Icom IC-756PRO User Manual
INSTR UCTION MANUAL
HF/50 MHz
ALL MODE TRANSCEIVER
i756PRO
i
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-756PRO.
EXPLICIT DEFINITIONS
RWARNING HIGH V OLTAGE! NEVERattach
an antenna or internal antenna connector during transmission.This may result in an electrical shock or burn.
R NEVER apply AC to the [DC13.8V] jack on the
transceiver rear panel.This could cause a fire or ruin
the transceiver.
RNEVER apply more than 16 V DC , such as a 24 V
battery, to the [DC13.8V] jack on the transceiver rear
panel.This could cause a fire or ruin the transceiver.
RNEVER let metal, wire or other objects touch any
internal par t or connectors on the rear panel of the
transceiver. This may result in an electric shock.
NEVER expose the transceiver to rain, snow or any
liquids.
AVOID using or placing the transceiver in areas with
temperatures below –10°C (+14°F) or above +60°C
(+140°F). Be aware that temperatures on a vehicle’s
dashboard can exceed 80°C (+176°F), resulting in permanent damage to the transceiver if left there for extended periods.
AVOID placing the transceiver in excessively dusty environments or in direct sunlight.
AVOID placing the transceiver against walls or putting
anything on top of the transceiver. This will obstruct
heat dissipation.
Place unit in a secure place to avoid inadvertent use by children.
During mobile operation, DO NOT operate the transceiver without running the vehicle’s engine. When
transceiver power is ON and your vehicle’s engine is
OFF, the vehicle’s battery will soon become e xhausted.
Make sure the transceiver power is OFF before starting the vehicle.This will avoid possible damage to the
transceiver by ignition voltage spikes.
During maritime mobile operation, keep the transceiver
and microphone as far away as possible from the magnetic navigation compass to prev ent erroneous indications.
BE CAREFUL! The heatsink will become hot when
operating the transceiver continuously for long periods.
BE CAREFUL! If a linear amplifier is connected, set
the transceiver’s RF output power to less than the linear amplifier’s maximum input level, otherwise, the linear amplifier will be damaged.
Use Icom microphones only (supplied or optional).
Other manufacturer’s microphones have different pin
assignments, and connection to the IC-756PRO may
damage the transceiver.
PRECAUTIONS
Versions of the IC-756PRO which display the “CE”
symbol on the serial number seal, comply with the
European harmonised standard ETS300 684
(EMC product standard for Commercially A vailable
Amateur Radio Equipment).
WORD
R
WARNING
CAUTION
NOTE
DEFINITION
Personal injury, fire hazard or electric
shock may occur.
If disregarded, inconvenience only.
No risk of personal injury, fire or
electric shock.
Equipment damage may occur.
Spurious may be received near the following frequencies.
These are made in the internal circuit and does not indicate a
transceiver malfunction:
6.144 MHz, 8.000 MHz,
12.288 MHz, 12.890 MHz (when spectrum scope is ON),
18.433 MHz, 24.573 MHz
SUPPLIED ACCESSORIES
The transceiver comes with the f ollo wing accessories.
Qty.
q DC power cable (OPC-025D) ............................ 1
w Hand microphone (HM-36) ................................ 1
e Spare fuses (FGB 30 A) .................................... 2
r Spare fuse (FGB 5 A) ........................................ 1
t CW keyer plug (AP-330) .................................... 1
1
1
TABLE OF CONTENTS
qwe
r
t
IMPORTANT ........................................ i
EXPLICIT DEFINITIONS ..................... i
PRECAUTIONS ................................... i
1 TABLE OF CONTENTS ................ 1
2 PANEL DESCRIPTION ........... 2–13
■ Front panel ..................................... 2
■ Microphone (HM-36) ...................... 9
■ LCD display .................................. 10
■ Screen menu arrangement ........... 11
■ Rear panel .................................... 12
3 INSTALLATION AND
CONNECTIONS ................... 14–21
■ Unpacking .................................... 14
■ Selecting a location ...................... 14
■ Grounding ..................................... 14
■ Antenna connection ..................... 14
■ Required connections ................... 15
■ Advanced connections ................. 16
■ Power supply connections ............ 17
■ Linear amplifier connections ......... 18
■ Transverter jack information ......... 19
■ External antenna selector or
antenna tuner connections ........... 20
■ FSK and AFSK (SSTV)
connections .................................. 21
4 FREQUENCY SETTING ....... 22–25
■ When first applying power
(CPU resetting) ............................. 22
■ Initial settings ................................ 22
■ VFO description ............................ 23
■ Frequency setting with the
tuning dial ..................................... 24
■ Direct frequency entry with
the keypad .................................... 24
■ Advanced tuning functions ........... 25
5 RECEIVE AND TRANSMIT .. 26–49
■ Mode selection ............................. 26
■ Twin PBT operation ...................... 26
■ Notch function .............................. 27
■ Noise reduction ............................ 27
■ Noise blanker ............................... 27
■ RTTY filter/Twin peak filter ........... 28
■ CW reverse mode ......................... 28
■ RTTY reverse mode ..................... 28
■ CW pitch control ........................... 29
■ IF filter selection ........................... 29
■ AGC function ................................ 30
■ Dualwatch operation ..................... 31
■ Split frequency operation .............. 32
■ Quick split function ....................... 33
■ RIT and ∂TX ................................ 34
■ Monitor function ............................ 35
■ VOX function ................................. 35
■ Meter function ............................... 36
■ SWR reading ................................ 36
■ Speech compressor ..................... 37
■ Digital voice recorder .................... 38
■ RTTY decoder .............................. 41
■ RTTY tuning meter ....................... 41
■ Electronic CW keyer ..................... 42
■ Memory keyer ............................... 43
■ Spectrum scope screen ............... 44
■ Automatic antenna selection ........ 45
■ Dial lock function .......................... 45
■ Repeater operation ....................... 46
■ Tone squelch operation ................ 47
■ Antenna tuner operation ............... 48
■ Optional external tuner
operation ...................................... 49
6 MEMORY OPERATION ........ 50–55
■ Memory channels ......................... 50
■ Memory channel selection ........... 50
■ Memory channel screen ............... 51
■ Memory channel programming ..... 52
■ Frequency transferring ................. 53
■ Memory names ............................ 54
■ Memory clearing ........................... 54
■ Memo pads ................................... 55
7 SCANS ................................. 56–61
■ Scan types .................................... 56
■ Preparation ................................... 56
■ Programmed scan operation ........ 57
■ ∂F scan operation ........................ 57
■ Fine programmed scan/
fine ∂F scan ................................. 58
■ Memory scan operation ................ 58
■ Select memory scan operation ..... 59
■ Setting select memory channels .. 59
■ Scan set mode ............................. 60
■ Tone scan ..................................... 61
8 CLOCK AND TIMERS .......... 62–63
■ Setting the current time ................ 62
■ Setting power-on time .................. 62
■ Setting power-off period ............... 63
■ Timer operation ............................ 63
9 SET MODE ........................... 64–72
■ Set mode description ................... 64
■ Level set mode ............................. 65
■ Display set mode .......................... 66
■ Timer set mode ............................ 67
■ Miscellaneous (others) set mode .. 68
10 OPTION INSTALLATION ............ 73
■ Opening the transceiver’s case .... 73
■ UT-102 VOICE SYNTHESIZER
UNIT
.............................................. 73
11 MAINTENANCE ................... 74 –76
■ Troubleshooting ............................ 74
■ Fuse replacement ......................... 75
■ Clock backup battery
replacement .................................. 75
■ Tuning dial brake adjustment ........ 76
■ Frequency calibration
(approximate)................................ 76
12 INTERNAL VIEWS ...................... 77
13 CONTROL COMMAND ........ 78–79
■ Remote jack (CI-V) information .... 78
14 SPECIFICATIONS ....................... 80
15 OPTIONS ..................................... 81
■ Front panel
q POWER SWITCH [POWER/TIMER]
➥Push momentarily to turn power ON.
•Turn the optional DC power supply ON in advance.
•A/D convertor calibration of the DSP unit starts and it
takes 10 sec.
➥Push momentarily to toggle the timer function ON
and OFF.(p.63)
•The power switch lights while the timer function is ON.
➥Push for 2 sec.to turn power OFF.
w TRANSMIT SWITCH [TRANSMIT]
Selects transmitting or receiving.
•The [TX] indicator lights red while transmitting and the
[RX] indicator lights green when the squelch is open.
e HEADPHONE JACK [PHONES]
Accepts headphones.
•Output power: 5 mW with an 8 Ω load.
•When headphones are connected, the internal speaker
or connected external speaker does not function.
r ELECTRONIC KEYER JACK [ELEC-KEY] (p.42)
Accepts a paddle to activate the internal electronic
keyer for CW operation.
