IC-756PROII
INSTRUCTION MANUAL
HF/50 MHz
ALL MODE TRANSCEIVER
i756PRO™
This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause
harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.
IMPORTANT
EXPLICIT DEFINITIONS
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-756PROII.
PRECAUTIONS
R WARNING HIGH VOLTAGE! NEVER at-
tach 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.
WORD DEFINITION
RR
WARNING
CAUTION Equipment damage may occur.
NOTE
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 exhausted.
Make sure the transceiver power is OFF before starting the vehicle. This will avoid possible damage to the
transceiver by ignition voltage spikes.
Personal injury, fire hazard or electric
shock may occur.
If disregarded, inconvenience only. No
risk or personal injury, fire or electric
shock.
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 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.
During maritime mobile operation, keep the transceiver
and microphone as far away as possible from the magnetic navigation compass to prevent erroneous indications.
BE CAREFUL! The heatsink will become hot when operating the transceiver continuously for long periods.
BE CAREFUL! If a linear amplifier is connected, set
the transceiver’s RF output power to less than the linear amplifier’s maximum input level, otherwise, the linear amplifier will be damaged.
Use Icom microphones only (supplied or optional).
Other manufacturer’s microphones have different pin
assignments, and connection to the IC-756PROII may
damage the transceiver.
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.
i
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
TABLE OF CONTENTS
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1
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
SUPPLIED ACCESSORIES
The transceiver comes with the following accessories.
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
Qty.
1
MIC GAIN
Recommended level for
an Icom microphone
IncreasesDecreases
AF RF/SQL
No audio output
Max. audio output
Decreases Increases
(dot)
(com)
(dash)
2
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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PANEL DESCRIPTION
■ Front panel
q POWER 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.
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. 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 convenience. (p. 44)
2
t MICROPHONE CONNECTOR [MIC]
Accepts the supplied or optional microphone.
•See p. 84 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.
PANEL DESCRIPTION
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.
2
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. 69)
• When setting as RF gain/squelch control
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. 26)
Adjusts the noise reduction level when the noise reduction is in use. Set for maximum readability.
•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.)
!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 ignition 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 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.
While rotating the RF gain control, noise may be
heard. This comes from the DSP unit and does not
indicate an equipment malfunction.
!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.
3
2
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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PANEL DESCRIPTION
■ Front panel (continued)
4
!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 display 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)
PANEL DESCRIPTION
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
2
➥ 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 frequency 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 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 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 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 interference. Only the inner control of [TWIN PBT] can be used
for the IF shift control.
✔
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. (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.
“OFF” is selected, the S-meter does not function.
(depends on mode), or turned OFF. While
➥ 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 distance communication or when propagation conditions are poor.
➥ Turns the 1⁄
4 function ON and OFF in
SSB data, CW and RTTY modes. (p. 24)
•1⁄4 function sets dial rotation to 1⁄4 of 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)
5
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
2
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
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VFO/
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MAIN/
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CHANGE
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PANEL DESCRIPTION
■ 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 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.
#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.
6
➥ Adds the ∂TX shift frequency to the operating
frequency when pushed for 1 sec.
✔
What is the ∂∂TX function?
The ∂TX shifts the transmit frequency without shifting the receive frequency. This is useful for simple split frequency operation in CW, etc.
#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 frequency.
#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
PANEL DESCRIPTION
PBT1
PBT2
TWIN PBT
Low cut High cutCenter
TWIN PBT TWIN PBT TWIN PBT
– +
NOTCHNOTCH
Notch OFF Notch ON
2
#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 unwanted 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.
$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 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. 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).
$0 LOCK INDICATOR [LOCK] (p. 46)
Lights when the dial lock function is activated.
$5 MEMO PAD-WRITE SWITCH [MP-W] (p. 56)
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)
$6 RECEIVE INDICATOR [RX]
Lights green while receiving a signal and when the
squelch is open.
$7 TRANSMIT INDICATOR [TX]
Lights red while transmitting.
7
2
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
1.813.527
3
10414518
6
21724828
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
PANEL 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 operating 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 contents 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 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 1 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
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
•When the split lock function is turned ON, pushing [XFC]
changed with the tuning dial, keypad, memo pad or the
[Y]/[Z] switches.
cancels the dial lock function. (p. 69)
8
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])
■ Microphone (HM-36)
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
PANEL DESCRIPTION
2
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. 43)
•MICROPHONE CONNECTOR
(Front panel view)
w PTT SWITCH
Push and hold to transmit; release to receive.
