmed scan
During programmed scan, when a signal is received,
scan continues, but the tuning step is temporarily set to
10 Hz.
q Follow steps q to y above to start programmed
scan.
w During programmed scan, push [F3 FIN] to switch
between programmed scan and fine programmed
scan operation.
e Push [F1 PRO] to cancel the scan.
• Rotating the tuning dial during scan also cancels scan
operation.
PRO
F1
F2
F3
F4
SET
F5
Push [F3] to switch
between programmed
scan and fine programmed scan.
PRO
F1
71
PROG SCAN
FIN SPN
∂F
F-PROG SCAN
FIN SPN
∂F
F2
F3
F4
SET
F5
SCANS
■ Memory scan operation (Memory mode)
Memory scan searches through memory channel 1 to
99 for signals. Blank (un-programmed) memory channels are skipped.
q Push [V/M] to select memory mode, if necessary.
w Push [MENU] to select M2.
e Push [F1 SCN] to select the scan menu.
• See p. 69 for scan condition.
• If the [RF/SQL] control function is set as “AUTO,” the
squelch is always open in SSB, CW and RTTY modes.
[MENU]
Tuning dial
[V/M]
r Push [F1 MEM] to start the memory scan.
• The MHz and kHz decimal points blink while scanning.
• At least 2 memory channels must be programmed for
memory scan to proceed.
t To cancel the scan, push [F1 MEM].
MEM
MEMO SCAN
SEL SPN
∂F
F2
F1
F3
SET
F4
F5
• Rotating the tuning dial during scan also cancels scan
operation.
Push [F1] to start/cancel the scanning.
■ Select memory scan
Select memory scan searches through memory channel set as “select” for signals. See below for setting
and deleting select memory channels.
q Follow the steps q to r above to start memory
scan.
w During memory scan, push [F3 SEL] to switch between memory scan and select memory scan.
• At least 2 memory channels must be set as the select
channel.
MEM
F2
F1
F3
SET
F4
F5
Push [F3] to switch
between memory scan
and select memory
scan.
e Push [F1 MEM] to cancel the scan.
• Rotating the tuning dial during scan also cancels scan
operation.
MEMO SCAN
SEL SPN
∂F
MEM
SEL-MEMO SCAN
SEL SPN SET
∂F
F2
F1
F3
F4
F5
D Setting/Cancelling select memory channels
All memory channels, except scan edges (P1 and P2),
can be set as a select memory channels.
➥ While the scan menu is selected, push [F3 SEL] to
set/cancel the displayed memory channel as a select channel; or while memory name screen is indicated, push [F5 SEL] to set/cancel the displayed
memory channel as a select memory channel.
• “SEL” appears when the channel set as a select memory
channel.
• “SEL” disappears when cancelled.
• Push [F3 SEL]/[F5 SEL] for 1 sec to cancels all select
memory settings.
• Scan menu
MEM
∂F
F2
F1
SEL
∂F : ± 1 O k
SPN
SET
F4
F5
F3
Push [F3] to set/cancel as a select channel.
Select memory inidcator
• Memory name screen
USB
) SEL
14.195OO
EDT
F1
F2
F3
F4
F5
Push [F3] to set/cancel as a select channel.
72
8
SCANS
■ ∂F scan operation and Fine ∂F scan
∂F scan searches for signals within the specified
range with the displayed VFO or memory channel frequency as for center frequency. The frequency range
is specified by the span.
Keypad [V/M]
q Push [V/M] to select VFO mode or memory mode,
as desired.
w Set center frequency of the ∂F scan.
e Push [MENU] to select M2.
r Push [F1 SCN] to select the scan menu.
• See p. 69 for scan condition.
• If the [RF/SQL] control function is set as “AUTO,” the
squelch is always open in SSB, CW and RTTY modes.
t Set the ∂F span by pushing [F4 SPN].
• ±5 kHz, ±10 kHz, ±20 kHz, ±50 kHz, ±100 kHz,
±500 kHz and ±1 MHz are selectable.
y Push [F2 ∂F] to start the ∂F scan.
[MENU]
SCN
MEM
SWR
TCN
VSC
F1
F2
F3
F4
F5
Push [F1]
• Decimal points blink while scanning.
u When the scan detects a signal, the scan stops,
pauses or ignores it depending on the VSC, resume
setting and the squelch condition.
y Push [F2 ∂F] to cancel the ∂F scan.
• Rotating the tuning dial during scan also cancels scan
operation.
Tuning dial
PRO
∂F
FIN
F2
F1
F3
Push [F2]
∂F : ± 1 O k
SPN
SET
F4
F5
Push [F4] to select the span.
∂F S C A N
P R O ∂F
FIN SPN SET
F1
F2
F3
F4
F5
Push [F2] to start/cancel the scanning.
D About the Fine ∂F scan
During ∂F scan, when a signal is received, scan continues, but the tuning step is temporarily set to 10 Hz.
q Follow steps q to y above to start programmed
scan.
w During ∂F scan, push [F3 FIN] to switch between
∂F scan and fine ∂F scan operation.
e Push [F2 ∂F] to cancel the scan.
• Rotating the tuning dial during scan also cancels scan
operation.
PRO
F1
F2
F3
F4
F5
Push [F3] to switch
between programmed
scan and fine programmed scan.
PRO
F1
73
∂F S C A N
FIN SPN SET
∂F
F - ∂F
∂F
F2
SCAN
FIN SPN
F3
F4
SET
F5
SCANS
■ Tone scan/DTCS code scan operation
By monitoring a signal that is being operated with a repeater, tone squelch or DTCS, you can determine the
tone frequency necessary to open a repeater or the
squelch.
q Push [AM/FM] to select FM mode.
w Push [MENU] several times to select M1.
e Push [F4 TONE] for 1 sec. to enter tone set mode.
r Push [F1 TON] to select the tone type to be
scanned.
• “Rptr Tone” for repeater tone, “TSQL Tone” for
tone squelch and “DTCS Code” for DTCS code can be
selected.
• When selecting DTCS code to be scanned, push [F5]
several times to select the DTCS code polarity.
“NN” : Normal polarity for both transmit and receive.
“NR” : Normal polarity for transmit and reverse polarity
for receive.
“RN” : Reverse polarity for transmit and normal polarity
for receive.
“RR” : Reverse polarity for both transmit and receive.
AGC
DUP
CMP
TON
SCP
F1
F2
F3
F4
F5
Push [F4] for 1 sec.
TON
F1
Rptr
SCN
F2
Tone
88.5Hz
F3
F4
F5
Push [F1] several times to select tone type.
• Rpeater tone scan
TON
F1
Rptr
SCN
F2
Tone
SCAN
88.5Hz
F3
F4
F5
t Push [F2 SCN] to start the tone scan function.
• “Rptr Tone SCAN,” “TSQL Tone SCAN” or
“DTCS Code SCAN” blinks when repeater tone scan,
tone squelch scan or DTCS code scan is operated, respectively.
y When matched tone or code is found, the scan
pauses and the tone frequency or code is set for the
selected tone as in step r.
When the tone scan or DTCS code scan is operated
in memory or call channel, the detected tone frequency
or code can be used for temporarily.
To keep the detected tone frequency or code setting
for memory contents, you must over-written the memory or call channel.
u Push [F2 SCN] to cancel the tone scan function.
• Rotating the tuning dial during scan also cancels scan
operation.
Push [F2] to start/cancel the scan.
• Tone squelch tone scan
TON
F1
TSQL
SCN
F2
Tone
SCAN
88.5Hz
F3
F4
F5
Push [F2] to start/cancel the scan.
• DTCS code scan
TON
F1
DTCS
SCN
F2
Code
SCAN
O23-NN
F3
F4
F5
Push [F2] to start/cancel the scan.
Push [F1] several times to select porality.
74
9
ANTENNA TUNER OPERATION
■ Antenna connection and selection
The IC-746PRO has 2 antenna connectors for the
HF/50 MHz bands, [ANT1] and [ANT2], and 1 antenna
connector for the 144 MHz band; a total of 3 antenna
connectors.
For each operating band the IC-746PRO covers, there
is a band memory which can memorize a selected antenna. When you change the operating frequency beyond a band, the previously used antenna is automatically selected (see below) for the new band. This
function is convenient when you use 2 antennas for HF
and 50 MHz bands operation.
• Antenna select function: “Auto”
Once an antenna has been selected for use with a
band by pushing [ANT], the antenna is automatically
selected whenever that band is accessed.
[EXAMPLE]: a 3.5/7 MHz antenna is connected to
[ANT1], a 21/28/50 MHz antenna is connected to
[ANT2]. When the antenna selector function is set to
“Auto,” an antenna is automatically selected when
changing bands.