•Selection between the internal electronic keyer, bug-key
and straight key operation can be made in keyer set
mode.(p. 42)
•A straight key jack is separately available on the rear
panel. See [KEY] on p.12.
•Keyer polar ity (dot and dash) can be reversed in keyer
set mode.(p. 42)
•4-channel memory keyer is available for your convenience.(p. 43)
t MICROPHONE CONNECTOR [MIC]
Accepts the supplied or optional microphone.
•See p.81 for appropriate microphones.
•See p.9 for microphone connector information.
y AF CONTROL [AF] (inner control)
Varies the audio output level from the speaker.
u MIC GAIN CONTROL [MIC GAIN]
Adjusts microphone input gain.
•The transmit audio tone in SSB mode can be adjusted
in set mode.(p. 65)
✔
How to set the microphone gain.
Set the [MIC] control so that the ALC meter sometimes
swings during normal voice transmission in SSB mode.
MIC GAIN
Recommended level for
an Icom microphone
IncreasesDecreases
AF RF/SQL
No audio output
Max. audio output
Decreases Increases
(dot)
(com)
(dash)
2
2
PANEL DESCRIPTION
TIMER
POWER
TRANSMIT
PHONES
ELEC-KEY
MIC
TUNER MONITOR NB NR
AF BAL NRRF/SQL
MIC GAIN RF POWER COMP KEY SPEED BK-IN DELAY
F-1 F-2 F-3 F-4 F-5
HF/50MHz TRANSCEIVER
i756PRO
SSB
CW/RTTY
AM/FM FILTER EXIT
q
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t
!2!3!4!5!6
yi !1o
!0u
i RF GAIN CONTROL/SQUELCH CONTROL
[RF/SQL] (outer control)
Adjusts the RF gain and squelch threshold level.
The squelch removes noise output from the speaker
(closed condition) when no signal is received.
•The squelch is particularly effective for FM. It is also
available for other modes.
•12 to 1 o’clock position is recommended for any setting
of the [RF/SQL] control.
•The control can be set as ‘Auto’ (RF gain control in SSB,
CW and RTTY; squelch control in AM and FM) or
squelch control (RF gain is fixed at maximum) in set
mode as follows.(p.68)
•When setting as RF gain/squelch control
While rotating the RF gain control, noise may be
heard.This comes from the DSP unit and does not
indicate an equipment malfunction.
o RF POWER CONTROL [RF POWER]
Continuously varies the RF output power from minimum (5 W*) to maximum (100 W*).
*AM mode: 5 W to 40 W
!0 BALANCE CONTROL [BAL] (inner control; p.31)
Adjusts the audio output balance between main and
sub readout frequencies while in dualwatch.
!1 NOISE REDUCTION LEVEL CONTROL [NR]
(outer control; p.27)
Adjusts the noise reduction level when the noise reduction is in use.Set for maximum readability.
!2 NOISE REDUCTION SWITCH [NR] (p. 27)
Toggles the noise reduction ON and OFF.
!3 NOISE BLANKER SWITCH [NB] (p. 27)
Toggles the noise blanker ON and OFF.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.
!4 S/RF METER (p. 36)
Shows the signal strength while receiving. Shows
the relative output power, SWR, ALC or compression levels while transmitting.
!5 MONITOR SWITCH [MONITOR] (p. 35)
Monitors your transmitted IF signal.
•The CW sidetone functions when [MONITOR] is OFF in
CW mode.
!6 ANTENNA TUNER SWITCH [TUNER] (p. 48)
➥Turns the antenna tuner ON and OFF (bypass)
when pushed momentarily.
➥Starts to tune the antenna manually when
pushed for 2 sec.
•When the tuner cannot tune the antenna, the tuning
circuit is bypassed automatically after 20 sec.
Noise blanker OFF Noise blanker ON
NB NB
Noise reduction OFF Noise reduction ON
NR NR
BAL NR
Decreases
OFF
Increases
BAL NR
Increases main
readout gain
Increases sub
readout gain
RF POWER
IncreasesDecreases
MODE
SSB, CW
RTTY
AM, FM
AUTO
RF GAIN
SQL
SQL
SET MODE SETTING
SQL
SQL
RF GAIN + SQL
RF GAIN + SQL
RF GAIN + SQL
Recommended level
Minimum RF gain
Adjustable
range
RF gain
adjustable
range
Maximum
RF gain
Maximum
RF gain
Squelch is
open.
S-meter
squelch
S-meter squelch
threshold
Noise squelch
threshold
(FM mode)
Shallow Deep
S-meter
squelch
Noise squelch (FM mode)
Noise squelch (FM mode)
Squelch is
open.
3
2
PANEL DESCRIPTION
•When functioning as RF gain control
(Squelch is fixed open;SSB, CW, RTTY only)
•When functioning as squelch control
(RF gain is fixed at maximum.)
4
2
PANEL DESCRIPTION
NB NR
BAL NR
COMP KEY SPEED BK-IN DELAY
LOCKTX
RX
TWIN PBT
CW PITCH
F-1 F-2 F-3 F-4 F-5
SPEECH LOCK
RIT/ TX
TXRIT CLEAR
SPLIT
MP-W MP-R
DUAL
WATCH
VFO/
MEMO
MAIN/
SUB
CHANGE
1.813.527
3
10414518
6
21724828
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F-INP
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MW
M-CL
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XFC
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i756PRO
PBT CLR NOTCH
NOTCH
SSB
CW/RTTY
AM/FM FILTER EXIT
@6@7
@0!9!8!7 @1 @4@3@2 @5
@8@9
■ Front panel (continued)
!7 COMPRESSION LEVEL CONTROL [COMP]
(p.37)
Adjusts the speech compression level in SSB.
!8 ELECTRONIC CW KEYER SPEED CONTROL
[KEY SPEED] (p.42)
Adjusts the internal electronic CW keyer’s speed.
•6 wpm (min.) to 60 wpm (max.) can be set.
!9 SEMI BREAK-IN DELAY CONTROL
[BK-IN DELAY]
Adjusts the transmit-to-receive switching dela y time
for CW semi break-in operation.
@0 MODE SWITCHES
Selects the desired mode.(p.26)
•Announces the selected mode when an optional UT-102
is installed. (pgs.71, 73)
➥Selects USB and LSB mode alternately.
➥Toggles SSB and SSB data mode (USB-
D, LSB-D) when pushed for 2 sec.
➥Selects CW and RTTY mode alternately.
➥Toggles CW and CW-R (CW reverse)
mode when pushed for 2 sec. in CW
mode.
➥Toggles RTTY and RTTY-R (RTTY re-
verse) mode when pushed for 2 sec. in
RTTY mode.
➥Selects AM and FM mode alternately.
➥Toggles AM/FM and AM/FM data mode
(AM-D, FM-D) when pushed for 2 sec.
@1 LCD FUNCTION SWITCHES [F-1]–[F-5]
Push to select the function indicated in the LCD display above these switches.
•Functions vary depending on the operating condition.
@2 FILTER SWITCH [FILTER]
➥Selects one of 3 IF filter settings.
➥Enters the filter set mode when pushed for 2 sec.
@3 EXIT SWITCH [EXIT]
Exits from a set mode, etc.when pushed.
@4 SPEECH SWITCH [SPEECH] (pgs. 71, 73)
Announces the selected readout frequency when
an optional UT-102 is installed.
@5 TUNING DIAL (p. 24)
Changes the displayed frequency, selects set mode
items, etc.
@6 MAIN/SUB SWITCH [MAIN/SUB]
Selects the main or sub readout for access.
•The sub readout frequency is displayed in outline or
mesh font.The sub readout functions only during split
operation or dualwatch.
@7 VFO/MEMORY SWITCH [VFO/MEMO]
➥Toggles the selected readout operating mode be-
tween the VFO mode and memory mode when
pushed. (pgs. 23, 50)
➥Transfers the memory contents to VFO when
pushed for 2 sec.(p.53)
AM/FM
CW/RTTY
CW/RTTY
SSB
BK-IN DELAY
Short delay for
high speed keying
(2 dot)
Long delay for
slow speed keying
(13 dot)
Slow Fast
KEY SPEED
COMP
Compression
level decreases
Compression
level increases
5
2
PANEL DESCRIPTION
✔
What is the AGC?
The AGC controls receiver gain to produce a constant audio
output level, e ven when the received signal strength is varied
by fading, etc. Select “FAST” for tuning and select “MID” or
“SLOW”depending on the receiving condition.
➥Turns the VOX function ON and OFF
when pushed in non-CW modes.(p.35)
➥Enters the VOX set mode when pushed
for 2 sec.in non-CW modes.(p. 35)
✔
What is the VOX function?