[MIC]
Pin No.
w +8 V DC output Max. 10 mA
e
r
CAUTION:
FUNCTION DESCRIPTION
Frequency up Ground
Frequency down Ground through 470 Ω
Squelch open “Low” level
Squelch closed “High” level
DO NOT short pin 2 to ground as this
can damage the internal 8 V regulator.
NOTE: DC voltage is applied to pin 1 for microphone operation. Take care when using a non-Icom
microphone.
• HM-36 SCHEMATIC DIAGRAM
9
2
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 21.085.00TXCW
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
PANEL DESCRIPTION
■ LCD display
10
q TX INDICATOR
Indicates the frequency readout for transmit.
w VFO/MEMORY CHANNEL INDICATOR
(pgs. 22, 51)
Indicates the VFO mode or selected memory channel number.
e SELECT MEMORY CHANNEL INDICATOR (p. 60)
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. 51)
➥ Show the selected memory channel contents in
VFO mode.
➥ Show the VFO contents in memory mode.
i FREQUENCY READOUTS (p. 23)
Show the operating frequency.
• Outline characters are used for non-accessing readout.
o CLOCK 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 operation.
!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.
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
∂
F SpanSpan : ± 10kHz 10kHz
ProgrammedProgrammed P1:P1: 0.500.00MHz0.500.00MHz
scan edgesscan edges P2:P2: 29.999.99MHz29.999.99MHz
PROGPROG
∂
F
FINEFINE
∂
F SPANF SPAN
SETSET
BK-INBK-IN
OFFOFF
1/41/4
OFFOFF
AGCAGC
MIDMID
SCANSCAN
∂
F
SpanSpan : ± 10kHz 10kHz
ProgrammedProgrammed P1:P1: 0.500.00MHz0.500.00MHz
scan edgesscan edges P2:P2: 29.999.99MHz29.999.99MHz
MEMOMEMO
∂
F
SELECTSELECT
∂
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
--.---.----.---.-- ------------ ------
PP 11 00 0.500.000.500.00 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
PANEL DESCRIPTION
2
The following screens can be selected from the start
up screen. Choose the desired screen using the following chart.
Pushing [EXIT/SET] several times returns to the start
up screen. See p. 64 for set mode arrangement.
11
2
Rear panel view
(+)
(_)
q w!0
!1
ertyuio
!4 !3 !2
PANEL DESCRIPTION
■ Rear panel
q TRANSVERTER JACK [XVERT] (p. 19)
External transverter input/output jack. Activated by
voltage applied to [ACC(2)] pin 6.
w RECEIVE ANTENNA CONNECTOR [RX ANT]
(p. 16)
Connects a 50 Ω general coverage antenna with an
RCA connector.
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 straight
key or external electronic keyer. Deactivate the internal
electronic keyer in keyer set mode. (p. 43)
u CI-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.
i EXTERNAL SPEAKER JACK [EXT SP]
(pgs. 16, 84)
Accepts an 4–8 Ω speaker.
o ALC INPUT JACK [ALC] (p. 18)
Connects to the ALC output jack of a non-Icom linear amplifier.
!0 SEND CONTROL JACK [SEND] (p. 18)
Goes to ground while transmitting to control external 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).
12
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.
PANEL DESCRIPTION
2
!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
TENNA TUNER
, connect it to the [ANT1] connector.
or AH-3
HF AUTOMATIC AN-
The internal antenna tuner activates for [ANT2] and
deactivates for [ANT1] when connecting the AH-4 or
AH-3.
DACC SOCKETS
ACC (1)
2
4
1
8
6
Rear panel view
PIN No.
NAME DESCRIPTION SPECIFICATIONS
1 RTTY Controls RTTY keying “Low” level : Less than 0.6 V
2 GND Connects to ground. Connected in parallel with ACC(2) pin 2.
Input/output pin.
3 SEND Goes to ground when transmitting.
When grounded, transmits.
5
3
7
4 MOD
Modulator input. Input impedance : 10 kΩ
Connects to a modulator. Input level : Approx. 100 mV rms
AF detector output.
5 AF Fixed, regardless of [AF] position
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.
!4 GROUND TERMINAL [GND] (pgs. 14, 15)
Connect this terminal to a ground to prevent electrical shocks, TVI, BCI and other problems.
“High” level : More than 2.4 V
Output current : Less than 2 mA
Ground level : –0.5 V to 0.8 V
Output current : Less than 20 mA
Input current (Tx) : Less than 200 mA
Connected in parallel with ACC(2) pin 3.
