ICOM orporated 361500 HF/50 MHz Transceiver User Manual

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THE TRANSCEIVER
i7850
Instruction Manual
A-7199H-1EX-??
Printed in Japan
© 2014 Icom Inc.
FOREWORD
Congratulations! You are the owner of the world’s most advanced amateur
HF/50 MHz transceiver— IC-7850. The IC-7850 is designed and built with
Icom’s superior technology and craftsmanship. With proper care, this product should provide you with years of trouble-free operation.
We would like to take a few moments of your time to thank you for making
the IC-7850 your radio of choice, and hope you agree with Icom’s philosophy of “technology first.” Many hours of research and development went
into the design of your IC-7850.
D FEATURES
❍ Ultimate receiver performance: third-order intercept (IP3) of
+40 dBm (HF bands only), both main and sub
❍ Independent identical receiver circuits for main and sub
bands provide perfect no-compromise Dualwatch operation
❍ Built-in Baudot RTTY and PSK31 modulator/demodulator
and direct PC keyboard connection capability for RTTY and
PSK31 operation without a PC
❍ Upgraded real-time spectrum scope— center frequency and
fix frequency modes, plus mini-scope displays
IMPORTANT
READ THIS INSTRUCTION MANUAL CAREFULLY before attempting to operate the transceiver.
SAVE THIS INSTRUCTION MANUAL. This manual contains important safety and operating instructions for the IC-7850.
EXPLICIT DEFINITIONS
WORD
DEFINITION
R DANGER! Personal death, serious injury or an explosion may occur.
R WARNING! Personal injury, fire hazard or electric shock may occur.
CAUTION
Equipment damage may occur.
Recommended for optimum use. No risk of personal
NOTE
injury, fire or electric shock.
TRADEMARKS
Icom, Icom Inc. and the Icom logo are registered trademarks of Icom Incorporated (Japan) in Japan, the United States, the United Kingdom, Germany, France, Spain, Russia and/or other countries.
PRECAUTIONS
R DANGER HIGH RF VOLTAGE! NEVER
DO NOT use harsh solvents such as benzine or al-
attach an antenna or internal antenna connector during transmission. This may result in an electrical shock
or burn.
cohol when cleaning, as they can damage the transceiver’s surfaces.
R WARNING! NEVER operate the transceiver
DO NOT push the PTT switch when you don’t actually desire to transmit.
with a headset or other audio accessories at high volume levels. Hearing experts advise against continuous
high volume operation. If you experience a ringing in
your ears, reduce the volume or discontinue use.
DO NOT use or place the transceiver in areas with
temperatures below ±0°C (+32°F) or above +50°C
(+122°F).
R WARNING! NEVER operate or touch the
DO NOT place the transceiver in excessively dusty
environments or in direct sunlight.
transceiver with wet hands. This may result in an electric shock or damage to the transceiver.
DO NOT place the transceiver against walls or putting anything on top of the transceiver. This may overheat the transceiver.
R WARNING! NEVER let metal, wire or other
objects protrude into the transceiver or into connectors on the rear panel. This may result in an electric
shock.
Always place unit in a secure place to avoid inadvertent use by children.
R WARNING! Immediately turn the transceiver
BE CAREFUL! If you use a linear amplifier, set the
transceiver’s RF output power to less than the linear
amplifier’s maximum input level, otherwise, the linear
amplifier will be damaged.
power OFF and remove the power cable if it emits an
abnormal odor, sound or smoke. Contact your Icom
dealer or distributor for advice.
CAUTION: NEVER put the transceiver in any un-
BE CAREFUL! NEVER touch the transceiver top
cover when transmitting continuously for long periods.
The top cover may be hot.
stable place (such as on a slanted surface or vibrated
place). This may cause injury and/or damage to the
transceiver.
Use Icom microphones only (supplied or optional).
Other manufacturers’ microphones have different pin
assignments, and connection to the IC-7850 may damage the transceiver or microphone.
CAUTION: NEVER change the internal settings of
the transceiver. This may reduce transceiver performance and/or damage to the transceiver.
In particular, incorrect settings for transmitter circuits,
such as output power, idling current, etc., might damage the expensive final devices.
The LCD display may have cosmetic imperfections
that appear as small dark or light spots. This is not a
malfunction or defect, but a normal characteristic of
LCD displays.
The transceiver warranty does not cover any problems
caused by unauthorized internal adjustment.
During maritime mobile operation, keep the transceiver and microphone as far away as possible from
the magnetic navigation compass to prevent erroneous indications.
CAUTION: NEVER block any cooling vents on the
top, rear or bottom of the transceiver.
CAUTION: NEVER expose the transceiver to rain,
Turn [I/O] switch (on the rear panel) OFF and/or disconnect the AC power cable from the AC outlet when
you will not use the transceiver for long period of
time.
snow or any liquids.
CAUTION: NEVER install the transceiver in a
place without adequate ventilation. Heat dissipation
may be reduced, and the transceiver may be damaged.
CAUTION: The line-voltage receptacle must be
near the transceiver and must be easily accessible.
Avoid extension cords.
CAUTION: The transceiver weighs approximately
25 kg (55 lb). Always have two people available to
carry, lift or turn over the transceiver.
ii
SUPPLIED ACCESSORIES
!0
!4
!5
!1
!2
!3
!6
!0 3-conductor 1⁄8″ plugs������������ 2
!1 3-conductor 1⁄4″ plugs������������ 3
!2 ACC plugs (7-pin) ������������� 2
!3 ACC plugs (8-pin) ������������� 2
!4 Hexagonal driver�������������� 1
!5 Main dial*2 ���������������� 1
!6 CD (Instruction Manual)����������� 1
*1May differ from that shown depending on the version
*2See the “Information—About the Main Dial” leaflet that
q AC power cable*1 ������������� 1
w Rack mounting handles��������� 1 pair
e Screws for rack mounting handles ���� 1 set
r SD card������������������ 1
t Stands ���������������� 1 pair
y Spare fuse (2 A) �������������� 1
u RCA plugs ���������������� 2
i DC power plug��������������� 1
o 2-conductor 1⁄8″ plugs������������ 3
comes with the IC-7850, for dial attachment details.
FCC INFORMATION
FOR CLASS B UNINTENTIONAL RADIATORS
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part
15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference to radio communications. However,
there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the
user is encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
CAUTION: Changes or modifications to this device, not expressly approved by Icom Inc., could void
your authority to operate this device under FCC regulations.
iii
PANEL DESCRIPTION
■
■
■
■
■
Section
Front panel………………………………………………………………… 1-2
Rear panel… ……………………………………………………………… 1-12
Accessory connector information… …………………………………… 1-14
LCD display………………………………………………………………… 1-15
Screen menu arrangement… …………………………………………… 1-17
1-1
1
PANEL DESCRIPTION
■ Front panel
@2 @1
@0
!9 !8 !7
!0
!1
!2
!3
q POWER KEY [POWER] (p. ?3-2)
!4
!5
!6
r TIMER KEY [TIMER] (p. ?11-4)
➥ Push to turn ON or OFF the sleep or daily timer
function.
Turn the internal power supply ON in advance. The
internal power supply switch is located on the rear
panel. (p. 3-2)
• The [TIMER] indicator above this key lights white
when the timer is in use.
➥ Hold down for 1 second to enter the Timer set
screen.
➥ Push to turn the transceiver power ON.
• The [POWER] indicator above this key lights blue
when powered ON.
t HEADPHONE JACK [PHONES]
Accepts standard stereo headphones.
➥ Hold down for 1 second to turn the transceiver
power OFF.
• Output power: 50 mW with an 8 Ω load.
• When headphones are connected, the internal speaker
or connected external speaker does not function.
• The [POWER] indicator lights orange when the transceiver is OFF when the internal power supply is
switched ON.
y	E LECTRONIC KEYER JACK [ELEC-KEY] (p.
?2-4)
	Accepts a paddle to activate the internal electronic
keyer for CW operation.
w TRANSMIT KEY [TRANSMIT]
Selects transmitting or receiving.
• The [TX] indicator lights red while transmitting and the
[RX] indicator lights green when the squelch is open.
• You can select internal electronic keyer, bug-key or
straight key operation in the Keyer set screen. (p. ?412)
• A straight key jack is located on the rear panel. See
[KEY] on p. ?1-13.
• Keyer polarity (dot and dash) can be reversed in the
Keyer set screen. (p. ?4-12)
• 8-channel memory keyer is available for your convenience. (p. ?4-8)
e ANTENNA TUNER KEY [TUNER] (p. ?10-5)
➥ Turns the internal antenna tuner ON or OFF (bypass) when pushed momentarily.
• The [TUNER] indicator above this key lights white
when the tuner is turned ON, goes off when tuner is
turned OFF (bypassed).
➥ Tunes the antenna tuner manually when held
down for 1 second.
(dot)
(com)
(dash)
• The [TUNER] indicator blinks red during manual tuning.
• When the tuner cannot tune the antenna, the tuning
circuit is bypassed automatically after 20 seconds.
1-2
PANEL DESCRIPTION
u MICROPHONE CONNECTOR [MIC]
Accepts an optional microphone.
!9	ELECTRONIC CW KEYER SPEED CONTROL
[KEY SPEED] (p. ?4-4)
Adjusts the internal electronic CW keyer’s speed.
• See p. ?15-4 for appropriate microphones.
• See p. ?2-10 for microphone connector information.
• 6 wpm (minimum) to 48 wpm (maximum) can be set.
• The keyer’s speed is displayed.
i SD CARD SLOT [SD CARD] (p. ??-?)
Insert the supplied SD card for both reading/storing a
wide variety of the transceiver’s information and data.
@0 VOX/BREAK-IN KEY [VOX/BK-IN]
➥ Push to turn the VOX function ON or OFF in the
SSB, AM, or FM mode operation. (p. ?6-2)
➥ Push to turn the break-in function ON (Semi
break-in, Full break-in) or OFF during CW mode
operation. (p. ?6-3)
➥ Hold down for 1 second to enter VOX set screen.
(p. ?6-2)
• The indicator beside the slot lights or blinks when the
transceiver reads or writes to the card.
• Push the card to remove the card card.
o USB INDICATOR [USB]
Lights while accessing the USB flash drive inserted
to the [USB A] port.
✔ What is the VOX function?
!0	M ONITOR GAIN CONTROL [MONI GAIN] (p.
?6-4)
Adjusts the transmit IF signal monitor level.
The VOX function (voice operated transmission) starts transmission without pushing the transmit key or PTT switch when
you speak into the microphone; then, automatically returns
to receive when you stop speaking.
!1	COMPRESSION LEVEL CONTROL [COMP]
(p. ?6-5)
Adjusts the speech compression level in SSB.
✔ What is the break-in function?
The break-in function toggles between transmit and receive
with CW keying. Full break-in (QSK) can monitor the receive
signal during keying.
!2 DRIVE GAIN CONTROL [DRIVE] (p. ?3-13)
Adjusts the transmitter level at the driver stage. Activate in all modes (except SSB with [COMP] OFF).
@1 RF POWER CONTROL [RF PWR] (p. ?3-12)
	Continuously varies the RF output power from minimum (5 W*) to maximum (200 W*).
!3 VOX GAIN CONTROL [VOX GAIN] (p. ?6-2)
Adjusts the transmit/receive switching threshold
level for VOX operation.
*AM mode: 5 W to 50 W
• The output power is displayed.
!4 ANTI VOX CONTROL [ANTI VOX] (p. ?6-2)
Adjusts the VOX deactivate level to prevent unwanted VOX activation from the speaker audio.
@2 MIC GAIN CONTROL [MIC]
Adjusts microphone gain.
• The transmit audio tone in the SSB, AM, or FM mode
can be adjusted independently in the Level set screen.
(p. ?12-4)
!5	DISPLAY CONTRAST CONTROL [CONTRAST]
Adjusts the display contrast.
!6	DISPLAY BRIGHTNESS CONTROL [BRIGHT]
Adjusts the display brightness.
✔ How to set the microphone gain.
Set the [MIC] control so that the ALC meter swings within
the ALC range during normal voice level transmission in the
SSB or AM mode. (The ALC meter must be selected.)
!7 MONITOR KEY [MONI] (p. ?6-4)
Monitors your transmitted IF signal.
Recommended level for
an Icom microphone
• The CW sidetone functions regardless of [MONI] key
setting in CW mode.
• The [MONI] indicator above this key lights white while
the function is activated.
Decreases
!8 BREAK-IN DELAY CONTROL [DELAY] (p. ?6-3)
Adjusts the transmit-to-receive switching delay time
for CW semi-break-in operations.
1-3
Increases
1
PANEL DESCRIPTION
■ Front panel (Continued)
#1
#0
@9
@3
@4
@5
@6
@7
@8
@3 AGC CONTROL [AGC] (p. ?5-12)
Adjusts the continuously-variable AGC circuit time
constant.
@8 MODE KEYS
Selects the desired mode. (p. ?3-8)
• Announces selected mode via the speech synthesizer.
(p. ?12-17)
• To use [AGC] control, push the appropriate band’s
[AGC VR] ([AGC VR] indicator lights white).
➥ Selects USB or LSB modes alternately.
@4	AGC VOLUME KEY [AGC VR] (p. ?5-12)
➥ Push to toggle [AGC] control usage ON or OFF.
➥ Selects CW or CW-R (CW reverse) modes
alternately.
• Use [AGC] control to set the AGC time constant
when switched ON.
• The [AGC VR] indicator above this key lights white
when the control is ON.
➥ Toggles between RTTY and PSK mode.
➥ T oggles between RTTY or RTTY-R
(RTTY reverse) mode when held down for
1 second in RTTY mode.
➥ Toggles between PSK or PSK-R (PSK
reverse) mode when held down for 1 second in PSK mode.
➥ Turns the AGC function OFF when held down for
1 second.
@5 AF CONTROL [AF]
Varies the audio output level of the speaker or
headphones.
➥ Selects AM or FM modes alternately.
@6	RF GAIN CONTROL [RF] (p. ?3-9)
Adjusts the RF gain level.
 While rotating the RF gain control, you may hear
noise. This comes from the DSP unit and does
not indicate a malfunction.
➥ Selects SSB, AM or FM data mode (USBD, LSB-D, AM-D, FM-D) when pushed in
SSB, AM or FM mode, respectively.
