Icom IC-756PRO User Manual

INSTRUCTION MANUAL

HF/50 MHz

ALL MODE TRANSCEIVER

i756PRO

IMPORTANT

READ THIS INSTRUCTION MANUAL CAREFULLY before attempting to operate the transceiver.

SAVE THIS INSTRUCTION MANUAL. This manual contains important safety and operating instructions for the IC-756PRO.

EXPLICIT DEFINITIONS

	WORD	DEFINITION
	RWARNING	Personal injury, fire hazard or electric
		shock may occur.
	CAUTION	Equipment damage may occur.
		If disregarded, inconvenience only.
	NOTE
		No risk of personal injury, fire or
		electric shock.

PRECAUTIONS

RWARNING HIGH VOLTAGE! NEVER attach 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 +60°C (+140°F). Be aware that temperatures on a vehicle’s dashboard can exceed 80°C (+176°F), resulting in permanent damage to the transceiver if left there for extended periods.

AVOID placing the transceiver in excessively dusty environments or in direct sunlight.

AVOID placing the transceiver against walls or putting anything on top of the transceiver. This will obstruct heat dissipation.

Place unit in a secure place to avoid inadvertent use by children.

During mobile operation, DO NOT operate the transceiver without running the vehicle’s engine. When transceiver power is ON and your vehicle’s engine is OFF, the vehicle’s battery will soon become exhausted.

Make sure the transceiver power is OFF before starting the vehicle. This will avoid possible damage to the transceiver by ignition voltage spikes.

During maritime mobile operation, keep the transceiver and microphone as far away as possible from the magnetic navigation compass to 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-756PRO may damage the transceiver.

	Spurious may be received near the following frequencies.
Versions of the IC-756PRO which display the “CE”	These are made in the internal circuit and does not indicate a
symbol on the serial number seal, comply with the	transceiver malfunction:

European harmonised standard ETS300 684	6.144 MHz, 8.000 MHz,
(EMC product standard for Commercially Available	12.288	MHz, 12.890 MHz (when spectrum scope is ON),
Amateur Radio Equipment).	18.433	MHz, 24.573 MHz

i

TABLE OF CONTENTS 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 – 21
	■ Unpacking ....................................	14
	■ Selecting a location ......................	14
	■ Grounding .....................................	14
	■ Antenna connection .....................	14
	■ Required connections ...................	15
	■ Advanced connections .................	16
	■ Power supply connections ............	17
	■ Linear amplifier connections .........	18
	■ Transverter jack information .........	19
	■ External antenna selector or
	antenna tuner connections ...........	20
	■ FSK and AFSK (SSTV)
	connections ..................................	21
4	FREQUENCY SETTING .......	22 – 25
	■ When first applying power
	(CPU resetting) .............................	22
	■ Initial settings ................................	22
	■ VFO description ............................	23
	■ Frequency setting with the
	tuning dial .....................................	24
	■ Direct frequency entry with
	the keypad ....................................	24
	■ Advanced tuning functions ...........	25

5	RECEIVE AND TRANSMIT .. 26 – 49
	■ Mode selection .............................	26
	■ Twin PBT operation ......................	26
	■ Notch function ..............................	27
	■ Noise reduction ............................	27
	■ Noise blanker ...............................	27
	■ RTTY filter/Twin peak filter ...........	28
	■ CW reverse mode .........................	28
	■ RTTY reverse mode .....................	28
	■ CW pitch control ...........................	29
	■ IF filter selection ...........................	29
	■ AGC function ................................	30
	■ Dualwatch operation .....................	31
	■ Split frequency operation ..............	32
	■ Quick split function .......................	33
	■ RIT and ∂TX ................................	34
	■ Monitor function ............................	35
	■ VOX function .................................	35
	■ Meter function ...............................	36
	■ SWR reading ................................	36
	■ Speech compressor .....................	37
	■ Digital voice recorder ....................	38
	■ RTTY decoder ..............................	41
	■ RTTY tuning meter .......................	41
	■ Electronic CW keyer .....................	42
	■ Memory keyer ...............................	43
	■ Spectrum scope screen ...............	44
	■ Automatic antenna selection ........	45
	■ Dial lock function ..........................	45
	■ Repeater operation .......................	46
	■ Tone squelch operation ................	47
	■ Antenna tuner operation ...............	48
	■ Optional external tuner
	operation ......................................	49
6	MEMORY OPERATION ........	50 – 55
	■ Memory channels .........................	50
	■ Memory channel selection ...........	50
	■ Memory channel screen ...............	51
	■ Memory channel programming ..... 52
	■ Frequency transferring .................	53
	■ Memory names ............................	54
	■ Memory clearing ...........................	54
	■ Memo pads ...................................	55
7	SCANS .................................	56 – 61
	■ Scan types ....................................	56
	■ Preparation ...................................	56
	■ Programmed scan operation ........	57