Output impedance : 4.7 kΩ
Output level : 100–300 mV rms
SQL closed : More than 6.0 V/100 µA
ACC
2
4
5
1
Rear panel view
3
6
7
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.
PIN No.
NAME DESCRIPTION SPECIFICATIONS
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.
(Varies with amateur band)
Output voltage : 0 to 8.0 V
5 ALC Same as ACC (1) pin 8.
6TRV
7
13.8 V
Activates [XVERT] input/output Input impedance : More than 10 kΩ
when “HIGH” voltage is applied. Input voltage : 2 to 13.8 V
Same as ACC(1) pin 7.
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)
13
3
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-756PROII, see ‘Supplied accessories’ 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.
■ 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.
PL-259 CONNECTOR INSTALLATION EXAMPLE
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.
■ 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.
r
30 mm ≈9⁄8
in 10 mm ≈
Screw the coupling
ring onto the
connector body.
3
⁄8
in 1–2 mm ≈
1
⁄16
Antenna SWR
Each antenna is tuned for a specified frequency
range and SWR may be increased out-of-range.
When the SWR is higher than approx. 2.0:1, the
transceiver’s power drops to protect the final transistor. In this case, an antenna tuner is useful to match
the transceiver and antenna. Low SWR allows full
power for transmitting even when using the antenna
tuner. The IC-756PROII has an SWR meter to monitor the antenna SWR continuously.
in
14
■ Required connections
SWR
S
COMP
ALC
Po
0
10
10
25 50
100
20
1
0
1.5
2
3
1
5
9
+20
+40
+60dB
dB
RIT/ TX
TX
F-1
SSB
F-2 F-3 F-4 F-5
CW/RTTY
AM/FM FILTER EXIT/SET
1
2
3
4
5
6
7
8
9
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
• Front panel
INSTALLATION AND CONNECTIONS
3
• Rear panel
15
3
SWR
S
COMP
ALC
Po
0
10
10
25 50
100
20
1
0
1.5
2
3
1
5
9
+20
+40
+60dB
dB
RIT/ TX
TX
F-1
SSB
F-2 F-3 F-4 F-5
CW/RTTY
AM/FM FILTER EXIT/SET
1
2
3
4
5
6
7
8
9
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 amplifier.
When using the AH-4/AH-3,
it must be connected to the
[ANT1] connector.
INSTALLATION AND CONNECTIONS
■ Advanced connections
• Front panel
• Rear panel
16
INSTALLATION AND CONNECTIONS
3
■ 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.
CONNECTING PS-125 DC POWER SUPPLY
PS-125
DC power
Connect to an AC outlet
using the supplied AC cable.
socket
DC power cable
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
Transceiver
CONNECTING A DC POWER SUPPLY
AC outlet
AC cable
A DC power supply
13.8 V; at least 23 A
Black_Red
+
30 A fuses
CONNECTING A VEHICLE BATTERY
Grommet
to DC power
socket
Supplied
DC power cable
Transceiver
NEVER connect to
a 24 V battery.
_ black
+ red
NOTE: Use terminals for
the cable connections.
Crimp
12 V
battery
Supplied
DC power cable
Solder
NEVER connect to a battery without supplied DC fuses,
otherwise a fire hazard may occur.
17
3
INSTALLATION AND CONNECTIONS
■ Linear amplifier connections
CONNECTING THE IC-PW1
Remote control cable (supplied with the IC-PW1)
ACC cable (supplied with the IC-PW1)
INPUT1
INPUT2
1&2
GND
ANT
To an
antenna
ACC-1
REMOTE
EXCITER
1
IC-PW1
AC outlet
(Non-European versions: 100–120/220–240 V
European version : 230 V)
Use the [ANT1] connector when connecting a linear
amplifier.
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
GND
Ground
[INPUT2]
if necessary
ACC(2)
ANT1
Transceiver
REMOTE
Turn OFF the transceiver’s antenna tuner while tuning the IC-PW1’s tuner.
CONNECTING A NON-ICOM LINEAR AMPLIFIER
R WARNING:
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 transceiver does not accept positive voltage. Non-matched ALC and RF
power settings could cause a fire or
ruin the linear amplifier.
To an
antenna
RF OUTPUT RF INPUT
ALC
SEND
Non-Icom 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.