➥ Toggles between D1, D2 or D3 when
held down for 1 second.
@7 FUNCTION KEYS [F-1]–[F-7]
	Push to select the function indicated in the display
above these keys.
@9 TRANSMIT INDICATOR [TX]
Lights red while transmitting.
• Functions vary depending on the operating condition.
• SUB band’s [TX] indicator lights only when in split operation.
1-4
PANEL DESCRIPTION
#0 MULTI-FUNCTION KEYS
	Push to select the functions indicated in the display
to the right of these keys.
➥ Turns the speech compressor ON or
OFF in the SSB mode. (p. ?6-5)
➥ Selects the narrow, middle or wide compression when held down for 1 second.
• Functions vary depending on the operating condition.
➥ S elects the antenna connector from
ANT1, ANT2, ANT3 or ANT4 when
pushed. (p. ?10-2)
➥ D isplays antenna selection memory
when held down for 1 second.
✔ What is the speech compressor?
The speech compressor compresses the transmitter audio
input to increase the average audio output level, to increase
talk power. This function is effective for long-distance communication or when propagation conditions are poor.
• When the receive antenna is activated, the
antenna which is connected to [ANT4] is
used for receive only.
➥ Turns the 1⁄4-speed tuning function ON
or OFF in the SSB data, CW, RTTY and
PSK modes. (p. ?3-6)
 When a transverter is in use, this [ANT]
does not function and “TRV” appears.
• 1⁄4 function sets dial rotation to 1⁄4 of normal
speed for fine tuning.
➥ S elects RF power (P o ) , SWR, ALC,
COMP, Vd or Id metering during transmit. (p. ?3-10)
➥ Turns the multi-function digital meter ON
or OFF when held down for 1 second.
(p. ?3-10)
➥ Toggles between the tone encoder, tone
squelch function and no-tone operation
when pushed in the FM mode. (pp. ?432, 4-33)
➥ Enters the tone set mode when held
down for 1 second in the FM mode. (pp.
?4-32, 4-33)
➥ Selects one of two receive RF preamps
or bypasses them. (p. ?5-10)
➥ Turns the voice squelch control function
ON or OFF; useful for scanning. (p.
?9-3)
• “P.AMP1” activates 10 dB preamp.
• “P.AMP2” activates 16 dB high-gain preamp.
✔ What is the preamp?
#1	SQUELCH CONTROL [SQL] (p. ?3-9)
Adjusts the squelch threshold level. The squelch removes noise output from the speaker (closed condition) when no signal is received.
The preamp amplifies received signals in the front end circuit to improve S/N ratio and sensitivity. Select “P.AMP1” or
“P.AMP2” when receiving weak signals.
• The squelch is particularly effective for FM. It is also
available for other modes.
• 11 to 12 o’clock position is recommended for any setting of the [SQL] control.
➥ Selects 6 dB, 12 dB or 18 dB attenuator
when pushed. (p. ?5-10)
➥ Selects 3 dB, 6 dB, 9 dB, 12 dB, 18 dB,
or 21 dB attenuator when held down for
1 second. (p. ?5-10)
Noise squelch
Squelch
threshold
✔ What is the attenuator?
The attenuator prevents a desired signal from distorting
when very strong signals are near the desired frequency, or
when very strong electric fields, such as from a broadcasting
station, are near your location.
Squelch
is open.
Shallow
➥ Activates and selects fast, middle or slow
AGC time constant when pushed. (p. ?512)
• In FM mode, only “FAST” is available.
➥ Enters the AGC set mode when held
down for 1 second. (p. ?5-12)
 AGC time constant can be set between 0.1 to 8.0
second (depends on mode), or turned ­OFF. When
AGC is “OFF,” the S-meter does not function.
✔ What is the AGC?
The AGC controls receiver gain to produce a constant audio
output level, even when the received signal strength varies
dramatically. Select “FAST” for tuning and then select “MID”
or “SLOW” depending on the receiving condition.
1-5
S-meter
squelch
Deep
1
PANEL DESCRIPTION
■ Front panel (Continued)
$9
%0
$8 $7 $6 $5 $4 $3
#2
#3
#4
#5
#6
#2	NOISE BLANKER KEY [NB] (p. ?5-18)
➥ T urns the noise blanker ON or OFF when
pushed. The noise blanker reduces pulse-type
noise such as that generated by automobile ignition systems. This function cannot be used for
FM, or non-pulse-type noise.
#7
#8 #9
$0 $1
$2
#6	LOCK INDICATOR [LOCK] (p. ?5-19)
Lights when the dial lock function is activated.
#7	FUNCTION DISPLAY (p. ?1-15)
S hows the operating frequency, function key
menus, spectrum scope screen, memory channel
screen, set mode settings, and so on.
• The [NB] indicator above this key lights white while
the function is activated.
#8	MINI SPECTRUM SCOPE KEY [M.SCOPE] (p.
?5-4)
➥ Push to turn ON or OFF the mini spectrum scope
screen.
➥ Enters blank-width set mode when held down for
1 second.
#3	NOISE REDUCTION KEY [NR] (p. ?5-19)
 ush to switch the DSP noise reduction ON or
OFF.
• The mini spectrum scope screen can be displayed
with another screen, such as memory or set mode
screen, simultaneously.
• The [NR] indicator above this key lights white when the
function is activated.
➥ Hold down for 1 second to turn ON the spectrum
scope screen.
#4	NOISE REDUCTION LEVEL CONTROL [NR]
(p. ?5-19)
Adjusts the DSP noise reduction level when the
noise reduction is in use. Set for maximum readability.
#9	VOICE MEMORY RECORD KEY [REC]
➥ Push to store the previous received signal for the
preset time period. (p. ?7-7) INSTANT REPLAY
• The preset time period can be set in the Voice set
screen. (p. ?7-13)
• To use this control, push the appropriate band’s [NR].
➥ Hold down for 1 second to record a QSO (Communication) audio onto a memory device. (p.
?7-2)
#5	NOISE BLANKER CONTROL [NB] (p. ?5-18)
Adjust the noise blanker threshold level.
• To use this control, push appropriate band’s [NB] key.
• Hold down this key for 1 second again to stop recording.
• The recorded memory device can be changed in the
Voice set screen. (p. ?7-13)
1-6
PANEL DESCRIPTION
$0	VOICE MEMORY PLAY BACK KEY [PLAY] (p.
?7-8)
➥P
 ush to playback last 5 seconds of the instant replay memory.
$8	TRANSMIT FREQUENCY CHECK KEY [XFC] (p.
?6-6)
Monitors the transmit frequency (including ∂TX frequency offset) when held down during split frequency
operation.
• The playback time can be changed in the Voice set
screen.
• While holding down this key, the transmit frequency can
be changed with the main dial, keypad, memo pad or
[Y]/[Z] keys.
• When the split lock function is turned ON, pushing [XFC]
cancels the dial lock function. (p. ?6-7)
➥ Hold down for 1 second to playback all of the instant replay memory.
• The record time can be changed in the Voice set
screen.
$9 RECEIVE INDICATOR [RX]
	Lights green while receiving a signal and when the
squelch is open.
$1 EXIT/SET KEY [EXIT/SET]
➥ Push to exit, or return to the previous screen indication during spectrum scope, memory, scan
or set screen display.
➥ Hold down for 1 second to display the Set mode
screen.
%0 SPLIT OPERATION INDICATOR [SPLIT]
Lights during split frequency operation.
$2 MAIN DIAL
Changes the displayed frequency (Main band), selects set mode option, and so on.
$3 MAIN/SUB CHANGE KEY [CHANGE]
Toggles the frequency and selected memory channel between main and sub readouts when pushed.
• Toggles between transmit frequency and receive frequency when the split frequency function is ON. (p.
?6-6)
$4 SUB BAND ACCESS KEY [SUB]
Selects the sub readout.
• The sub readout frequency is clearly displayed. The
main readout functions only during split operation or dualwatch.
$5 MAIN BAND ACCESS KEY [MAIN]
Selects the main readout.
• The main readout frequency is clearly displayed. The
sub readout functions only during split operation or dualwatch.
$6 MAIN/SUB EQUALIZING KEY [M=S]
Hold down for 1 second to equalize the sub readout
frequency to the main readout frequency.
$7	MEMORY CHANNEL UP/DOWN KEYS [p]/[q]
(p. ?8-2)
Push to select the desired memory channel.
• Memory channels can be selected both in VFO and
memory modes.
1-7
1
PANEL DESCRIPTION
■ Front panel (Continued)
^4
^3
^2
^1
^0
%9
%8
%7
%6
%5
%4
%3
%1
%1	AUTOMATIC TUNING KEY [AUTO TUNE]
	Turns the automatic tuning function ON or OFF in
CW and AM modes.
%2
%5 DUALWATCH KEY [DUALWATCH] (p. ?5-17)
➥ Turns the dualwatch function ON or OFF when
pushed.
➥ Turns the dualwatch function ON, and equalizes
the main/sub readout frequency to the sub/main
readout when held down for 1 second. (Quick du-
IMPORTANT!
When receiving a weak signal, or receiving a signal
with interference, the automatic tuning function may
tune the receiver to an undesired signal.
alwatch function)
• The quick dualwatch function can be turned OFF in
the Others set screen. (p. ?12-15)
%2 SUB DIAL
Changes the displayed frequency in sub band.
%6 NOTCH KEY [NOTCH] (p. ?5-20)
➥ Selects the notch function between auto, manual
or OFF in SSB and AM modes.
➥ Turns the manual notch function ON or OFF
when pushed in CW, RTTY and PSK31 mode.
➥ Turns the auto notch function ON or OFF when
pushed in FM mode.
%3	SPEECH KEY [SPEECH] (p. ?13-3)
➥ Push to announce the S-meter indication and the
selected readout frequency.
• You can change the speech language, speech speed,  
and speech contents in the Others set screen. (p.
?12-15)
• “ MN ” appears when manual notch is in use.
• “ AN ” appears when auto notch is in use.
➥ Hold down for 1 second to additionally announce
the selected operating mode.
➥ Selects the manual notch characteristics from
wide, middle or narrow when held down for 1
second.
%4 SPLIT KEY [SPLIT] (p. ?6-6)
➥ Push to turn ON or OFF the split function.
➥ Hold down for 1 second to turn the split function
ON and equalizes the sub readout frequency to
the main readout in non-FM modes, and then
sets the sub readout for frequency input mode.
✔ What is the notch function?
The notch function eliminates unwanted CW or AM carrier
tones while preserving the desired voice signal. The DSP
circuit automatically adjusts the filtering frequency to effectively eliminate unwanted tones.
(Quick split function)
• In the FM mode, the sub readout frequency is shifted
the preset frequency offset from the main readout
frequency. (pp. ?12-15, 12-16)
• The quick split function can be turned OFF in the
Others set screen. (p. ?12-15)
➥ After entering a frequency offset, push to turn the
split function ON, and the sub readout frequency
is shifted the amount of frequency from the main
readout frequency.
1-8
PANEL DESCRIPTION
%7	AUDIO PEAK FILTER/TWIN PEAK FILTER KEY
[APF/TPF]
During CW mode operation (p. ?4-6)
➥ Push to turn the audio peak filter ON or OFF.
^1 KEYPAD
➥ Pushing a key selects the operating band.
• [GENE•.] selects the general coverage band.
➥ Pushing the same key 2 or 3 times calls up other
stacked frequencies in the band. (p. ?3-4)
• “ APF ” appears when audio peak filter is in use.
• Icom’s triple band stacking register memorizes 3 frequencies in each band.
➥ Hold down for 1 second to select the APF passband width from WIDE, MID and NAR or from
320, 160 and 80 Hz depending on APF type setting.
During RTTY mode operation (p. ?4-14)
➥ Push to turn the twin peak filter ON or OFF.
➥ After pushing [F-INP•ent], enters a frequency or
memory channel. Pushing [F-INP•ent] or [Y/[Z]
is necessary to end. (pp. ?3-5, 8-2)
• e.g. to enter 14.195 MHz, push [F-INP] [1.8•1] [10•4]
[GENE •] [1.8•1] [28•9] [14•5] [F-INP•ent].
• “ TPF ” appears when twin peak filter is in use.
^2 VFO/MEMORY KEY [V/M]
➥ Toggles the selected readout operating mode
between the VFO and memory when pushed.
(pp. ?3-3, 8-2)
➥ Transfers the memory contents to VFO when
held down for 1 second. (p. ?5-5)
%8	PBT CLEAR KEY [PBT CLEAR] (p. ?5-13)
Clears the PBT settings when held down for 1 second.
• The [PBT CLEAR] indicator above this key lights when
PBT is in use.
%9 FILTER KEY [FILTER] (p. ?5-14)
➥ Selects one of 3 IF filter settings.
➥ Enters the filter set screen when held down for 1
second.
^3 MEMO PAD-WRITE KEY [MP-W] (p. ?8-7)
Programs the selected readout frequency and operating mode into a memo pad.
• The 5 most recent entries remain in memo pads.
• The memo pad quantity can be expanded from 5 to 10
in the Others set screen. (p. ?12-18)
^0 MEMORY WRITE KEY [MW] (p. ?8-4)
Stores the selected readout frequency and operating mode into the displayed memory channel when
held down for 1 second.
^4 MEMO PAD-READ KEY [MP-R] (p. ?8-7)
Each push calls up a frequency and operating
mode in a memo pad. The 5 (or 10) most recently
programmed frequencies and operating modes can
be recalled, starting from the most recent.
• This function is available both in VFO and memory
modes.
• The memo pad quantity can be expanded from 5 to 10
in Others set screen. (p. ?12-18)
1-9
1
PANEL DESCRIPTION
■ Front panel (Continued)
&5
&4
&3
&2
&1
&0
^9
^8
^7
^6
^5
^5 LOCK KEY [LOCK] (p. ?5-19)
Push to switch the dial lock function ON or OFF.
^9 RIT KEY [RIT] (p. ?5-11)
➥ T urns the RIT function ON or OFF when
pushed.
^6 QUICK TUNING KEY [TS]
➥T
 urns the quick tuning step ON or OFF. (p. ?3-6)
• Use [RIT/∂TX] control to vary the RIT frequency.
➥ Adds the RIT shift frequency to the operating frequency when held down for 1 second.
