Icom IC-756PROII User manual

INSTRUCTION MANUAL
HF/50 MHz
ALL MODE TRANSCEIVER
i756PRO™
This device complies with Part 15 of the FCC rules. Operation is sub-
ject to the following two conditions: (1) This device may not cause
harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
IC-756PROII.qxd 02.1.8 15:51 Page a

i
IMPORTANT
READ THIS INSTRUCTION MANUAL
CAREFULLY before attempting to operate the
transceiver.
SAVE THIS INSTRUCTION MANUAL. This
manual contains important safety and operating in-
structions for the IC-756PROII.
EXPLICIT DEFINITIONS
RWARNING HIGH VOLTAGE! NEVER at-
tach an antenna or internal antenna connector during
transmission. This may result in an electrical shock or
burn.
RNEVER 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 part or connectors on the rear panel of the
transceiver. This may result in an electric shock.
NEVER expose the transceiver to rain, snow or any
liquids.
AVOID using or placing the transceiver in areas with
temperatures below –10°C (+14°F) or above +50°C
(+122°F). Be aware that temperatures on a vehicle’s
dashboard can exceed 80°C (+176°F), resulting in per-
manent damage to the transceiver if left there for ex-
tended periods.
AVOID placing the transceiver in excessively dusty en-
vironments 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 trans-
ceiver 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 ex-
hausted.
Make sure the transceiver power is OFF before start-
ing 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 mag-
netic navigation compass to prevent erroneous indica-
tions.
BE CAREFUL! The heatsink will become hot when op-
erating 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 lin-
ear amplifier’s maximum input level, otherwise, the lin-
ear amplifier will be damaged.
Use Icom microphones only (supplied or optional).
Other manufacturer’s microphones have different pin
assignments, and connection to the IC-756PROII may
damage the transceiver.
PRECAUTIONS
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
WORD DEFINITION
RRWARNING Personal injury, fire hazard or electric
shock may occur.
CAUTION Equipment damage may occur.
NOTE
If disregarded, inconvenience only. No
risk or personal injury, fire or electric
shock.
Icom, Icom Inc. and the are registered trademarks of
Icom Incorporated (Japan) in the United States, the United
Kingdom, Germany, France, Spain, Russia and/or other
countries.
IC-756PROII.qxd 02.1.8 15:51 Page b

SUPPLIED ACCESSORIES
The transceiver comes with the following accessories.
Qty.
qDC power cable (OPC-025D) ............................ 1
wHand microphone (HM-36) ................................ 1
eSpare fuses (FGB 30 A) .................................... 2
rSpare fuse (FGB 5 A) ........................................ 1
tCW keyer plug (AP-330) .................................... 1
1
1
TABLE OF CONTENTS
qwe
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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 – 20
■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
■External antenna tuner
connections .................................. 19
■Transverter jack information ......... 19
■FSK and AFSK (SSTV)
connections .................................. 20
4 FREQUENCY SETTING ....... 21 – 24
■When first applying power
(CPU resetting) ............................. 21
■Initial settings ................................ 21
■VFO description ............................ 22
■Frequency setting with the
tuning dial ..................................... 23
■Direct frequency entry with
the keypad .................................... 23
■Advanced tuning functions ........... 24
5 RECEIVE AND TRANSMIT .. 25 – 50
■Mode selection ............................. 25
■Twin PBT operation ...................... 25
■Notch function .............................. 26
■Noise reduction ............................ 26
■Noise blanker ............................... 27
■DSP filter shape ............................ 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
■Preamp ......................................... 37
■Digital voice recorder .................... 38
■RTTY decoder .............................. 42
■RTTY tuning meter ....................... 42
■Electronic CW keyer ..................... 43
■Memory keyer ............................... 44
■Spectrum scope screen ................ 45
■Automatic antenna selection ........ 46
■Dial lock function .......................... 46
■Repeater operation ....................... 47
■Tone squelch operation ................ 48
■Antenna tuner operation ............... 49
■Optional external tuner
operation ...................................... 50
6 MEMORY OPERATION ........ 51 – 56
■Memory channels ......................... 51
■Memory channel selection ............ 51
■Memory channel screen ............... 52
■Memory channel programming ..... 53
■Frequency transferring ................. 54
■Memory names ............................. 55
■Memory clearing ........................... 55
■Memo pads ................................... 56
7 SCANS ................................. 57 – 61
■Scan types .................................... 57
■Preparation ................................... 57
■Programmed scan operation ........ 58
■∂F scan operation ........................ 58
■Fine programmed scan/
fine ∂F scan ................................. 59
■Memory scan operation ................ 59
■Select memory scan operation ..... 60
■Setting select memory channels .. 60
■Scan set mode ............................. 61
■Tone scan ..................................... 61
8 CLOCK AND TIMERS .......... 62 – 63
■Setting the current time ................ 62
■Timer function activity.................... 62
■Setting power-on time .................. 63
■Setting power-off period ............... 63
■Timer operation ............................ 63
9 SET MODE ........................... 64 – 73
■Set mode description .................... 64
■Level set mode ............................. 65
■Display set mode .......................... 66
■DSP filter set mode ....................... 67
■Timer set mode ............................. 68
■Miscellaneous (others) set mode .. 68
10 OPTION INSTALLATION ............ 74
■Opening the transceiver’s case .... 74
■UT-102 VOICE SYNTHESIZER UNIT ... 74
11 MAINTENANCE ................... 75 – 77
■Troubleshooting ............................ 75
■Fuse replacement ......................... 76
■Clock backup battery
replacement .................................. 76
■Tuning dial brake adjustment ....... 77
■Frequency calibration
(approximate) ................................ 77
12 INTERNAL VIEWS ...................... 78
13 CONTROL COMMAND ......... 79– 82
■Remote jack (CI-V) information .... 79
14 SPECIFICATIONS ....................... 83
15 OPTIONS ..................................... 84
16 ABOUT CE ................................... 85
IC-756PROII.qxd 02.1.8 15:51 Page 1