	■ ∂F scan operation ........................		57
	■ Fine programmed scan/
	fine ∂F scan .................................		58
	■ Memory scan operation ................		58
	■ Select memory scan operation .....		59
	■ Setting select memory channels ..		59
	■ Scan set mode .............................		60
	■ Tone scan .....................................		61
8	CLOCK AND TIMERS ..........	62 – 63
	■ Setting the current time ................		62
	■ Setting power-on time ..................		62
	■ Setting power-off period ...............		63
	■ Timer operation ............................		63
9	SET MODE ...........................	64 – 72
	■ Set mode description ...................		64
	■ Level set mode .............................		65
	■ Display set mode ..........................		66
	■ Timer set mode ............................		67
	■ Miscellaneous (others) set mode ..		68
10	OPTION INSTALLATION ............		73
	■ Opening the transceiver’s case ....		73
	■ UT-102 VOICE SYNTHESIZER
	UNIT ..............................................		73
11	MAINTENANCE ...................	74 – 76
	■ Troubleshooting ............................		74
	■ Fuse replacement .........................		75
	■ Clock backup battery
	replacement ..................................		75
	■ Tuning dial brake adjustment ........		76
	■ Frequency calibration
	(approximate) ................................		76
12	INTERNAL VIEWS ......................		77
13	CONTROL COMMAND ........	78 – 79
	■ Remote jack (CI-V) information ....		78
14	SPECIFICATIONS .......................		80
15	OPTIONS .....................................		81

SUPPLIED ACCESSORIES

The transceiver comes with the following accessories.		q	w	e	r
	Qty.
q DC power cable (OPC-025D)	............................ 1
w Hand microphone (HM-36) ................................	1
e Spare fuses (FGB 30 A) ....................................	2
r Spare fuse (FGB 5 A) ........................................	1
t CW keyer plug (AP-330) ....................................	1			t

1

2 PANEL DESCRIPTION

■ Front panel

!6 !5 !4!3 !2

TIMER

HF/50MHz TRANSCEIVER

q

POWER

TRANSMIT
w
		i756PRO
PHONES	TUNER MONITOR	NB	NR
e
ELEC-KEY	AF RF/SQL	BAL	NR
r
MIC
t
	MIC GAIN RF POWER		COMP KEY SPEED BK-IN DELAY

y uio !0 !1

qPOWER SWITCH [POWER/TIMER]

Push momentarily to turn power ON.

•Turn the optional DC power supply ON in advance.

•A/D convertor calibration of the DSP unit starts and it takes 10 sec.

F-1	F-2	F-3	F-4	F-5
SSB	CW/RTTY	AM/FM	FILTER	EXIT

(dot)

(com)

(dash)

Push momentarily to toggle the timer function ON and OFF. (p. 63)

•The power switch lights while the timer function is ON.

Push for 2 sec. to turn power OFF.

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.

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.

tMICROPHONE CONNECTOR [MIC]

Accepts the supplied or optional microphone.

•See p. 81 for appropriate microphones.

•See p. 9 for microphone connector information.

yAF CONTROL [AF] (inner control)

Varies the audio output level from the speaker.

AF	RF/SQL
Decreases	Increases
No audio output	Max. audio output

uMIC GAIN CONTROL [MIC GAIN]

Adjusts microphone input gain.

rELECTRONIC KEYER JACK [ELEC-KEY] (p. 42) Accepts a paddle to activate the internal electronic keyer for CW operation.

•Selection between the internal electronic keyer, bug-key and straight key operation can be made in keyer set mode. (p. 42)

•A straight key jack is separately available on the rear panel. See [KEY] on p. 12.

•Keyer polarity (dot and dash) can be reversed in keyer set mode. (p. 42)

•4-channel memory keyer is available for your convenience. (p. 43)

•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.

Recommended level for an Icom microphone

Decreases Increases

MIC GAIN

2

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 received.

•The squelch is particularly effective for FM. It is also available for other modes.

•12 to 1 o’clock position is recommended for any setting of the [RF/SQL] control.

•The control can be set as ‘Auto’ (RF gain control in SSB, CW and RTTY; squelch control in AM and FM) or squelch control (RF gain is fixed at maximum) in set mode as follows. (p. 68)

	MODE	SET MODE SETTING
		AUTO	SQL	RF GAIN + SQL
	SSB, CW	RF GAIN	SQL	RF GAIN + SQL
	RTTY
	AM, FM	SQL	SQL	RF GAIN + SQL

• When setting as RF gain/squelch control

	Noise squelch (FM mode)
Squelch is	Recommended level
open.	Maximum
	RF gain
RF gain
adjustable	S-meter
range	squelch

PANEL DESCRIPTION 2

oRF 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

Decreases Increases

RF POWER

!0BALANCE CONTROL [BAL] (inner control; p. 31) Adjusts the audio output balance between main and sub readout frequencies while in dualwatch.