• While the quick tuning indicator, “Z,” is displayed
above the frequency indication, the frequency can
be changed in programmed kHz steps.
• 0.1, 1, 5, 9, 10, 12.5, 20 and 25 kHz steps are available for each operating mode independently.
✔ What is the RIT function?
Receiver incremental tuning (RIT) shifts the receive frequency without shifting the transmit frequency.
➥ When the quick tuning step is OFF, held down
for 1 second to turn the 1 Hz tuning step ON or
OFF. (p. ?3-7)
➥W
 hen the quick tuning step is ON, hold down
for 1 second to enter the Quick tuning step set
screen. (p. ?3-6)
This is useful for fine tuning stations calling you on off-frequency or when you prefer to listen to slightly differentsounding voice characteristics, etc.
&0	CW PITCH CONTROL [CW PITCH] (p. ?4-5)
Shifts the received CW audio pitch and the CW
side tone pitch without changing the operating frequency.
^7 CLEAR KEY [CLEAR] (pp. ?5-11, 6-4)
Clears the RIT/∂TX shift frequency when held down
for 1 second or when pushed momentarily, depending on the quick RIT/∂TX clear function setting (p.
?12-18).
&1	MANUAL NOTCH FILTER CONTROL [NOTCH]
(p. ?5-20)
Varies the “valley” frequency of the manual notch
filter to reject an interfering signal while the manual
notch function is ON.
^8 ∂TX KEY [∂TX] (p. ?6-4)
➥T
 urns the ∂TX function ON or OFF when
pushed.
• Notch filter center frequency:
SSB : –1060 Hz to 4040 Hz
CW : CW pitch freq. + 2540 Hz to CW pitch freq.
–2540 Hz
AM : –5100 Hz to 5100 Hz
• Use [RIT/∂TX] control to vary the ∂TX frequency.
➥ Adds the ∂TX shift frequency to the operating
frequency when held down for 1 second.
✔ What is the ∂TX function?
∂TX shifts the transmit frequency without shifting the receive
frequency. This is useful for simple split frequency operation
in CW, etc.
1-10
PANEL DESCRIPTION
&2	DIGITAL RF SELECTOR CONTROL [DIGI-SEL]
(for SUB band; p. ?5-20)
Adjusts the digital RF selector center frequency.
&5 RIT/∂TX CONTROL [RIT/∂TX] (pp. ?5-11, 6-4)
Shifts the receive and/or transmit frequency without
changing the transmit and/or receive frequency.
• The control can be reassigned as the audio peak filter
adjustment (p. ?12-19)
• Rotate the control clockwise to increase the frequency,
or rotate the control counterclockwise to decrease the
frequency. The RIT or ∂TX functions must be ON.
• The shift frequency range is ±9.999 kHz in 1 Hz steps
(or ±9.99 kHz in 10 Hz steps).
Higher
frequency
Frequency
increases
Lower
frequency
Frequency
decreases
&3	DIGITAL RF SELECTOR KEY [DIGI-SEL]
(p. ?5-20)
Turns the digital RF preselector ON or OFF.
• The [DIGI-SEL] indicator lights white when the preselector is in use.
&4	PASSBAND TUNING CONTROLS [TWIN PBT]
(p. ?5-13)
Adjusts the receiver’s IF filter “passband width” via
the DSP.
• Passband width and shift frequency are displayed in the
multi-function display.
• Hold down [PBT CLEAR] for 1 second to clear the PBT
settings.
• The adjustment range is half of the passband width,
and the value is adjustable in 25 Hz steps for the SSB/
CW/RTTY/PSK modes, and 100 Hz steps for the AM
mode.
PBT2
PBT1
–
High cut
Center
Low cut
✔ What is the PBT control?
The PBT function electronically modifies the IF passband
width to reject interference. This transceiver uses the DSP
circuit for the PBT function.
1-11
1
PANEL DESCRIPTION
■ Rear panel
y u
!0
@8
@7
@6
@5
@4
@3
@2 @1 @0 !9 !8 !7 !6
q ANTENNA CONNECTOR [ANT 1–4] (p. ?2-4)
	Accept a 50 Ω antenna with a PL-259 plug connector.
!5
!4
!3 !2 !1
About the [USB A] connector:
• Supported only USB flash drive, keyboard, mouse
or hub.
• KEEP the transceiver power OFF when connecting
or disconnecting a USB keyboard, mouse or hub.
• DO NOT connect the following devices:
- Two or more the same kind of USB devices.
(Example: Two USB hubs or two USB mouses)
- Multimedia adapter
- USB HDD
- Larger than 32 GB USB flash drives
- Bluetooth® keyboard or mouse.
w GROUND TERMINAL [GND] (p. ?2-3)
	Connect this terminal to a ground to prevent electrical shocks, TVI, BCI and other problems.
e CIRCUIT BREAKER
Cuts off the AC input when over-current occurs.
r	EXTERNAL DISPLAY TERMINAL
[EXT-DISPLAY] (p. ?2-6)
Connects to an external display monitor.
• At least 800×600 pixel display is necessary.
y	S/P DIF INPUT TERMINAL [S/P DIF– IN] (p. ?2-6)
u	S/P DIF OUTPUT TERMINAL [S/P DIF– OUT]
(p. ?2-6)
Connects external equipment that supports S/P DIF
input/output.
t USB (Universal Serial Bus) PORT [USB A]
➥ Insert USB flash drive* for both reading and storing a wide variety of the transceiver’s information
and data.
• The indicator above the connectors lights or blinks
when the transceiver reads or writes to the memory data.
• An unmount operation should be performed before removing the USB flash drive* (p.12-29).
i ETHERNET CONNECTOR [LAN] (p. ?16-6)
Connects to a PC network through a LAN (Local
Area Network).
➥ Connects a PC keyboard for RTTY and PSK31
operations.
o MAIN POWER KEY [I/O] (p. ?3-2)
Turns the internal power supply ON or OFF.
• USB keyboards* are supported.
*: A USB flash drive or USB keyboard is not supplied by Icom.
!0 AC POWER SOCKET [AC] (p. ?2-4)
Connects the supplied AC power cable to an AC
line-voltage receptacle.
!1	EXTERNAL SPEAKER JACK MAIN [EXT-SP A]
(p. ?2-5)
!2	EXTERNAL SPEAKER JACK SUB [EXT-SP B]
(p. ?2-5)
Connects an external speaker (4–8 Ω), if desired.
1-12
PANEL DESCRIPTION
@1 METER JACK [METER] (p. ?2-6)
	Outputs the receiving signal strength level signal,
transmit output power, VSWR, ALC, speech compression, Vd or Id level for external meter indication.
!3 USB PORT [USB B]
USB B type port onnects a PC.
• A USB A/USB B cable is required.
!4 ACCESSORY SOCKET [A ACC1]
ACCESSORY SOCKET [A ACC2]
ACCESSORY SOCKET [B ACC1]
ACCESSORY SOCKET [B ACC2]
Enable connection of external equipment such as
a linear amplifier, an automatic antenna selector/
tuner, a TNC for data communications, etc.
@2	CI-V REMOTE CONTROL JACK [REMOTE]
(p. ?2-5)
➥ Connects a PC via the optional CT-17 ci-v level
converter for external control of the transceiver.
➥ Used for transceive operation with another Icom
CI-V transceiver or receiver.
• See page 1-14 for socket information.
!5 DC OUTPUT JACK [DC OUT] (p. ?2-6)
	Outputs a regulated 14 V DC (approximately) for external equipment. Connected in parallel with 13.8 V
outputs of [ACC 1] and [ACC 2]. (max. 1 A in total)
@3 RECEIVE ANTENNA B OUT [RX ANT B– OUT]
@4 RECEIVE ANTENNA B IN [RX ANT B– IN]
Located between the transmit/receive switching circuit and receiver’s RF stage in SUB band (MAIN
band during split operation).
Connects an external unit, such as preamplifier or
RF filter, using BNC connectors, if desired.
!6 T/R CONTROL JACK* [RELAY] (p. ?2-7)
Goes to ground when transmitting to control an external unit, such as a non-Icom linear amplifier.
When no external unit is connected, [RX ANT B–
OUT] and [RX ANT B– IN] must be shorted with the
supplied coaxial cable. (p. ?2-2)
NOTE: T/R control voltage and current must be
lower than 16 V DC/0.5 A (or 250 V AC,
200 mA with MOS-FET switching).
[RX ANT A/B]
Receiver
IN
!7 ALC INPUT JACK [ALC] (p. ?2-7)
Connects to the ALC output jack of a non-Icom linear amplifier.
Transmitter
!8	ALC LEVEL ADJUSTMENT POT* [ALC ADJ]
Adjusts the ALC levels.
No adjustment is required when the ALC output
level of the connected non-Icom linear amplifier is 0
to –4 V DC.
OUT
Transmit/Receive
switching circuit
@5	TRANSVERTER CONNECTOR [X-VERTER]
(p. ?2-5)
External transverter input/output connector.
Activated by voltage applied to [ACC 2] pin 6, or
when the transverter function is in use. (pp. ?1-14,
4-6)
!9 STRAIGHT KEY JACK [KEY] (p. ?2-4)
Accepts a straight key or external electronic keyer
with 1⁄4 inch standard plug.
@6 RECEIVE ANTENNA A OUT [RX ANT A– OUT]
@7 RECEIVE ANTENNA A IN [RX ANT A– IN]
Located between the transmit/receive switching circuit and receiver’s RF stage in MAIN band (SUB
band during split operation).
• [ ELEC-KEY] on the front panel can be used for a
straight key or external electronic keyer. Deactivate the
internal electronic keyer in the Keyer set screen. (p. ?412)
(+)
Connects an external unit, such as preamplifier or
RF filter, using BNC connectors, if desired.
(_)
When no external unit is connected, [RX ANT A–
OUT] and [RX ANT A– IN] must be shorted with the
supplied coaxial cable. (p. ?2-2)
@0	EXTERNAL KEYPAD JACK [EXT KEYPAD]
(p. ?2-6)
Connects an external keypad for direct voice memory (p. ?7-11), memory keyer (p. ?4-8), RTTY memory (p. ?4-16) or PSK memory (p. ?4-24) transmission.
Transceiver mute control line (both transmit and receive) is also supported.
@8	REFERENCE SIGNAL INPUT/OUTPUT
TERMINAL [REF I/O]
Inputs/outputs a 10 MHz reference signal.
1-13
1
PANEL DESCRIPTION
■ Accessory connector information
ACC 1
PIN No.
NAME
RTTY
Controls RTTY keying
GND
Connects to ground.
Connected in parallel with ACC 2 pin 2.
An external equipment
Input/output controls the transceiver.
When this pin goes low,
pin.
Connected in the transceiver transmits.
parallel with The transceiver outputs
ACC 2 pin 3. a low signal to control external equipment.
Modulator input.
Connects to a modulator.
8 3
SEND*
DESCRIPTION
SPECIFICATIONS
“High level”
“High level”
Output current
: More than 2.4 V
: Less than 0.6 V
: Less than 2 mA
———
Input voltage (High) : 2.0 V to 20.0 V
Input voltage (Low) : –0.5 V to 0.8 V
: Maximum 20 mA
Current flow
Output voltage (Low) : Less than 0.1 V
: Maximum 200 mA
Current flow
Input impedance
Output level
: 10 kΩ
: Approximately 100 mV rms
MOD
AF
SQLS
Squelch output.
Grounded when squelch opens.
SQL open
SQL closed
: Less than 0.3 V/5 mA
: More than 6.0 V/100 µA
13.8 V
13.8 V output when power is ON.
Connected in parallel with ACC 2 pin 7.
Output current
: Max. 1 A
ALC
ALC voltage input.
Connected in parallel with ACC 2 pin 5.
Control voltage
Input impedance
: –4 V to 0 V
: More than 10 kΩ
AF detector output.
Output impedance : 4.7 kΩ
Fixed level, regardless of [AF] position
Output level
: 100–300 mV rms
in default settings. (see notes below)
NOTE: If the CW side tone level limit or beep level limit is in use, the CW side tone or beep tone decreases
from the fixed level when the [AF] control is rotated above a specified level. (pp. 12-5, 12-6)
ACC 2
PIN No.
NAME
DESCRIPTION
8V
Regulated 8 V output.
GND
Same as ACC 1 pin 2.
SEND*
Same as ACC 1 pin 3.
BAND
Band voltage output.
(Varies with amateur band)
ALC
Same as ACC 1 pin 8.
TRV
Activates [X-VERTER] input/output
when “HIGH” voltage is applied
13.8 V
SPECIFICATIONS
Output voltage
Output current
: 8 V ±0.3 V
: Less than 10 mA
Output voltage
: 0 V to 8.0 V
Input impedance
Input voltage
: More than 10 kΩ
: 2 V to 13.8 V
Same as ACC 1 pin 7.
* When the SEND terminal controls the inductive load (such as a relay), a counter-electromotive force can cause
the transceiver’s malfunction or damage. To prevent this, we recommend adding a switching diode, such as an
“1SS133,” on the load side of the circuit to the counter-electromotive force absorption.
When the diode is added, a switching delay of the relay may occur. Be sure to check its switching action before
operation.
[Example]
ACC 1/2
sockets
Switching diode
To a non-Icom
linear amplifier
e SEND
Relay
u 13.8 V
1-14
PANEL DESCRIPTION
■ LCD display
rt y
tr
!3
!2
!0
!1
q BAND WIDTH INDICATOR (p. 5-13)
Shows the passband width of the IF filter.
!0 IF FILTER INDICATOR
Shows the selected IF filter number.
w MODE INDICATOR
Shows the selected mode.
!1	VFO/MEMORY CHANNEL INDICATOR (p. 3-3)
Indicates the VFO mode or selected memory channel number.
e SHIFT FREQUENCY INDICATOR (p. 5-13)
Shows the shift frequency of the IF filter.
!2	TX INDICATOR
➥ “ TX ” appears while transmitting.
➥ Indicates the frequency readout for transmit.
r PASSBAND WIDTH INDICATOR (p. 5-13)
Graphically displays the passband width for twin
PBT operation and center frequency for IF shift operation.
• Appears on the sub readout when the split function
is turned ON.