The VOX function (voice operated transmission) starts transmission without pushing the transmit switch or PTT switch
when you speak into the microphone;then, automatically returns to receive when you stop speaking.
➥Selects semi break-in, full break-in oper-
ation, or turns the break-in operation
OFF when pushed in CW mode.
✔
What is the break-in function?
The break-in function toggles transmit and receive with CW
keying. Full break-in (QSK) can monitor the receive signal
during keying.
➥Turns the RTTY filter ON and OFF in
RTTY mode.(p. 28)
•When the RTTY filter is turned ON, [TWIN
PBT] functions as the IF shift control.
➥Enters the RTTY filter set mode when
pushed for 2 sec.in RTTY mode.(p. 28)
✔
What is the IF shift?
The IF shift function electronically changes the center of the
IF (Intermediate Frequency) passband frequency to reject interference.Only the inner control of [TWIN PBT] can be used
for the IF shift control.
➥Turns the speech compressor ON and
OFF in SSB mode.(p.37)
➥Toggles the narrow, middle or wide tr ans-
mit filter when pushed for 2 sec.
✔
What is the speech compressor?
The speech compressor compresses the transmitter audio
input to increase the average audio output level. Therefore,
talk power is increased.This function is effective for long distance communication or when propagation conditions are
poor.
➥Turns the 1⁄4 function ON and OFF in CW
and RTTY modes.(p. 25)
•1⁄4 function sets dial rotation to 1⁄4 of normal
for fine tuning.
➥Toggles the tone encoder, tone squelch
function and no tone operation when
pushed in FM mode.(pgs.46, 47)
➥Enters the tone set mode when pushed
for 2 sec.in FM mode.(pgs. 46, 47)
TONETONE
1/41/4
OFFOFF
COMPCOMP
OFFOFF
WIDEWIDE
RTTYRTTY
FILFIL
OFFOFF
BK-INBK-IN
OFFOFF
VOXVOX
OFFOFF
@8 MAIN/SUB CHANGE SWITCH [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.
32)
➥Equalizes the sub readout frequency to the main
readout frequency when pushed for 2 sec.
@9 MULTI-FUNCTION SWITCHES
Push to select the functions indicated in the LCD
display to the right of these switches.
•Functions vary depending on the operating condition.
➥Toggles the antenna connector selection
between ANT1/R and ANT2/R when
pushed. (p.45)
➥Toggles the [RX ANT] (receive antenna)
ON and OFF when pushed for 2 sec.
When a transverter is in use, this [ANT]
does not function and ‘TRV’ appears.
➥Selects RF power (Po), ALC, SWR or
COMP metering during transmit. (p. 36)
➥Toggles the multi-function digital meter
ON and OFF when pushed for 2 sec.
➥Selects one of 2 receive RF preamps or
bypasses them.
•“P. AMP1” activates 10 dB preamp for HF all
bands.
•“P. AMP2” activates 16 dB high-gain preamp
for 21 MHz band and above.
✔
What is the preamp?
The preamp amplifies received signals in the front end circuit to improve the S/N ratio and sensitivity. Select “P. AMP1”
or “P. AMP2” when receiving weak signals.
➥Selects 6 dB, 12 dB or 18 dB attenuator,
or bypasses them.
✔
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.
➥Activates or selects fast, middle or slow
AGC time constant when pushed.
•“FAST”is only available for FM mode.
➥Enters the AGC set mode when pushed
for 2 sec.
AGC time constant can be set between 0.1 to 8.0
sec. (depends on mode), or turned OFF. While
“OFF” is selected, the S-meter does not function.
AGCAGC
MIDMID
ATTATT
OFFOFF
P.AMPP.AMP
OFFOFF
METERMETER
PoPo
ANTANT
1
6
2
PANEL DESCRIPTION
@8 LOCK SWITCH [LOCK] (p. 45)
Turns the dial lock function ON and OFF.
@9 RIT/∂∂TX CONTROL [RIT/∂∂TX] (p.34)
Shifts the receive and/or transmit frequency without
changing the transmit and/or receive frequency
while the RIT and/or ∂TX functions are ON.
•Rotate the control clockwise to increase the frequency,
or rotate the control counterclockwise to decrease the
frequency.
•The shift frequency range is ±9.999 kHz in 1 Hz steps
(or ±9.99 kHz in 10 Hz steps).
#0 RIT SWITCH [RIT] (p. 34)
➥Turns the RIT function ON and OFF when
pushed.
•Use the [RIT/∂TX] control to vary the RIT frequency.
➥Adds the RIT shift frequency to the operating fre-
quency when pushed for 2 sec.
✔
What is the RIT function?
The RIT (Receiver Incremental Tuning) shifts the receive frequency without shifting the transmit frequency.
This is useful for fine tuning stations calling you on an off-frequency or when you prefer to listen to slightly differentsounding voice characteristics, etc.
#1
∂∂
TX SWITCH [∂∂TX] (p.34)
➥Turns the ∂TX function ON and OFF when
pushed.
•Use the [RIT/∂TX] control to vary the ∂TX frequency.
➥Adds the ∂TX shift frequency to the operating fre-
quency when pushed for 2 sec.
✔
What is the ∂∂TX function?
The ∂TX shifts the transmit frequency without shifting the receive frequency. This is useful for simple split frequency operation in CW, etc.
#2 CLEAR SWITCH [CLEAR] (p. 34)
Clears the RIT/∂TX shift frequency when pushed
for 2 sec.
#3 CW PITCH CONTROL [CW PITCH]
(outer control; p.29)
Shifts the received CW audio pitch and monitored
CW audio pitch without changing the operating frequency.
#4 MANUAL NOTCH FILTER CONTROL [NOTCH]
(inner control; p.27)
Var ies the peak frequency of the manual notch fil-
ter to pick out a receive signal from interference
while the manual notch function is ON.
•Notch filter center frequency:
SSB : 0 Hz to 5100 Hz
CW :–900 Hz + CW pitch freq. to 4200 Hz + CW
pitch freq.
AM : –5100 Hz to 5100 Hz
NOTCH
CW PITCH
Lower frequency Higher frequency
Approx. 300 Hz
Approx. 900 Hz
Lower frequency Higher frequency
NOTCH
CW PITCH
RIT/∂TX
Low shift High shift
NB NR
BAL NR
COMP KEY SPEED BK-IN DELAY
LOCKTX
RX
TWIN PBT
CW PITCH
F-1 F-2 F-3 F-4 F-5
SPEECH LOCK
RIT/ TX
TXRIT CLEAR
SPLIT
MP-W MP-R
DUAL
WATCH
VFO/
MEMO
MAIN/
SUB
CHANGE
1.813.527
3
10414518
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21724828
9
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F-INP
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M-CL
TS
XFC
CEIVER
i756PRO
PBT CLR NOTCH
NOTCH
SSB
CW/RTTY
AM/FM FILTER EXIT
$5 $4 $3
#9
#8
#7
#2
#4
#3
#1
#6
#5
#0
@9
@8
$0$1$2
■ Front panel (continued)
7
2
PANEL DESCRIPTION
#5 PBT CLEAR SWITCH [PBT CLR] (p. 26)
Clears the PBT settings when pushed for 2 sec.
•The [PBT CLR] indicator appears when PBT is in use.
#6 NOTCH SWITCH [NOTCH] (p. 27)
➥Toggles the notch function between auto, manual
and OFF in SSB and AM modes.
➥Turns the manual notch function ON and OFF
when pushed in CW mode.
➥Turns the auto notch function ON and OFF when
pushed in FM mode.
•“AN” appears when auto notch is in use.
•“MN” appears when manual notch is in use.
✔
What is the notch function?
The notch function eliminates unwanted CW or AM carrier
tones while preserving the desired signal’s audio response.
The filtering frequency is adjusted to effectively eliminate unwanted tones via the DSP circuit.
#7 PASSBAND TUNING CONTROLS [TWIN PBT]
Adjust the receiver’s “passband width” of the DSP
filter.(p. 26)
•Passband width and shift frequency are displa yed in the
LCD.
•Push [PBT CLR] for 2 sec.to clear the settings when not
in use.
•Var iable range is set to the half of the IF filter passband
width. 25 Hz steps and 50 Hz steps are available.
•These controls function as an IF shift control while in AM
mode and when the RTTY filter is turned ON. Only the
inner control may function in this case.
✔
What is the PBT control?
General PBT function electronically narrows the IF passband
width to reject interference.This transceiver uses the DSP
circuit for the PBT function.
#8 LOCK INDICATOR [LOCK] (p.45)
Lights when the dial lock function is activated.