• Antenna select function: “Manual”
When “Manual” is selected, you can use the [ANT1]
and [ANT2], however, band memory does not function. In this case you must select an antenna manually. However, the 144 MHz antenna will still be
selected automatically.
[EXAMPLE]: an optional antenna tuner and HF antenna are connected to [ANT1] and a 50 MHz antenna is connected to [ANT2].
• Antenna select function: “OFF”
In this case, only [ANT1] and the 144 MHz antenna
connector can be used. [ANT] switch does not function.
75
[ANT]
144 MHz
21/28/50 MHz
[ANT2]
144 MHz band 50 MHz band
3.5/7 MHz
[ANT1]
HF bands
AH-4
[ANT2]
[ANT1]
ANTENNA TUNER OPERATION
■ Antenna tuner operation
The internal automatic antenna tuner matches the
transceiver to the connected antenna automatically.
Once the tuner matches an antenna, the variable capacitor angles are memorized as a preset point for each
frequency range (100 kHz steps). Therefore, when you
change the frequency range, the variable capacitors are
automatically preset to the memorized point.
CAUTION: NEVER transmit with the tuner ON
[TUNER]
when no antenna is connected. This will damage
the transceiver. Be careful of the antenna selection.
D TUNER OPERATION
➥ Push [TUNER] to turn the internal antenna tuner
ON. The antenna is tuned automatically when the
antenna SWR is higher than 1.5:1.
• When the tuner is ON, the “TUNE” indicator appears.
• MANUAL TUNING
During SSB operation at low voice levels, the internal
tuner may not be tuned correctly. In such cases, manual tuning is helpful.
➥ Push [TUNER] for 1 sec., to start manual tuning.
• A side tone is emitted and [TUNER] blinks while tuning.
• If the tuner cannot reduce the SWR to less than 1.5:1
after 20 sec. of tuning, the [TUNER] switch indicator
goes out.
• AUTOMATIC TUNER START (HF bands only)
If you want to deactivate the tuner under conditions
of VSWR 1.5:1 or less, use the auto tuner start function and turn the tuner OFF. This function activates
the tuner automatically when the SWR exceeds 1.5:1.
This function is turned ON in set mode. (p. 83).
• PTT TUNER START
The tuner is always tuned when the PTT is pushed
after the frequency is changed (more than 1% from
last-tuned frequency). This function removes the
“push and hold [TUNER]” operation and activates for
the first transmission on a new frequency.
This function is turned ON in set mode. (p. 83).
• Antenna tuner of the IC-PW1
When using an external antenna tuner such as the
IC-PW1’s tuner, tune with the external antenna tuner,
while the internal tuner is turned OFF. After tuning is
completed, turn the internal tuner ON. Otherwise,
both tuners tune simultaneously and correct tuning
may not be obtained.
See the instruction manual included with each antenna tuner for their respective operations.
NOTES:
• The internal antenna tuner can only tune the HF and
50 MHz bands— the 144 MHz band cannot be tuned.
• DO NOT transmit if no antenna is connected to [ANT1]
and [ANT2].
• When 2 antennas are connected, select the antenna to
be used with [ANT].
• If the SWR is higher than about 1.5:1 when tuning above
100 kHz on an antenna’s preset point, push [TUNER] for
1 sec. to start manual tuning.
• The internal tuner may not be able to tune in AM mode. In
such cases, push [TUNER] for 1 sec. to manually tune.
D If the tuner cannot tune the antenna
Check the following and try again:
• the [ANT] connector selection.
• the antenna connection and feedline.
• the unaltered antenna SWR. (Less than 3:1 for HF bands;
Less than 2.5:1 for 50 MHz band)
• the transmit power. (8 W for HF bands; 15 W for 50 MHz
band)
• the power source voltage/capacity.
If the tuner cannot reduce the SWR to less than 1.5:1
after checking the above, perform the following:
• repeat manual tuning several times.
• tune with a 50 Ω dummy load and re-tune the antenna.
• turn power OFF and ON.
• adjust the antenna cable length.
(This is effective for higher frequencies in some cases.)
• Some antennas, especially for low bands, have a narrow bandwidth. These antennas may not be tuned at the
edge of their bandwidth, therefore, tune such an antenna as follows:
[Example]: Suppose you have an antenna which has an
SWR of 1.5:1 at 3.55 MHz and an SWR of 3:1 at 3.8 MHz.
Push [TUNER] to turn the antenna tuner ON.
Select CW mode.
Turn OFF the break-in function. (p. 56)
Push [TRANSMIT] to set to the transmit condition.
Set 3.55 MHz and key down.
Set 3.80 MHz and key down.
Push [TRANSMIT] to return to the receive condition.
76
9
ANTENNA TUNER OPERATION
■ Optional external tuner operation
D AH-4 HF/50 MHz AUTOMATIC ANTENNA TUNER
AH-4 setting example:
The AH-4 matches the IC-746PRO to a long wire antenna more than 7 m/23 ft long (3.5 MHz and above).
For mobile operation
• See the AH-4 instruction manual for AH-4 installation and
antenna connection details.
Optional AH-2b
antenna element
NEVER operate the AH-4 without an antenna wire.
The tuner and transceiver will be damaged.
NEVER operate the AH-4 when it is not grounded.
Transmitting before tuning may damage the transceiver. Note that the AH-4 cannot tune when using a
1⁄2 λ long wire or multiple of the operating frequency.
For outdoor operation
Long wire
When connecting the AH-4, the antenna connector
assignments are [ANT2] for the internal tuner and
[ANT1] for the AH-4. The antenna indicator in the
LCD displays “EXT” when the AH-4 is connected
and selected.
R WARNING: HIGH VOLTAGE!
NEVER touch the antenna element while tuning or
transmitting.
D AH-4 operation
Tuning is required for each frequency. Be sure to
re-tune the antenna before transmitting when you
change the frequency— even slightly.
q Set the desired frequency in an HF or 50 MHz
band.
• The AH-4 may not operate on frequencies outside of
ham bands.
w Push [TUNER] for 1 sec.
• “TUNER” blinks while tuning.
e “TUNE” appears constantly when tuning is complete.
• When the connected wire cannot be tuned, the “TUNE”
indicator goes out, and the AH-4 is bypassed. At that
point the antenna wire connection root is to the transceiver directly, and not via AH-4 antenna tuner.
[TUNER]
r To bypass the AH-4 manually, push [TUNER].
• Connecting the AH-4
Long wire or optional AH-2b
Coaxial cable (from AH-4)
Transceiver
ANT1
Control cable
77
Ground
AH-4
10
DATA COMMUNICATION
■ Connections
■ When connecting to [DATA]
• When using a PC application
q DATA IN
w GND
TX AUDIO
GND
r DATA OUT (9600 bps)
RX AUDIO
y P SQL*
t AF OUT (1200 bps)
e PTT P
SQL
Connect to serial port, parallel
port, speaker jack, microphone
jack and line IN/OUT jack, etc.
See the instruction manual of the
application for details.
PC
PTT
• When using a TNC
TNC
q DATA IN
w GND
TX AUDIO
GND
r DATA OUT (9600 bps)
RX AUDIO
y P SQL*
t AF OUT (1200 bps)
e PTT P
SQL
PTT
RS-232C
*When connecting the squelch line, cpnsult the necessary manual (TNC, etc.)
■ When connecting to [ACC(1)]
• When using a PC application
RTTY
RTTY OUTPUT
GND
GND
AF
AUDIO INPUT
SEND
PTT
PC
TNC or scan converter
• When using a TNC
Connect to serial port, parallel
port, speaker jack, microphone
jack and line IN/OUT jack, etc.
See the instruction manual of the
application for details.
RTTY
GND
RTTY OUTPUT
AF
SEND
AUDIO INPUT
RS-232C
GND
PTT
Rear panel view
■ When connecting to [MIC]
• When using a PC application
MIC INPUT
AUDIO OUTPUT
AF OUTPUT
AF INPUT
MIC GND
GND
GND
PTT*
PTT*
Connect to serial port, parallel
port, speaker jack, microphone
jack and line IN/OUT jack, etc.
See the instruction manual of the
application for details.
PC
• When using a TNC
MIC INPUT
AFSK OUTPUT
AF OUTPUT
AF INPUT
MIC GND
GND
GND
PTT*
SQL†
PTT*
SQL INPUT†
TNC or scan converter
RS-232C
*When using the VOX function, not need to connect. Refer to the external
equipment (TNC, etc.).
†
When connecting the squelch line, consult the necessary manual (TNC, etc.).