BAL	NR
Increases main	Increases sub
readout gain	readout gain

!1NOISE REDUCTION LEVEL CONTROL [NR]

(outer control; p. 27)

Adjusts the noise reduction level when the noise reduction is in use. Set for maximum readability.

BAL	NR
Decreases	Increases

OFF

!2NOISE REDUCTION SWITCH [NR] (p. 27) Toggles the noise reduction ON and OFF.

NR	NR
Noise reduction OFF	Noise reduction ON

•When functioning as RF gain control

(Squelch is fixed open; SSB, CW, RTTY only)

Maximum

RF gain

Adjustable range

Minimum RF gain

•When functioning as squelch control

(RF gain is fixed at maximum.)

	Noise squelch Noise squelch (FM mode)
	threshold	S-meter squelch
	(FM mode)
		threshold
	Squelch is	S-meter

open.	squelch

Shallow Deep

While rotating the RF gain control, noise may be heard. This comes from the DSP unit and does not indicate an equipment malfunction.

!3NOISE BLANKER SWITCH [NB] (p. 27)

Toggles the noise blanker ON and OFF. The noise blanker reduces pulse-type noise such as that generated by automobile ignition systems. This function cannot be used for FM, or non-pulse-type noise.

NB	NB
Noise blanker OFF	Noise blanker ON

!4S/RF METER (p. 36)

Shows the signal strength while receiving. Shows the relative output power, SWR, ALC or compression levels while transmitting.

!5MONITOR SWITCH [MONITOR] (p. 35)

Monitors your transmitted IF signal.

•The CW sidetone functions when [MONITOR] is OFF in CW mode.

!6ANTENNA TUNER SWITCH [TUNER] (p. 48)

Turns the antenna tuner ON and OFF (bypass) when pushed momentarily.

Starts to tune the antenna manually when pushed for 2 sec.

•When the tuner cannot tune the antenna, the tuning circuit is bypassed automatically after 20 sec.

3

2 PANEL DESCRIPTION

■ Front panel (continued)

EIVER

i756PRO

NB NR

BALNR

@9

@8@7@6
							TWIN PBT
SPLIT	1.8	1	3.5	2	7	3	Y
DUAL	10	4	14	5	18	6	Z
WATCH
CHANGE	21	7	24	8	28	9	MW
							PBT CLR	NOTCH
	GENE •		50	0	F-INPENT		M-CL

VFO/

MEMO

MP-W	MP-R	NOTCH CW PITCH
		TS

MAIN/

SUB

RX	XFC
TX	LOCK

RIT

TX CLEAR

RIT/ TX

F-1

F-2

F-3

F-4

F-5

	SSB	CW/RTTY	AM/FM	FILTER	EXIT
COMP	KEY SPEED BK-IN DELAY

!7 !8 !9

@0

@1@2 @3

SPEECH

LOCK

@4 @5

!7COMPRESSION LEVEL CONTROL [COMP]

(p. 37)

Adjusts the speech compression level in SSB.

Compression	Compression
level decreases	level increases
	COMP

!8ELECTRONIC CW KEYER SPEED CONTROL [KEY SPEED] (p. 42)

Adjusts the internal electronic CW keyer’s speed.

• 6 wpm (min.) to 60 wpm (max.) can be set.

Slow

Fast

KEY SPEED

!9SEMI BREAK-IN DELAY CONTROL [BK-IN DELAY]

Adjusts the transmit-to-receive switching delay time for CW semi break-in operation.

Short delay for		Long delay for
high speed keying		slow speed keying
(2 dot)	BK-IN DELAY (13 dot)

@0MODE SWITCHES

Selects the desired mode. (p. 26)

• Announces the selected mode when an optional UT-102 is installed. (pgs. 71, 73)

Selects USB and LSB mode alternately.

Toggles SSB and SSB data mode (USB-

SSB

D, LSB-D) when pushed for 2 sec.

Selects CW and RTTY mode alternately.

CW/RTTY Toggles CW and CW-R (CW reverse) mode when pushed for 2 sec. in CW

mode.

Toggles RTTY and RTTY-R (RTTY re- CW/RTTY verse) mode when pushed for 2 sec. in

RTTY mode.

Selects AM and FM mode alternately. AM/FM Toggles AM/FM and AM/FM data mode

(AM-D, FM-D) when pushed for 2 sec.

@1LCD 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.

@2FILTER SWITCH [FILTER]

Selects one of 3 IF filter settings.

Enters the filter set mode when pushed for 2 sec.

@3EXIT SWITCH [EXIT]

Exits from a set mode, etc. when pushed.