#9 MEMO PAD-READ SWITCH [MP-R] (p. 55)
Each push calls up a frequency and operating
mode in a memo pad. The 5 (or 10) most recently
programmed frequencies and operating modes can
be recalled, starting from the most recent.
•The memo pad capacity can be expanded from 5 to 10
in set mode for your convenience. (p.71)
$0 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. 24)
•Icom’s triple band stacking register memor izes 3 frequencies in each band.
➥After pushing [F-INP], enters a keyed frequency
or memory channel. Pushing [(F-INP)ENT] or
[Y]/[Z] is necessary at the end. (pgs. 24, 50)
•e.g. to enter 14.195 MHz, push [F-INP] [1] [4] [•] [1]
[9] [5] [(F-INP)ENT].
$1 MEMO PAD-WRITE SWITCH [MP-W] (p. 55)
Programs the selected readout frequency and operating mode into a memo pad.
•The 5 most recent entries remain in memo pads.
•The transmit frequency is programmed when pushed to-
gether with [XFC].
•The memo pad capacity can be expanded from 5 to 10
in set mode for your convenience. (p.71)
$2 DUALWATCH SWITCH [DUALWATCH] (p. 31)
➥Turns the dualwatch function ON and OFF when
pushed.
➥Turns the dualwatch function ON and equalizes
the sub readout frequency to the main readout
when pushed for 2 sec. (Quick dualwatch function)
•The quick dualwatch function can be turned OFF
using set mode.(p. 68)
$3 SPLIT SWITCH [SPLIT] (p. 32)
➥Turns the split function ON and OFF when
pushed.
➥Turns the split function ON, equalizes the sub
readout frequency to the main readout and sets
the sub readout for frequency input when pushed
for 2 sec.in non-FM modes. (Quick split function)
•The offset frequency is shifted from the main readout
frequency in FM mode.(pgs. 46, 69)
•The quick split function can be turned OFF using set
mode.(p. 68)
➥Turns the split function ON and shifts the sub
readout frequency after inputting an offset (±4
MHz in 1 kHz steps).
$4 RECEIVE INDICATOR [RX]
Lights green while receiving a signal and when the
squelch is open.
$5 TRANSMIT INDICATOR [TX]
Lights red while transmitting.
PBT1
PBT2
TWIN PBT
Low cut High cutCenter
TWIN PBT TWIN PBT TWIN PBT
– +
NOTCHNOTCH
Notch OFF Notch ON
8
2
PANEL DESCRIPTION
$6 LCD FUNCTION DISPLAY (See p.10 for details.)
Shows the operating frequency, function switch
menus, spectrum screen, memory channel screen,
set mode settings, etc.
$7 MEMORY UP/DOWN SWITCHES [YY]/[ZZ] (p.50)
➥Select the memory channel number for the se-
lected readout.
•Memory channels can be selected both in VFO and
memory modes.
➥Select the desired memory channel directly after
pushing [F-INP] and a memory channel number.
$8 MEMORY WRITE SWITCH [MW] (p.52)
Stores the selected readout frequency and operating mode into the displayed memory channel when
pushed for 2 sec.
•This function is available both in VFO and memory
modes.
$9 MEMORY CLEAR SWITCH [M-CL] (p.54)
Clears the selected readout memory channel contents when pushed for 2 sec.in memory mode.
•The channel becomes a blank channel.
•This switch does not function in VFO mode.
%0 QUICK TUNING SWITCH [TS] (p.25)
➥Turns the quick tuning step ON and OFF.
•While the quick tuning indicator is displayed, the frequency can be changed in programmed kHz steps.
•0.1, 1, 5, 9, 10, 12.5, 20 and 25 kHz quick tuning
steps are available.
➥While the quick tuning step is OFF, turns the 1 Hz
step ON and OFF when pushed for 2 sec.
•1 Hz indications appear in both readouts and the frequency can be changed in 1 Hz steps.
➥While the quick tuning step is ON, enters the
quick tuning step set mode when pushed for 2
sec.
%1 TRANSMIT FREQUENCY CHECK SWITCH
[XFC]
Monitors the transmit frequency when pushed and
held when the split frequency function is ON.
•While pushing this switch, the transmit frequency can be
changed with the tuning dial, keypad, memo pad or the
[Y]/[Z] switches.
•When the split lock function is turned ON, pushing [XFC]
cancels the dial lock function.(p. 69)
ANT
1
METER
Po
BWBW
2.4k2.4k
SFTSFT
0
FIL2FIL2
qw:pp
TXTX
CWCW
qr≥qpp≥pp
21.076.5021.076.50
VFOVFO
USBUSB
1
Quick tuning indicator
NB NR
BAL NR
COMP KEY SPEED BK-IN DELAY
LOCKTX
RX
TWIN PBT
CW PITCH
F-1 F-2 F-3 F-4 F-5
SPEECH LOCK
RIT/ TX
TXRIT CLEAR
SPLIT
MP-W MP-R
DUAL
WATCH
VFO/
MEMO
MAIN/
SUB
CHANGE
1.813.527
3
10414518
6
21724828
9
GENE
•
50
0
F-INP
ENT
Y
Z
MW
M-CL
TS
XFC
EIVER
i756PRO
PBT CLR NOTCH
NOTCH
SSB
CW/RTTY
AM/FM FILTER EXIT
$7 $8 $9 %0 %1
$6
■ Front panel (continued)
9
2
PANEL DESCRIPTION
■ Microphone (HM-36)
q UP/DOWN SWITCHES [UP]/[DN]
Change the selected readout frequency or memory
channel.
•Continuous pushing changes the frequency or memory
channel number continuously.
•While pushing [XFC], the transmit readout frequency can
be controlled while in spilt frequency operation.
•The [UP]/[DN] switch can simulate a key paddle. Preset
in the keyer set mode. (p.42)
w PTT SWITCH
Push and hold to transmit; release to receive.
q
w
•MICROPHONE CONNECTOR
(Front panel view)
•HM-36 SCHEMATIC DIAGRAM
CAUTION:
DO NOT short pin 2 to ground as this
can damage the internal 8 V regulator.
+
+
q
w
ert
y
u
i
4700p
4700p
10µ
0.33µ
MICROPHONE
MIC
ELEMENT
2k
470
DOWN UP
PTT
RECEIVE
TRANSMIT
MICROPHONE CABLE MICROPHONE PLUG
y GND (PTT ground)
t PTT
r Main readout squelch switch
q Microphone input
w +8 V DC output
e Frequency up/down
u GND
(Microphone ground)
i Main readout AF output
(varies with [AF]/[BAL])
Max. 10 mA
Ground
Ground through 470 Ω
“LOW” level
“HIGH” level
+8 V DC output
Frequency up
Frequency down
Squelch open
Squelch closed
[MIC]
PIN NO.
w
e
r
FUNCTION DESCRIPTION
q TX INDICATOR
Indicates the frequency readout for transmit.
w VFO/MEMORY CHANNEL INDICATOR
(pgs.23, 50)
Indicates the VFO mode or selected memory channel number.
e SELECT MEMORY CHANNEL INDICATOR
(p.59)
Indicates the displayed memory channel is set as a
select memory channel.
r MULTI-FUNCTION SWITCH GUIDE
Indicates the function of the multi-function switches.
t LCD FUNCTION SWITCH GUIDE
Indicates the function of the LCD function switches
([F-1]–[F-5]).
y MULTI-FUNCTION SCREEN (p. 11)
Shows the screens for the multi-function digital
meter, spectrum scope, voice recorder, memory
channel, scan, memory keyer, RTTY decoder, IF fil-
ter selection or set modes, etc.
u MEMORY CHANNEL READOUTS (p.50)
➥Show the selected memory channel contents in
VFO mode.
➥Show the VFO contents in memory mode.
i FREQUENCY READOUTS (p. 24)
Show the operating frequency.
•Outline characters are used for non-accessing readout.
o CLOCK READOUT (p. 62)
Shows the current time.
!0 RTTY TUNING INDICAT OR (p.41)
Shows the tuning level in RTTY mode.
!1 QUICK TUNING INDICAT OR (p.25)
Appears when the quick tuning step function is in
use.
!2 PASSBAND WIDTH INDICA TOR (p. 26)
Graphically displays the passband width for twin
PBT operation and center frequency for IF shift operation.
!3 IF FILTER INDICATOR (p. 29)
Shows the selected IF filter number.
!4 SHIFT FREQUENCY INDICATOR (p. 26)
Shows the shift frequency of the IF filter.
!5 MODE INDICATOR (p.26)
Shows the selected mode.
!6 BAND WIDTH INDICA TOR (p.29)
Shows the passband width of the IF filter.