78
10
DATA COMMUNICATION
■ Packet (AFSK) operation
Before operating packet (AFSK) be sure to consult the
operating manual that came with your TNC.
[TRANSMIT]
[TX] indicator
Band keys
[MIC GAIN] [SSB]
[AM/FM] Tuning dial
q Connect a TNC and PC. (p. 77)
w Push a band key to select an operating band.
e Push [SSB] or [AM/FM] to select the desired operating mode.
• After LSB or USB is selected, push [SSB] for 1 sec. to
select LSB data or USB data mode, or after AM or FM is
selected, push [AM/FM] for 1 sec. to select AM data or
FM data mode.
• Generally, LSB is used on HF bands and FM is used for
packet operation on the VHF band.
Selected mode indicator appear
r Rotate the tuning dial to tune the desired signal.
t Transmit your AFSK signals using your computer’s
keyboard.
• Rotate [RF PWR] to set the output power.
• Relative strength of the transmitted signal is indicated in
the Po meter while operating the TNC.
• When operating in SSB (data) mode, adjust output
power so that the ALC reading in the ALC meter stays
in the ALC zone.
NOTE: When connecting a TNC to the ACC socket
on the rear panel, select SSB (LSB/USB) data mode
or disconnect the microphone and rotate [MIC
GAIN] fully counterclockwise.
When SSB data mode is selected, the audio input
from the [MIC] connector is automatically cut, and
use the audio input from the [ACC(1)].
And, when the SSB data mode is selected, signals
are transmitted with the fixed conditions as follow;
• Speech compressor : OFF
• Transmit bandwidth : MID
• Tx tone (Bass)
:0
• Tx tone (Trebles)
:0
D Frequency indication during AFSK operation
When operating AFSK in SSB mode, the indicated frequency is the signals carrier point.
• Example— LSB/LSB data mode
Mark freq.: 2125 Hz
Shift freq.: 200 Hz
2325 Hz
200 Hz
2125 Hz
Carrier point
(Displayed frequency)
79
DATA COMMUNICATION
10
■ Adjusting the TNC output level
When setting data transmission speed to 9600 bps,
the data signal coming from the TNC is applied exclusively to the internal limiter circuitry to automatically
maintain band width.
NEVER apply data levels from the TNC of over 0.6 V
p-p, otherwise the transceiver will not be able to maintain the band width and may possibly interfere with
other station.
D Using with a level meter or synchroscope
When using a level meter or synchroscope, adjust the
TX audio output level (DATA IN level) from the TNC as
follows.
0.4 V p-p (0.2 Vrms)
: recommended level
0.2–0.5 V p-p (0.1–0.25 Vrms) : acceptable level
D Not using a measuring device
q Connect transceiver to a TNC. (p. 00)
w Enter a test mode (“CAL,” etc.) on the TNC, then
transmit some test data.
e When the transceiver fails to transmit the test data
or transmits sporadically (TX indicator doesn’t lights
or flashes):
- Decrease the TNC output level until the transmit
indicator lights continuously.
When transmission is not successful even though
the TX indicator lights continuously:
- Increase the TNC output level.
■ Data transmission speed
For data communication, the transceiver can be set to
one of two data speeds: 9600 bps or less speed.
q Push [MENU] for 1 sec. to enter set mode.
w Push [F1 ≤] or [F2 ≥] to select the 9600bps
Mode item.
e Rotate the tuning dial to turn ON and OFF the
9600 bps mode.
ON : 9600 bps of data speed
OFF : less than 9600 bps of data speed (default)
r Push [MENU] to return to previous indication.
96OObps
21
Mode
OFF
Select with the tuning dial
96OObps
21
Mode
ON
80
11
SET MODE
■ General set mode
D Entering set mode
Set mode is used for programming infrequently
changed values or conditions of functions.
• Set mode operation
[F1 ≤] [F2 ≥]
q Push [MENU] several times to function menu indication, if necessary.
w Push [MENU] for 1 sec. to enter the set mode.
e Push [F1 ≤] or [F2 ≥] to select the desired item.
r Set the desired condition using the tuning dial.
• Push [F3] for 1 sec. to select a default condition or value.
u Push [MENU] to exit the set mode.
[MENU]
Tuning dial
D Set mode items
1. LCD Contrast
This item adjusts the contrast of the LCD from 0% to
100% in 1% steps.
(default: 50%)
LCD
Contrast
LCD
Backlight
5O%
5O%
2. LCD Backlight
This item adjusts the brightness of the LCD from 0%
to 100% in 1% steps.
(default: 50%)
3. Beep Level
This item adjusts the volume level for confirmation
beep tones from 0% to 100% in 1% steps. When
beep tones, the item 6. Beep (p. 81), are turned
OFF, this setting has no effect.
(default: 50%)
Beep
Level
Beep
Level-lmt
ON
Cal.
Marker
5O%
4. Beep Level-lmt
This item allows you to set a maximum volume level
for confirmation beep tones. Confirmation beep tones
are linked to the [AF] control until a specified volume
level is reached— further rotation of the [AF] control
will not increase the volume of the beep tones.
ON
OFF
Confirmation beep ON (default)
Confirmation beep OFF
5. CAL. Marker
This item is used for a simple frequency check of the
transceiver.
ON
OFF
Calibration marker ON
Calibration marker OFF (default)
See p. 93 for calibration procedure.
81
OFF
Turn the calibration marker OFF after checking the
frequency of the transceiver.
SET MODE
11
■ General set mode (continued)
6. Beep
A beep sounds each time a switch is pushed to confirm it. This function can be turned OFF for silent operation.
ON
OFF
Beep
ON
Confirmation beep ON (default)
Confirmation beep OFF
The volume level can be set in 3. Beep Level.
(p. 80)
7. Band Edge Beep
A beep sounds when an operating frequency enters
or exits an amateur band. This functions independent
of the confirmation beep setting (above).
ON
OFF
Band
Edge
Beep
ON
Band edge beep ON (default)
Band edge beep OFF
The volume level can be set in 3. Beep Level.
(p. 80)
8. RF/SQL Control
The [RF/SQL] control can be set as the RF/squelch
control (default), the squelch control only (RF gain is
fixed at maximum) or ‘Auto’ (RF gain control in SSB,
CW and RTTY; squelch control in AM and FM).
RF+SQL
SQL
AUTO
RF/SQL
Control
RF+SQL
[RF/SQL] control as RF/squelch control (default)
[RF/SQL] control as squelch control
[RF/SQL] control as RF gain control
in SSB, CW and RTTY; squelch control in AM and FM
9. Meter Peak Hold
This item turns the meter peak hold function ON and
OFF. When set to ON (default), peak meter reading
are displayed for about 0.5 sec.
Meter
Peak
Hold
ON
10. COMP Meter
This item turns the COMP meter indication ON and
OFF during transmit. When set to ON, the COMP
meter is displayed instead of the SWR meter.
(default: OFF)
COMP
1O
Meter
OFF
82
11
SET MODE
■ General set mode (continued)
11. Quick SPLIT
When this item is set to ON, pushing [SPLIT] for 1
sec. sets transmit frequency using the displayed frequency and the split offset, set in SPLIT Offset
item below, and activate split function automatically.
ON
OFF
Quick
11
SPLIT
SPLIT
12
Offset
O.OOOMHz
SPLIT
13
LOCK
ON
Quick split ON (default)
Quick split OFF
12. SPLIT Offset
This item sets the offset (difference between transmit
and receive frequencies) for the quick split function.
The offset frequency can be set from –9.999 MHz to
+9.999 MHz in 1 kHz steps.
13. SPLIT LOCK
When this item is ON, the tuning dial can be used to
adjust the transmit frequency while pushing [XFC]
even while the dial lock function is activated.
ON
OFF
OFF
Split lock function ON
Split lock function OFF (default)
14. DUP Offset
HF
This item sets the offset (difference between transmit
and receive frequencies) for the duplex operation.
However, this setting is used to input the repeater offset for an HF band only.
DUP
14
Offset
HF
O.1OOMHz
DUP
15
Offset
5OM
O.5OOMHz
DUP
16
Offset 144M
O.6OOMHz
The offset frequency can be set from 0.000 MHz to
9.999 MHz in 1 kHz steps.
15. DUP Offset
50M
This item sets the offset (difference between transmit
and receive frequencies) for the duplex operation.
However, this setting is used to input the repeater offset for a 50 MHz band only.
The offset frequency can be set from 0.000 MHz to
9.999 MHz in 1 kHz steps.
16. DUP Offset 144M
This item sets the offset (difference between transmit
and receive frequencies) for the duplex operation.