• A TX indicator with doted rectangle, “ TX ” is displayed, instead of the regular “ TX ” TX indicator,
when a frequency outside of an amateur band
frequency range is selected. This function can be
turned OFF in set mode, if desired. (pp. 3-13, 12-12)
t QUICK TUNING INDICATOR (p. 3-6)
Appears when the quick tuning step function is in
use.
y BANDPASS FILTER INDICATOR
Appears when the narrow filter (500 Hz or less) is
selected in the CW, RTTY, or PSK mode.
!3 S/RF METER (p. 3-10)
	Shows the signal strength while receiving. Shows
the relative output power, SWR, ALC or compression levels while transmitting.
u RTTY TUNING INDICATOR
Shows the tuning level in RTTY mode.
i CLOCK READOUT
Shows the current time.
o FREQUENCY READOUTS
Shows the operating frequency.
• Gray characters are used for non-active readout.
1-15
1
PANEL DESCRIPTION
■ LCD display (Continued)
!4
!9
!5
!8
!7
!8
!6
!4 LAN INDICATOR
	Appears when the Remote station access the transceiver through the LAN. (An optional RS-BA1 is required.)
!5 MULTI-FUNCTION SCREEN
	Shows the screens for the multi-function digital meter, spectrum scope, audio scope, voice recorder, memory channel, scan, memory keyer,
RTTY decoder, PSK decoder, IF filter selection or
set modes, and so on.
!6 DISPLAY FUNCTION KEY GUIDE
Indicates the function of the Display Function keys
([F-1] – [F-7]).
!7 MEMORY CHANNEL READOUTS
➥S
 hows the selected memory channel contents in
VFO mode.
➥ Shows the VFO contents in memory mode.
!8	S ELECT MEMORY CHANNEL INDICATOR (p.
?9-7)
Indicates the displayed memory channel is set as a
select memory channel.
The desired memory channels can be assigned to
3 select groups, for fast, convenient scanning.
!9 MULTI-FUNCTION KEY GUIDE
Indicates the function of the multi-function keys.
1-16
!7
PANEL DESCRIPTION
■ Screen menu arrangement
Pushing [EXIT/SET] several times returns to the start
up screen. See page 12-3 for set mode arrangement.
The following screens can be selected from the start
up screen. Choose the desired screen using the following chart.
• Start up screen
• PSK decoder screen
(☞P?5-24)
F-3
• Memory channel screen
F-1
F-2
F-3
F-4
F-5
F-6
(☞P?11-3)
F-7
F-4
• Spectrum scope screen
(VFO mode: ☞P?12-4)
• Scan screen
(☞P?6-2)
F-5
• Voice recorder screen
• Scan screen
(☞P?9-3)
F-2
• Memory keyer screen
F-5
(CW mode: ☞P?5-8)
• Audio scope screen
F-3
• RTTY decoder screen
(Memory mode: ☞P?12-5)
(☞P?6-15)
F-5
• Set mode menu screen
(☞P?5-15)
F-7
F-3
1-17
(☞P?15-3)
BASIC OPERATIONS
■
■
■
■
■
■
■
■
■
■
■
■
Section
When first applying power (CPU resetting)… ………………………… 4-2
Main/Sub band selection… ……………………………………………… 4-3
Selecting VFO/memory mode…………………………………………… 4-3
Selecting an operating band…………………………………………… 4-4
D Using the band stacking registers… ………………………………… 4-4
Frequency setting… ……………………………………………………… 4-5
D Tuning with [MAIN DIAL]… …………………………………………… 4-5
D Direct frequency entry with the keypad……………………………… 4-5
D Quick tuning step… …………………………………………………… 4-6
D Selecting “kHz” step… ………………………………………………… 4-6
D 1⁄4 tuning step function………………………………………………… 4-6
D Selecting 1 Hz step… ………………………………………………… 4-7
D Auto tuning step function… …………………………………………… 4-7
Operating mode selection………………………………………………… 4-8
Volume setting… ………………………………………………………… 4-9
RF gain adjustment… …………………………………………………… 4-9
Squelch level adjustment………………………………………………… 4-9
Meter indication selection………………………………………………… 4-10
D Multi-function digital meter… ………………………………………… 4-10
D Meter type selection… ………………………………………………… 4-11
Basic transmit operation… ……………………………………………… 4-12
D Transmitting… ………………………………………………………… 4-12
D Microphone gain adjustment… ……………………………………… 4-12
D Drive gain adjustment… ……………………………………………… 4-13
Band edge warning beep………………………………………………… 4-14
D Programming the user band edge… ………………………………… 4-15
4-1
4
BASIC OPERATIONS
■■When first applying power (CPU resetting)
[I/O]
Before first applying power, make sure all connections
required for your system are complete by referring to
Section 3. Then, reset the transceiver using the following procedure.
Resetting CLEARS all programmed contents in
memory channels and returns programmed values
in set mode to default values.
q	Turn ON the main power with [I/O] on the rear panel.
[POWER] indicator
• The transceiver power is still OFF and the [POWER]
indicator lights orange.
w	While holding down [F-INP] and [MW], push [POWER] to turn power ON.
• The CPU is reset.
• The CPU start-up takes approximately 5 seconds.
• The transceiver displays its initial VFO frequencies when
resetting is complete.
e	Change the set mode settings after resetting, if desired.
[POWER]
[POWER] indicator
In cooler temperatures, the LCD may appear dark
and unstable after turning power ON. This is normal
and does not indicate any equipment malfunction.
[POWER]
[F-INP]
[MW]
■■Initial settings
After resetting the transceiver, set controls as shown
in the figure below.
[RF PWR]
: Max. clockwise
[DELAY]
: Max. clockwise
[MIC]
: 10–12 o’clock
[KEY SPEED]
: 10–12 o’clock
[NR]
: Max. counter clockwise
[NB]
: Max. counter clockwise
[NOTCH]
: 12 o’clock
[AGC]: 12 o’clock
[SQL]
: Max. counterclockwise
[DEGI-SEL]
: 12 o’clock
[CW PITCH]
: 12 o’clock
[AF]
: Max. counterclockwise
[RF]
: Max. clockwise
[MONI GAIN], [COMP], [DRIVE],
[VOX GAIN], [ANTI VOX]
: 12 o’clock
4-2
BASIC OPERATIONS
■■Main/Sub band selection
The IC-7850 has 2 identical receivers, main and sub.
The main band is displayed on the left hand side, and
the sub band is displayed on the right hand side of the
LCD. Some functions can only be applied to the selected band and transmission occurs on the main band
(except during split frequency operation).
[MAIN]
➥ Push [MAIN] to select the main band.
• The key backlight for [MAIN] lights.
• Main band’s frequency readout highlighted.
➥ Push [SUB] to select the sub band.
• The key backlight for [SUB] lights.
• Sub band’s frequency readout highlighted.
■■Selecting VFO/memory mode
[V/M]
 FO is an abbreviation of Variable Frequency OscilV
lator, and is commonly referred to as a main tuning
function.
[MAIN DIAL] is often called the “VFO knob.”
➥	Push [V/M] to switch between VFO and memory
modes.
• “VFO” appears when in VFO mode, or the selected
memory channel number appears when in memory
mode.
• Holding down [V/M] for 1 second transfers the contents
of the selected memory channel to VFO. (p. 8-5?)
4-3
[SUB]
4
BASIC OPERATIONS
■■Selecting an operating band
The triple band stacking register provides three memories for each band key to store frequencies and operating modes.
This function is convenient when you operate three operating modes on one frequency band.
For example, one register can be used for a CW frequency, another for an SSB frequency and the other
one for an RTTY frequency.
Band keys
If a band key is pushed once, the last used frequency
and operating mode are called up. When the key is
pushed again, another stored frequency and operating
mode are called up.
See the table below for a list of the available frequency
bands and their default frequency and mode settings.
BAND
REGISTER 1
REGISTER 2
REGISTER 3
1.8 MHz
3.5 MHz
7 MHz
10 MHz
14 MHz
18 MHz
21 MHz
24 MHz
28 MHz
50 MHz
General
1.900000 MHz CW
3.550000 MHz LSB
7.050000 MHz LSB
10.120000 MHz CW
14.100000 MHz USB
18.100000 MHz USB
21.200000 MHz USB
24.950000 MHz USB
28.500000 MHz USB
50.100000 MHz USB
15.000000 MHz USB
1.910000 MHz CW
3.560000 MHz LSB
7.060000 MHz LSB
10.130000 MHz CW
14.200000 MHz USB
18.130000 MHz USB
21.300000 MHz USB
24.980000 MHz USB
29.500000 MHz USB
50.200000 MHz USB
15.100000 MHz USB
1.915000 MHz CW
3.580000 MHz LSB
7.020000 MHz CW
10.140000 MHz CW
14.050000 MHz CW
18.150000 MHz USB
21.050000 MHz CW
24.900000 MHz CW
28.100000 MHz CW
51.000000 MHz FM
15.200000 MHz USB
DDUsing the band stacking registers
q	Push band key’s [21], then select a frequency and
an operating mode.
• The previously selected frequency and an operating
mode are memorized in the first band stacking register
of that band.
w	Push band key’s [21] again, then select another frequency and operating mode.
• The frequency and operating mode that is selected in
step q are memorized in the 21 MHz’s first band stacking register.
e	Push band key’s [21] again, then select another frequency and operating mode.
• The frequency and operating mode that is selected in
step w are memorized in the 21 MHz’s second band
stacking register.
r	Push band key’s [21] again, then select another frequency and operating mode.
• The frequency and operating mode that is selected in
step e are memorized in the 21 MHz’s third band stacking register.
• When band key’s [21] is pushed again, the first band
stacking register set in step w, is overwritten.
4-4
BASIC OPERATIONS
■■Frequency setting
 he transceiver has several tuning methods for conveT
nient frequency tuning.
Band keys
DDTuning with [MAIN DIAL]
q	Push the desired band key on the keypad 1–3
times.
• Three different frequencies can be selected on each
band with the band key.
• Push [MAIN] or [SUB] to select the band.
w Rotate [MAIN DIAL] to set the desired frequency in
the main band, rotate the sub dial to set the desired
frequency in the sub band.
[MAIN DIAL]
[SUB DIAL]
 If the dial lock function is activated, the lock indicator lights, and [MAIN DIAL] does not function. In this
case, push [LOCK] to deactivate the lock function.
(see p. 4-11 for details)
✔ CONVENIENT!
The sub dial is always available for tuning the sub
band. The sub dial allows quick tuning in the sub band
without switching from main to sub.
Keypad
DDDirect frequency entry with the keypad
The transceiver has a keypad for direct frequency entry as described below.
 Push [MAIN] or [SUB] to select the band.
w Push [F-INP].
• “ F-INP ” indicator appears and keypad backlight lights.
e Input the desired frequency
• Push [•] to input “. (decimal point)” between the MHz
units and kHz units.
F-INP
ENT
Push
r Push [ENT] to set the input frequency.
• To cancel the input, push any other key (except [Y]/[Z])
instead of [ENT].
Key entry
[EXAMPLE]
7.00000 MHz
Push
21.24000 MHz
Push
21.24000 MHz  21.36000 MHz
Push
4-5
4
BASIC OPERATIONS
■■ Frequency setting (Continued)
DDQuick tuning step
[MAIN DIAL]
The operating frequency can be changed in kHz steps
(0.1, 1, 5, 9, 10, 12.5, 20 or 25 kHz selectable) for
quick tuning.
[SUB DIAL]
q Push [TS] to turn ON the quick tuning function.
• “Z” is displayed when the function is ON.
w Rotate [MAIN DIAL] ain dial to change the frequency in programmed kHz steps.
e Push [TS] again to turn OFF the indicator.
r Rotate [MAIN DIAL] for normal tuning if desired.
Mode keys
TS icon
[EXIT/SET]
[TS]  MAIN, SUB
TS icon
DDSelecting “kHz” step
q Push [TS] to turn the quick tuning function ON or
OFF.
• “Z” appears when the quick tuning function ON.
• “TS” screen
w Hold down [TS] for 1 second to enter tuning step
setting display.
• Selected tuning steps for all modes appear.
e Select the desired operating mode.
r Rotate [MAIN DIAL] to select the desired tuning
step.
t	Repeat steps e and r to select quick tuning steps
for other modes, if desired.
y Push [EXIT/SET] to exit the setting display.
 OTE: When entering quick tuning step set mode,
the quick tuning function must be activated first. The
main and sub bands have independent tuning step
settings.
DD1⁄4 tuning step function
When operating in SSB data, CW, RTTY or PSK, the
1⁄4 tuning function is selectable. Dial speed is reduced
to 1⁄4 of normal speed when the 1⁄4 tuning function is
ON for finer tuning control.
1/4 tuning step OFF
➥ Push the Multi-function keys’ [1/4] to toggle the 1⁄4
tuning function ON or OFF.
•“
” appears when the 1⁄4 tuning function is ON.
4-6
1/4 tuning step ON
BASIC OPERATIONS
■■ Frequency setting (Continued)
DDSelecting 1 Hz step
The minimum tuning step of 1 Hz can be used for fine
tuning.
 In the Quick tuning function OFF.
• “q” is not displayed.
qqHold
down [TS] for 1 second.
• Turn the 1 Hz tuning step ON or OFF.
 OTE: 1 Hz tuning step activates for both main and
sub bands simultaneously. Therefore, either [TS]
can be used for the 1 Hz tuning step selection.
1Hz digit
1Hz digit
DDAuto tuning step function
When rotating main or sub dial rapidly, the tuning
speed accelerated automatically as selected.
qqSelect the “MAIN DIAL Auto TS” item in the Others
set screen.
SET [F-7]  OTHERS [F-5]  MAIN DIAL Auto TS
• “MAIN DIAL Auto TS” for main dial, “SUB DIAL Auto TS”
for sub dial selection.
wwRotate [MAIN DIAL] to select the option.
Auto tuning step options
HIGH: Approximately 5 times faster when the
tuning step is set to 1 kHz or smaller steps;
approximately 2 times faster when the
tuning step is set to 5 kHz or larger steps.
LOW: Approximately 2 times faster.
OFF: Auto tuning step is turned OFF.
eePush [EXIT/SET] several times.
(F) Function keys
• Exits the set mode.