■Front panel
qPOWER SWITCH [POWER/TIMER]
➥Push momentarily to turn power ON.
• Turn the optional DC power supply ON in advance.
•A/D converter calibration of the DSP unit starts and it
takes approx. 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 1 sec. to turn power OFF.
wTRANSMIT SWITCH [TRANSMIT]
Selects transmitting or receiving.
•The [TX] indicator lights red while transmitting and the
[RX] indicator lights green when the squelch is open.
eHEADPHONE JACK [PHONES]
Accepts headphones.
• Output power: 5 mW with an 8 Ωload.
•When headphones are connected, the internal speaker
or connected external speaker does not function.
rELECTRONIC KEYER JACK [ELEC-KEY] (p. 43)
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. 43)
•A straight key jack is separately available on the rear
panel. See [KEY] on p. 12.
•Keyer polarity (dot and dash) can be reversed in keyer
set mode. (p. 43)
•4-channel memory keyer is available for your conve-
nience. (p. 44)
tMICROPHONE CONNECTOR [MIC]
Accepts the supplied or optional microphone.
•See p. 84 for appropriate microphones.
•See p. 9 for microphone connector information.
yAF CONTROL [AF] (inner control)
Varies the audio output level from the speaker.
uMIC 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 BK-IN DELAY KEY SPEED
F-1 F-2 F-3 F-4 F-5
HF/50MHz TRANSCEIVER
i756PRO™
SSB CW/RTTY AM/FM FILTER EXIT/SET
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IC-756PROII.qxd 02.1.8 15:51 Page 2

2
3
PANEL DESCRIPTION
iRF 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 re-
ceived.
•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. 69)
•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.
oRF POWER CONTROL [RF POWER]
Continuously varies the RF output power from min-
imum (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. 26)
Adjusts the noise reduction level when the noise re-
duction is in use. Set for maximum readability.
!2 NOISE REDUCTION SWITCH [NR] (p. 26)
Switches the noise reduction ON and OFF.
!3 NOISE BLANKER SWITCH [NB] (p. 27)
➥Switches the noise blanker ON and OFF when
pushed. The noise blanker reduces pulse-type
noise such as that generated by automobile igni-
tion systems. This function cannot be used for
FM, or non-pulse-type noise.
➥Enters the noise blanker level set mode when
pushed for 1 sec.
!4 S/RF METER (p. 36)
Shows the signal strength while receiving. Shows
the relative output power, SWR, ALC or compres-
sion 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. 49)
➥Turns the antenna tuner ON and OFF (bypass)
when pushed momentarily.
➥Starts to tune the antenna manually when
pushed for 1 sec.
•When the tuner cannot tune the antenna, the tuning
circuit is bypassed automatically after 20 sec.
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.
•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.)
IC-756PROII.qxd 02.1.8 15:51 Page 3