However, this setting is used to input the repeater offset for a 144 MHz band only.
The offset frequency can be set from 0.000 MHz to
9.999 MHz in 1 kHz steps.
83
SET MODE
11
17. One Touch Rptr
This item turns the one touch repeater function to ON
(DUP- or DUP+) and OFF.
One
17
Touch
Rptr
DUP-
When [F2 DUP] is pushed for 1 sec. during M1, the
selected offset direction and the programmed duplex
offset frequency (depending on the operating frequency band) is set with the displayed frequency.
84
11
SET MODE
■ General set mode (continued)
22. [ANT] Switch
You can set the antenna connector selection to automatic, manual or non-selection (when using 1 antenna only for the HF/50 MHz bands).
[ANT]
22
Switch
Auto
: The antenna switch is activated and
the band memory memorizes the selected antenna. (default)
Manual: The antenna switch is activated and
selects an antenna manually.
OFF
: The antenna switch is not activated
and does not function. The [ANT1] connector is always selected in this case.
Auto
23. SPEECH Language
When the optional UT-102 VOICE SYNTHESIZER UNIT is
installed, you can select between English and Japanese as the language.
English
Japanese
SPEECH
23
Language
English
SPEECH
24
Speed
HIGH
SPEECH
25
S-Level
ON
Memory
26
Pad
: Announces in English (default)
: Announces in Japanese
See p. 89 for unit installation.
24. SPEECH Speed
When the optional UT-102 VOICE SYNTHESIZER UNIT is
installed, you can select between faster or slower
synthesizer output.
HIGH
LOW
: Announces faster (default)
: Announces slower
See p. 89 for unit installation.
25. SPEECH S-Level
When the optional UT-102 VOICE SYNTHESIZER UNIT is
installed, you can have frequency, mode and signal
level announcement. Signal level announcement can
be deactivated if desired.
ON
OFF
: Announces operating frequency, mode
and receiving signal level. (default)
: Announces operating frequency and
mode only.
See p. 89 for unit installation.
26. Memory Pad Ch
This item sets the number of memo pad channels
available. 5 or 10 memo pads can be set.
5 : 5 memo pads (default)
10 : 10 memo pads
85
Ch
SET MODE
11
■ General set mode (continued)
27. DIAL Auto TS
This item sets the auto tuning step function. When rotating the tuning dial rapidly, the tuning step automatically changes several times as selected.
DIAL
27
Auto
TS
HIGH
There are 2 type of auto tuning steps: HIGH (Fastest)
and LOW (Faster).
HIGH
LOW
OFF
: Auto tuning step is turned ON.
Approx. 5 times fastest tuning step
during rapid rotation (default)
: Auto tuning step is turned ON.
Approx. 2 times faster tuning step during rapid rotation
: Auto tuning step is turned OFF.
28. MIC U/D Speed
This item sets the rate at which frequencies are
scanned when the microphone [UP]/[DN] switches
are pushed and held. High or low can be selected.
HIGH
LOW
MIC
28
U/D
Speed
HIGH
: High speed (default, 50 tuning
steps/sec.)
: Low speed (25 tuning steps/sec.)
29. Quick RIT Clear
This item selects the RIT/∂TX frequency clearing instruction with [PBTC].
ON
OFF
Quick
29
RIT
Clear
OFF
: Clears the RIT/∂TX frequency when
[PBTC] is pushed momentarily.
: Clears the RIT/∂TX frequency when
[PBTC] is pushed for 1 sec. (default)
30. BW Popup (PBT)
This item turns the PBT shifting value indication ON
and OFF during [TWIN PBT] control operation. When
set to ON, the shifting value is displayed above the
multi-function switches.
(default: ON)
BW
3O
Popup
(PBT)
ON
BW
31
Popup
(FIL)
ON
31. BW Popup (FIL)
This item turns the IF filter width indication ON and
OFF when selecting with [FILTER]. When set to ON,
the filter width is displayed above the multi function
switches.
(default: ON)
86
11
SET MODE
■ General set mode (continued)
32. SSB/CW Synchronous Tuning
This item selects the displayed frequency shift function from ON and OFF.
SSB/CW
32
Sync
Tun
OFF
When this function is activated, the receiving signal
can be kept to receive even when the operating mode
is changed between SSB and CW.
ON
OFF
: The displayed frequency shifts when
the operating mode is changed between SSB and CW.
: The displayed frequency does not shift.
(default)
The frequency shifting value may differ according
to the CW pitch setting.
33. CW Normal Side
Selects the carrier point of CW mode from LSB and
USB.
LSB
USB
CW
33
Normal
Side
LSB
: The carrier point is set to LSB side.
(default)
: The carrier point is set to USB side.
34. KEYER 1st Menu
This item selects the appearing menu when [F4 KEY]
is pushed in M1 at first, from KEYER-Root and
KEYER-SEND.
KEYER-Root
KEYER-SEND
KEYER 1st Menu
34
KEYER-Root
: Selects memory keyer
menu at first (default)
: Selects keyer SEND menu
at first
35. External Keypad
This item sets the external keypad capability.
: External keypad does not function. (default)
KEYER SEND : Pushing one of external keypad
switches, transmits the desired
keyer memory contents during
CW mode operation.
External
35
OFF
For your information
The diagram as at right shows the equivalent circuit of
an external keypad and connects to the pin 3 and
pin 7 of the [MIC] connector (p. 12)
87
4.7kΩ
±5%
S4
(T4/M4)
2.2kΩ
±5%
S3
(T3/M3)
1.5kΩ
±5%
1.5kΩ
±5%
S2
(T2/M2)
S1
(T1/M1)
USER EXTERNAL KEYPAD
Keypad
OFF
To [MIC] connector pin e
To [MIC] connector pin u
SET MODE
11
■ General set mode (continued)
36. CI-V Baud Rate
This item sets the data transfer rate. 300, 1200, 4800,
9600, 19200 bps and “Auto” are available.
Auto
3OO
12OO
48OO
96OO
192OO
CI-V
36
Baud
Rate
Auto
CI-V
37
Address
66h
CI-V
38
Transceive
ON
CI-V
39
731
: Auto baud rate (default)
: 300 bps
: 1200 bps
: 4800 bps
: 9600 bps
: 19200 bps
When “Auto” is selected, the baud rate is automatically set according to the connected controller or remote controller.
37. CI-V Address
To distinguish equipment, each CI-V transceiver has
its own Icom standard address in hexadecimal code.
The IC-746PRO’s address is 66h.
When 2 or more IC-746PRO’s are connected to an
optional CT-17 CI-V LEVEL CONVERTER, rotate the tuning dial to select a different address for each IC746PRO in the range 01h to 7Fh.
38. CI-V Transceive
Transceive operation is possible with the IC-746PRO
connected to other Icom HF transceivers or receivers.
ON
OFF
: Transceive ON (default)
: Transceive OFF
When “ON” is selected, changing the frequency, operating mode, etc. on the IC-746PRO automatically
changes those of connected transceivers (or receivers) and vice versa.
39. CI-V 731 Mode
When connecting the IC-746PRO to the IC-735 for
transceive operation, you must change the operating
frequency data length to 4 bytes.
Mode
OFF
• This item must be set to “ON” only when operating the
transceiver with the IC-735.
ON
OFF
: 4 bytes of frequency data
: 5 bytes of frequency data (default)
88
11
SET MODE
■ Tone control set mode
D Entering tone control set mode
Tone levels (bass and treble) for each transmit and receive audio can be set for each phone mode independently.
[F1 ≤] [F2 ≥] [F4 TCN]
• Set mode operation
q Push [MENU] several times to select M2.
w Push [F4 TCN] to select the tone control set mode.
e Push [F1 ≤] or [F2 ≥] to select the desired item.
r Push [SSB] or [AM/FM] to select the desired operating mode.
t Set the desired condition using the tuning dial.
• Push [F3] for 1 sec. to select a default value.
y Push [MENU] to exit the set mode.
[MENU]
Tuning dial
D Tone control set mode items
1. TX Bass
This item adjusts the bass level of the transmit audio
tone from –5 dB to +5 dB in 1 dB steps.
TX
Bass
SSB
TX
Treble
SSB
RX
Bass
SSB
RX
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.
3. RX Bass
This item adjusts the bass level of the receive audio
tone from –5 dB to +5 dB in 1 dB steps.
4. RX Treble
This item adjusts the treble level of the receive audio
tone from –5 dB to +5 dB in 1 dB steps.
89
OPTION INSTALLATION
12
■ Opening the transceiver’s case
Follow the case and cover opening procedures shown
here when you want to install an optional unit or adjust
the internal units, etc.