4-7
[EXIT/SET]
[MAIN DIAL]
4
BASIC OPERATIONS
■■Operating mode selection
SSB (USB/LSB), SSB data (USB data/LSB data), CW,
CW reverse (CW-R), RTTY, RTTY reverse (RTTY-R),
PSK, PSK reverse (PSK-R), AM, AM data, FM and FM
data modes are selectable in the IC-7850. Select the
desired operation mode as follows.
To select a mode of operation, push the desired Mode
key. Push the key again to toggle between USB and
LSB, CW and CW-R, RTTY/RTTY-R and PSK/PSK-R,
AM and FM, if desired. Hold down the key for 1 second
to toggle between RTTY and RTTY-R, PSK and PSKR, if desired.
See the diagram to the right for the order of selection.
Mode keys
USB
Microphone signals are muted when data mode is selected.
LSB
CW-R
CW
• Selecting SSB mode
➥ Push [SSB] to select USB or LSB.
RTTY-R
• USB is selected first when above 10 MHz; or LSB is
selected first when below 10 MHz operation.
(USB is selected when 5 MHz band is selected for the
USA version.)
• After USB or LSB is selected, push [SSB] to toggle between USB and LSB.
RTTY
PSK
AM
FM
USB
LSB
AM
FM
• Selecting CW mode
➥ Push [CW] to select CW.
• After CW is selected, push [CW] to toggle between CW
and CW reverse mode.
PSK-R
USB-D1
LSB-D1
AM-D1
FM-D1
USB-D2
LSB-D2
AM-D2
FM-D2
USB-D3
LSB-D3
AM-D3
FM-D3
• Selecting RTTY/PSK mode
➥ Push [RTTY/PSK] to select RTTY or PSK.
• After RTTY or PSK is selected, push [RTTY/PSK] to
toggle between RTTY and PSK.
• After RTTY or PSK is selected, hold down [RTTY/PSK]
for 1 second to toggle between RTTY and RTTY reverse, or, PSK and PSK reverse mode, respectively.
Hold down mode
switch for 1 second.
• Selecting AM/FM mode
➥ Push [AM/FM] to select AM or FM.
• After AM or FM is selected, push [AM/FM] to toggle between AM and FM.
• Selecting DATA mode
➥ After USB, LSB, AM or FM is selected, push [DATA]
to select USB data, LSB data, AM data or FM data
mode, respectively.
• After data mode is selected, push [DATA] to toggle between regular voice and data mode.
• After data mode is selected, hold down [DATA] for 1 second to select data 1, 2 and 3 in sequence.
[DATA]
4-8
Push mode switch
momentarily.
BASIC OPERATIONS
■■Volume setting
➥➥Rotate [AF] control adjust the audio output level.
• Set a suitable audio level.
[AF]  MAIN, SUB
■■Squelch level adjustment
[SQL]  MAIN, SUB
 he squelch removes noise output from the speaker
(closed position) when no signal is received.
➥ When no signal is received, rotate [SQL] control fully
counterclockwise first, then rotate [SQL] clockwise
to the point that the noise just disappears.
• In the FM mode
• Other than the FM mode (SSB/CW/RTTY/PSK/AM)
Noise squelch
S-meter squelch
Squelch is
open
Squelch is
open
■■RF gain adjustment
➥ Rotate [RF] control clockwise to increase, counterclockwise to decrease the receiver sensitivity.
[RF]  MAIN, SUB
4-9
S-meter squelch
4
BASIC OPERATIONS
■■Meter selection
The S/RF meter indication, during transmit, can be selected from the following items as you desire.
Signal strength level
readout
Id readout
➥ Push the Multi-function keys’ [METER] several times
to select the desired meter item.
Power level readout
• The selectable meters are:
Po  SWR  ALC  COMP  Vd  Id in order.
SWR readout
Compression level
readout
Indicates the RF output power in watts.
ID
0 10
Po
SWR 0
COMP
+20 +40
10
50
1.5 102
ALC
ALC level readout
100 150
200
+60dB
15
250
20
44 52V VD
Vd readout
() Multi-function keys
Indicates the VSWR on the transmission
line.
Indicates the ALC level. The ALC circuit begins to activate when the RF output power
reaches a preset level.
Indicates the compression level when the
speech compressor is in use.
Indicates the drain current of the final amplifier MOS-FETs.
Indicates the drain terminal voltage of the
final amplifier MOS-FETs.
DDMulti-function digital meter
The IC-7850 can display the multi-function digital meter in the LCD display. This meter displays all transmit
parameters simultaneously.
Pushing [P-HOLD](F) toggles ON and OFF.
➥➥Hold down the Multi-function keys’ [METER] for 1
second.
• The Multi-function digital meter is displayed.
• Hold down the Multi-functions keys’ [METER] for 1 second to turn OFF the multi-function digital meter.
➥➥Push [P-HOLD](F) to turn ON the peak level hold
function.
• “P-HOLD” is displayed on the window title when the
function is ON.
4-10
dB
BASIC OPERATIONS
■■ Meter indication selection (Continued)
DDMeter type selection
A total of 3 meter types are selectable.
The meter types are Standard, Edgewise and Bar meters. Follow the instructions for the meter type selection.
qqSelect the “Meter Type (Normal Screen)” item in the
Display set screen.
SET [F-7]  DISPLAY [F-3]  Meter Type (Normal
screen)
(F) Function keys
[EXIT/SET]
[MAIN DIAL]
wwRotate [MAIN DIAL] to select the option.
eePush [EXIT/SET] several times.
• Exits the set mode.
• Bar meter
• Edgewise meter
■■Dial lock function
 he dial lock function prevents frequency changes by
accidental movement of the tuning dial. The lock function electronically locks the dial.
[LOCK] indicator  MAIN, SUB
[LOCK]  MAIN, SUB
➥➥Push [LOCK].
• Each push toggles the dial lock function ON or OFF.
• The [LOCK] indicator lights when the function is ON.
• [MAIN DIAL] or [SUB DIAL] is locked when the function
is ON.
[MAIN DIAL] [SUB DIAL]
4-11
4
BASIC OPERATIONS
Before transmitting, monitor your selected operating frequency to make sure transmitting won’t cause
interference to other stations on the same frequency. It’s good amateur practice to listen first, and then,
even if nothing is heard, ask “is the frequency in use” once or twice, before you being operating on that
frequency.
■■Basic transmit operation
[TRANSMIT]
DDTransmitting
[RF PWR]
TX indicator (MAIN)
q Push [TRANSMIT] or [PTT] (microphone) to transmit.
• The main band’s [TX] indicator lights red.
• When split operation is activated, the sub band’s [TX]
indicator lights.
w Push [TRANSMIT] again or release [PTT] (microphone) to return to receive.
✔ Adjusting the transmit output power
➥ Rotate [RF PWR].
TX power readout
• Adjustable range : 5 W to 200 W
(AM mode: 5 W to 50 W)
“<5W” is displayed when the power is set less than 5 W.
DDMicrophone gain adjustment
Before transmitting, monitor your selected operating
frequency to make sure transmitting won’t cause interference to other stations on the same frequency.
[TRANSMIT]
[MIC]
TX indicator (MAIN)
q Push [METER] to select the ALC meter.
w Push [PTT] (microphone) to transmit.
• Talk into the microphone at your normal voice level.
e While talking into the microphone, rotate [MIC] so
that the ALC meter reading doesn’t go outside the
ALC zone. (see to the right)
r Release [PTT] (microphone) to return to receive.
ALC zone
4-12
ID
0 10
SWR 0
COMP
Po
+20 +40
10
50
1.5 102
ALC
100 150
200
20
44 52V VD
+60dB
15
250
dB
BASIC OPERATIONS
■■ Basic transmit operation (Continued)
DDDrive gain adjustment
The drive gain is active for all modes except SSB without speech compressor. The [DRIVE] control adjusts
the amplifying gain at the driver stage.
 Push [METER] to select the ALC meter.
w Push [PTT] (microphone; SSB with [COMP] ON,
AM or FM), key down (CW) or push [TRANSMIT]
(RTTY or PSK) to transmit.
e	While talking into the microphone, keying down or
transmitting, rotate [DRIVE] so that the ALC meter
reading swinging within 30 to 50% of the ALC scale.
(see to the right)
[DRIVE]
Drive gain range
• Talk into the microphone at your normal voice level.
r Release [PTT], stop keying or push [TRANSMIT]
again to return to receive.
ID
0 10
SWR 0
COMP
Po
+20 +40
10
50
1.5 102
ALC
100 150
200
+60dB
15
250
20
44 52V VD
dB
DDTransmit power limit
The transceiver can be set maximum output power to
each operating band.
You can separately set the maximum output power for
operating in the DATA mode
Band key
qqSelect the “TX Power Limit” item in the Others set
screen.
SET [F-7]  OTHERS [F-5]  TX Power Limit
wwRotate [MAIN DIAL] to select “ON.”
(F) Function keys
• When ON is selected, the TX Power Limit is active.
[EXIT/SET]
[MAIN DIAL]
eePush [LIMIT](F).
• The TX POWER LIMIT screen is displayed.
[LIMIT] key is displayed
rrPush the band key.
• Select the desired band to be set the TX Power Limit.
• In the Phone mode (SSB, AM, or FM mode), push [DATA]
to select the Data mode.
ttRotate [MAIN DIAL] to set the maximum power.
yyPush [EXIT/SET] several times.
• Exits the set mode.
When ON is selected
TX POWER LIMIT screen
4-13
4
BASIC OPERATIONS
■■Band edge warning beep
When the transverter function is in use, the band
edge warning beep sounds with the default setting.
This function allows you to hear a beep tone when you
tune in or out of an amateur band’s frequency range. A
regular beep sounds when you tune into a range, and
an lower tone error beep will sound when you tune out
of a range.
Also, the TX indicator shows if the selected frequency
is in or out of an amateur band, when an option other
than “OFF” is set.
• A TX indicator with doted oval, “
” is displayed, instead of
the regular “
” TX indicator, when a frequency outside of
an amateur band frequency range is selected.
(F) Function keys
[MAIN DIAL]
() Multi-function keys
[EXIT/SET]
qqSelect the “Beep (Band Edge)” item in the Others
set screen.
SET [F-7]  OTHERS [F-5]  Beep (Band Edge)
wwRotate [MAIN DIAL] to select the option.
Band Edge Beep options
OFF:
Band edge beep is OFF.
ON (Default): When you tune into or out of the
default amateur band’s frequency
range, a beep sounds. (default)
ON (User):
When you tune outside of, or back
into a user programmed amateur
band’s frequency range, a beep
sounds.
ON (User) & TX Limit:
			When you tune outside of, or back into
a user programmed amateur band’s
frequency range, a beep sounds.
Transmission is also inhibited outside
the programmed range.
eePush [EXIT/SET] several times.
ON（Default） is selected
The beep output level can be set in level set mode.
(p. 12-5)
• Exits the set mode.
4-14
BASIC OPERATIONS
■■ Band edge warning beep (Continued)
DDProgramming the user band edge
q	Select the “Beep (Band Edge)” item in the Others
set screen.
SET [F-7]  OTHERS [F-5]  Beep (Band Edge)
[BAND] key is displayed
wwRotate [MAIN DIAL] to select either the “ON (User)”
or “ON (User) & TX Limit” option.
• The [BAND] key is displayed in the Function keys.
e Push [BAND](F) to open the band edge screen.
r	Push [p](F) or [q](F) to select the band edge that
is changed or deleted.
• Hold down to continuously move the lines.
• Push [Ω ≈](F) to toggle between the entry cells of upper
and lower band edge frequencies.
• Push [INS]() to insert a new blank line.
• Hold down [DEL]() for 1 second to delete the selected
line.
• Hold down [DEF](F) for 1 second to initialize all band
edge frequencies.
  The band edge initialize screen appears as shown below, then push [OK](F) to initialize all frequencies.
ON（User） is selected
• Band edge screen
t Enter the Band edge frequencies with the keypad.
q Push [F-INP] to enter the frequency input mode.
w Enter the desired frequency.
e Push [ENT] to save the frequency.
• Push [•] to input decimal point (“.”) between the MHz and
kHz digits.
• Program each channel from left to right and each frequency must be higher than the preceding frequency.
• The frequency that is duplicated, or out of an amateur
band, cannot be programmed.
yyPush [EXIT/SET] several times.
• Exits the set mode.
4-15
4
BASIC OPERATIONS
D About the 5 MHz frequency band operation (USA version only)
Operation on the 5 MHz frequency band is allowed on
5 discrete frequencies and must adhere to the following:
• The USB, USB Data, CW, and PSK modes.
• Maximum of 100 watts ERP (Effective Radiated Power)
• 2.8 kHz bandwidth (maximum)
To assist you in operating within the rules specified
by the FCC, transmission is illegal on any frequencies other than the five shown in the tables below.
• For the USB and USB Data modes
The FCC specifies center frequencies on the 5 MHz
frequency band. However, the transceiver displays
carrier frequency. Therefore, tune the transceiver to
1.5 kHz below the specified FCC channel center frequency.
It is your responsibility to set all controls so that transmission in this frequency band meets the stringent
conditions under which amateur operations may use
these frequencies.
NOTE: We recommend that you store these frequencies, modes and filter settings into memory
channels, for easy recall.
Transceiver Displayed
Frequency
FCC Channel
Center Frequency
5.33050 MHz
5.33200 MHz
5.34650 MHz
5.34800 MHz
5.35700 MHz
5.35850 MHz
5.37150 MHz
5.37300 MHz
5.40350 MHz
5.40500 MHz
• For the CW and PSK modes
The transceiver displays the center frequency. Therefore, tune the transceiver to the specified FCC channel
frequency when you operate in these modes.