4
2PANEL DESCRIPTION
■Front panel (continued)
!7 COMPRESSION LEVEL CONTROL [COMP] (p. 37)
Adjusts the speech compression level in SSB.
!8 SEMI BREAK-IN DELAY CONTROL [BK-IN DELAY]
Adjusts the transmit-to-receive switching delay time
for CW semi break-in operation.
!9 ELECTRONIC CW KEYER SPEED CONTROL
[KEY SPEED] (p. 43)
Adjusts the internal electronic CW keyer’s speed.
•6 wpm (min.) to 60 wpm (max.) can be set.
@0 MODE SWITCHES
Selects the desired mode. (p. 25)
•Announces the selected mode when an optional UT-102
is installed. (pgs. 71, 74)
➥Selects USB and LSB mode alternately.
➥Selects SSB data mode (USB-D, LSB-D)
when pushed for 1 sec. in SSB mode.
➥Selects CW and RTTY mode alternately.
➥Switches CW and CW-R (CW reverse)
mode when pushed for 1 sec. in CW
mode.
➥Switches RTTY and RTTY-R (RTTY re-
verse) mode when pushed for 1 sec. in
RTTY mode.
➥Selects AM and FM mode alternately.
➥Selects AM/FM data mode (AM-D, FM-D)
when pushed for 1 sec. AM/FM mode.
@1 LCD FUNCTION SWITCHES [F-1]–[F-5]
Push to select the function indicated in the LCD dis-
play above these switches.
•Functions vary depending on the operating condition.
@2 FILTER SWITCH [FILTER] (p. 29)
➥Selects one of 3 IF filter settings.
➥Enters the filter set mode when pushed for 1 sec.
@3 EXIT/SET SWITCH [EXIT/SET]
➥Exits from a set mode, etc. when pushed.
➥Selects the set mode screen when pushed for
1 sec. (p. 64)
@4 REC/PLAY SWITCH [REC/PLAY] (p. 38)
➥Play back the recorded audio in the channel R4
of the voice memory when pushed.
➥Records the receiving signal contents into the
channel R4 (max. 15 sec.) of the voice memory
when pushed for 1 sec.
@5 TUNING DIAL (p. 23)
Changes the displayed frequency, selects set mode
items, etc.
@6 MAIN/SUB SWITCH [MAIN/SUB]
Selects access to the main or sub readout.
•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]
➥Switches the selected readout operating mode
between the VFO mode and memory mode when
pushed. (pgs. 22, 51)
AM/FM
CW/RTTY
SSB
Slow Fast
KEY SPEED
BK-IN DELAY
Short delay for
high speed keying
(2 dot)
Long delay for
slow speed keying
(13 dot)
COMP
Compression
level decreases
Compression
level increases
NB NR
BAL NR
COMP BK-IN DELAY KEY SPEED
LOCKTX
RX
TWIN PBT
CW PITCH
F-1 F-2 F-3 F-4 F-5
REC/PLAY LOCK/SPEECH
RIT/ TX
TXRIT CLEAR
SPLIT
MP-W MP-R
DUAL
WATCH
VFO/
MEMO
MAIN/
SUB
CHANGE
1.8 3.5 7
10 14 18
21 24 28
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PBT CLR NOTCH
NOTCH
SSB CW/RTTY AM/FM FILTER EXIT/SET
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IC-756PROII.qxd 02.1.8 15:51 Page 4

5
2
PANEL DESCRIPTION
➥Transfers the memory contents to VFO when
pushed for 1 sec. (p. 54)
@8 MAIN/SUB CHANGE SWITCH [CHANGE]
➥Switches the frequency and selected memory
channel between main and sub readouts when
pushed.
•Switches between transmit frequency and receive fre-
quency when the split frequency function is ON.
(p. 32)
➥Equalizes the sub readout frequency to the main
readout frequency when pushed for 1 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.
➥Switches the antenna connector selec-
tion between ANT1 and ANT2 when
pushed. (p. 46)
➥Switches the [RX ANT] (receive antenna)
ON and OFF when pushed for 1 sec.
•When the receive antenna is activated, the
antenna which is connected to the [ANT1] or
[ANT2] is used for transmit only.
When a transverter is in use, this [ANT]
does not function and ‘XVERT’appears.
➥Selects RF power (Po), SWR, ALC or
COMP metering during transmit. (p. 36)
➥Switches the multi-function digital meter
ON and OFF when pushed for 1 sec.
➥Selects one of 2 receive RF preamps or
bypasses them. (p. 37)
•“P. AMP1”activates 10 dB preamp.
•“P. AMP2”activates 16 dB high-gain preamp.
✔ What is the preamp?
The preamp amplifies received signals in the front end cir-
cuit 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 broadcast-
ing station, are near your location.
➥Activates or selects fast, middle or slow
AGC time constant when pushed. (p. 30)
•“FAST”is only available for FM mode.
➥Enters the AGC set mode when pushed
for 1 sec. (p. 30)
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.
✔ What is the AGC?
The AGC controls receiver gain to produce a constant audio
output level, even 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 1 sec. in non-CW modes. (p. 35)
✔ What is the VOX function?
The VOX function (voice operated transmission) starts trans-
mission without pushing the transmit switch or PTT switch
when you speak into the microphone; then, automatically re-
turns 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 switches 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 1 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 in-
terference. 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)
➥Switches the narrow, middle or wide
transmit filter when pushed for 1 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 dis-
tance communication or when propagation conditions are poor.
➥Turns the 1⁄4function ON and OFF in
SSB data, CW and RTTY modes. (p. 24)
•1⁄4function sets dial rotation to 1⁄4of normal
for fine tuning.
➥Switches the tone encoder, tone squelch
function and no tone operation when
pushed in FM mode. (pgs. 47, 48)
➥Enters the tone set mode when pushed
for 1 sec. in FM mode. (pgs. 47, 48)
BK-INBK-IN
OFFOFF
VOXVOX
OFFOFF
AGCAGC
MIDMID
ATTATT
OFFOFF
P.AMPP.AMP
OFFOFF
METERMETER
PoPo
ANTANT
1
RTTYRTTY
FILFIL
OFFOFF
COMPCOMP
OFFOFF
WIDEWIDE
1/41/4
OFFOFF
TONETONE
IC-756PROII.qxd 02.1.8 15:51 Page 5