CAUTION: DISCONNECT the DC power cable
from the transceiver before performing any work on
the transceiver. Otherwise, there is danger of electric shock and/or equipment damage.
q Remove 2 screws from the left side of the transceiver to remove the carrying handle as shown at
right.
w Remove 6 screws from the top of the transceiver
and 6 screws from the sides, then lift up the top
cover.
e Turn the transceiver upside down.
r Remove 6 screws from the bottom of the transceiver, then lift up the bottom cover.
■ UT-102 VOICE SYNTHESIZER UNIT
The UT-102 announces the accessed readout’s frequency, mode, etc. (S-meter level can also be announced— p. 84) in a clear, electronically-generated
voice, in English (or Japanese).
➥ Push [LOCK/SPCH] for 1 sec. to announce the frequency, etc.
q Remove the top and bottom covers as shown
above.
w Remove the protective paper attached to the bottom of the UT-102 to expose the adhesive strip.
e Plug UT-102 into J1920 on the MAIN unit as shown
in the diagram at right.
r Adjust the trimmer, SPCH LVL: R1925 on the MAIN
unit, to set the speech level if desired. Refer the illustration at right.
t Return the top and bottom covers to their original
positions.
MAIN unit
UT-102
R1925
J1920
90
12
OPTION INSTALLATION
■ CR-338 HIGH STABILITY CRYSTAL UNIT
By installing the CR-338, the total frequency stability
of the transceiver will be improved.
q Remove the bottom covers as shown in the previous page.
w Remove 4 screws from the shield cover of the RF
unit, then lift up the shield cover.
Shield cover
Earth spring
• There is an earth spring with the shield cover, so be
careful for lost it when removing the cover.
RF unit
TUNER
(antenna tuner)
connector
e Remove 8 screws from the RF unit, disconnect J1,
J121 and J151, then remove the RF unit.
r Remove the supplied internal crystal and replace
with the CR-338.
t Return the RF unit, J1, J121 and J151 to their original positions.
Black belt
CR-338
Supplied crystal
Blue
belt
J151
Blue
J1
Black
J121
Red
Red belt
RF unit
Soldering
points
y Connect a frequency counter to the J262, 2LO IN,
then adjust the reference frequency to be
64.00000 MHz with the L1901 on the RF unit.
u Return the J262, shield cover, earth spring and bottom covers to their original positions.
Connect a frequency counter, then adjust
the ferquency to be 64.00000 MHz.
RF unit
J262
2LO IN
L1901
91
MAINTENANCE
13
■ Troubleshooting
The following chart is designed to help you correct
problems which are not equipment malfunctions.
POWER
PROBLEM
If you are unable to locate the cause of a problem or
solve it through the use of this chart, contact your nearest Icom Dealer or Service Center.
POSSIBLE CAUSE
p. 16
• Re-connect the DC power cable correctly.
• Check for the cause, then replace the fuse with p. 92
the spare one.
(Fuses are installed in the DC power cable and
the internal PA unit.)
No sounds come out from • Volume level is too low.
the speaker.
• The squelch is closed.
• Rotate [AF] clockwise to obtain a suitable lis- p. 23
tening level.
• Turn [RF/SQL] to 10 o’clock position to open the p. 24
squelch.
• Push [TRANSMIT] to receive or check the p. 25
SEND line of an external unit, if desired.
Sensitivity is too low, and • The antenna is not connected properly.
only strong signals are au- • The antenna for another band is selected.
dible.
• The antenna is not properly tuned.
• The attenuator is activated.
—
• Re-connect to the antenna connector.
• Select an antenna suitable for the operating fre- p. 75
quency.
• Push [TUNER] for 1 sec. to manually tune the pgs. 76,
77
antenna.
• Push [P.AMP/ATT] for 1 sec. to select “ATT OFF.” p. 48
• Select a suitable operating mode.
Received audio is unclear • Wrong operating mode is selected.
• Push [PBTC] for 1 sec. to reset the function
or distorted.
• PBT function is activated.
• Noise blanker is turned ON when receiving a • Push [NB] to turn the noise blanker OFF.
strong signal.
• Push [P.AMP/ATT] once or twice to turn the
• Preamp is activated.
function OFF.
• The noise reduction is activated and the [NR] • Set the [NR] control for maximum readability.
control is too far clockwise.
The [ANT] switch does not • The antenna switch has not been activated.
function
Output power is too low.
• [RF PWR] is set too far counterclockwise
• [MIC GAIN] is set too far counterclockwise
• The antenna for another band is selected.
• The antenna is not properly tuned.
p. 23
p. 52
p. 51
p. 48
p. 53
• Set the antenna switch in set mode to “Auto” or p. 84
“Manual.”
Transmitting is impossible. • The operating frequency is not set to a ham • Set the frequency to a ham band.
band.
TRANSMIT
REF.
Power does not come on • Power cable is improperly connected.
when the [POWER] switch • Fuse is blown.
is pushed.
• The transceiver is in transmitting condition.
RECEIVE
SOLUTION
• Rotate [RF PWR] clockwise.
• Set [MIC GAIN] to a suitable position.
• Select an antenna suitable for the operating frequency.
• Push [TUNER] for 1 sec. to manually tune the
antenna.
p. 19
p. 25
p. 25
p. 75
pgs. 76,
77
• Push [RIT] or [∂TX] to turn the function OFF.
pgs. 48,
No contact possible with • RIT or ∂TX function is activated.
56
another station.
• Split frequency and/or duplex function are acti- • Push [SPLIT] and/or [F2 DUP] (in M1) to turn pgs. 58,
the function OFF.
44
vated.
Transmit signal is unclear • [MIC GAIN] is set too far clockwise
or distorted.
• Set [MIC GAIN] to a suitable position.
p. 25
Repeater cannot be ac- • Split frequency or duplex function is not acti- • Push [SPLIT] and/or [F2 DUP] (in M1) to turn pgs. 44,
the function ON
58
cessed.
vated.
p. 45
• Programmed subaudible tone frequency is • Reset the frequency using set mode.
wrong.
SCAN
• Set [RF/SQL] to the threshold point.
p. 24
Programmed scan does • Squelch is open.
not stop.
• [RF/SQL] is assigned to RF gain control and • Reset [RF/SQL] control assignment and set it to pgs. 24,
the threshold point.
81
squelch is open.
Programmed scan does • The same frequencies have been programmed • Program different frequencies in scan edge p. 66
memory channel P1 and P2.
not start.
in scan edge memory channels P1 and P2.
Memory scan does not • 2 or more memory channels have not been • Program more than 2 memory channels.
start
programmed.
p. 63
Select memory scan does • 2 or more memory channels have not been • Designate more than 2 memory channels as se- p. 72
lect channels for the scan.
not start
designated as select channels.
92
13
MAINTENANCE
DISPLAY
PROBLEM
POSSIBLE CAUSE
The displayed frequency • The dial lock function is activated.
does not change properly. • A set mode screen is selected.
• The internal CPU has malfunctioned.
SOLUTION
REF.
• Push [LOCK/SPCH] to turn the function OFF.
p. 53
• Push [MENU] several times to exit the set —
mode.
• Reset the CPU.
p. 93
■ Fuse replacement
If a fuse blows or the transceiver stops functioning, try
to find the source of the problem, and replace the damaged fuse with a new, rated fuse.
CAUTION: DISCONNECT the DC power cable
from the transceiver when changing a fuse.
The IC-746PRO has 2 types of fuses installed for
transceiver protection.
• DC power cable fuses ................................ FGB 30 A
• Circuitry fuse ................................................ FGB 5 A
D DC power cable fuse replacement
30 A
fuse
Refer the figure illustrated at right for the DC power
cable fuse replacement.
D Circuitry fuse replacement
The 13.8 V DC from the DC power cable is applied to
all units in the IC-746PRO, except for the power amplifier, through the circuitry fuse. This fuse is installed in
the PA unit.
q Remove the top cover as shown on p. 89.
w Remove 11 screws from the PA shielding plate, then
remove the plate.
e Replace the circuitry fuse as shown in the diagram
at right.
r Replace the PA shielding plate and top cover.
Fuse
■ Tuning dial brake adjustment
The tension of the tuning dial may be adjusted to suit
your preference.
The brake adjustment screw is located on the right
side of the tuning dial. See the figure at right.
Turn the brake adjustment screw clockwise or counterclockwise to obtain a comfortable tension level while
turning the dial continuously and evenly in one direction.
Light
Heavy
93
MAINTENANCE
13
■ Resetting the CPU
When first applying power or when the function seems
to be displaying erroneous information, reset the CPU
as follow:
[POWER]
[F-INP] [M-CL]
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.