@4SPEECH SWITCH [SPEECH] (pgs. 71, 73) Announces the selected readout frequency when an optional UT-102 is installed.

@5TUNING DIAL (p. 24)

Changes the displayed frequency, selects set mode items, etc.

@6MAIN/SUB SWITCH [MAIN/SUB]

Selects the main or sub readout for access.

•The sub readout frequency is displayed in outline or mesh font. The sub readout functions only during split operation or dualwatch.

@7VFO/MEMORY SWITCH [VFO/MEMO]

Toggles the selected readout operating mode between the VFO mode and memory mode when pushed. (pgs. 23, 50)

Transfers the memory contents to VFO when pushed for 2 sec. (p. 53)

4

@8MAIN/SUB CHANGE SWITCH [CHANGE]

Toggles the frequency and selected memory channel between main and sub readouts when pushed.

•Toggles between transmit frequency and receive frequency when the split frequency function is ON. (p. 32)

Equalizes the sub readout frequency to the main readout frequency when pushed for 2 sec.

@9MULTI-FUNCTION SWITCHES

Push to select the functions indicated in the LCD display to the right of these switches.

•Functions vary depending on the operating condition.

Toggles the antenna connector selection between ANT1/R and ANT2/R when

	pushed. (p. 45)
ANT	Toggles the [RX ANT] (receive antenna)
1
	ON and OFF when pushed for 2 sec.
	When a transverter is in use, this [ANT]
	does not function and ‘TRV’ appears.
	Selects RF power (Po), ALC, SWR or
	COMP metering during transmit. (p. 36)
METER
Po	Toggles the multi-function digital meter
	ON and OFF when pushed for 2 sec.

Selects one of 2 receive RF preamps or bypasses them.

	•“P. AMP1” activates 10 dB preamp for HF all
P.AMP
OFF	bands.
	•“P. AMP2” activates 16 dB high-gain preamp
	for 21 MHz band and above.

What is the preamp?

The preamp amplifies received signals in the front end circuit to improve the S/N ratio and sensitivity. Select “P. AMP1” or “P. AMP2” when receiving weak signals.

	ATT	Selects 6 dB, 12 dB or 18 dB attenuator,
		or bypasses them.
	OFF

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.
	AGC	•“FAST” is only available for FM mode.
	MID
		Enters the AGC set mode when pushed
		for 2 sec.

AGC time constant can be set between 0.1 to 8.0 sec. (depends on mode), or turned OFF. While “OFF” is selected, the S-meter does not function.

PANEL DESCRIPTION 2

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

	VOX	when pushed in non-CW modes. (p. 35)
		Enters the VOX set mode when pushed
	OFF
		for 2 sec. in non-CW modes. (p. 35)

What is the VOX function?

The VOX function (voice operated transmission) starts transmission without pushing the transmit switch or PTT switch when you speak into the microphone; then, automatically returns to receive when you stop speaking.

Selects semi break-in, full break-in oper-

BK-IN ation, or turns the break-in operation

OFF

OFF when pushed in CW mode.

What is the break-in function?

The break-in function toggles transmit and receive with CW keying. Full break-in (QSK) can monitor the receive signal during keying.

Turns the RTTY filter ON and OFF in RTTY mode. (p. 28)

	RTTY	• When the RTTY filter is turned ON, [TWIN
	FIL
		PBT] functions as the IF shift control.
	OFF

Enters the RTTY filter set mode when pushed for 2 sec. in RTTY mode. (p. 28)

What is the IF shift?

The IF shift function electronically changes the center of the IF (Intermediate Frequency) passband frequency to reject interference. Only the inner control of [TWIN PBT] can be used for the IF shift control.

Turns the speech compressor ON and

	COMP	OFF in SSB mode. (p. 37)
	OFF	Toggles the narrow, middle or wide trans-
	WIDE
		mit filter when pushed for 2 sec.

What is the speech compressor?

The speech compressor compresses the transmitter audio input to increase the average audio output level. Therefore, talk power is increased. This function is effective for long distance communication or when propagation conditions are poor.

		Turns the 1⁄4 function ON and OFF in CW
	1/4	and RTTY modes. (p. 25)
		• 1⁄4 function sets dial rotation to 1⁄4 of normal
	OFF
		for fine tuning.

Toggles the tone encoder, tone squelch function and no tone operation when

TONE	pushed in FM mode. (pgs. 46, 47)

Enters the tone set mode when pushed for 2 sec. in FM mode. (pgs. 46, 47)

5

2 PANEL DESCRIPTION

■ Front panel (continued)

CEIVER

i756PRO

NB NR

BALNR

F-1	F-2	F-3	F-4
SSB	CW/RTTY	AM/FM	FILTER

COMP KEY SPEED BK-IN DELAY

@8LOCK SWITCH [LOCK] (p. 45)

Turns the dial lock function ON and OFF.