■Front panel (continued)
#0 LOCK/SPEECH SWITCH [LOCK/SPEECH]
➥Push momentarily to toggle the dial lock function
ON and OFF. (p. 46)
➥Pushing for 1 sec. announces the S-meter indi-
cation and the selected readout frequency when
an optional UT-102 is installed. (p. 74)
#1 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).
#2 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 1 sec.
✔ What is the RIT function?
The RIT (Receiver Incremental Tuning) shifts the receive fre-
quency without shifting the transmit frequency.
This is useful for fine tuning stations calling you on an off-fre-
quency or when you prefer to listen to slightly different-
sounding voice characteristics, etc.
#3 ∂∂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
frequency when pushed for 1 sec.
✔ What is the
∂∂
TX function?
The ∂TX shifts the transmit frequency without shifting the re-
ceive frequency. This is useful for simple split frequency op-
eration in CW, etc.
#4 CLEAR SWITCH [CLEAR] (p. 34)
Clears the RIT/∂TX shift frequency when pushed
for 1 sec. or when pushed momentarily, depending
on the quick RIT/∂TX clear function setting (p. 72).
#5 CW PITCH CONTROL [CW PITCH]
(outer control; p. 29)
Shifts the received CW audio pitch and monitored
CW audio pitch without changing the operating fre-
quency.
#6 MANUAL NOTCH FILTER CONTROL [NOTCH]
(inner control; p. 26)
Varies 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
6
2PANEL DESCRIPTION
NB NR
BAL NR
COMP BK-IN DELAY KEY SPEED
LOCKTX
RX
TWIN PBT
CW PITCH
F-1 F-2 F-3 F-4 F-5
REC/PLAY LOCK/SPEECH
RIT/ TX
TXRIT CLEAR
SPLIT
MP-W MP-R
DUAL
WATCH
VFO/
MEMO
MAIN/
SUB
CHANGE
1.8
1
3.5
2
7
3
10
4
14
5
18
6
21
7
24
8
28
9
GENE 50
0
F-INP
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MW
M-CL
TS
XFC
CEIVER
756PRO™
PBT CLR NOTCH
NOTCH
SSB CW/RTTY AM/FM FILTER EXIT/SET
$7 $6 $5 $1 $0 #9
#4
#6
#5
#3
#8
#7
#2
#1
#0
$2$3$4
IC-756PROII.qxd 02.1.8 15:51 Page 6

7
2
PANEL DESCRIPTION
#7 PBT CLEAR SWITCH [PBT CLR] (p. 25)
Clears the PBT settings when pushed for 1 sec.
•The [PBT CLR] indicator lights when PBT is in use.
#8 NOTCH SWITCH [NOTCH] (p. 26)
➥Switches the notch function between auto, man-
ual 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 un-
wanted tones via the DSP circuit.
#9 PASSBAND TUNING CONTROLS [TWIN PBT]
Adjust the receiver’s “passband width”of the DSP
filter. (p. 25)
•Passband width and shift frequency are displayed in the
LCD.
•Push [PBT CLR] for 1 sec. to clear the settings when not
in use.
•Variable range is set to half of the IF filter passband
width. 25 Hz steps and 50 Hz steps are available.
•These controls function as an IF shift control while in AM
mode and when the RTTY filter is turned ON. Only the
inner control may function in this case.
✔ 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.
$0 LOCK INDICATOR [LOCK] (p. 46)
Lights when the dial lock function is activated.
$1 MEMO PAD-READ SWITCH [MP-R] (p. 56)
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)
$2 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. 23)
•Icom’s triple band stacking register memorizes 3 fre-
quencies 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. 23, 51)
•e.g. to enter 14.195 MHz, push [F-INP] [1] [4] [•] [1]
[9] [5] [(F-INP)ENT].
$3 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 1 sec. (Quick dualwatch function)
•The quick dualwatch function can be turned OFF
using set mode. (p. 69)
$4 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 1 sec. in non-FM modes. (Quick split function)
•The offset frequency is shifted from the main readout
frequency in FM mode. (pgs. 47, 69)
•The quick split function can be turned OFF using set
mode. (p. 69)
➥Turns the split function ON and shifts the sub
readout frequency after inputting an offset
(±4 MHz in 1 kHz steps).
$5 MEMO PAD-WRITE SWITCH [MP-W] (p. 56)
Programs the selected readout frequency and op-
erating 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)
$6 RECEIVE INDICATOR [RX]
Lights green while receiving a signal and when the
squelch is open.
$7 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
IC-756PROII.qxd 02.1.8 15:51 Page 7