4-16
Transceiver Displayed
Frequency
FCC Channel
Center Frequency
5.33200 MHz
5.33200 MHz
5.34800 MHz
5.34800 MHz
5.35850 MHz
5.35850 MHz
5.37300 MHz
5.37300 MHz
5.40500 MHz
5.40500 MHz
FUNCTIONS FOR RECEIVE
Section
■■ Preamplifier………………………………………………………………… 7-2
■■ Attenuator… ……………………………………………………………… 7-2
■■ RIT function………………………………………………………………… 7-3
RIT monitor function… …………………………………………………… 7-3
■■ AGC function… …………………………………………………………… 7-4
Selecting the preset value… …………………………………………… 7-4
Adjusting the AGC time constant………………………………………… 7-4
Setting the AGC time constant preset value…………………………… 7-4
■■ Twin PBT operation… …………………………………………………… 7-5
■■ IF filter selection…………………………………………………………… 7-6
IF filter selection…………………………………………………………… 7-6
Filter passband width setting(except FM mode)… …………………… 7-7
Roofing filter selection… ………………………………………………… 7-8
DSP filter shape…………………………………………………………… 7-8
Filter shape set mode… ………………………………………………… 7-10
■■ Dualwatch operation……………………………………………………… 7-11
■■ Noise blanker……………………………………………………………… 7-12
NB set mode… …………………………………………………………… 7-12
■■ Noise reduction… ………………………………………………………… 7-13
■■ Digital selector… ………………………………………………………… 7-13
■■ Notch function……………………………………………………………… 7-14
7-1
7
FUNCTIONS FOR RECEIVE
■■Preamplifier
The preamp amplifies received signals in the receiver
front end, to improve the S/N ratio and sensitivity. Set
this to preamp 1 or preamp 2 when receiving weak
signals.
➥➥Push [P.AMP] several times to set the preamp OFF,
preamp 1 ON or preamp 2 ON.
(≈) Multi-function keys
For all HF bands
NOTE:
The preamp (P.AMP1 or P.AMP2) cannot be used
while the digital selector is activated.
Also the preamp is automatically disabled when the
digital selector is turned ON.
High-gain preamp for 24 MHz band and
above (Available for all HF and 50 MHz
bands)
✔ About the “P.AMP2”
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.
• When selecting Preamp 1
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).
■■Attenuator
The attenuator prevents a desired signal from distortion when very strong signals are near the desired
frequency or when very strong electric fields, such as
from broadcasting stations, are near your location.
• When selecting Attenuator (6 dB)
➥	Push [ATT] several times to set the attenuator 6 dB,
12 dB, 18 dB or attenuator OFF.
➥	Hold down [ATT] for 1 second several times to set
the attenuator 3 dB, 6 dB, 9 dB, 12 dB, 15 dB, 18
dB, 21 dB or attenuator OFF.
7-2
FUNCTIONS FOR RECEIVE
■■RIT function
[RIT/∂TX]
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.
[RIT]
q Push [RIT] to turn the RIT function ON or OFF.
• “ RIT ” and the shifting frequency appear when the function is ON.
[XFC]
w Rotate the [RIT/∂TX] control.
• Hold down [CLEAR] for 1 second to reset the RIT frequency.
• Push [CLEAR] momentarily to reset the RIT frequency when the quick RIT/∂TX clear function is ON.
(p. 12-18)
• Hold down [RIT] for 1 second to add the shift frequency
to the operating frequency.
• When selecting RIT function
DDRIT monitor function
When the RIT function is ON, holding down [XFC] allows you to monitor the operating frequency directly
(RIT is temporarily cancelled).
✔ For your convenience— Calculate function
The shift frequency of the RIT function can be added/
subtracted to the displayed frequency.
➥ While displaying the RIT shift frequency, hold down
[RIT] for 1 second.
7-3
[CLEAR]
7
FUNCTIONS FOR RECEIVE
■■AGC function
[AGC] control (≈) Multi-function keys
The AGC (auto gain control) controls receiver gain to
produce a constant audio output level even when the
received signal strength varies greatly.
The transceiver has three preset AGC characteristics
(time constant: fast, mid, slow) for non-FM mode.
 he FM mode AGC time constant is fixed as ‘FAST’
(0.1 seconds) and AGC time constant cannot be selected.
[AGC VR] (F) Function keys
AGC indicator
[MAIN DIAL]
[EXIT/SET]
DDSelecting the preset value
q Select non-FM mode.
w	Push [AGC] several times to select AGC fast, AGC
medium (MID) or AGC slow.
• Hold down [AGC VR] for 1 second to turn the AGC function OFF.
• When selecting “AGC-MID”
• When selecting “AGC VR”
DDAdjusting the AGC time constant
q Select non-FM mode.
w	Push [AGC VR], then rotate [AGC] control to adjust
the AGC time constant.
• [AGC VR] indicator above the switch lights green.
DDSetting the AGC time constant preset value
q Select the desired mode (not FM mode).
w	Hold down [AGC] for 1 second to enter AGC set
mode.
e	Push [AGC] several times to select FAST time constant.
r	Rotate [MAIN DIAL] to set the desired time constant
for ‘AGC FAST.’
• AGC screen
• AGC time constant can be set between 0.1 to 8.0 seconds (depends on mode) or turned O
­ FF.
• Hold down [DEF](F) for 1 second to select a default
value.
• Selectable AGC time constant
Mode
t	Push [AGC] to select medium time constant.
y	Rotate [MAIN DIAL] to set the desired time constant
for ‘AGC MID.’
• AGC time constant can be set between 0.1 to 8.0 seconds (depends on mode) or turned O
­ FF.
• Hold down [DEF](F) for 1 second to select a default
value.
u	Push [AGC] to select slow time constant.
i	Rotate [MAIN DIAL] to set the desired time constant
for ‘AGC SLOW.’
Default
(unit: sec.)
Selectable AGC time constant
SSB
0.3 (FAST)
0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0,
2.0 (MID)
2.5, 3.0, 4.0, 5.0, 6.0
6.0 (SLOW)
CW
0.1 (FAST)
0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0,
0.5 (MID)
2.5, 3.0, 4.0, 5.0, 6.0
1.2 (SLOW)
0.1 (FAST)
RTTY
0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0,
0.5 (MID)
PSK
2.5, 3.0, 4.0, 5.0, 6.0
1.2 (SLOW)
• AGC time constant can be set between 0.1 to 8.0 seconds (depends on mode) or turned O
­ FF.
• Hold down [DEF](F) for 1 second to select a default
value.
AM
o	Select another mode (not FM). Repeat steps e to
i if desired.
!0 Push [EXIT/SET] to exit the AGC set mode screen.
FM
7-4
3.0 (FAST)
0.3, 0.5, 0.8, 1.2, 1.6, 2.0, 2.5, 3.0,
5.0 (MID)
4.0, 5.0, 6.0, 7.0, 8.0
7.0 (SLOW)
0.1 (FAST)
Fixed
FUNCTIONS FOR RECEIVE
■■Twin PBT operation
[PBT CLEAR] indicator
In general PBT (Passband Tuning) electronically narrows the IF passband width by shifting the IF frequency to slightly outside of the IF filter passband to reject
interference. The IC-7850 uses DSP for the PBT function. Moving both [TWIN PBT] controls to the same position shifts the IF.
➥ The LCD shows the passband width and shift frequency graphically.
➥ Hold down [FILTER] for 1 second to enter the filter
set screen. Current passband width and shift frequency is displayed in the filter set screen.
➥ To set the [TWIN PBT] controls to the center positions, hold down [PBT CLR] for 1 second.
[FILTER]
[TWIN PBT] control
[EXIT/SET]
[PBT CLEAR]
• When operating [TWIN PBT]
Filter width Shifting value
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 Hz steps
in the SSB/CW/RTTY/PSK modes, and 100 Hz in the
AM mode.
Passband width
(Duplicated with PBT1 and PBT2)
Selected
IF filter
• [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.
• While rotating [TWIN PBT], noise may occur. This comes
from the DSP unit and does not indicate an equipment
malfunction.
• “FILTER” display when operating [TWIN PBT]
• About Passband width and Shift value on the screen
IF center frequency
Passband’s center frequency
SFT: Shift value
BW: Passband width
PBT1
PBT2
• PBT operation example
Both controls at
center position
PBT2
Cutting a lower
passband
Cutting both higher and
lower passbands
PBT2
PBT2
PBT1
PBT1
Passband
IF center frequency
Interference Desired signal
7-5
PBT1
Passband
Interference Desired signal Interference
7
FUNCTIONS FOR RECEIVE
■■IF filter selection
[FILTER] MAIN, SUB
 he transceiver has 3 passband width IF filters for
each mode.
For SSB, CW and PSK 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.
(F) Function keys
[MAIN DIAL]
[EXIT/SET]
For AM mode, the passband width can be set within
200 Hz to 10 kHz in 200 Hz steps. A total of 50 passband widths are available.
 he filter selection is automatically memorized in
each mode.
The PBT shift frequencies are automatically memorized in each filter.
For FM mode, the passband width is fixed and 3 passband widths are available.
• When selecting “FIL1” (Wide)
DDIF filter selection
q Select the desired mode.
w	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.
• When selecting “FIL2” (Mid)
Mode
SSB
SSB-D
CW
PSK
RTTY
AM
AM-D
FM
FM-D
IF filter
FIL1 (3.0 kHz)
FIL2 (2.4 kHz)
FIL3 (1.8 kHz)
FIL1 (1.2 kHz)
FIL2 (500 Hz)
FIL3 (250 Hz)
FIL1 (2.4 kHz)
FIL2 (500 Hz)
FIL3 (250 Hz)
FIL1 (9.0 kHz)
FIL2 (6.0 kHz)
FIL3 (3.0 kHz)
FIL1 (15 kHz)
FIL2 (10 kHz)
FIL3 (7.0 kHz)
Adjustable range (steps)
50 to 500 Hz (50 Hz)
600 Hz to 3.6 kHz (100 Hz)
50 to 500 Hz (50 Hz)
600 Hz to 3.6 kHz (100 Hz)
• When selecting “FIL3” (Narrow)
50 to 500 Hz (50 Hz)
600 Hz to 2.7 kHz (100 Hz)
200 Hz to 10 kHz (200 Hz)
Fixed
7-6
FUNCTIONS FOR RECEIVE
DDFilter passband width setting
(except FM mode)
q	Hold down [FILTER] for 1 second to enter the Filter
set screen.
w Select any mode except FM.
• During the passband width setting
• Passband widths for FM modes are fixed, and cannot be
changed.
e	Push [FILTER] several times to select the desired IF
filter.
r	Push [BW](F), then rotate [MAIN DIAL] to adjust the
desired passband width. Then push [BW](F) again.
Blinks
• While holding down [BW](F), rotating [MAIN DIAL] also
adjusts the passband width. After adjustment, release
[BW](F) to set.
• When selecting the passband width (500 Hz or less)
t If desired, repeat steps w to r.
• Hold down [DEF](F) for 1 second to select the default
value.
y Push [EXIT/SET] to exit filter set screen.
 he PBT shift frequencies are cleared when the
passband width is changed.
 his filter set screen graphically displays the PBT
shift frequencies and CW pitch operations.
7-7
7
FUNCTIONS FOR RECEIVE
■■ IF filter selection (Continued)
DDRoofing filter selection
The IC-7850 has 3, 6 and 15 kHz roofing filters at the
1st IF frequency. The roofing filter provides interference reduction from nearby strong signals.
• Roofing filter set screen
q	Hold down [FILTER] for 1 second to enter filter set
screen.
w Select any mode except FM.
e	Push [ROOFING](F) to select the desired filter width
from 15 kHz (default), 6 kHz and 3 kHz.
• Hold down [DEF](F) for 1 second to select a default
value.
r Push [EXIT•SET] to exit filter set screen.
DDDSP filter shape
(F) Function keys
The type of DSP filter shape for each SSB, SSB data
and CW can be selected independently from soft and
sharp.
q	Hold down [FILTER] for 1 second to enter filter set
screen.
w Select SSB, SSB data or CW mode.
e	Push [SHAPE](F) to select the desired filter shape
from soft and sharp.
r Push [EXIT•SET] to exit filter set screen.
Mode keys
• When selecting “SHARP”
The filter shape can be set for each band (HF and 50
MHz bands), mode, as well as the passband width setting (CW only) independently as your default setting in
filter shape set mode.
7-8
[FILTER] MAIN, SUB
[EXIT/SET]
7
FUNCTIONS FOR RECEIVE
■■ IF filter selection (Continued)
DDFilter shape set mode
The type of DSP filter shape for each SSB, SSB data
and CW can be selected independently from soft and
sharp.
• “FILTER SHAPE SET” screen
q	Hold down [FILTER] for 1 second to enter filter set
screen.
w	Hold down [SHAPE](F) for 1 second to enter filter
shape set mode.
e Push [Y](F) or [Z](F) to select the desired item.
r	Rotate [MAIN DIAL] to select the filter shape from
soft and sharp.
t Push [EXIT/SET] to exit filter shape set mode.
HF SSB (600Hz – )
50M CW ( – 500Hz)
(Default: SHARP)
(Default: SHARP)
Select the filter shape for SSB mode in HF bands.
The set filter shape is automatically used only when
the IF filter is set to 600 Hz or wider.
Select the filter shape for CW mode in 50 MHz band.
The set filter shape is automatically used only when
the IF filter is set to 500 Hz or narrower.
HF SSB-D (600Hz – )
50M CW (600Hz – )
(Default: SHARP)
Select the filter shape for SSB data mode in HF
bands.
The set filter shape is automatically used only when
the IF filter is set to 600 Hz or wider.
HF CW ( – 500Hz)
Select the filter shape for CW mode in 50 MHz band.
 he set filter shape is automatically used only when
the IF filter is set to 600 Hz or wider.
(Default: SHARP)
Select the filter shape for CW mode in HF bands.
The set filter shape is automatically used only when
the IF filter is set to 500 Hz or narrower.
HF CW (600Hz – )
(Default: SHARP)
Select the filter shape for CW mode in HF bands.
The set filter shape is automatically used only when
the IF filter is set to 600 Hz or wider.
50M SSB (600Hz – )
(Default: SOFT)
Select the filter shape for SSB mode in 50 MHz band.
The set filter shape is automatically used only when
the IF filter is set to 600 Hz or wider.
50M SSB-D (600Hz – )
(Default: SHARP)
(Default: SHARP)
Select the filter shape for SSB data mode in 50 MHz
band.
The set filter shape is automatically used only when
the IF filter is set to 600 Hz or wider.
7-10
FUNCTIONS FOR RECEIVE
■■Dualwatch operation
Dualwatch monitors two frequencies simultaneously.
The IC-7850 has 2 independent receiver circuits so
that you can use dualwatch with no compromises,
even on different bands and modes.