@9RIT/∂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).

	RIT/∂TX
Low shift	High shift

#0RIT 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 frequency when pushed for 2 sec.

What is the RIT function?

The RIT (Receiver Incremental Tuning) shifts the receive frequency without shifting the transmit frequency.

This is useful for fine tuning stations calling you on an off-fre- quency or when you prefer to listen to slightly differentsounding voice characteristics, etc.

#1∂TX SWITCH [∂TX] (p. 34)

Turns the ∂TX function ON and OFF when pushed.

•Use the [RIT/∂TX] control to vary the ∂TX frequency.

$5	$$43$2$1			$0 #9 #8 #7
								TWIN PBT
	SPLIT	1.8	1	3.5	2	7	3	Y
	DUAL	10	4	14	5	18	6	Z
	WATCH

21	7	24	8	28	9	MW
CHANGE						PBT CLR	NOTCH
VFO/								#6
		50	0	F-INPENT		M-CL
GENE •
MEMO	MP-W			MP-R		TS	CW PITCH	#5
						NOTCH
MAIN/
SUB								#4
RX						XFC
TX						LOCK		#3
						RIT	TX CLEAR
								#2
						RIT/ TX		#1
								#0
F-5
SPEECH						LOCK

EXIT

@8 @9

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.

#2CLEAR SWITCH [CLEAR] (p. 34)

Clears the RIT/∂TX shift frequency when pushed for 2 sec.

#3CW PITCH CONTROL [CW PITCH]

(outer control; p. 29)

Shifts the received CW audio pitch and monitored CW audio pitch without changing the operating frequency.

NOTCH	CW PITCH
Lower frequency	Higher frequency
Approx. 300 Hz	Approx. 900 Hz

#4MANUAL NOTCH FILTER CONTROL [NOTCH]

(inner control; p. 27)

Varies the peak frequency of the manual notch filter 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

Adds the ∂TX shift frequency to the operating fre-

quency when pushed for 2 sec.

6

#5PBT CLEAR SWITCH [PBT CLR] (p. 26) Clears the PBT settings when pushed for 2 sec.

• The [PBT CLR] indicator appears when PBT is in use.

#6NOTCH SWITCH [NOTCH] (p. 27)

Toggles the notch function between auto, manual and OFF in SSB and AM modes.

Turns the manual notch function ON and OFF when pushed in CW mode.

Turns the auto notch function ON and OFF when pushed in FM mode.

•“AN” appears when auto notch is in use.

•“MN” appears when manual notch is in use.

What is the notch function?

The notch function eliminates unwanted CW or AM carrier tones while preserving the desired signal’s audio response. The filtering frequency is adjusted to effectively eliminate unwanted tones via the DSP circuit.

NOTCH	NOTCH
Notch OFF	Notch ON

#7PASSBAND TUNING CONTROLS [TWIN PBT]

Adjust the receiver’s “passband width” of the DSP filter. (p. 26)

•Passband width and shift frequency are displayed in the LCD.

•Push [PBT CLR] for 2 sec. to clear the settings when not in use.

•Variable range is set to the half of the IF filter passband width. 25 Hz steps and 50 Hz steps are available.

•These controls function as an IF shift control while in AM mode and when the RTTY filter is turned ON. Only the inner control may function in this case.

What is the PBT control?

General PBT function electronically narrows the IF passband width to reject interference. This transceiver uses the DSP circuit for the PBT function.

TWIN PBT

		PBT2
TWIN PBT	TWIN PBT	TWIN PBT
–		+

Low cut

Center

High cut

#8LOCK INDICATOR [LOCK] (p. 45)

Lights when the dial lock function is activated.

PANEL DESCRIPTION 2

#9MEMO PAD-READ SWITCH [MP-R] (p. 55)

Each push calls up a frequency and operating mode in a memo pad. The 5 (or 10) most recently programmed frequencies and operating modes can be recalled, starting from the most recent.

•The memo pad capacity can be expanded from 5 to 10 in set mode for your convenience. (p. 71)

$0KEYPAD

Pushing a key selects the operating band.

•[GENE] selects the general coverage band.

Pushing the same key 2 or 3 times calls up other stacked frequencies in the band. (p. 24)

•Icom’s triple band stacking register 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. 24, 50)

•e.g. to enter 14.195 MHz, push [F-INP] [1] [4] [•] [1] [9] [5] [(F-INP)ENT].

$1MEMO PAD-WRITE SWITCH [MP-W] (p. 55) Programs the selected readout frequency and operating mode into a memo pad.

•The 5 most recent entries remain in memo pads.

•The transmit frequency is programmed when pushed together with [XFC].