8
2PANEL DESCRIPTION
■Front panel (continued)
$8 LCD FUNCTION DISPLAY (See p. 10 for details.)
Shows the operating frequency, function switch
menus, spectrum screen, memory channel screen,
set mode settings, etc.
$9 MEMORY UP/DOWN SWITCHES [YY]/[ZZ](p. 51)
➥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.
%0 MEMORY WRITE SWITCH [MW] (p. 53)
Stores the selected readout frequency and operat-
ing mode into the displayed memory channel when
pushed for 1 sec.
•This function is available both in VFO and memory
modes.
%1 MEMORY CLEAR SWITCH [M-CL] (p. 55)
Clears the selected readout memory channel con-
tents when pushed for 1 sec. in memory mode.
•The channel becomes a blank channel.
•This switch does not function in VFO mode.
%2 QUICK TUNING SWITCH [TS] (p. 24)
➥Turns the quick tuning step ON and OFF.
•While the quick tuning indicator is displayed, the fre-
quency 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 1 sec.
•1 Hz indications appear in both readouts and the fre-
quency can be changed in 1 Hz steps.
➥While the quick tuning step is ON, enters the
quick tuning step set mode when pushed for
1 sec.
%3 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)
BWBW 2.4k2.4k SFTSFT 0
FIL2FIL2
qw pp
TXTX
CWCW
qr.qpp.pp
21.076.5021.076.50
VFOVFO
USBUSB
1
METER
Po
ANT
1
Quick tuning indicator
NB NR
BAL NR
COMP BK-IN DELAY KEY SPEED
LOCKTX
RX
TWIN PBT
CW PITCH
F-1 F-2 F-3 F-4 F-5
REC/PLAY LOCK/SPEECH
RIT/ TX
TXRIT CLEAR
SPLIT
MP-W MP-R
DUAL
WATCH
VFO/
MEMO
MAIN/
SUB
CHANGE
1.8
1
3.5
2
7
3
10
4
14
5
18
6
21
7
24
8
28
9
GENE 50
0
F-INP
ENT
Y
Z
MW
M-CL
TS
XFC
EIVER
756PRO™
PBT CLR NOTCH
NOTCH
SSB CW/RTTY AM/FM FILTER EXIT/SET
$9 %0 %1 %2 %3
$8
IC-756PROII.qxd 02.1.8 15:51 Page 8

9
2
PANEL DESCRIPTION
•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.
NOTE: DC voltage is applied to pin 1 for micro-
phone operation. Take care when using a non-Icom
microphone.
yGND (PTT ground)
tPTT
rMain readout squelch switch
qMicrophone input
w+8 V DC output
eFrequency up/down
uGND
(Microphone ground)
iMain readout AF output
(varies with [AF]/[BAL])
■Microphone (HM-36)
qUP/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. 43)
wPTT SWITCH
Push and hold to transmit; release to receive.
q
w
+
+
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
[MIC] FUNCTION DESCRIPTION
Pin No.
w+8 V DC output Max. 10 mA
e
Frequency up Ground
Frequency down Ground through 470 Ω
rSquelch open “Low”level
Squelch closed “High”level
IC-756PROII.qxd 02.1.8 15:51 Page 9

10
2PANEL DESCRIPTION
■LCD display
qTX INDICATOR
Indicates the frequency readout for transmit.
wVFO/MEMORY CHANNEL INDICATOR
(pgs. 22, 51)
Indicates the VFO mode or selected memory chan-
nel number.
eSELECT MEMORY CHANNEL INDICATOR (p. 60)
Indicates the displayed memory channel is set as a
select memory channel.
rMULTI-FUNCTION SWITCH GUIDE
Indicates the function of the multi-function switches.
tLCD FUNCTION SWITCH GUIDE
Indicates the function of the LCD function switches
([F-1] –[F-5]).
yMULTI-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.
uMEMORY CHANNEL READOUTS (p. 51)
➥Show the selected memory channel contents in
VFO mode.
➥Show the VFO contents in memory mode.
iFREQUENCY READOUTS (p. 23)
Show the operating frequency.
•Outline characters are used for non-accessing readout.
oCLOCK READOUT (p. 62)
Shows the current time.
!0 RTTY TUNING INDICATOR (p. 42)
Shows the tuning level in RTTY mode.
!1 QUICK TUNING INDICATOR (p. 24)
Appears when the quick tuning step function is in
use.
!2 PASSBAND WIDTH INDICATOR (p. 25)
Graphically displays the passband width for twin
PBT operation and center frequency for IF shift op-
eration.
!3 IF FILTER INDICATOR (p. 29)
Shows the selected IF filter number.
!4 SHIFT FREQUENCY INDICATOR (p. 25)
Shows the shift frequency of the IF filter.
!5 MODE INDICATOR (p. 25)
Shows the selected mode.
!6 BAND WIDTH INDICATOR (p. 29)
Shows the passband width of the IF filter.
ANT
1
COMP
OFF
WIDE
HOLD
SUB
MARKER
ATT
10dB
Grid
10k
10dB
SPAN ATT MARKER HOLD SET
METER
Po
P.AMP
1
AGC
MID
ATT
OFF
VOX
OFF
+12.5k+12.5k
-12.5k-12.5k SPECTRUM SCOPESPECTRUM SCOPE
BW 2.4k SFT 0
USB
qw pp
VFO 21.085.00
TX
CW
FIL2
qr.qqy.pp
qr.qpp.pp
56ß USB
1ß 21.085.00 CW
VFO
FIL2
t
i
i
!6 !4!5 !2!3 !1 !0 o
y
u
u
r
q
w
e
w
IC-756PROII.qxd 02.1.8 15:51 Page 10