10
2
PANEL DESCRIPTION
ANTANT
1
METERMETER
PoPo
P.AMPP.AMP
1
ATTATT
OFFOFF
VOXVOX
OFFOFF
COMPCOMP
OFFOFF
WIDEWIDE
AGCAGC
MIDMID
SUBSUB
MARKERMARKER
+12.5k+12.5k
-12.5k-12.5k
SPECTRUM SCOPESPECTRUM SCOPE
SPANSPAN
ATTATT
MARKERMARKER
HOLDHOLD
SETSET
BWBW
2.4k2.4k
SFTSFT
0
USBUSB
qw:pp
VFOVFO 21.085.0021.085.00TXCWCW
FIL2
qr≥qqy≥pp
qr≥qpp≥pp
56ß
USB
1ß 21.085.0021.085.00 CWCW
VFO
FIL2FIL2
GridGrid
10k10k
10dB10dB
t
i
i
!6 !4!5 !2!3 !1 !0 o
y
u
u
r
q
w
e
w
■ LCD display
11
2
PANEL DESCRIPTION
ANTANT
1
METERMETER
PoPo
P.AMPP.AMP
1
ATTATT
OFFOFF
VOXVOX
OFFOFF
COMPCOMP
OFFOFF
WIDEWIDE
SCOPESCOPE
VOICEVOICE
MEMORYMEMORY
SCANSCAN
SETSET
BWBW
2.4k2.4k
SFTSFT
0
VFOVFO
FIL2FIL2
USBUSB
qw:pp
AGCAGC
MIDMID
1
TXTX
VFOVFO
1
USBUSB
CWCW
CWCW
FIL2FIL2
qr≥qpp≥pp
qr≥qpp≥pp
--. ---. ----. ---. --
--. ---. ----. ---. --
VOXVOX
OFFOFF
COMPCOMP
OFFOFF
WIDEWIDE
SPANSPAN
MARKERMARKER
HOLDHOLD
SETSET
AGCAGC
MIDMID
GridGrid
2.5k2.5k
10dB10dB
+12. 5k+12. 5k
-12. 5k-12. 5k
SPECTRUM SCOPESPECTRUM SCOPE
PLAYPLAY
MIC RECMIC REC
TX LEV.TX LEV.
SETSET
VOXVOX
OFFOFF
COMPCOMP
OFFOFF
WIDEWIDE
AGCAGC
MIDMID
VOICE RECORDERVOICE RECORDER
SENDSEND
EDITEDIT
001001
CW KEYCW KEY
BK-INBK-IN
OFFOFF
1/41/4
OFFOFF
AGCAGC
MIDMID
MEMORY KEYERMEMORY KEYER
ROLLROLL
SETSET
SELECTSELECT
NAMENAME
WIDEWIDE
VOXVOX
OFFOFF
COMPCOMP
OFFOFF
WIDEWIDE
RTTYRTTY
FILFIL
ONON
AGCAGC
MIDMID
MEMORYMEMORY
LEVELLEVEL
DISPDISP
TIMETIME
OTHERSOTHERS
VOXVOX
OFFOFF
COMPCOMP
OFFOFF
WIDEWIDE
AGCAGC
MIDMID
SET MODESET MODE
F-1
F-1
F-2
F-2
F-2
F-2
F-3
F-3
F-4
F-4
F-4
F-5
F-5
VOXVOX
OFFOFF
COMPCOMP
OFFOFF
WIDEWIDE
MEMOMEMO
∂
F
SELECTSELECT
∂
F SPANF SPAN
SETSET
AGCAGC
MIDMID
SCANSCAN
VOXVOX
OFFOFF
COMPCOMP
OFFOFF
WIDEWIDE
PROGPROG
∂
F
FINEFINE
∂
F SPANF SPAN
SETSET
AGCAGC
MIDMID
SCANSCAN
ATTATT
HOLDHOLD
CLRCLR
WIDEWIDE
ADJADJ
1/41/4
OFFOFF
AGCAGC
MIDMID
•Spectrum scope screen (p. 44)
•Voice recorder screen (p. 38)
•Memory channel screen (p. 51)
•Memory channel scan screen (p. 58) •RTTY decoder screen (p. 41)
•Programmed scan screen (p. 57)
•Set mode screen (p. 64)
•Memory keyer screen (p. 42)
•Start up screen
9999 --.---.----.---.-- ------------ ------
P1P1 0 0.500.000.500.00 LSBLSB FL2 SCAN EDGEFL2 SCAN EDGE
P2P2 29.999.9929.999.99 USBUSB FL2 SCAN EDGEFL2 SCAN EDGE
1 --.---.----.---.-- ------------ ------
2 --.---.----.---.-- ------------ ------
3 --.---.----.---.-- ------------ ------
4 --.---.----.---.-- ------------ ------
SETSET MODEMODE MENUMENU
LEVELLEVELTXTX Tone,Monitor,SideTone,Monitor,Side ToneToneetcetc
DISPDISPBright,Contrast,Style,FontBright,Contrast,Style,Fontetcetc
TIMETIMEClock/TimerClock/Timer
OTHERSOTHERSOtherOtherSetSetModeMode
MEMORY KEYER MENUMEMORY KEYER MENU
SENDSENDMax.54Max.54CharactersCharacters x 4ch4ch
EDITEDITMemoryMemoryEditorEditor
001001001001 StyleStyle ContestContestNumberNumber
CWCW KEYKEY Memo-key,Elec-key,CWMemo-key,Elec-key,CWWaveWaveFormFormSetSet
******** RTTYRTTY DecodeDecodeMonitorMonitor********
45bps45bpsBAUDOTBAUDOTMark=2125,Mark=2125,Shift=170Shift=170
UnShiftUnShiftOnOnSpaceSpace supportsupport (SET-OTHERS)(SET-OTHERS)
NewNewLineLineCodeCodeselectableselectable (SET-OTHERS)(SET-OTHERS)
IfIfRTTY-FILRTTY-FILisisOFF,OFF,PleasePleaseturnturnON.ON.
----------------------------------------------------------------------------------------
∂ F SpanSpan: ±±10kHz10kHz
ProgrammedProgrammed P1:P1:0.500.00MHz0.500.00MHz
scanscanedgesedges P2:P2:29.999.99MHz29.999.99MHz
∂ F SpanSpan: ±±10kHz10kHz
ProgrammedProgrammed P1:P1:0.500.00MHz0.500.00MHz
scanscanedgesedges P2:P2:29.999.99MHz29.999.99MHz
VOICEVOICERECORDERRECORDER MENUMENU
PLAYPLAYTXTX 15sec.15sec. x 4ch4ch
RXRX 15sec.15sec. x 4ch4ch
MICMICRECRECMic Record/RecordMic Record/Recordcheckcheck
TXTX LEV.LEV.RecorderRecorderOutputOutputAdjustAdjust
SETSETAutoAuto MonitorMonitorSETSET
THRESHOLDTHRESHOLD 9
RTTY DECODERTTY DECODE
■ Screen menu arrangement
The following screens can be selected from the start
up screen. Choose the desired screen using the following chart.
Pushing [EXIT] one or more times returns to the star t
up screen. See p.64 for set mode arrangement.
■ Rear panel
q RECEIVE ANTENNA CONNECTOR [RX ANT]
(p.16)
Connects a 50 Ω general coverage antenna with an
RCA connector.
w TRANSVERTER JACK [XVERT] (p. 19)
External transverter input/output jack. Activated by
voltage applied to [ACC(2)] pin 6.
e TUNER CONTROL SOCKET [TUNER] (p. 16)
Accepts the control cable from an optional AH-4
HF/50 MHz AUTOMATIC ANTENNA TUNER or AH-3
HF AUTOMATIC ANTENNA TUNER.
r ACCESSORY SOCKET 1 [ACC(1)]
t ACCESSORY SOCKET 2 [ACC(2)]
Enable connection of external equipment such as a
linear amplifier, an automatic antenna selector/
tuner, TNC for data communications, etc.
•See p.13 for socket information.
y STRAIGHT KEY JACK [KEY] (p.15)
Accepts a straight key or external electronic keyer
with 1⁄4 inch standard plug.
•[ELEC-KEY] on the front panel can be used for a str aight
key or external electronic keyer. Deactivate the internal
electronic keyer in keyer set mode. (p.42)
If you use an external electronic ke y er, make sure
the voltage retained by the keyer is less than 0.4
V when the key is ON.
u CI-V REMOTE CONTROL JACK [REMOTE]
(p.16)
➥Designed for use with a personal computer f or re-
mote control of transceiver functions.
➥Used for transceive operation with another Icom
CI-V transceiver or receiver.
i EXTERNAL SPEAKER JACK [EXT SP]
(pgs.16, 81)
Accepts an 4–8 Ω speaker.
o ALC INPUT JACK [ALC] (p.19)
Connects to the ALC output jack of a non-Icom linear amplifier.