• 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.
NOTE: Resetting CLEARS all programmed contents in memory channels and returns programmed
values in set mode to default values.
■ Frequency calibration (approximate)
A very accurate frequency counter is required to calibrate the frequency of the transceiver. However, a
rough check may be performed by receiving radio station WWV, or other standard frequency signals.
CAUTION: Your transceiver has been thoroughly
adjusted and checked at the factory before being
shipped. You should not calibrate frequencies, except for special reasons.
[MENU] [SSB]
[PBTC]
q Push [SSB] to select USB mode.
w Push [PBTC] for 1 sec. to clear the PBT settings
and make sure that the RIT/∂TX function is not activated.
e Set the frequency to the standard frequency station
minus 1 kHz.
• When receiving WWV (10.000.00 MHz) as a standard
frequency, set the operating frequency for 9.999.00 MHz.
• Other standard frequencies can also be used.
r Push [MENU] several times to select M1 or M2, if
necessary.
t Push [MENU] for 1 sec. to select the set mode
screen.
y Push [F1 ≤] or [F2 ≥] several times to select the
CAL. Marker item.
u Rotate the tuning dial clockwise to turn the calibration marker ON.
[RF/SQL] [AF] [P.AMP/ATT]
[RIT] [CLEAR]
• Calibration marker item
CAL.
Marker
ON
• Side tone may be heard.
i Adjust [CAL] pot on the rear side of the transceiver
for a zero beat with the received standard signal.
• Zero beat means that two signals are exactly the same
frequency, resulting in a single tone being emitted.
o Rotate the tuning dial counterclockwise to turn the
calibration marker OFF.
!0 Push [MENU] to exit set mode.
[CAL]
94
14
CONTROL COMMAND
■ Remote jack (CI-V) information
• CI-V connection example
The transceiver can be connected through an optional
CT-17 CI-V LEVEL CONVERTER to a personal computer
equipped with an RS-232C port. The Icom Communications Interface-V (CI-V) controls the following functions of the transceiver.
IC-746PRO
9–15 V
DC
Up to 4 Icom CI-V transceivers or transceivers can be
connected to a personal computer equipped with an
RS-232C port. See p. 87 for setting the CI-V condition
using set mode.
BC-25
(optional)
personal
computer
ct- 17
• Data format
mini-plug cable
The CI-V system can be operated using the following
data formats. Data formats differ according to command numbers. A data area or sub command is added
for some commands.
OK message to controller
Cn
Sc
Data area
FD
FE FE
E0
66
FA
FD
End of message
code (fixed)
66
(fixed)
E0
FB
(fixed)
FE FE
(see the command table)
Transceiver’s
default address
66
Controller’s
default address
E0
Preamble
code (fixed)
FE FE
End of message
code (fixed)
FD
NG code OK code
Data area
BCD code data for
frequency or memory
number entry
Sc
Sub command number
(see command table)
Cn
Controller’s
default address
E0
Transceiver’s
default address
66
Preamble
code (fixed)
FE FE
Command number
Controller to IC-746PRO
FD
IC-746PRO to controller
NG message to controller
• Command table
Command
—
01
Same as
command 06
Description
Command
Send frequency data
07
Send mode data
08
Sub command
Description
B0
Exchange VFO A and VFO B
—
Select memory mode
0001–0101*
Select memory channel
*P1=0100, P2=0101
02
—
Read band edge frequencies
03
—
Read operating frequency
04
—
Read operating mode
09
—
Memory write
05
—
Set operating frequency
0A
—
Memory to VFO
06
00
01
02
03
04
05
07
08
Select LSB
Select USB
Select AM
Select CW
Select RTTY
Select FM
Select CW-R
Select RTTY-R
0B
—
Memory clear
0C
—
Read offset frequency
0D
—
Set offset frequency
0E
—
00
01
A0
Select VFO mode
Select VFO A
Select VFO B
Equalize VFO A and VFO B
00
01
02
03
12
13
22
23
Scan stop
Programmed/memory scan start
Programmed scan start
∂F scan start
Fine programmed scan start
Fine ∂F scan start
Memory scan start
Select memory scan start
07
95
Sub command
00
0102
Select the call channel
CONTROL COMMAND
14
• Command table (continued)
Command
Sub command
Description
Command
Sub command
Description
12
AGC selection (0=OFF; 1=Slow;
2=Mid; 3=Fast)
Noise blanker (0=OFF; 1=ON)
Noise reduction (0=OFF; 1=ON)
Auto notch (0=OFF; 1=ON)
Repeater tone (0=OFF; 1=ON)
Tone squelch (0=OFF; 1=ON)
Speech compressor (0=OFF; 1=ON)
Monitor (0=OFF; 1=ON)
VOX function (0=OFF; 1=ON)
Break-in (0=OFF; 1=semi breakin; 2=full break-in)
Manual notch (0=OFF; 1=ON)
RTTY filter (0=OFF; 1=ON)
DTCS (0=OFF; 1=ON)
VSC (0=OFF; 1=ON)
B0
B1
D0
D3
Set ∂F scan span (A1=±5 kHz,
A2=±10 kHz, A3=±20 kHz,
A4=±50 kHz, A5=±100 kHz,
A6=±500 kHz, A7=±1 MHz)
Set as non-select channel
Set as select channel
Set scan resume OFF
Set scan resume ON
0F
00
01
10
11
12
Turn the split function OFF
Turn the split function ON
Select simplex operation
Select –DUP operation
Select +DUP operation
10
00
01
02
03
04
05
06
07
08
Select 10 Hz (1 Hz) tuning step
Select 100 Hz tuning step
Select 1 kHz tuning step
Select 5 kHz tuning step
Select 9 kHz tuning step
Select 10 kHz tuning step
Select 12.5 kHz tuning step
Select 20 kHz tuning step
Select 25 kHz tuning step
11
—
Select/read attenuator (0=OFF,
1=ON)
02
12
—
Select/read antenna selection
(0=ANT1, 1=ANT2)
03
13
00
01
02
Announce with voice synthesizer
(00=all data; 01=frequency and
S-meter level; 02=receive mode)
0E
14
15
16
A1–A7
01 + Level data [AF] level setting (0=max. CCW to
255=max. CW)
02 + Level data [RF] level setting (0=max. CCW to
255=11 o’clock)
03 + Level data [SQL] level setting (0=11 o’clock to
255=max. CW)
06 + Level data [NR] level setting (0=min. to
255=max.)
07 + Level data Inside [TWIN PBT] setting or IF
shift setting (0=max. CCW,
128=center, 255=max. CW)
08 + Level data Outside [TWIN PBT] setting
(0=max. CCW, 128=center,
255=max. CW)
09 + Level data [CW PITCH] setting (0=300 Hz,
128=600 Hz, 255=900 Hz)
0A + Level data [RF PWR] setting (0=mini. to
255=max.)
0B + Level data [MIC GAIN] setting (0=mini. to
255=max.)
0C + Level data [KEY SPEED] setting (0=slow to
255=fast)
0D + Level data [NOTCH] setting (0=low freq. to
255=high freq.)
0E + Level data COMP Level Delay setting (0=0 to
10=10)
0F + Level data Break-IN DELAY setting (20=2.0d
to 130=13.0d)
01
02
11
12
13
Read squelch condition
Read S-meter level
Read RF power meter
Read SWR meter
Read ALC meter
02
Preamp (0=OFF; 1=preamp 1;
2=preamp 2)
16
22
40
41
42
43
44
45
46
47
48
49
4B
4C
19
00
Read the transceiver ID
1A
00
Send/read memory contents (see
p. 97 for details)
Send/read band stacking register
contents (see p. 97 for details)
Send/read memory keyer contents (see p. 97 for details)
Send/read the selected filter width
(0=50 Hz to 40/31=3600/2700 Hz)
Send/read the selected AGC time
constant (0=OFF, 1=0.1/0.3 sec. to
13=6.0/8.0 sec.)
Send/read LCD contrast (0=0% to
255=100%)
Send/read LCD backlight (0=0% to
255=100%)
Send/read beep gain (0=min. to
255=max.)