•The memo pad capacity can be expanded from 5 to 10 in set mode for your convenience. (p. 71)

$2DUALWATCH SWITCH [DUALWATCH] (p. 31)

Turns the dualwatch function ON and OFF when pushed.

Turns the dualwatch function ON and equalizes the sub readout frequency to the main readout when pushed for 2 sec. (Quick dualwatch function)

•The quick dualwatch function can be turned OFF using set mode. (p. 68)

$3SPLIT SWITCH [SPLIT] (p. 32)

Turns the split function ON and OFF when pushed.

Turns the split function ON, equalizes the sub readout frequency to the main readout and sets the sub readout for frequency input when pushed for 2 sec. in non-FM modes. (Quick split function)

•The offset frequency is shifted from the main readout frequency in FM mode. (pgs. 46, 69)

•The quick split function can be turned OFF using set mode. (p. 68)

Turns the split function ON and shifts the sub readout frequency after inputting an offset (±4 MHz in 1 kHz steps).

$4RECEIVE INDICATOR [RX]

Lights green while receiving a signal and when the squelch is open.

$5TRANSMIT INDICATOR [TX]
Lights red while transmitting.	7

2 PANEL DESCRIPTION

■ Front panel (continued)

$6							$7$8$9%0%1
EIVER							TWIN PBT
SPLIT	1.8	1	3.5	2	7	3	Y
DUAL	10	4	14	5	18	6	Z
WATCH
CHANGE	21	7	24	8	28	9	MW

PBT CLR

NOTCH

	GENE •	50	0	F-INPENT	M-CL
	VFO/
i756PRO	MEMO				NOTCH	CW PITCH
	MP-W			MP-R
					TS

NB	NR	MAIN/
		SUB

	RX	XFC
BAL	TX	LOCK
	NR

RIT

TX CLEAR

RIT/ TX

F-1	F-2	F-3	F-4	F-5
				SPEECH	LOCK
SSB	CW/RTTY	AM/FM	FILTER	EXIT

COMP KEY SPEED BK-IN DELAY

$6LCD FUNCTION DISPLAY (See p. 10 for details.) Shows the operating frequency, function switch menus, spectrum screen, memory channel screen, set mode settings, etc.

$7MEMORY UP/DOWN SWITCHES [Y]/[Z] (p. 50)

Select the memory channel number for the selected 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.

$8MEMORY WRITE SWITCH [MW] (p. 52)

Stores the selected readout frequency and operating mode into the displayed memory channel when pushed for 2 sec.

•This function is available both in VFO and memory modes.

$9MEMORY CLEAR SWITCH [M-CL] (p. 54)

Clears the selected readout memory channel contents when pushed for 2 sec. in memory mode.

•The channel becomes a blank channel.

•This switch does not function in VFO mode.

%0QUICK TUNING SWITCH [TS] (p. 25)

Turns the quick tuning step ON and OFF.

•While the quick tuning indicator is displayed, the frequency can be changed in programmed kHz steps.

•0.1, 1, 5, 9, 10, 12.5, 20 and 25 kHz quick tuning steps are available.

					Quick tuning indicator
	ANT	BW 2.4k		SFT 0				qw:pp
	1
		TX VFO			USB FIL2
			qr≥qpp≥pp
	METER
	Po	1			21.076.50			CW

While the quick tuning step is OFF, turns the 1 Hz step ON and OFF when pushed for 2 sec.

•1 Hz indications appear in both readouts and the frequency can be changed in 1 Hz steps.

While the quick tuning step is ON, enters the quick tuning step set mode when pushed for 2 sec.

%1TRANSMIT 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)

8

PANEL DESCRIPTION 2

■ Microphone (HM-36)

q

w

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. 42)

• MICROPHONE CONNECTOR

(Front panel view)

	i Main readout AF output
	(varies with [AF]/[BAL])
q Microphone input	u GND
	(Microphone ground)
w +8 V DC output	y GND (PTT ground)
e Frequency up/down	t PTT
	r Main readout squelch switch

wPTT SWITCH

Push and hold to transmit; release to receive.

	[MIC]	FUNCTION	DESCRIPTION
	PIN NO.
	w	+8 V DC output	Max. 10 mA
	e	Frequency up	Ground
		Frequency down	Ground through 470 Ω
	r	Squelch open	“LOW” level
		Squelch closed	“HIGH” level

CAUTION: DO NOT short pin 2 to ground as this can damage the internal 8 V regulator.