!0 SEND CONTROL JACK [SEND] (p. 19)
Goes to ground while transmitting to control external equipment such as a linear amplifier.
•Max.control level: 16 V DC/2 A
!1 DC POWER SOCKET [DC 13.8V] (p.15)
Accepts 13.8 V DC through the supplied DC power
cable (OPC-025D).
Rear panel
view
+_
(+)
(_)
q w!0
!1
ertyuio
!4 !3 !2
12
2
PANEL DESCRIPTION
!2 ANTENNA CONNECTOR 1 [ANT1]
!3 ANTENNA CONNECTOR 2 [ANT2] (pgs. 14, 15)
Accept a 50 Ω antenna with a PL-259 connector.
When using an optional AH-4 HF/50 MHz AUTO-
MATIC ANTENNA TUNER
or AH-3 HF AUTOMATIC AN-
TENNA TUNER
, connect it to the [ANT1] connector.
The internal antenna tuner activates for [ANT2] and
deactivates for [ANT1] when connecting the AH-4 or
AH-3.
DACC SOCKETS
!4 GROUND TERMINAL [GND] (pgs.14, 15)
Connect this terminal to a ground to prevent electrical shocks, TVI, BCI and other problems.
13
2
PANEL DESCRIPTION
ACC(1) PIN NO.
PIN NAME
DESCRIPTION SPECIFICATIONS
1
RTTY Controls RTTY keying.
“HIGH” level : More than 2.4 V
“LOW” level : Less than 0.6 V
Output current : Less than 2 mA
2 GND Connects to ground. Connected in parallel with ACC(2) pin 2.
3 SEND
Input/output pin.
Goes to ground when transmitting.
When grounded, transmits.
Ground level : –0.5 V to 0.8 V
Output current : Less than 20 mA
Input current (Tx) : Less than 200 mA
Connected in parallel with ACC(2) pin 3.
4 MOD
Modulator input.
Connects to a modulator.
Input impedance : 10 kΩ
Input level : Approx. 100 mV rms
5 AF
AF detector output.
Fixed, regardless of [AF] position in
default settings. (see notes below)
Output impedance : 4.7 kΩ
Output level : 100 to 300 mV rms
6 SQLS
Squelch output.
Goes to ground when squelch
opens.
Squelch open : Less than 0.3 V/5 mA
Squelch closed : More than 6.0 V/100 µA
7 13.8 V 13.8 V output when power is ON.
Output current : Max. 1 A
Connected in parallel with ACC(2) pin 7.
8 ALC ALC voltage input.
Control voltage : –4 to 0 V
Input impedance : More than 10 kΩ
Connected in parallel with ACC(2) pin 5.
If the CW side tone level limit or beep le vel limit is in
use, the CW side tone or beep tone decreases from
the fixed le v el when the [AF] control is rotated above
a specified level, respectively.(p. 65)
2
4
5
1
3
8
6
7
Rear panel
view
ACC(2) PIN NO.
2
4
5
1
3
6
7
Rear panel
view
1
2 GND Same as ACC(1) pin 2.
3 SEND Same as ACC(1) pin 3.
4 BAND
5 ALC Same as ACC(1) pin 8.
6 TRV
7 13.8 V Same as ACC(1) pin 7.
PIN NAME
8 V Regulated 8 V output.
Band voltage output.
(Varies with amateur band)
Activates [XVERT] input/output
when “HIGH” voltage is applied.
DESCRIPTION SPECIFICATIONS
Output voltage : 8 V ±0.3 V
Output current : Less than 10 mA
Output voltage : 0 to 8.0 V
Input impedance : More than 10 kΩ
Input voltage : 2 to 13.8 V
3
14
INSTALLATION AND CONNECTIONS
■ Unpacking
After unpacking, immediately report any damage to the
delivering carrier or dealer.Keep the shipping cartons.
For a description and a diagram of accessory equipment included with the IC-756PRO, see ‘Supplied ac-
cessories’ on p.1 of this manual.
■ Selecting a location
Select a location for the transceiver that allows adequate air circulation, free from extreme heat, cold, or
vibrations, and away from TV sets, TV antenna elements, radios and other electro-magnetic sources.
The base of the transceiver has an adjustable stand for
desktop use. Set the stand to one of two angles depending on your operating conditions.
■ Grounding
To prevent electrical shock, television interference
(TVI), broadcast interference (BCI) and other problems, ground the transceiver through the GROUND
terminal on the rear panel.
For best results, connect a heavy gauge wire or strap
to a long earth-sunk copper rod. Make the distance between the [GND] terminal and ground as short as possible.
RWARNING: NEVER connect the [GND]
terminal to a gas or electric pipe, since the connection could cause an explosion or electric shock.
■ Antenna connection
For radio communications , the antenna is of critical importance, along with output power and sensitivity. Select antenna(s), such as a well-matched 50 Ω antenna,
and feedline.1.5:1 or better of Voltage Standing Wave
Ratio (VSWR) is recommended for your desired band.
Of course, the transmission line should be a coaxial
cable.
When using 1 antenna, use the [ANT1] connector.
CAUTION:Protect your transceiver from lightning
by using a lightning arrestor.
Antenna SWR
Each antenna is tuned for a specified frequency
range and SWR may be increased out-of-range.
When the SWR is higher than approx. 2.0:1, the
transceiver’s power drops to protect the final transis-
tor.In this case, an antenna tuner is useful to match
the transceiver and antenna. Low SWR allows full
power for transmitting even when using the antenna
tuner.The IC-756PRO has an SWR meter to monitor
the antenna SWR continuously.
PL-259 CONNECTOR INSTALLATION EXAMPLE
30 mm ≈9⁄8 in 10 mm ≈3⁄8 in 1–2 mm ≈1⁄16 in
q
Coupling ring
w
e
30 mm
10 mm (soft solder)
10 mm
Soft
solder
1–2 mm
solder solder
Slide the coupling ring
down. Strip the cable
jacket and soft solder.
Strip the cable as
shown at left. Soft
solder the center conductor.
Slide the connector
body on and solder it.
r
Screw the coupling
ring onto the
connector body.
15
3
INSTALLATION AND CONNECTIONS
TIMER
POWER
TRANSMIT
PHONES
ELEC-KEY
MIC
TUNER MONITOR NB NR
AF BAL NRRF/SQL
MIC GAIN RF POWER COMP KEY SPEED BK-IN DELAY
LOCKTX
RX
TWIN PBT
CW PITCH
F-1 F-2 F-3 F-4 F-5
SPEECH LOCK
RIT/ TX
TXRIT CLEAR
SPLIT
MP-W MP-R
DUAL
WATCH
VFO/
MEMO
MAIN/
SUB
CHANGE
1.813.527
3
10414518
6
21724828
9
GENE
•
50
0
F-INP
ENT
Y
Z
MW
M-CL
TS
XFC
HF/50MHz TRANSCEIVER
i756PRO
PBT CLR NOTCH
NOTCH
SSB
CW/RTTY
AM/FM FILTER EXIT
CW KEY
A straight key can be used
when the internal electronic
keyer is turned OFF in keyer
set mode. (p. 42)
MICROPHONES (p. 81)
SM-20HM-36
GROUND (p. 14)
Use the heaviest gauge wire
or strap available and make
the connection as short as
possible.
Grounding prevents electrical
shocks, TVI and other
problems.
ANTENNA 1, 2 (p. 14)
[Example]: ANT1 for 1.8–18 MHz bands
ANT2 for 21–50 MHz bands
DC POWER SUPPLY
STRAIGHT KEY
13.8 V DC
25 A
+_
■ Required connections
•Front panel
•Rear panel
16
3
INSTALLATION AND CONNECTIONS
TIMER
POWER
TRANSMIT
PHONES
ELEC-KEY
MIC
TUNER MONITOR NB NR
AF BAL NRRF/SQL
MIC GAIN RF POWER COMP KEY SPEED BK-IN DELAY
LOCKTX
RX
TWIN PBT
CW PITCH
F-1 F-2 F-3 F-4 F-5
SPEECH LOCK
RIT/ TX
TXRIT CLEAR
SPLIT
MP-W MP-R
DUAL
WATCH
VFO/
MEMO
MAIN/
SUB
CHANGE
1.813.527
3
10414518
6
21724828
9
GENE
•
50
0
F-INP
ENT
Y
Z
MW
M-CL
TS
XFC
HF/50MHz TRANSCEIVER
i756PRO
PBT CLR NOTCH
NOTCH
SSB
CW/RTTY
AM/FM FILTER EXIT
HEADPHONES
MIC
The AFSK modulation signal
can be input from [MIC]. (p. 21)
ANTENNA 1, 2 (pgs. 18–20)
Connects a linear amplifier,
antenna selector, etc.