50 Ω coaxial cable
ANT1
Transceiver
ALC SEND
18
■ External antenna tuner connection
Transverter jack
Coaxial cable (from the AH-4 or AH-3)
ANT1
Control cable
Transceiver
Ground
AH-4 or AH-3
Long wire or optional AH-2b
CONNECTING THE AH-4/AH-3
The AH-4 or AH-3 must be connected to [ANT1].
INSTALLATION AND CONNECTIONS
3
■ Transverter jack information
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 activated 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.
19
3
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
INSTALLATION AND CONNECTIONS
■ FSK and AFSK (SSTV) connections
To connect a terminal unit, TNC or scan converter,
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
20
When connected to the [MIC] connector, [MIC
GAIN] and [AF] control adjustment is required.
FREQUENCY SETTING
[POWER] [M-CL]
[F-INP]
*1 FAST in FM mode.
*
2
Appears in some modes.
[POWER]: OFF
[TUNER], [MONITOR],
[NB], [NR]: OFF
[AF]: Max. CCW
[RF/SQL]: 12 o clock
[MIC GAIN]: 10—12 o clock
[RF POWER]: Max. CW
[ANT]: 1
[METER]: Po
[P.AMP]: 1
[ATT]: OFF
[PBT CLR]: OFF
[NOTCH]: OFF
[BAL]: Center [AGC]: MID*
1
[LOCK]: OFF
[COMP]*
2
: OFF WIDE;
[1/4],*
2
[TONE]*2: OFF
[VOX],*
2
[BK-IN],*
2
[RTTY FIL]*2: OFF
MN
AN
TPFTPF
DUAL-WDUAL-W
SPLITSPLIT
∂TXTX
RITRIT
■ When first applying power (CPU resetting)
Before first applying power, 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]
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 displays its initial VFO frequencies when
resetting is complete.
e Correct the set mode settings after resetting, if de-
sired.
Under cooler temperatures, the LCD may appear
dark and unstable after turning power ON. This is
normal and does not indicate any equipment malfunction.
4
■ Initial settings
After resetting the transceiver, set controls and
switches as shown in the figure below.
CW : Max. clockwise
CCW : Max. counterclockwise
Turn power ON, then check the display. If any of the
following indicators appear, turn them OFF as follows:
• Quick tuning step indicator “▼” : Push [TS].
• 1 Hz frequency readout : Push [TS] for 2 sec.
• RIT indicator “” : Push [RIT].
• ∂TX indicator “” : Push [∂TX].
• Split indicator “” : Push [SPLIT].
•Dualwatch indicator “”: Push
(while quick tuning
step is OFF)
•
•Auto notch indicator “” : Push [NOTCH].
•Manual notch indicator “”: Push [NOTCH].
[DUAL WATCH].
Twin peak filter indicator “”
: Push [RTTY FIL].
21
4
METER
Po
ANT
1
BWBW
2.4k2.4k
SFTSFT
0
VFOVFO
FIL2FIL2
USBUSB
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21.076.5021.076.50
Select
TUNING DIAL
MEMORY
CHANNEL
MODE
SWITCHES
MEMO PAD
KEYPAD
(BAND KEY)
Transfer
Transfer
Transfer
Change
21.295 MHz
28.025 MHz
7.001 MHz
METER
Po
ANT
METER
Po
ANT
METER
Po
ANT
METER
Po
ANT
BW
2.4k
SFT
VFO
FIL2
USB
TX
CW
21.076.50
BW
500
SFT
BPF
FIL2
CW
TX
VFO
USB
14.123.00
BW
2.4k
SFT
VFO
FIL2
USB
TX
CW
21.076.50
BW
2.4k
SFT
VFO
FIL2
USB
TX
CW
21.076.50
BW
2.4k
SFT
FIL2
USB
TX
VFO
USB
14.100.00
BW
2.4k
SFT
FIL2
USB
TX
VFO
USB
14.100.00
BW
2.4k
SFT
FIL2
USB
TX
VFO
USB
14.100.00
BW
2.4k
SFT
FIL2
USB
TX
VFO
USB
14.100.00
12
METER
Po
ANT
METER
Po
ANT
METER
Po
ANT
METER
Po
ANT
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-756PROII 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. 56) or the
memory transfer function (see p. 54). 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.
22
• 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]
VFO is selected.
ANT
METER
The frequency is changed.
ANT
METER
Memory mode is selected.
VFO is selected again.
ANT
METER
ANT
METER
Changed frequency (14.123 MHz) appears.