11
2
PANEL DESCRIPTION
ATT
0FF
METER
Po
P.AMP
1
BK-IN
OFF
1/4
OFF
BW 2.4k SFT 0
VFO
FIL2
CW
qw pp
AGC
MID
1
TX
VFO
1
USB
CW
CW
FIL2
qr.qpp.pp
qr.qpp.pp
--. ---. --
--. ---. --
SCOPE VOICE KEYER MEMORY SCAN
ANT
1
BK-INBK-IN
OFFOFF
1/41/4
OFFOFF
AGCAGC
MIDMID CQ TEST CQ TEST DE ICOM ICOMCQ TEST CQ TEST DE ICOM ICOM
TEST
QRZ?
CFM TU
UR 5NN001 BK
M1
M2
M3
M4
M1 M2 M3 M4 -1
BK-IN
OFF
1/4
OFF
AGC
MID
T4 - - -
T1 -
- -
T3 -
- -
VOICE RECORDER
T2 -
- -
TX MEMORY
T1 T2 T3 T4 T/R
BK-INBK-IN
OFFOFF
1/41/4
OFFOFF
AGCAGC
MIDMID GridGrid
2.5k2.5k
10dB10dB
+12. 5k+12. 5k
-12. 5k-12. 5k SPECTRUM SCOPESPECTRUM SCOPE
SPANSPAN ATTATT MARKERMARKER HOLDHOLD
SET
BK-INBK-IN
OFFOFF
1/41/4
OFFOFF
AGCAGC
MIDMID
SCANSCAN
∂FSpanSpan ± 10kHz 10kHz
ProgrammedProgrammed P1P1 0.500.00MHz0.500.00MHz
scan edgesscan edges P2P2 29.999.99MHz29.999.99MHz
PROGPROG
∂F
FINEFINE
∂F SPANF SPAN SETSET
BK-INBK-IN
OFFOFF
1/41/4
OFFOFF
AGCAGC
MIDMID
SCANSCAN
∂FSpanSpan ± 10kHz 10kHz
ProgrammedProgrammed P1P1 0.500.00MHz0.500.00MHz
scan edgesscan edges P2P2 29.999.99MHz29.999.99MHz
MEMOMEMO ∂FSELECTSELECT ∂F SPANF SPAN SETSET
THRESHOLD 9
RTTYRTTY
FILFIL
ONON
AGCAGC
MIDMID
RTTY DECODERTTY DECODE
MEMORY KEYERMEMORY KEYER
**** RTTY Decode Monitor ******** RTTY Decode Monitor ****
45bps BAUDOT Mark=2125,Shift=170 45bps BAUDOT Mark=2125,Shift=170
UnShift On Space support (SET-OTHERS) UnShift On Space support (SET-OTHERS)
New Line Code selectable (SET-OTHERS) New Line Code selectable (SET-OTHERS)
If RTTY-FIL is OFF, Please turn ON. If RTTY-FIL is OFF, Please turn ON.
1/41/4
OFFOFF
HOLDHOLD CLRCLR ADJADJ WIDEWIDE
BK-INBK-IN
OFFOFF
1/41/4
OFFOFF
AGCAGC
MIDMID
MEMORYMEMORY
9999 --.---.----.---.-- ------------ ------
PP11000.500.000.500.00 USBUSB FL2 SCAN EDGEFL2 SCAN EDGE
P2P2 29.999.9929.999.99 USBUSB FL2 SCAN EDGEFL2 SCAN EDGE
1 1 --.---.----.---.-- ------------ ------
2 2 --.---.----.---.-- ------------ ------
33--.---.----.---.-- ------------ ------
4 4 --.---.----.---.-- ------------ ------
ROLLROLL SETSET SELECTSELECT NAMENAME WIDEWIDE
•Start up screen
•Voice recorder screen (p. 38)
•Memory keyer screen (CW mode: p. 43)
•Spectrum scope screen (p. 45)
•Memory channel screen (p. 52)
•Programmed scan screen (VFO mode: p. 58)
•RTTY decoder screen (RTTY mode: p. 42) •Memory scan screen (Memory mode: p. 59)
F-1
F-1
F-4F-2
F-5
F-3
F-5
F-3
F-2 F-3 F-4 F-5
■Screen menu arrangement
The following screens can be selected from the start
up screen. Choose the desired screen using the fol-
lowing chart.
Pushing [EXIT/SET] several times returns to the start
up screen. See p. 64 for set mode arrangement.
IC-756PROII.qxd 02.1.8 15:51 Page 11