EXTERNAL SPEAKER (p. 81)
ACC SOCKETS (p. 13)
RX ANTENNA
TRANSVERTER
(p. 19)
Connects a transverter
for V/UHF band use.
SP-20
AH-4, AH-3
(p. 20)
AH-2b
[REMOTE] (pgs. 12, 72)
Used for computer control and transceive operation.
[SEND], [ALC]
(p. 19)
Used for connecting a
non-Icom linear amplifier.
When using the AH-4 or AH3, it must be connected to
the [ANT1] connector.
■ Advanced connections
•Front panel
•Rear panel
17
3
INSTALLATION AND CONNECTIONS
■ Power supply connections
Use an optional DC power supply with a 25 A capacity
and above when operating the transceiver with AC
power. Refer to the diagrams below.
CAUTION: Before connecting the DC power
cable, check the following impor tant items. Make
sure:
•The [POWER] switch is OFF.
•Output voltage of the power source is 12–15 V
when you use a non-Icom power supply.
•DC power cable polarity is correct.
Red :positive + terminal
Black : negative _ terminal
CONNECTING A DC POWER SUPPLY
CONNECTING A VEHICLE BATTERY
NEVER connect to
a 24 V battery.
NOTE: Use terminals for
the cable connections.
AC outlet
AC cable
A DC power supply
13.8 V 25 A
Black_Red
+
30 A fuses
to DC power
socket
Supplied
DC power cable
Transceiver
Grommet
_ black
12 V
battery
+ red
Supplied
DC power cable
Crimp
Solder
18
3
INSTALLATION AND CONNECTIONS
■ Linear amplifier connections
Use the [ANT1] connector when connecting a linear
amplifier.
CONNECTING THE IC-PW1
Turn OFF the transceiver’s antenna tuner while tuning the IC-PW1’s tuner.
CONNECTING THE IC-4KL
Turn OFF the transceiver’s antenna tuner while tuning the IC-4KL’s tuner.
Remote control cable
ACC cable (supplied with the IC-PW1)
INPUT1
INPUT2
GND
ANT
To an
antenna
ACC-1
REMOTE
EXCITER
1 1&2
IC-PW1
AC outlet
(Non-European versions : 100–120/220–240 V
European version : 230 V)
(supplied with the IC-PW1)
Be sure to connect the cable
to the 7-pin ACC(2) jack.
Coaxial cable
(supplied with the IC-PW1)
Connect
Coaxial cable
(optional)
ANT2 ANT1 ACC(2) REMOTE
GND
Ground
[INPUT2]
if necessary.
IC-756PRO
(supplied with the IC-4KL)
ACC cable (supplied with the IC-4KL)
IC-4KL
Remote
controller
Remote control cable
ANT1
Transceiver
Coaxial cable
ACC(2)
Ground
To an
antenna
ACC
IC-4KL
(supplied with the IC-4KL)
AC outlet (220–240 V)
19
3
INSTALLATION AND CONNECTIONS
CONNECTING THE IC-2KL
CAUTION:
Set the transceiver output
power for 80 W max. with the
[RF POWER] control, otherwise, a protection circuit will
activate.
CONNECTING A NON-ICOM LINEAR AMPLIFIER
R WARNING:
Set the transceiver output power
and linear amplifier ALC output
level ref erring to the linear amplifier
instruction manual.
The ALC input level must be in the
range 0 V to –4 V, and the transceiver does not accept positive
voltage.Non-matched ALC and RF
power settings could cause a fire
or ruin the linear amplifier.
The specifications for the SEND relay are 16 V DC 2 A. If this
level is exceeded, a large external relay must be used.
When 2 to 13.8 V is applied to pin 6 of [ACC(2)], the
[XVERT] jack is activated for transverter operation
and the antenna connectors do not receive or transmit any signals.(p.13)
While receiving, the [XVERT] jack can be activ ated as
an input terminal from an external transverter.
While transmitting, the [XVERT] jack outputs signals
of the displayed frequency at –20 dBm (22 mV) as
signals for the external transverter.
Transverter jack
■ Transverter jack information
To an antenna
ANT
GND
ACC cable (supplied with the IC-2KL)
Coaxial cable (supplied with the IC-2KL)
IC-2KL
ANT1
Transceiver
To the IC-2KLPS
To an
antenna
RF OUTPUT RF INPUT
Non-Icom linear amplifier
ACC(2)ACC(1)
Ground
ALC
SEND
OPC-118 (sold separately)
50 Ω coaxial cable
ANT1
Transceiver
ALC SEND
20
3
INSTALLATION AND CONNECTIONS
■ External antenna selector or antenna tuner connections
CONNECTING THE EX-627
CONNECTING THE AH-4 or AH-3
CONNECTING THE IC-A T500 THROUGH THE IC-2KL
•The AH-4 and AH-3 must be connected to [ANT1].
•The AH-3 can be used for the HF bands only, although the [ANT1] con-
nector is used for both HF and 50 MHz operation.Use a coaxial antenna
switch when you operate the 50 MHz band with the AH-3 connected.
Coaxial cable (supplied with the EX-627)
ANT1
EX-627
ACC(2)
ACC cable
(supplied with
the EX-627)
Ground
Coaxial cable (from the AH-4 or AH-3)
ANT1
Transceiver
Control cable
Ground
AH-4 or AH-3
Long wire or optional AH-2b
To an
Coaxial cable
(supplied with
the IC-AT500)
antenna
ANT
GND
To the IC-2KLPSIC-AT500
Ground
ACC cable
(supplied with the IC-2KL)
ACC cable
(supplied with the
IC-AT500)
IC-2KL
Coaxial cable
(supplied with the IC-2KL)
ANT1
ACC(1) ACC(2)
OPC-118
Transceiver
(sold separately)
AF input
Ground (GND)
PTT
SQUELCH input*
RTTY keying
* Connect the SQUELCH line when required.
Terminal unit (TU) or
Terminal Node Controller (TNC)
[ACC(1)] socket
(Rear panel view)
1
2
3
4
5
6
7
8
AFSK output
AF input
Ground (GND)
Ground (GND)
PTT
SQUELCH input*
* Connect the SQUELCH line when required.
Terminal Node Controller (TNC)
or Scan converter
[ACC(1)] socket
(Rear panel view)
1
2
3
4
5
6
7
8
AF input
Ground (GND)
AFSK output
PTT
SQUELCH input*
* Connect the SQUELCH line when required.
Terminal Node Controller (TNC)
or Scan converter
[MIC] connector
(Front panel view)
1
2
345
678
21
3
INSTALLATION AND CONNECTIONS
■ FSK and AFSK (SSTV) connections
To connect a terminal unit, TNC or scan conver ter,
refer to the diagram below.
For RTTY operation:
Narrow filter settings may not pass RTTY signals.
Be sure to select the appropriate IF filter settings
corresponding to the signal width. (p.29)
FSK (RTTY) connection
Use RTTY mode for
operation
AFSK and SSTV connections
Use SSB or FM mode
for operation
AFSK and SSTV connections via microphone connector
Use SSB or FM mode
for operation
When connected to the [MIC] connector, [MIC
GAIN] and [AF] control adjustment is required.
4
22
FREQUENCY SETTING
■ When first applying power (CPU resetting)
Before first applying pow er, make sure all connections
required for your system are complete by referring to
Chapter 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 Make sure the transceiver power is OFF.
w While pushing [M-CL] and [F-INP], push [POWER]
for 2 sec.to turn power ON.
•The internal CPU is reset.
•A/D convertor calibration of the DSP unit starts and it
takes 10 sec.
•The transceiver displa ys its initial VFO frequencies when
resetting is complete.
e Correct the set mode settings after resetting, if de-
sired.
■ Initial settings
After resetting the transceiver, set controls and
switches as shown in the figure below.
[POWER] [M-CL]
[F-INP]
[METER]: Po
[ANT]: 1
[ATT]: OFF
[P.AMP]: 1
[PBT CLR]: OFF
[NOTCH]: OFF
[LOCK]: OFF
[AGC]: MID*
1
[POWER]: OFF
[TUNER], [MONITOR],
[NB], [NR]: OFF
[COMP]*2: OFF WIDE;
[1/4],*
2
[TONE]*2: OFF
[VOX],*2 [BK-IN],*2
[RTTY FIL]*
2
: OFF
[AF]: Max. CCW
[RF/SQL]: 12 o’clock
[RF POWER]: Max. CW
[MIC GAIN]: 10–12 o’clock
[BAL]: Center
*
1
FAST in FM mode.
*
2
Appears in some modes.