2.4k
BW
1
Po
1
Po
1
Po
1
Po
VFO
TX
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VFO
TX
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BW
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1
VFO
1
SFT
SFT
SFT
1
SFT
0
USB
21.076.50
0
USB
21.076.50
0
CW
14.123.00
0
USB
21.076.50
FIL2
FIL2
FIL2
FIL2
BPF
qw:pp
CW
qw:pp
CW
qw:pp
USB
qw:pp
CW
MEMORY MODE (pgs. 51–55)
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]
Memory channel 1 is selected.
The frequency is changed.
Another memory channel is selected.
Memory channel 1 is selected again.
ANT
METER
ANT
METER
ANT
METER
ANT
METER
2.4k
BW
1
TX
qr.qpp.pp
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2.4k
BW
1
TX
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Po
2.4k
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1
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1
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VFO
VFO
12
VFO
VFO
1
1
1
SFT
SFT
SFT
SFT
0
USB
14.100.00
0
USB
14.100.00
0
USB
14.100.00
0
USB
14.100.00
FIL2
FIL2
FIL2
FIL2
qw:pp
USB
qw:pp
USB
qw:pp
USB
qw:pp
USB
Changed frequency (14.123 MHz) does not appear and
memorized frequency (14.100 MHz) appears instead.
■ Frequency setting with the tuning dial
BWBW
2.4k2.4k
SFTSFT
0
VFOVFO
FIL2FIL2
USBUSB
qw:pp
TXTX
1
CWCW
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21.076.5021.076.50
METER
Po
ANT
1
METER
Po
ANT
1
BWBW
2.4k2.4k
SFTSFT
0
VFOVFO
FIL2FIL2
USBUSB
qw:pp
TXTX
1
CWCW
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21.076.5021.076.50
METER
Po
ANT
1
BWBW
2.4k2.4k
SFTSFT
0
VFOVFO
FIL2FIL2
USBUSB
qw:pp
TXTX
1
CWCW
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21.076.5021.076.50
METER
Po
ANT
1
BWBW
2.4k2.4k
SFTSFT
0
VFOVFO
FIL2FIL2
USBUSB
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1
CWCW
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FREQUENCY SETTING
4
• 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. 25)
If the dial lock function is activated, the lock indicator lights, and the tuning dial does
not function. In this case, push [LOCK/SPEECH] to deactivate the lock function.
• 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. 24)
e Select the desired operating mode with the mode
switch. (p. 25)
TRIPLE BAND STACKING REGISTER
[EXAMPLE]
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.
14 MHz band
Push
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.
CW
14.025.00
USB
14.195.00
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 fre-
RTTY
14.090.00
quency and the other one for an RTTY frequency.
■ Direct frequency entry with the keypad
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]
14.025 MHz
F-INP ENT
18.0725 MHz
706 kHz
5.100 MHz
7.000 MHz
21
14
5
1 04 2• 5
1F-INP
F-INP
F-INP ENT
F-INP ENT
7
14
5
08 7• 2 5
7
21 MHz band
Push
• 15
21
CW
21.025.00
USB
21.295.00
RTTY
21.090.00
7
ENT
ENT7 0• 6
21.280 21.245
F-INP ENT
2 4• 5
23
4
SCOPESCOPE
VOICEVOICE
MEMORYMEMORY
SCANSCAN
BWBW
2.4k2.4k
SFTSFT
0
FIL2FIL2
USBUSB
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1
TXTX
VFOVFO
1
USBUSB
USBUSB
USBUSB
FIL2FIL2
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14.100.0014.100.00
14.100.0014.100.00
VFOVFO
ATTATT
0FF0FF
METERMETER
PoPo
P.AMPP.AMP
1
VOXVOX
OFFOFF
COMPCOMP
OFFOFF
WIDEWIDE
AGCAGC
MIDMID
ANTANT
1
1 Hz step indicator
1/4
OFF
1/4
ON
1
⁄4 tuning step OFF
1
⁄4 tuning step ON
DEFDEF
TSTS
FMFMAMAM
1010
(kHz)(kHz)
1111
SSBSSB CWCW RTTYRTTY
VOXVOX
OFFOFF
COMPCOMP
OFFOFF
WIDEWIDE
AGCAGC
MIDMID
BWBW
2.4k2.4k
SFTSFT
0
FIL2FIL2
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TXTX
CWCW
qr.qpp.pp
21.076.5021.076.50
VFOVFO
USBUSB
1
METER
Po
ANT
1
Quick tuning indicator
FREQUENCY SETTING
■ Advanced tuning functions
QUICK TUNING STEP
The operating frequency can be changed in kHz
steps (0.1, 1, 5, 9, 10, 12.5, 20 or 25 kHz selectable)
for quick tuning.
q Push [TS] momentarily to display the quick tuning
indicator.
w Rotate the tuning dial to change the frequency in
programmed kHz steps.
e Push [TS] again to turn OFF the indicator.
r Rotate the tuning dial for normal tuning if desired.