[SPLIT]
[DUALWATCH]
[CHANGE]
q	Set the desired frequency and mode into the main
band.
w Push [DUALWATCH].
•“
” appears.
• Holding down [DUALWATCH] for 1 second, the sub band
is equalized at the same time. This quick dualwatch
function can be turned OFF in set mode. (p. 12-15)
[MAIN DIAL]
e Rotate the sub dial to set the desired frequency.
r	Push [SUB] to enables the sub band access when
changing the frequency band, operating mode, etc.
in sub band.
[SUB DIAL]
• During dualwatch operation
• Push [MAIN] for the main band access.
t	Rotate [AF] for sub band to adjust the sub band audio level.
y	To transmit on the sub band readout, push
[CHANGE] or [SPLIT].
NOTE:
• A beat note may be heard depending on the frequency combination.
• Receiver sensitivity will be decreased when the
same frequency band and the same antenna are
selected during dualwatch.
• The RIT function can be used for the main readout
only.
• The ∂TX function can be used for the transmit
readout (main readout when the split function
OFF; sub readout when the split function ON).
• Split frequency operation during dualwatch
“TX” appears on the sub band
•F
7-11
7
FUNCTIONS FOR RECEIVE
■■Noise blanker
The noise blanker eliminates pulse-type noise such as
the noise from car ignitions. The noise blanker is not
available for FM mode.
[NB] control MAIN, SUB
[NB] indicator
q	Push [NB] to turn the noise blanker function ON or
OFF.
• [NB] indicator above their switch lights green.
w	Rotate [NB] control to adjust the noise blanker
threshold level.
[NB] MAIN, SUB
When using the noise blanker, received signals
may be distorted if they are excessively strong or
the noise type is other than impulse. Turn the noise
blanker OFF, or rotate [NB] control to a shallow position in this case.
DDNB set mode
• “NB” screen
To deal with various type of noises, attenuation level
and noise width can be set in NB set mode.
q	Hold down [NB] for 1 second to enter NB set
mode.
w Push [Y](F) or [Z](F) to select the desired item.
e	Rotate [MAIN DIAL] to set the desired level or value.
• Hold down [DEF](F) for 1 second to select a default
value.
r Push [EXIT/SET] to exit NB set mode.
NB Depth
NB Width
(Default: 8)
Set the noise attenuation level from 1 to 10.
Set the noise pulse width from 1 to 100.
7-12
(Default: 50)
FUNCTIONS FOR RECEIVE
■■Noise reduction
The noise reduction function reduces random noise
components and enhances desired signals which are
buried in noise. The DSP does the random noise reduction function.
[NR] MAIN, SUB
[NR] indicator
q	Push the [NR] to turn the noise reduction ON.
• [NR] indicator above their switch lights green.
w	Rotate the [NR] control to adjust the noise reduction
level.
e	Push the [NR] switch to turn the noise reduction
OFF.
[NR] control MAIN, SUB
• [NR] indicator lights off.
Deep rotation of the [NR] control results in audio
signal masking or distortion. Set the [NR] control for
maximum readability.
■■Digital selector
The digital selector manually adjusts the center frequency of the automatic pre-selector. The digital selector functions within 1.5 MHz to 29.999999 MHz range.
[DIGI-SEL] indicator
[DIGI-SEL]MAIN, SUB
The automatic pre-selector adds selectivity ahead of
the 1st mixer. This reduces intermodulation distortion
from the nearby strong signals.
The automatic pre-selector tracks the frequency tuning,
changing it’s resonant frequency in discrete steps.
q	Push [DIGI-SEL] to turn the digital selector ON or
OFF.
[DIGI-SEL] control MAIN, SUB
• [DIGI-SEL] indicator above their switch lights green.
w	Rotate [DIGI-SEL] control to adjust the center frequency.
NOTE:
• When rotating [MAIN DIAL] (or sub dial during dualwatch or split function) while the digital selector is
activated, mechanical noise may be heard due to
the switching noise from internal relays.
• The preamp (P.AMP1 or P.AMP2) cannot be used
while the digital selector is activated.
7-13
7
FUNCTIONS FOR RECEIVE
■■Notch function
his transceiver has auto and manual notch functions.
The auto notch function uses DSP to automatically attenuates beat tones, tuning signals, etc., even if they
are moving. The manual notch can be set to attenuate
a frequency via the [NOTCH] control.
The auto notch can be used in SSB, AM and FM
modes.
The manual notch can be used in SSB, CW, RTTY,
PSK and AM modes.
[NOTCH] indicator [NOTCH] control MAIN, SUB
[NOTCH] MAIN, SUB
➥ Push

[NOTCH] to toggle the notch function between
auto, manual and OFF in SSB and AM modes.
➥P
 ush [NOTCH] to turn the manual notch function
ON or OFF in CW mode.
➥P
 ush [NOTCH] to turn the auto notch function ON or
OFF in FM mode.
• Auto notch indication
• [NOTCH] indicator above their switch lights green.
• Hold down [NOTCH] for 1 second to select the notch
filter width for manual notch from wide, middle and narrow.
• Set to attenuate a frequency for manual notch via the
[NOTCH] control.
• “AN” appears when auto notch is in use.
• “MN” appears when manual notch is in use.
While tuning the manual notch, noise may be
heard. This comes from the DSP unit and does not
indicate an equipment malfunction.
• Manual notch indication
• When selecting the notch filter width for manual notch
7-14
FUNCTIONS FOR TRANSMIT
Section
■■ VOX function… ……………………………………………………………
DDUsing the VOX function…………………………………………………
DDAdjusting the VOX function… …………………………………………
DDVOX set mode… ………………………………………………………
■■ Break-in function… ………………………………………………………
DDSemi break-in operation… ……………………………………………
DDFull break-in operation… ………………………………………………
■■ ∂TX function ………………………………………………………………
DD∂TX monitor function… ………………………………………………
■■ Monitor function……………………………………………………………
■■ Transmit filter width setting (SSB only)… ………………………………
■■ Speech compressor (SSB only)… ………………………………………
■■ Split frequency operation… ………………………………………………
■■ Quick split function…………………………………………………………
DDSplit lock function… ……………………………………………………
8-1
8-2
8-2
8-2
8-2
8-4
8-4
8-4
8-5
8-5
8-5
8-6
8-6
8-7
8-8
8-8
8
FUNCTIONS FOR TRANSMIT
■■VOX function
The VOX (Voice-Operated Transmission) function
switches between transmit and receive with your voice.
This function provides “hands-free” operation.
DDUsing 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] indicator
[VOX/BK-IN]
• “VOX” appears while the VOX is in use.
• [VOX/BK-IN] indicator above this switch lights green.
Mode keys
[ANTI VOX]
[VOX GAIN]
DDAdjusting the VOX function
q Select a phone mode (SSB, AM, FM).
w Push [VOX/BK-IN] to turn VOX function ON.
e	While speaking into the microphone with your normal voice level, rotate [VOX GAIN] to the point
where the transceiver is continuously transmitting.
r	During receive, rotate [ANTI VOX] to the point where
the transceiver does not switch to transmit due to
received audio from the speaker.
t	Adjust the VOX delay and the VOX voice delay in
VOX set mode, if necessary.
[MAIN DIAL]
[EXIT/SET]
VOX indicator
8-2
FUNCTIONS FOR TRANSMIT
DDVOX set mode
q	Hold down [VOX/BK-IN] for 1 second to enter VOX
set mode.
w	Select the desired item using [Y](F) or [Z](F).
e	Rotate the main dial to the desired set value or condition.
• VOX Delay
• Hold down [DEF](F) for 1 second to select a default
value.
r Push [EXIT/SET] to exit VOX set mode.
• VOX Voice Delay
VOX Delay
VOX Voice Delay
(Default: 0.2s)
Set the VOX delay for a convenient interval before returning to receive within 0 to 2.0 seconds range.
(Default: OFF)
Set the VOX voice delay to prevent mis-transmission
of your voice when switching to transmit.
Short, Mid., Long and OFF settings are available.
When using the VOX voice delay, turn the TX monitor function OFF, the transmitted audio will be
echoed.
8-3
8
FUNCTIONS FOR TRANSMIT
■■Break-in function
[KEY SPEED]
The break-in function is used in CW mode to automatically toggle the transceiver between transmit and
receive when keying. The IC-7850 is capable for full
break-in or semi break-in.
[DELAY]
DDSemi break-in operation
During semi break-in operation, the transceiver selects
transmit when keying, then automatically returns to receive after a pre-set time after you stop keying.
[VOX/BK-IN]
Mode keys
[VOX/BK-IN] indicator
q Push [CW] to select CW or CW-R mode.
w	Push [VOX/BK-IN] several times to turn the semi
break-in function ON.
• Semi
break-in ON
• “BK IN” appears.
e Rotate [DELAY] to set the break-in delay time (the
delay from transmit to receive).
 When using a paddle, rotate [KEY SPEED] to adjust the keying speed.
DDFull break-in operation
During full break-in operation, the transceiver automatically selects transmit while keying and returns to
receive immediately after keying is finished.
• Full
q Push [CW] to select CW or CW-R mode.
w	Push [VOX/BK-IN] several times to turn the full
break-in function ON.
• “F-BK IN” appears.
 When using a paddle, rotate [KEY SPEED] to adjust the keying speed.
8-4
break-in ON
FUNCTIONS FOR TRANSMIT
■■∂TX function
The ∂TX function shifts the transmit frequency up to
±9.999 kHz in 1 Hz steps (10 Hz steps when cancelling the 1 Hz step readout) without moving the receive
frequency.
[XFC]
[TX]
[TX/RIT]
[CLEAR]
• See (3 on p. 1-11 for function description.
q Push [∂TX].
• “ ∂TX ” appears.
w Rotate [RIT/∂TX].
e	To reset the ∂TX frequency, hold down [CLEAR] for
1 second.
• Push [CLEAR] momentarily to reset the RIT frequency
when the quick RIT/∂TX clear function is ON. (p. 1218)
 ∂TX function ON
r To cancel the ∂TX function, push [∂TX] again.
• “ ∂TX ” disappears.
DD∂TX monitor function
When the ∂TX function is ON, holding down [XFC] allows you to monitor the operating frequency directly.
✔ For your convenience — Calculate function
The shift frequency of the ∂TX function can be added/
subtracted to the displayed frequency.
➥ While displaying the ∂TX shift frequency, hold down
[∂TX] for 1 second.
■■Monitor function
The monitor function allows you to monitor your transmit IF signals in any mode. Use this to check voice
characteristics while adjusting SSB transmit parameter. (p. 12-4) The CW sidetone functions regardless
of the [MONI] switch setting.
[MONI] indicator
q	Push [MONI] to switch the monitor function ON or
OFF.
• [MONI] indicator above this switch lights green.
w	Rotate [MONI GAIN] for the clearest audio output
while holding [PTT] and speaking into the microphone.
[MONI]
NOTE: When using the VOX voice delay, turn the
monitor function OFF; or transmitted audio will be
echoed.
8-5
[MONI GAIN]
8
FUNCTIONS FOR TRANSMIT
■■Transmit filter width setting (SSB only)
The transmit filter width for SSB mode can be selected
from wide, middle and narrow.
() Multi function keys
➥	Operating in the SSB mode, hold down the Multifunction keys’ [COMP]() for 1 second several
times to select the desired transmit filter width from
wide, middle and narrow.
• The filter functions regardless of the speech compressor use.
• The following filters are specified as the default. Each of
the filter width can be re-set in level set mode. (p. 12-5)
WIDE : 100 Hz to 2.9 kHz
MID : 300 Hz to 2.7 kHz
NAR : 500 Hz to 2.5 kHz
[SSB]
• LEVEL SET screen
■■Speech compressor (SSB only)
The speech compressor increases average RF output power, improving signal strength and readability in
SSB mode only.
[MIC] ()Multi function keys
q	Select USB or LSB mode and adjust [MIC] to a suitable level.
• Push [METER]() several times to select the ALC meter for microphone gain adjustment.
w	Push [COMP]() to turn the speech compressor
ON.
e Push [METER]() several times to select the COMP
meter.
r	While speaking into the microphone, rotate
[COMP]() control, so that the COMP meter reads
within the COMP zone (10 to 20 dB range) with your
normal voice level.
 When the COMP meter peaks exceed the COMP
zone, your transmitted voice may be distorted.
t Push [METER]() several times to select the ALC
meter.
y	While speaking into the microphone, rotate [DRIVE],
so that the ALC meter reads within the 30 to 50%
range of the ALC zone with your normal voice level.
[COMP GAIN]
[SSB]
[DRIVE]
COMP zone
✔ For your convenience
Hold down [METER]() for 1 second to display the
multi-function meter that can check the ALC and
COMP level at a glance.
8-6
ID
0 10
SWR 0
COMP
Po
+20 +40
10
50
1.5 102
ALC
100 150
200
20
44 52V VD
+60dB
15
250
dB
FUNCTIONS FOR TRANSMIT
■■Split frequency operation
[XFC]
Split frequency operation allows you to transmit and
receive in the same mode on two different frequencies.
The split frequency operation is performed using 2 frequencies on the main and sub readouts.
[SPLIT] indicator
10-keys
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 mode.
w	Push [SPLIT] momentarily, then hold down [M=S]
for 1 second.
[M=S]
• The quick split function is much more convenient for selecting the transmit frequency. See the next section for
details.
• The equalized transmit frequency and “ SPLIT ” appear
on the LCD.
• [SPLIT] indicator lights.
• “TX” appears to show the transmit frequency readout.
[CHANGE]
[SUB DIAL]
[SPLIT]
[MAIN DIAL]
• When the split function ON
e	Set the transmit frequency to 21.310 MHz in one of
following ways.
➥ Rotate the main dial while holding down [XFC].
		 ➥ Rotate the sub dial.
• The transmit frequency can be monitored while holding down [XFC] or using dualwatch.
• When [XFC] is pushed
r	Now you can receive on 21.290 MHz and transmit
on 21.310 MHz.
To change the transmit and receive frequencies, push
[CHANGE] to exchange the main and sub readouts.
✔ CONVENIENT
• 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.
• The split frequency operation is ready
• 1 kHz to 9.999 MHz can be set.
• When you require a minus shift direction, push [•] 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] then [SPLIT].
To transmit on 3 kHz lower frequency:
- Push [F-INP], [•], [3] then [SPLIT].