12
2PANEL DESCRIPTION
■Rear panel
qTRANSVERTER JACK [XVERT] (p. 19)
External transverter input/output jack. Activated by
voltage applied to [ACC(2)] pin 6.
wRECEIVE ANTENNA CONNECTOR [RX ANT]
(p. 16)
Connects a 50 Ωgeneral coverage antenna with an
RCA connector.
eTUNER 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.
rACCESSORY SOCKET 1 [ACC(1)]
tACCESSORY 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.
ySTRAIGHT KEY JACK [KEY] (p. 15)
Accepts a straight key or external electronic keyer
with 1⁄4inch standard plug.
•[ELEC-KEY] on the front panel can be used for a straight
key or external electronic keyer. Deactivate the internal
electronic keyer in keyer set mode. (p. 43)
If you use an external electronic keyer, make
sure the voltage retained by the keyer is less
than 0.4 V when the key is ON.
uCI-V REMOTE CONTROL JACK [REMOTE]
(p. 16)
➥Designed for use with a personal computer for re-
mote control of transceiver functions.
➥Used for transceive operation with another Icom
CI-V transceiver or receiver.
iEXTERNAL SPEAKER JACK [EXT SP]
(pgs. 16, 84)
Accepts an 4–8 Ωspeaker.
oALC INPUT JACK [ALC] (p. 18)
Connects to the ALC output jack of a non-Icom lin-
ear amplifier.
!0 SEND CONTROL JACK [SEND] (p. 18)
Goes to ground while transmitting to control exter-
nal equipment such as a linear amplifier.
•Max. control level: 16 V DC/0.5 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
(+)
(_)
qw!0
!1
ertyuio
!4 !3 !2
IC-756PROII.qxd 02.1.8 15:51 Page 12

13
2
PANEL DESCRIPTION
!2 ANTENNA CONNECTOR 1 [ANT1]
!3 ANTENNA CONNECTOR 2 [ANT2] (pgs. 14, 15)
Accept a 50 Ωantenna 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 electri-
cal shocks, TVI, BCI and other problems.
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, respectively. (p. 65)
ACC (1) PIN No. NAME DESCRIPTION SPECIFICATIONS
1
2
3
45
67
8
“High”level : More than 2.4 V
1 RTTY Controls RTTY keying “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.
Input/output pin. Ground level : –0.5 V to 0.8 V
3 SEND Goes to ground when transmitting. Output current : Less than 20 mA
When grounded, transmits. Input current (Tx) : Less than 200 mA
Connected in parallel with ACC(2) pin 3.
4 MOD Modulator input. Input impedance : 10 kΩ
Connects to a modulator. Input level : Approx. 100 mV rms
AF detector output. Output impedance : 4.7 kΩ
5 AF Fixed, regardless of [AF] position Output level : 100–300 mV rms
in default settings. (see notes below)
6 SQLS Squelch output. SQL open : Less than 0.3 V/5 mA
Goes to ground when squelch opens. SQL 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.
Control voltage : –4 V to 0 V
8 ALC ALC voltage input. Input impedance : More than 10 kΩ
Connected in parallel with ACC(2) pin 5.
ACC
PIN No. NAME DESCRIPTION SPECIFICATIONS
1
2
3
45
67
1 8 V Regulated 8 V output. Output voltage : 8 V ±0.3 V
Output current : Less than 10 mA
2 GND Same as ACC(1) pin 2.
3 SEND Same as ACC(1) pin 3.
4 BAND Band voltage output. Output voltage : 0 to 8.0 V
(Varies with amateur band)
5 ALC Same as ACC (1) pin 8.
6TRV
Activates [XVERT] input/output Input impedance : More than 10 kΩ
when “HIGH”voltage is applied. Input voltage : 2 to 13.8 V
7
13.8 V Same as ACC(1) pin 7.
Rear panel view
Rear panel view
IC-756PROII.qxd 02.1.8 15:51 Page 13

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 equip-
ment included with the IC-756PROII, see ‘Supplied ac-
cessories’on p. 1 of this manual.
■Selecting a location
Select a location for the transceiver that allows ade-
quate air circulation, free from extreme heat, cold, or
vibrations, and away from TV sets, TV antenna ele-
ments, 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 de-
pending on your operating conditions.
■Grounding
To prevent electrical shock, television interference
(TVI), broadcast interference (BCI) and other prob-
lems, 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 be-
tween the [GND] terminal and ground as short as pos-
sible.
RWARNING: NEVER connect the [GND]
terminal to a gas or electric pipe, since the connec-
tion could cause an explosion or electric shock.
■Antenna connection
For radio communications, the antenna is of critical im-
portance, along with output power and sensitivity. Se-
lect antenna(s), such as a well-matched 50 Ωantenna,
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-756PROII has an SWR meter to mon-
itor the antenna SWR continuously.
PL-259 CONNECTOR INSTALLATION EXAMPLE
30 mm ≈9⁄8in 10 mm ≈3⁄8in 1–2 mm ≈1⁄16 in
30 mm
10 mm (soft solder)
10 mm
1–2 mm
solder solder
Soft
solder
Coupling ring
Slide the coupling ring
down. Strip the cable
jacket and soft solder.
Slide the connector
body on and solder it.
Screw the coupling
ring onto the
connector body.
Strip the cable as
shown at left. Soft sol-
der the center con-
ductor.
q
w
e
r
IC-756PROII.qxd 02.1.8 15:51 Page 14