Send/read beep gain limit (0=OFF,
1=ON)
Send/read calibration marker
(0=OFF, 1=ON)
Send/read confirmation beep
(0=OFF, 1=ON)
Send/read band edge beep
(0=OFF, 1=ON)
Send/read RF/SQL control set
(0=Auto, 1=SQL, 2=RF+SQL)
Send/read meter peak hold set
(0=OFF, 1=ON)
Send/read COMP meter set
(0=OFF, 1=ON)
Send/read quick split set (0=OFF,
1=ON)
Send/read split offset –9.999 to
+9.999 MHz (see p. 98 for details)
Send/read split lock set (0=OFF,
1=ON)
Send/read duplex offset 0.000 to
9.999 MHz for HF (see p. 98 for
details)
Send/read duplex offset 0.000 to
9.999 MHz for 50 MHz band (see
p. 98 for details)
Send/read duplex offset 0.000 to
9.999 MHz for 144 MHz band
(see p. 98 for details)
01
04
0501
0502
0503
0504
0505
0506
0507
0508
0509
0510
0511
0512
0513
0514
0515
0516
96
14
CONTROL COMMAND
• Command table (continued)
Command
1A
Sub command
Description
0517
Send/read one touch repeater set
(0=DUP–, 1=DUP+)
Send/read auto repeater set
(0=OFF, 1=ON-1, 2=ON-2)
Send/read tuner auto start set
(0=OFF, 1=ON)
Send/read PTT tune set (0=OFF,
1=ON)
Send/read 9600 bps mode set
(0=OFF, 1=ON)
Send/read antenna selection
(0=OFF, 1=Manual, 2=Auto)
Send/read speech language
(0=English, 1=Japanese)
Send/read speech speed (0=Slow,
1=Fast)
Send/read S-level speech (0=OFF,
1=ON)
Send/read memo pad numbers
(0=5 ch, 1=10 ch)
Send/read main dial auto TS
(0=OFF, 1=Low, 2=High)
Send/read mic. up/down speed
(0=Low, 1=High)
Send/read quick RIT/∂TX clear
function (0=OFF, 1=ON)
Send/read PBT shifting value
popup set (0=OFF, 1=ON)
Send/read IF filter width popup
set (0=OFF, 1=ON)
Send/read SSB/CW synchronous
tuning function (0=OFF, 1=ON)
Send/read CW normal side set
(0=LSB, 1=USB)
Send/read keyer 1st menu set
(0=Keyer-root, 1=Keyer-send)
Send/read external keypad set
(0=OFF, 1=Keyer send)
Send/read CI-V transceive set
(0=OFF, 1=ON)
Send/read CI-V 731 mode set
(0=OFF, 1=ON)
Send/read speech compressor
level set (0=0 to 10=10)
Send/read SSB TX Tone (Bass)
level (0 =–5 to 10=+5)
Send/read SSB TX Tone (Treble)
level (0=–5 to 10=+5)
Send/read SSB RX Tone (Bass)
level (0 =–5 to 10=+5)
Send/read SSB RX Tone (Treble)
level (0=–5 to 10=+5)
Send/read AM TX Tone (Bass)
level (0 =–5 to 10=+5)
Send/read AM TX Tone (Treble)
level (0=–5 to 10=+5)
Send/read AM RX Tone (Bass)
level (0 =–5 to 10=+5)
Send/read AM RX Tone (Treble)
level (0=–5 to 10=+5)
Send/read FM TX Tone (Bass)
level (0 =–5 to 10=+5)
0518
0519
0520
0521
0522
0523
0524
0525
0526
0527
0528
0529
0530
0531
0532
0533
0534
0535
0536
0537
0538
0539
0540
0541
0542
0543
0544
0545
0546
0547
97
Command
1A
Sub command
Description
0548
Send/read FM TX Tone (Treble)
level (0=–5 to 10=+5)
Send/read FM RX Tone (Bass)
level (0 =–5 to 10=+5)
Send/read FM RX Tone (Treble)
level (0=–5 to 10=+5)
Send/read contact number style
(0=Normal, 1=190→ANO,
2=190→ANT, 3=90→NO,
4=90→NT)
Send/read count up trigger channel (1=M1, 2=M2, 3=M3, 4=M4)
Send/read present number
(1–9999)
Send/read CW side tone gain
(0=min. to 255=max.)
Send/read CW side tone gain limit
(0=OFF, 1=ON)
Send/read CW keyer repeat time
(1=1 sec. to 60=60 sec.)
Send/read CW keyer dot/dash
ratio (28=1:1:2.8 to 45=1:1:4.5)
Send/read rise time (0=2 msec.,
1=4 msec., 2=6 msec., 3=8 msec.)
Send/read paddle polarity
(0=Normal, 1=Reverse)
Send/read keyer type (0=Straight,
1=Bug-key, 2=ELEC-Key)
Send/read mic. up/down keyer set
(0=OFF, 1=ON)
Send/read RTTY filter bandwidth
(0=250 Hz, 1=300 Hz, 2=350 Hz,
3=500 Hz, 4=1 kHz)
Send/read twin peak filter (0=OFF,
1=ON)
Send/read RTTY mark frequency
(0=1275 Hz, 1=1615 Hz,
2=2125 Hz)
Send/read RTTY shift width
(0=170 Hz, 1=200 Hz, 2=425 Hz)
Send/read RTTY keying polarity
(0=Normal, 1=Reverse)
Send/read RTTY decode USOS
(0=OFF, 1=ON)
Send/read RTTY decode new line
code (0=CR,LF,CR+LF, 1=CR+LF)
Send/read number of RTTY decoder line (0=2 lines, 1=3 lines)
Send/read scan speed (0=Low,
1=High)
Send/read scan resume (0=OFF,
1=ON)
Send/read NB level (0=0% to
255=100%)
Send/read VOX gain (0=0% to
255=100%)
Send/read anti VOX gain (0=0% to
255=100%)
Send/read VOX delay (0=0.0 sec.
to 20=2.0 sec.)
Send/read Break-IN delay set
(20=2.0d to 130=13.0d)
0549
0550
0551
0552
0553
0554
0555
0556
0557
0558
0559
0560
0561
0562
0563
0564
0565
0566
0567
0568
0569
0570
0571
0572
0573
0574
0575
0576
CONTROL COMMAND
• Command table (continued)
Command
Sub command
Description
0577
Send/read MONITOR level (0=0%
to 255=100%)
Send/read DATA mode (0=OFF,
1=ON)
Send/read SSB transmit bandwidth (0=WIDE, 1=MID, 2=NAR)
Send/read DSP filter shape
(0= sharp, 1= soft)
1A
06
07
08
1B
00
Set/read repeater tone frequency
(see p. 98 for details)
Set/read TSQL tone frequency
(see p. 98 for details)
Set/read DTCS code and polarity
(see p. 98 for details)
01
02
1C
00
Set/read the transceiver’s condition (0=Rx; 1=Tx)
Set/read antenna tuner condition
(0=OFF, 1=ON, 2=Start tuning or
while tuning)
01
D To send/read memory contents
When sending or reading memory contents, additional code
as follows must be added to appoint the memory channel.
➥ Additional code: 0000–0102 (0100=P1, 0101=P2, 0102=Call)
D Band stacking register
To send or read the desired band stacking register ’s contents, combined code of the frequency band and register
codes as follows are used.
For example, when sending/reading the oldest contents in
the 21 MHz band, the code “0703” is used.
• Frequency band code
Code
01
02
03
04
05
06
07
08
09
10
11
12
Frequency band Frequency range (unit: MHz)
1.8
1.800000– 1.999999
3.5
3.400000– 4.099999
6.900000– 7.499999
10
9.900000–10.499999
14
13.900000–14.499999
18
17.900000–18.499999
21
20.900000–21.499999
24
24.400000–25.099999
28
28.000000–29.999999
50
50.000000–54.000000
144
144.000000–148.000000
GENE
Other than above
• Register code
Code
01
02
03
14
D Codes for memory keyer contents
To send or read the desired memory keyer contents, the
channel and character codes as follows are used.
• Channel code
Code
01
02
03
04
Channel number
M1
M2
M3
M4
• Character’s code
Character ASCII code
0–9
30–39
A–Z
41–5A
space
20
2F
3F
2C
2E
5E
✱
2A
Description
Numerals
Alphabetical characters
Word space
Symbol
Symbol
Symbol
Symbol
e.g., to send BT, enter ^4254
Inserts contact number (can be
used for 1 channel only)
D Codes for memory name contents
To send or read the desired memory name settings, the character codes, instructed codes for memory keyer contents as
above, and follows are additionally used.
• Character’s code— Alphabetical characters
Character
a–z
ASCII code
61–7A
Character
—
ASCII code
—
• Character’s code— Symbols
Character
’
ASCII code
21
24
26
3F
27
2B
3A
3D
3E
29
5D
7D
5F
Character
¥
”
–
–
ASCII code
23
25
5C
22
60
2D
3B
3C
28
5B
7B
7C
7E
Registered number
1 (latest)
3 (oldest)
98
14
CONTROL COMMAND
D Split/Duplex frequency setting
The following data sequence is used when sending/reading
the split or duplex frequency setting.
r*
1 MHz digit: 0–4
10 kHz digit: 0–9
XX
Direction:
00=+ direction
01=– direction
10 MHz digit: 0 (fixed)
100 kHz digit: 0–9
100 Hz digit: 0 (fixed)
1 kHz digit: 0–9
*Not need to enter for duplex frqeuency setting.