Turn power ON, then check the display. If any of the
following indicators appear, turn them OFF as f ollows:
•Quick tuning step indicator “▼” : Push [TS].
•1 Hz frequency readout :Push [TS] for 2
sec. (while quick
tuning step is OFF)
•RIT indicator “” :Push [RIT].
•∂TX indicator “” : Push [∂TX].
•Split indicator “” :Push [SPLIT].
•Dualwatch indicator “”: Push [DUAL
WATCH].
•Twin peak filter indicator “”:Push [RTTY FIL].
•Auto notch indicator “”: Push [NOTCH].
•Manual notch indicator “”: Push [NOTCH].
MNMN
ANAN
TPFTPF
DUAL-WDUAL-W
SPLITSPLIT
∂TXTX
RITRIT
Under cooler temperatures, the LCD may appear
dark and unstable after turning power ON. This is
normal and does not indicate any equipment malfunction.
CW : Max. clockwise
CCW : Max. counterclockwise
23
4
FREQUENCY SETTING
■ VFO description
VFO is an abbreviation of Variable Frequency Oscillator, and traditionally refers to an oscillator.
The transceiver’s VFO is somewhat different.The VFO
of the IC-756PRO acts like a computer’s window and
can show one frequency and one operating mode.
You can call up a desired frequency to the VFO with
the keypad, memo pad-read switch (see p. 55) or the
memory transfer function (see p. 53). You can also
change the frequency with the tuning dial and select
the operating mode with the mode switches.
During dualwatch or split frequency operation, the sub
VFO is functional (non-outline, non-spotted, larger frequency characters). While pushing [XFC] during split
frequency operation, you can change the transmit
readout frequency with the keypad, memo pad-read
switch or the memory transfer function.
ANTANT
1
METERMETER
PoPo
BWBW
2.4k2.4k
SFTSFT
0
VFOVFO
FIL2FIL2
USBUSB
qw:pp
TXTX
1
CWCW
qr≥qpp≥pp
21.076.5021.076.50
Transfer
Transfer
Transfer
Change
21.295 MHz 28.025 MHz 7.001 MHz
KEYPAD
(BAND KEY)
MEMORY
CHANNEL
MEMO PAD
TUNING DIAL
Select
MODE
SWITCHES
•Differences between VFO mode and memory mode
VFO MODE
VFO shows a frequency and operating mode. If the
frequency or operating mode is changed, the VFO automatically memorizes the new frequency or new operating mode.
When a VFO is selected from another band or memory mode, the frequency and operating mode last
used for that VFO appear.
[EXAMPLE]
MEMORY MODE (pgs. 50–54)
Each memory channel shows a frequency and operating mode like a VFO. Even if the frequency or mode
is changed, the memory channel does not memorize
the new frequency or operating mode.
When the memory channel is selected from another
memory channel or VFO mode, the memorized frequency and operating mode appear.
[EXAMPLE]
ANT
METER
Po
BW
2.4k
SFT
VFO
FIL2
USB
TX
CW
21.076.50
ANT
METER
Po
BW
500
SFT
BPF
FIL2
CW
TX
VFO
USB
14.123.00
ANT
METER
Po
BW
2.4k
SFT
VFO
FIL2
USB
TX
CW
21.076.50
ANT
METER
Po
BW
2.4k
SFT
VFO
FIL2
USB
TX
CW
21.076.50
ANT
METER
Po
BW
2.4k
SFT
FIL2
USB
TX
VFO
USB
14.100.00
ANT
METER
Po
BW
2.4k
SFT
FIL2
USB
TX
VFO
USB
14.100.00
ANT
METER
Po
BW
2.4k
SFT
FIL2
USB
TX
VFO
USB
14.100.00
ANT
METER
Po
BW
2.4k
SFT
FIL2
USB
TX
VFO
USB
14.100.00
12
VFO is selected.
ANT
METER
Po
The frequency is changed.
Memory mode is selected.
VFO is selected again.
ANT
METER
Po
ANT
METER
Po
ANT
METER
Po
Changed frequency (14.123 MHz) appears.
1
1
1
1
BW
TX
BW
TX
2.4k
VFO
2.4k
VFO
0
SFT
USB
FIL2
qr≥qpp≥pp
21.076.50
1
0
SFT
USB
FIL2
qr≥qwe≥pp
21.076.50
1
BW
TX
BW
TX
500
2.4k
VFO
0
SFT
CW
14.123.00
0
USB
21.076.50
FIL2
FIL2
1
wq≥puy≥tp
VFO
SFT
qr≥qwe≥pp
1
BPF
CW
CW
USB
CW
qw:pp
qw:pp
qw:pp
qw:pp
Memory channel 1 is selected.
ANT
METER
Po
The frequency is changed.
Another memory channel is selected.
Memory channel 1 is selected again.
ANT
METER
Po
ANT
METER
Po
ANT
METER
Po
Changed frequency (14.123 MHz) does not appear and
memorized frequency (14.100 MHz) appears instead.
1
1
1
1
BW
TX
BW
TX
BW
TX
BW
TX
2.4k
2.4k
2.4k
2.4k
0
SFT
USB
14.100.00
0
USB
14.100.00
0
USB
14.100.00
0
USB
14.100.00
FIL2
USB
FIL2
USB
FIL2
USB
FIL2
USB
1
qr≥qpp≥pp
VFO
SFT
1
qr≥qwe≥pp
VFO
SFT
12
wq≥wrt≥pp
VFO
SFT
1
qr≥qpp≥pp
VFO
qw:pp
qw:pp
qw:pp
qw:pp
■ Direct frequency entry with the keypad
■ Frequency setting with the tuning dial
•For ham band use
q Push the desired band key on the keypad 1–3
times.
•3 different frequencies can be selected on each band
with the band key. (See “Triple band stacking register”
below.)
w Rotate the tuning dial to set the desired frequency.
e Select the desired operating mode with the mode
switch.(p.26)
•For general coverage receiver use
q Push [GENE] on the keypad 1–3 times.
•The [GENE] key calls up a frequency for general cov-
erage receiver use.
w Rotate the tuning dial to set the desired frequency.
•For quick tuning, use the quick tuning step function. (p.
25)
e Select the desired operating mode with the mode
switch.(p.26)
ANT
1
METER
Po
BWBW
2.4k2.4k
SFTSFT
0
VFOVFO
FIL2FIL2
USBUSB
qw:pp
TXTX
1
CWCW
o≥uip≥pp
21.076.5021.076.50
ANT
1
METER
Po
BWBW
2.4k2.4k
SFTSFT
0
VFOVFO
FIL2FIL2
USBUSB
qw:pp
TXTX
1
CWCW
qt≥qpp≥pp
21.076.5021.076.50
ANT
1
METER
Po
BWBW
2.4k2.4k
SFTSFT
0
VFOVFO
FIL2FIL2
USBUSB
qw:pp
TXTX
1
CWCW
wq≥wot≥pp
21.076.5021.076.50
ANT
1
METER
Po
BWBW
2.4k2.4k
SFTSFT
0
VFOVFO
FIL2FIL2
USBUSB
qw:pp
TXTX
1
CWCW
wq≥wpp≥pp
21.076.5021.076.50
24
4
FREQUENCY SETTING
The transceiver has a keypad for direct frequency
entry as described below.
q Push [F-INP].
•“ ” appears.
w Input the desired frequency.
•Input “•” (decimal point) between the MHz units and
kHz units.
e Push [(F-INP)ENT] to enter the input frequency.
•To cancel the input, push [MAIN/SUB] instead of
[(F-INP)ENT].
[EXAMPLE]
F-inp
If the dial lock function is activated, the lock indicator lights, and the tuning dial does
not function. In this case, push [LOCK] to deactivate the lock function.
TRIPLE BAND STACKING REGISTER
The triple band stacking register provides 3 memories
in one band.3 sets of a frequency and mode on each
band are automatically stored when used.
If a band key is pushed once, the frequency and
mode last used are called up.When the key is pushed
again, another stored frequency and mode are called
up.
This function is convenient when you operate 3
modes on one band. For example, one register is
used for a CW frequency, another for an SSB frequency and the other one for an RTTY frequency.
[EXAMPLE]
21 m
21 m
14 b
14.025.00
CW
14.090.00
RTTY
14.195.00
USB
14 MHz band
Push
14 b
21.025.00
CW
21.090.00
RTTY
21.295.00
USB
21 MHz band
Push
F-INP
ENT
21.280 21.245
14.025 MHz
1 04 2• 5
08 7• 2 5
ENT7 0• 6
F-INP ENT
2 4• 5
F-INP ENT
18.0725 MHz
1F-INP
706 kHz
F-INP ENT
• 15
5.100 MHz
F-INP ENT
7
7.000 MHz
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