3
15
INSTALLATION AND CONNECTIONS
■Required connections
•Front panel
•Rear panel
SWR
S
COMP
ALC
Po
010
10
25 50 100
20
10
1.5 23
159+20 +40 + 6 0dB
dB
RIT/ TX
TX
F-1
SSB
F-2 F-3 F-4 F-5
CW/RTTY AM/FM FILTER EXIT/SET
123
456
789
0
ENT
NOTCH
PBT CLR
LOCKTX
RX
NOTCH
TWIN PBT
CW PITCH
REC/PLAY LOCK/SPEECH
RIT CLEAR
SPLIT
MP-W MP-R
DUAL
WATCH
VFO/
MEMO
MAIN/
SUB
CHANGE
1.8 3.5 7
10 14 18
21 24 28
GENE 50 F-INP
MW
M-CL
TS
XFC
i756PRO™
TIMER
POWER
TRANSMIT
PHONES
ELEC-KEY
MIC
TUNER MONITOR NB NR
AF BAL NRRF/SQL
MIC GAIN RF POWER COMP KEY SPEEDBK-IN DELAY
HF/50MHz TRANSCEIVER
CW KEY
A straight key can be used
when the internal electronic
keyer is turned OFF in keyer
set mode. (p. 43)
MICROPHONES (p. 84)
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 (p.17)
STRAIGHT KEY
PS-125
IC-756PROII.qxd 02.1.8 15:51 Page 15

■Advanced connections
•Front panel
•Rear panel
16
3INSTALLATION AND CONNECTIONS
SWR
S
COMP
ALC
Po
010
10
25 50 100
20
10
1.5 23
159+20 +40 + 6 0dB
dB
RIT/ TX
TX
F-1
SSB
F-2 F-3 F-4 F-5
CW/RTTY AM/FM FILTER EXIT/SET
123
456
789
0
ENT
NOTCH
PBT CLR
LOCKTX
RX
NOTCH
TWIN PBT
CW PITCH
REC/PLAY LOCK/SPEECH
RIT CLEAR
SPLIT
MP-W MP-R
DUAL
WATCH
VFO/
MEMO
MAIN/
SUB
CHANGE
1.8 3.5 7
10 14 18
21 24 28
GENE 50 F-INP
MW
M-CL
TS
XFC
i756PRO™
TIMER
POWER
TRANSMIT
PHONES
ELEC-KEY
MIC
TUNER MONITOR NB NR
AF BAL NRRF/SQL
MIC GAIN RF POWER COMP KEY SPEEDBK-IN DELAY
HF/50MHz TRANSCEIVER
HEADPHONES
MIC
The AFSK modulation signal
can be input from [MIC]. (p. 20)
ANTENNA 1, 2 (pgs. 18, 19)
Connects a linear amplifier,
antenna selector, etc.
EXTERNAL SPEAKER (p. 84)
ACC SOCKETS (pgs. 13, 20)
RX ANTENNA
TRANSVERTER
(p. 19)
Connects a transverter
for V/UHF band use.
SP-21
AH-4/AH-3
(p. 19)
AH-2b
[REMOTE] (p. 79)
Used for computer control and transceive operation.
[SEND], [ALC]
(p. 18)
Used for connecting a
non-Icom linear ampli-
fier.
When using the AH-4/AH-3,
it must be connected to the
[ANT1] connector.
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17
3
INSTALLATION AND CONNECTIONS
■Power supply connections
Use the optional PS-125 DC power supply with a 25 A
capacity when operating the transceiver with AC
power. Refer to the diagrams below.
CAUTION: Before connecting the DC power
cable, check the following important items. Make
sure:
•The [POWER] switch is OFF.
•Output voltage of the power source is 12–15 V
when you use a non-Icom power supply.
•DC power cable polarity is correct.
Red : positive +terminal
Black : negative _terminal
CONNECTING A DC POWER SUPPLY
to DC power
socket
A DC power supply
AC outlet
AC cable
30 A fuses
Supplied
DC power cable
13.8 V; at least 23 A
Black
_
Red
+
Transceiver
CONNECTING A VEHICLE BATTERY
12 V
battery
Supplied
DC power cable
+red
_black Crimp
Solder
Grommet
NEVER connect to
a 24 V battery.
NOTE: Use terminals for
the cable connections.
NEVER connect to a battery without supplied DC fuses,
otherwise a fire hazard may occur.
CONNECTING PS-125 DC POWER SUPPLY
PS-125
Connect to an AC outlet
using the supplied AC cable.
DC power cable
DC power
socket
Transceiver
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18
3INSTALLATION 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.
To an
antenna ACC-1
ANT
ANT2 ANT1 ACC(2)
INPUT1
INPUT2
REMOTE
EXCITER
11&2
GND
GND
IC-PW1
AC outlet
(Non-European versions: 100–120/220–240 V
European version : 230 V)
Ground Transceiver
REMOTE
Remote control cable (supplied with the IC-PW1)
ACC cable (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)
Coaxial cable
(optional)
Connect
[INPUT2]
if necessary
CONNECTING A NON-ICOM LINEAR AMPLIFIER
RWARNING:
Set the transceiver output power
and linear amplifier ALC output
level referring to the linear amplifier
instruction manual.
The ALC input level must be in the
range 0 V to –4 V, and the trans-
ceiver does not accept positive volt-
age. 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 0.5 A. If this
level is exceeded, a large external relay must be used.
RF OUTPUT RF INPUT
ALC
SEND
50 Ωcoaxial cable
Transceiver
ANT1
ALC SEND
To an
antenna
Non-Icom linear amplifier
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