SELECTING THE kHz STEP
q Push [TS] momentarily to turn the quick tuning
step ON.
w Push [TS] for 1 sec. to enter the quick tuning step
setting display.
• Selected tuning steps for all modes appear.
e Select the desired operating mode.
r Rotate the tuning dial to select the desired tuning
step from 0.1, 1, 5, 9, 10, 12.5, 20 or 25 kHz.
t Repeat steps e and r to select quick tuning
steps for other modes, if desired.
y Push [EXIT/SET] to exit the setting display.
SELECTING THE 1 Hz STEP
The minimum tuning step of 1 Hz can be used for fine
tuning.
q Turn OFF the quick tuning step.
•“▼” does not appear.
w Push [TS] for 1 sec. to toggle the 1 Hz tuning step
ON and OFF.
•RIT and/or ∂TX also functions in 1 Hz tuning step when
used.
1
⁄
4 TUNING STEP FUNCTION
(SSB data/CW/RTTY only)
While operating in SSB data/CW/RTTY, the
tion is available for critical tuning. Dial rotation is reduced to
➥ Push [1/4] to toggle the 1⁄4 function ON and OFF.
24
AUTO TUNING STEP FUNCTION
When rotating the tuning dial rapidly, the quick tuning
step is automatically selected by the auto tuning step
function.
1
⁄4 of normal when the 1⁄4 function is in use.
1
⁄
4 func-
The auto tuning step function can be turned OFF in
set mode (p. 72)
■ Mode selection
RECEIVE AND TRANSMIT
5
The following modes are available in the IC756PROII:
SSB (LSB/USB), CW, CW-R (CW reverse), RTTY,
RTTY-R (RTTY reverse), AM and FM. Data modes of
SSB, AM and FM are also available.
Microphone signals are muted when data mode is
selected.
To select a mode of operation, push the desired mode
switch momentarily. Push the switch again to toggle
between USB and LSB, CW/CW-R and RTTY/RTTYR, AM and FM, if necessary. Push the switch for
1 sec. to toggle between CW and CW-R, RTTY and
RTTY-R, or to select data mode, if necessary.
■ Twin PBT operation
General PBT (Passband Tuning) function electronically
narrows the IF passband width by shifting the IF frequency to slightly outside of the IF filter passband to
reject interference. This transceiver uses the DSP circuit for the PBT function. Moving both [TWIN PBT]
controls to the same position shifts the IF.
➥ The LCD shows the passband width and shift fre-
quency graphically.
➥ Push [FILTER] for 1 sec. to enter the filter set mode.
Current passband width and shift frequency is displayed in the filter set mode screen.
➥ To set the [TWIN PBT] controls to the center posi-
tions, push [PBT CLR] for 1 sec.
See the diagram below for the order of selection.
SSB
USB-D USB
CW/RTTY
CW-R CW
AM/FM
AM-D AM
Push mode switch
for 1 sec.
LSB LSB-D
RTTY RTTY-R
FM FM-D
Push mode switch
momentarily.
The variable range depends on the passband width
and mode. The edge of the variable range is half of the
passband width, and PBT is adjustable in 25 or 50 Hz
steps. These controls function as an IF shift control
while in AM mode and when the RTTY filter is turned
ON. Only the inner control may function in this case.
IF shift is adjustable in 20/40 Hz steps in RTTY (RTTY
filter is turned ON) or 150/300/500 Hz steps in AM.
•[TWIN PBT] should normally be set to the center posi-
tions (PBT setting is cleared) when there is no interference.
•When PBT is used, the audio tone may be changed.
• Not available for FM mode.
•While rotating [TWIN PBT], noise may occur. This comes
from the DSP unit and does not indicate an equipment
malfunction.
PBT OPERATION EXAMPLE
Both controls at
center position
TWIN PBT TWIN PBT
IF center frequency Interference Desired signal
Cutting a lower
passband
TWIN PBT
Passband
Cutting both higher and
lower passbands
Passband
Interference Interference
Desired signal
25
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