• HM-36 SCHEMATIC DIAGRAM

	MICROPHONE		MICROPHONE CABLE	MICROPHONE PLUG
	10	+	2k
		4700p
			+
MIC			0.33
ELEMENT			4700p
				q	u
				w	i y
		DOWN	UP	e r t
PTT	RECEIVE		470

TRANSMIT

9

2 PANEL DESCRIPTION

■ LCD display

			!6 !5!4!3!2 !1 !0		o
	ANT	BW	S	qw pp
	1
q
			VFO	SB IL2
w	METER		qr≥qqy≥pp			i
	Po					u
e			1ß	21.085.00 CW
	P.AMP		56ß USB FIL2
w	1
	ATT		qr≥qpp≥pp			i
	OFF		VFO 21.085.00 C			u
	AGC		-12.5k	SPECTRUM SCOPE	+12.5k

Grid

r10kMID

	10dB
VOX	y
OFF

SUB

COMP MARKER

OFF

WIDE

SPAN

ATT

MARKER

HOLD

SET

t

qTX INDICATOR

Indicates the frequency readout for transmit.

wVFO/MEMORY CHANNEL INDICATOR

(pgs. 23, 50)

Indicates the VFO mode or selected memory channel number.

eSELECT MEMORY CHANNEL INDICATOR

(p. 59)

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 filter selection or set modes, etc.

uMEMORY CHANNEL READOUTS (p. 50)

Show the selected memory channel contents in VFO mode.

Show the VFO contents in memory mode.

iFREQUENCY READOUTS (p. 24) Show the operating frequency.

• Outline characters are used for non-accessing readout.

oCLOCK READOUT (p. 62) Shows the current time.

!0RTTY TUNING INDICATOR (p. 41) Shows the tuning level in RTTY mode.

!1QUICK TUNING INDICATOR (p. 25)

Appears when the quick tuning step function is in use.

!2PASSBAND WIDTH INDICATOR (p. 26) Graphically displays the passband width for twin PBT operation and center frequency for IF shift operation.

!3IF FILTER INDICATOR (p. 29) Shows the selected IF filter number.

!4SHIFT FREQUENCY INDICATOR (p. 26) Shows the shift frequency of the IF filter.

!5MODE INDICATOR (p. 26)

Shows the selected mode.

!6BAND WIDTH INDICATOR (p. 29) Shows the passband width of the IF filter.

10

■ Screen menu arrangement

The following screens can be selected from the start up screen. Choose the desired screen using the following chart.

•Start up screen

ANT	BW	2.4k SFT		0			qw:pp
1
	TX	VFO		USB		FIL2

METER	qr≥qpp≥pp
Po	1	--. ---. -- CW
P.AMP
1	VFO	USB FIL2
	qr≥qpp≥pp
ATT
OFF	1	--. ---. -- CW
AGC
MID

VOX

OFF

COMP

OFF

WIDE

SCOPE

VOICE

MEMORY

SCAN

SET

F - 1

F - 2

F - 3

F - 4

F - 5

PANEL DESCRIPTION 2

Pushing [EXIT] one or more times returns to the start up screen. See p. 64 for set mode arrangement.

•Spectrum scope screen (p. 44)

AGC	-12. 5k	SPECTRUM SCOPE	+12. 5k
	Grid
MID
	2.5k
	10dB
VOX
OFF

COMP

OFF

WIDE

SPAN

ATT

MARKER

HOLD

SET

F - 1

•Voice recorder screen (p. 38)

AGC

VOICE RECORDER

MID

VOICE

RECORDER

MENU

PLAY

TX

15sec. x

4ch

VOX

RX

15sec. x

4ch

OFF

MIC

REC

Mic Record/Record check

COMP

TX

LEV.

Recorder Output Adjust

OFF

WIDE

SET

Auto Monitor SET

PLAY

MIC REC

TX LEV.

SET

F - 2

•Programmed scan screen (p. 57)

•Memory keyer screen (p. 42)

AGC

SCAN

AGC

MEMORY KEYER

MID

MID

MEMORY KEYER MENU

SEND

Max.54

Characters

x

4ch

VOX

BK-IN

OFF

∂ F S p a n

: ± 1 0 k H z

OFF

EDIT

Memory

Editor

001

001 Style Contest

Number

COMP

P r o g r a m m e d P 1 : 0 . 5 0 0 . 0 0 M H z

1/4

OFF

CW KEY

Memo-key,Elec-key,CW

Wave Form Set

s c a n e d g e s

P 2 : 2 9 . 9 9 9 . 9 9 M H z

OFF

WIDE

PROG

∂F

FINE

∂F SPAN

SET

SEND

EDIT

001

CW KEY

F - 4 F - 2

•Memory channel scan screen (p. 58)

AGC			SCAN
MID
VOX
OFF		∂ F S p a n	: ± 1 0 k H z
COMP		P r o g r a m m e d P 1 : 0 . 5 0 0 . 0 0 M H z
OFF
		s c a n e d g e s P 2 : 2 9 . 9 9 9 . 9 9 M H z
WIDE

MEMO

∂F

SELECT

∂F SPAN

SET

F - 4

•RTTY decoder screen (p. 41)