D Repeater tone/tone squelch frequency setting
0.1 Hz digit: 0–9
1 Hz digit: 0–9
10 Hz digit: 0–9
100Hz digit: 0–2
Fixed digit: 0*
Fixed digit: 0*
The following data sequence is used when sending/reading
the DTCS code and polarity setting.
q*
*Not necessary when setting a frequency.
D DTCS code and polarity setting
The following data sequence is used when sending/reading
the DTCS code and polarity setting.
99
2nd digit: 0–7
3rd digit: 0–7
1st digit: 0–7
Transmit polarity:
0= Normal
1= Reverse
Receive polarity:
0= Normal
1= Reverse
Fixed digit: 0
SPECIFICATIONS
• General
• Frequency coverage
Receive
Transmit
• Receiver
(Unit: MHz)
0.030– 60.000000*
108.000– 174.000000*
1.800–
2.000000
3.500–
3.999999
7.000–
7.300000
10.100– 10.150000
14.000– 14.350000
18.068– 18.168000
21.000– 21.450000
24.890– 24.990000
28.000– 29.700000
50.000– 54.000000
144.000– 148.000000
*Some frequency ranges are not guaranteed.
• Mode
• No. of memory ch.
: USB, LSB, CW, RTTY, AM, FM
: 102 (99 regular, 2 scan edges and 1
call)
• Antenna connector
: SO-239×3 (2 for HF/50 MHz and 1
• Usable temp. range
• Frequency stability
: –10˚C to +60˚C ; +14˚F to +140˚F
: Less than ±7 ppm from 1 min. to
60 min. after power ON. After
that, rate of stability is less than
±1 ppm/hr. at 25˚C (+77˚F).
Temperature fluctuations 0˚C to
+50˚C (+20˚F to +122˚F) less than
±5 ppm.
: 1 Hz
: 13.8 V DC ±15% (negative ground)
Max. power
23.0 A
Standby
2.2 A
Max. audio
3.0 A
: 287(W)×120(H)×316.5(D) mm
135⁄16(W)×423⁄32(H)×1215⁄32(D) in
: 9.0 kg; 19 lb 13 oz
: 8-pin DIN connector
: 7-pin DIN connector
: Mini DIN 6-pin
: 2-conductor 3.5 (d) mm (1⁄8″)
for 144 MHz; 50 Ω)
• Frequency resolution
• Power supply
• Power consumption
Transmit
Receive
• Dimensions
(projections not incl.)
• Weight (approx.)
• ACC 1 connector
• ACC 2 connector
• DATA connector
• CI-V connector
15
• Transmitter
• Output power (continuously adjustable):
SSB/CW/RTTY/FM
Less than 5 to 100 W
AM
Less than 5 to 40 W
• Modulation system
Digital PSN modulation
SSB
AM
Digital low power modulation
FM
Digital phase modulation
• Spurious emission
: 50 dB (HF bands)
60 dB (50/144 MHz)
• Carrier suppression
: 40 dB
• Unwanted sideband
: 55dB
suppression
• ∂TX variable range
: ±9.99 kHz
• Mic. connector
: 8-pin connector (600 Ω)
• ELEC-KEY connector : 3-conductor 6.35(d) mm (1⁄4″)
• KEY connector
: 3-conductor 6.35(d) mm (1⁄4″)
• SEND connector
: Phono (RCA)
• ALC connector
: Phono (RCA)
• Receive system
: Triple conversion
superheterodyne system
• Intermediate frequencies:
1st
64.455 MHz
2nd
455 kHz
3rd
36 kHz
• Sensitivity (typical)
SSB, CW, RTTY
0.16 µV*1 (1.80–29.99 MHz)
0.13 µV*2 (50 MHz)
(10 dB S/N)
0.11 µV*3 (144 MHz)
AM (10 dB S/N)
13 µV (0.5–1.799 MHz)
2 µV*1 (1.80–29.99 MHz)
1 µV (50*2/144*3 MHz)
FM (12 dB SINAD)
0.5 µV*1 (28.0–29.99 MHz)
0.25 µV*2 (50 MHz)
0.18 µV*3 (144 MHz)
*1Pre-amp 1 is ON, *2Pre-amp 2 is ON, *3Pre-amp is ON
• Squelch sensitivity (Pre-amp: OFF):
SSB, CW, RTTY
Less than 5.6 µV
FM
Less than 1.0 µV
• Selectivity
More than 2.4 kHz/–6 dB
SSB (BW: 2.4 kHz)
Less than 3.6 kHz/–60 dB
More than 500 Hz/–6 dB
CW (BW: 500 Hz)
Less than 700 Hz/–60 dB
RTTY (BW: 350 Hz)
More than 360 Hz/–6 dB
Less than 650 Hz/–60 dB
More than 6.0 kHz/–6 dB
AM (BW: 6 kHz)
Less than 15.0 kHz/–60 dB
More than 12.0 kHz/–6 dB
FM (BW: 15 kHz)
Less than 20.0 kHz/–60 dB
• Spurious and image rejection ratio:
HF/50 MHz
More than 70 dB (except IF through
on 50 MHz band)
144 MHz
• AF output power
(at 13.8 V DC)
• RIT variable range
• PHONES connector
• Ext. SP connector
More than 60 dB
: More than 2.0 W at 10% distortion
with an 8 Ω load
: ±9.99 kHz
: 3-conductor 6.35 (d) mm (1⁄4″)
: 2-conductor 3.5 (d) mm (1⁄8″)/8 Ω
• Antenna tuner
• Matching impedance range:
HF bands
16.7 to 150 Ω unbalanced
(Less than VSWR 3:1)
50 MHz band
20 to 125 Ω unbalanced
(Less than VSWR 2.5:1)
• Minimum operating input power
: 8 W (HF bands)
15 W (50 MHz band)
• Tuning accuracy
: VSWR 1.5:1 or less
• Insertion loss
: Less than 1.0 dB (after tuning)
All stated specifications are typical and subject to change without notice or obligation.
100
16
OPTIONS
IC-PW1 HF/50 MHz ALL BAND 1 kW LINEAR AMPLIFIER
PS-125 DC POWER SUPPLY
Full-duty 1 kW linear amplifier including an automatic antenna tuner. Has
automatic tuning and band selection capability. Full break-in (QSK) operation is possible. The amplifier/power supply unit and the remote control
unit are separated.
Light weight switching regulator
system power supply.
AH-4 HF/50 MHz AUTOMATIC
ANTENNA TUNER
SM-20 DESKTOP MICROPHONE
AH-2b ANTENNA ELEMENT
• Output voltage: 13.8 V DC
• Max. current drain: 25 A
A 2.5 m long antenna element for
mobile operation
with the AH-4.
Specially designed to tune a long
wire antenna for portable or mobile
HF operation. The PTT tuner start
function provides simple operation.
• Frequency
coverage:
7–54 MHz bands
with the AH-4
• Input power rating: 120 W
SP-21 EXTERNAL SPEAKER
CT-17 CI-V LEVEL CONVERTER
Unidirectional, electret microphone
for base station operation. Includes
[UP]/[DOWN] switches and a low
cut function.
UT-102 VOICE SYNTHESIZER UNIT
Announces the receive frequency, mode
and S-meter level in a clear, electronically-generated voice, in English (or
Japanese).
SP-20 EXTERNAL SPEAKER
4 audio filters; headphone jack; can connect to 2 transceivers.
• Input impedance: 8 Ω
• Max. input power: 5 W
Designed for base station operation.
• Input impedance: 8 Ω
• Max. input power: 5 W
For remote transceiver control
using a personal computer. You
can change frequencies, operating
mode, memory channels, etc.
CR-338 HIGH STABILITY CRYSTAL
UNIT
Contains a temperature-compensating
oven heater and crystal unit for improved
frequency stability.
• Frequency stability: ±0.5 ppm
HM-36 HAND MICROPHONE
Hand microphone equipped
[UP]/[DOWN] switches.
101
with
A-6085H-1EX
Printed in Japan
© 2001 Icom Inc.
1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003 Japan

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Modify Date                     : 2001:12:06 13:08:35
Title                           : 746PRO_INSTRUCTION_MANUAL(EN.pd.PDF
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Create Date                     : 2001:12:06 13:07:43
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