• Split lock function
Accidentally releasing [XFC] while rotating the main
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 holding down [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. 12-16)
8-7
8
FUNCTIONS FOR TRANSMIT
■■Quick split function
[SPLIT]
[SPLIT] indicator
When you find a DX station, an important consideration is how to set the split frequency.
When you hold down the [SPLIT] switch for 1 second,
split frequency operation is turned ON, the sub readout
is equalized to the main readout frequency and enters
standby for transmit frequency input.
This shortens the time needed to start split frequency
operation.
[XFC]
The quick split function is ON by default. For your convenience, it can be turned OFF in set mode. (p. 12-15)
In this case, the [SPLIT] switch does not equalize the
main and sub readout frequencies.
[MAIN DIAL]
[SUB DIAL]
• When the quick split function ON
q	Suppose you are operating at 21.290 MHz (USB) in
VFO mode.
w Hold down [SPLIT] for 1 second.
• Split frequency operation is turned ON.
• The sub readout is equalized to the main readout frequency.
• “ F-INP ” indicator appears and the sub readout enters
standby for transmit frequency input.
e Enter the desired offset frequency from the keypad
then push [SPLIT], or set the transmit frequency
with the main dial while pushing [XFC], or with the
sub dial.
• When [XFC] is pushed
• “ F-INP ” indicator disappears when [XFC] is pushed or
the main/sub dial is rotated.
• Offset frequency setting with the keypad— example
To transmit on 1 kHz higher frequency:
			 - Push [F-INP], [1] then [SPLIT].
To transmit on 3 kHz lower frequency:
- Push [F-INP], [•], [3] then [SPLIT].
DDSplit 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
main dial, changes the receive frequency. The split lock
function is ON by default, but can be turned OFF in set
mode. (p. 12-16)
[LOCK] indicator for MAIN
q	While split frequency operation is ON, push [LOCK]
for both main and sub band to activate the split lock
function.
w	While pushing [XFC], rotate the main dial to change
the transmit frequency.
[XFC]
[MAIN DIAL]
[LOCK] for MAIN
• If you accidentally release [XFC] while rotating the main
dial, the receive frequency does NOT change.
8-8
ANTENNA TUNER OPERATION
Section
13
■■ Antenna connection and selection… …………………………………… 13-2
■■ Rreceive Antena-I/O selection…………………………………………… 13-2
■■ Antenna memory settings………………………………………………… 13-3
DDAntenna type selection………………………………………………… 13-3
DDTemporary memory… ………………………………………………… 13-4
DDAntenna selection mode… …………………………………………… 13-4
DDReceive antenna I/O setting…………………………………………… 13-5
■■ Antenna tuner operation… ……………………………………………… 13-6
DDTuner operation… ……………………………………………………… 13-6
DDIf the tuner cannot tune the antenna… ……………………………… 13-7
13-1
13
ANTENNA TUNER OPERATION
■■Antenna connection and selection
The IC-7850 has four antenna connectors for the HF/50
MHz bands, [ANT1], [ANT2], [ANT3], and [ANT4].
(≈) Multi-function keys
For each operating band the IC-7850 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
allows automatic switching of four separate antennas
for HF and 50 MHz bands operation.
• Antenna connection example
• Antenna selection mode: “Auto”
After an antenna has been selected for use (by pushing [ANT]), the antenna is automatically selected
whenever that band is used.
RX
only
50 MHz 21/28 MHz 3.5/7 MHz
bands
bands
bands
[EXAMPLE]: a 3.5/7 MHz antenna is connected to
[ANT1], a 21/28 MHz antenna is connected to [ANT2],
a 50 MHz antenna is connected to [ANT3]. When the
antenna selector function is set to “Auto,” an antenna is
automatically selected when changing bands.
[ANT4] can be used for receive only.
ANT4
ANT3
ANT2
ANT1
• Antenna selection mode: “Manual”
When “Manual” is selected, you can use the all antenna connectors, [ANT1] [ANT2], [ANT3] and [ANT4],
however, band memory does not function. In this case
you must select an antenna manually.
■■Rreceive Antena-I/O selection
The IC-7850 has two receive antenna connectors,
[RX-ANT A] and [RX-ANT B] on the rear panel.
In the default setting, receive antenna connectors,
[RX ANT-IN] and [RX ANT-OUT], deactivated and are
connected internally by the switching relay. If you want
to connect an external preamp or low-pass filter between the [RX ANT-IN] and [RX ANT-OUT], you must
activate them as described page 13-6.
IN OUT
[RX-ANT B]
13-2
IN OUT
[RX-ANT A]
ANTENNA TUNER OPERATION
13
■■Antenna memory settings
(≈) Multi-function keys
This function stores the antenna connector number for
each frequency band.
q	Push [EXIT/SET] several times to close multi-function screen, if necessary.
w	Hold down [ANT] for 1 second to select antenna set
screen.
e	Select the desired frequency band with a band key.
r	Push [ANT] several times to select the desired antenna number that you want to set for the selected
frequency band.
Band keys
(F) Function keys
• “★” appears.
• “ANT” screen
t	Hold down [ANT MW](F) for 1 second to store the
antenna selection into the antenna memory.
• “★” disappears.
y	Repeat the steps e to t to store the antenna selection for another frequency bands, if desired.
u	Push [EXIT/SET] to exit antenna set screen.
‘ANT1’ is set.
DDAntenna type selection
Displays [RX-I/O]
connection status
When no antenna is connected to [ANT2], [ANT3],
and/or [ANT4], these antenna connectors can be deactivated— deleting the antenna number from selection. This prevent the transceiver from accidentally
transmitting into an empty antenna connector.
In addition, a receive-only antenna can be specified
for [ANT4].
• Antenna type selection on the “ANT” screen
 Select the antenna set screen as described above.
w	Push [ANT TYPE](F) to select antenna type set
screen.
e	Push [Y](F) or [Z](F) to select the desired antenna.
r	Rotate the main dial to select the desired antenna
condition from TX/RX, RX (ANT4 only) and OFF.
• TX/RX : Select when an antenna is connected.
• OFF : Select when no antenna is connected.
• RX
: Select when a receive only antenna is
connected. (available for the [ANT4] only)
t Push [EXIT/SET] to exit antenna type set screen.
All antennas, connected to [ANT1]~[ANT4], are set as
for ‘TX/RX.’
• “ANT TYPE” screen
(≈) Multi-function keys
✔ For your information
The “OFF” antennas cannot be selected with [ANT]
switch operation, or with the antenna memory setting.
When “RX” is selected for [ANT4], “1/R,” “2/R” and
“3/R” selections will be added for the selection for both
[ANT] switch operation and the antenna memory setting. In these selections, using the antenna connected
to [ANT1], [ANT2] and/or [ANT3] for transmission and
using the antenna connected to [ANT4] for reception.
(F) Function keys
13-3
13
ANTENNA TUNER OPERATION
■■ Antenna memory settings (Continued)
DDTemporary memory
The antenna temporary memory memorizes the manually selected antenna. The selected antenna will be
re-called even if frequency band has been changed.
(≈) Multi-function keys
q Select the antenna set screen.
w	Push [TEMP-M](F) to turn the temporary memory
ON or OFF.
e	Select the desired frequency band with a band key.
r Push [ANT] to select the desired antenna.
(F) Function keys
• “★” appears when a different antenna from the original
is selected.
t Push [ANT MR](F) to re-call the original antenna.
• When the temporary memory is ON.
• “★” disappears.
y Push [EXIT/SET] to exit antenna set screen.
CAUTION: Before transmitting with the manually
selected antenna, make sure the selected antenna
suits the operating frequency. Otherwise the transceiver may be damaged.
Appears when a different
antenna from the original
is selected.
The temporary
memory is ON.
DDAntenna selection mode
The automatic antenna selection (antenna memory)
and the [ANT] switch function can be deactivated if
desired.
• Antenna selection mode
Push [[ANT] SW](F) to select the
antenna selection mode.
q Select the antenna set screen.
w	Push [[ANT] SW](F) to select the antenna selection
from Auto, OFF and Manual.
• Auto : Use the antenna memory. Antenna selection with [ANT] switch is also available.
• OFF : Only the antenna connected to [ANT1]
can be used. [ANT] switch is deactivated.
• Manual : Deactivate the antenna memory function. Antenna can be selected with [ANT]
switch operation only.
e Push [EXIT/SET] to exit antenna set screen.
• Options of the Antenna selection mode
13-4
ANTENNA TUNER OPERATION
13
DDReceive antenna I/O setting
In the default setting, receive antenna connectors, [RX
ANT-IN] and [RX ANT-OUT], on the rear panel are deactivated and are connected internally by the switching relay. If you want to connect an external preamp or
low-pass filter between the [RX ANT-IN] and [RX ANTOUT], you must activate them as described below.
IN OUT
qqSelect
the antenna set screen.
wwSelect the desired frequency band with a band key.
eePush [RX-I/O](F) to activate the receive antenna
connectors.
[RX-ANT B]
IN OUT
[RX-ANT A]
• “RX-I/O” indicators appear when [RX-I/O A] and/or [RXI/O B] is active.
rrRepeat steps w and e, if desired.
ttPush [EXIT/SET]
• When the RX-I/O A is selected in the 10 MHz band
• The Antenna Set screen closed.
• When the RX-I/O is selected
OFF
RX-I/O A
Pushing [RX-I/O](F) changes setting
RX-I/O B
• When the RX-I/O is selected (1)
NOTE:
• When common antenna is set to the MAIN and SUB
bands, different RX-I/O settings cannot be set.
• When different antennas are set to the MAIN and
SUB bands, common RX-I/O setting cannot be set.
• When the SUB band is selected in the Dualwatch
function OFF, you cannot change the RX-I/O setting.
	However, if you additionally turn ON the SPLIT
function and holding down [XFC], you can change
the RX-I/O setting.
The setting is Displayed
Set to RX-I/O A
Set to [RX-I/O] through
• When the RX-I/O is selected (2)
When common antenna is selected on the MAIN and SUB bands,
different RX-I/O settings cannot be set.
Thus, the transceiver automatically sets the RX-I/O setting of
inoperating band to correct setting same as the opeating side.
13-5
13
ANTENNA TUNER OPERATION
■■Antenna tuner operation
The internal automatic antenna tuner matches the
transceiver to the connected antenna automatically. After 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.
 AUTION: NEVER transmit with the tuner ON when
no antenna is connected. This will damage the
transceiver. Be careful of the antenna selection.
DDTuner 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, [TUNER] switch indicator lights
green.
• While tuning, [TUNER] switch indicator blinks green.
NOTE:
• NEVER transmit without an antenna properly
connected to antenna port in use.
• When 2 or more 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,
hold down [TUNER] for 1 second to start manual
tuning.
• The internal tuner may not be able to tune in AM
mode. In such cases, hold down [TUNER] for 1
second to manually tune.
[TUNER]
• MANUAL TUNING
During SSB operation at low voice levels, the internal
tuner may not be tuned correctly. In such cases, manual tuning is helpful.
➥ Hold down [TUNER] for 1 second, to start manual
tuning.
• A side tone is emitted and [TUNER] switch indicator
blinks red while tuning.
• If the tuner cannot reduce the SWR to less than 1.5:1
after 20 seconds 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. 12-16).
13-6
[TUNER] indicator
ANTENNA TUNER OPERATION
■■ Antenna tuner operation (Continued)
• 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 “hold
down [TUNER]” operation and activates for the first
transmission on a new frequency.
This function is turned ON in set mode. (p. 12-16).
• 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,
and turn OFF the IC-7850’s tuner. 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.
DDIf the tuner cannot tune the antenna
Check the following and try again:
• the [ANT] connector selection.
• the antenna connection and feedline.
• the untuned 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 feedline 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]: S
 uppose 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.
q	Set 3.55 MHz and hold down [TUNER] for 1 second to
start manual tuning.
w	Set 3.80 MHz and hold down [TUNER] for 1 second to
start manual tuning.
13-7
13
IC-7851
#03 (Europe)
IC-7850
#23 (Europe-01)
IC-7851
#04 (France)

■ AT ■ BE ■ CY ■ CZ ■ DK ■ EE
■ FI ■ FR ■ DE ■ GR ■ HU ■ IE
■ IT ■ LV ■ LT ■ LU ■ MT ■ NL
■ PL ■ PT ■ SK ■ SI ■ ES ■ SE
■ GB ■ IS ■ LI ■ NO ■ CH ■ BG
■ RO ■ TR ■ HR

■ AT ■ BE ■ CY ■ CZ ■ DK ■ EE
■ FI ■ FR ■ DE ■ GR ■ HU ■ IE
■ IT ■ LV ■ LT ■ LU ■ MT ■ NL
■ PL ■ PT ■ SK ■ SI ■ ES ■ SE
■ GB ■ IS ■ LI ■ NO ■ CH ■ BG
■ RO ■ TR ■ HR
IC-7851

#05 (United King■ AT ■ BE ■ CY ■ CZ ■ DK ■ EE
dom)
■ FI ■ FR ■ DE ■ GR ■ HU ■ IE
■ IT ■ LV ■ LT ■ LU ■ MT ■ NL
■ PL ■ PT ■ SK ■ SI ■ ES ■ SE
■ GB ■ IS ■ LI ■ NO ■ CH ■ BG
■ RO ■ TR ■ HR
IC-7851
#06 (Italy)

■ AT ■ BE ■ CY ■ CZ ■ DK ■ EE
■ FI ■ FR ■ DE ■ GR ■ HU ■ IE
■ IT ■ LV ■ LT ■ LU ■ MT ■ NL
■ PL ■ PT ■ SK ■ SI ■ ES ■ SE
■ GB ■ IS ■ LI ■ NO ■ CH ■ BG
■ RO ■ TR ■ HR
IC-7851
#07 (Spain)

■ AT ■ BE ■ CY ■ CZ ■ DK ■ EE
■ FI ■ FR ■ DE ■ GR ■ HU ■ IE
■ IT ■ LV ■ LT ■ LU ■ MT ■ NL
■ PL ■ PT ■ SK ■ SI ■ ES ■ SE
■ GB ■ IS ■ LI ■ NO ■ CH ■ BG
■ RO ■ TR ■ HR
1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003, Japan

---

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