AGC		RTTY DECODE
MID		**** RTTY Decode Monitor ****
		45bps BAUDOT Mark=2125, Shift=170
RTTY		UnShift On Space support (SET-OTHERS)
FIL		New Line Code selectable (SET-OTHERS)
ON		If RTTY-FIL is OFF, Please turn ON.
		--------------------------------------------
1/4
OFF		THRESHOLD					9

HOLD

CLR

ADJ

WIDE

F - 2

•Set mode screen (p. 64)

•Memory channel screen (p. 51)

AGC

SET MODE

AGC

M E M O R Y

MID

SET MODE

MENU

MID

9 9

- - . - - - . - - - - - - - - - - -

LEVEL

TX Tone,Monitor,Side Tone

etc

P 1 0 0 . 5 0 0 . 0 0 L S B

F L 2

S C A N E D G E

VOX

VOX

P 2 2 9 . 9 9 9 . 9 9 U S B

F L 2

S C A N E D G E

OFF

DISP

Bright,Contrast,Style,Font

etc

OFF

1

- - . - - - . - - - - - - - - - - -

TIME

Clock/Timer

2

- - . - - - . - - - - - - - - - - -

COMP

COMP

3

- - . - - - . - -

- - - - - - - - -

OFF

OTHERS

Other Set Mode

OFF

4

- - . - - - . - -

- - - - - - - - -

WIDE

WIDE

LEVEL

DISP

TIME

OTHERS

ROLL

SET

SELECT

NAME

WIDE

F - 5 F - 3

11

2 PANEL DESCRIPTION

■ Rear panel

!4

!3

!2

!1

q w

e

qRECEIVE ANTENNA CONNECTOR [RX ANT]

(p. 16)

Connects a 50 Ω general coverage antenna with an RCA connector.

wTRANSVERTER JACK [XVERT] (p. 19)

External transverter input/output jack. Activated by voltage applied to [ACC(2)] pin 6.

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.

r ACCESSORY 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 1⁄4 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. 42)

(+)

(_)

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.

r t y u i o !0

uCI-V REMOTE CONTROL JACK [REMOTE]

(p. 16)

Designed for use with a personal computer for remote control of transceiver functions.

Used for transceive operation with another Icom CI-V transceiver or receiver.

iEXTERNAL SPEAKER JACK [EXT SP]

(pgs. 16, 81)

Accepts an 4–8 Ω speaker.

oALC INPUT JACK [ALC] (p. 19)

Connects to the ALC output jack of a non-Icom linear amplifier.

!0SEND CONTROL JACK [SEND] (p. 19)

Goes to ground while transmitting to control external equipment such as a linear amplifier.

• Max. control level: 16 V DC/2 A

!1DC POWER SOCKET [DC 13.8V] (p. 15)

Accepts 13.8 V DC through the supplied DC power cable (OPC-025D).

Rear panel _	+
view

12

!2ANTENNA CONNECTOR 1 [ANT1] !3ANTENNA 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 AUTOMATIC ANTENNA TUNER or AH-3 HF AUTOMATIC ANTENNA 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.

PANEL DESCRIPTION 2

!4GROUND TERMINAL [GND] (pgs. 14, 15) Connect this terminal to a ground to prevent electrical shocks, TVI, BCI and other problems.

DACC SOCKETS

ACC(1)			PIN NO.	PIN NAME	DESCRIPTION	SPECIFICATIONS
			1			“HIGH” level	: More than 2.4 V
				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	2 5				Modulator input.	Input impedance	: 10 kΩ
			4	MOD
1		3			Connects to a modulator.	Input level	: Approx. 100 mV rms
	8
6
	7				AF detector output.	Output impedance	: 4.7 kΩ
			5	AF	Fixed, regardless of [AF] position in	Output level	: 100 to 300 mV rms
Rear panel					default settings. (see notes below)
view					Squelch output.	Squelch open	: Less than 0.3 V/5 mA
			6	SQLS	Goes to ground when squelch	Squelch closed	: More than 6.0 V/100 µA
					opens.
						Output current	: Max. 1 A
			7	13.8 V	13.8 V output when power is ON.
						Connected in parallel with ACC(2) pin 7.
						Control voltage	: –4 to 0 V
			8	ALC	ALC voltage input.	Input impedance	: More than 10 kΩ
						Connected in parallel with ACC(2) pin 5.

ACC(2)			PIN NO.	PIN 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.
	2
4		5	3	SEND	Same as ACC(1) pin 3.
1		3			Band voltage output.
6		7	4	BAND			Output voltage	: 0 to 8.0 V
					(Varies with amateur band)
Rear panel			5	ALC	Same as ACC(1) pin 8.
view					Activates [XVERT] input/output		Input impedance	: More than 10 kΩ
			6	TRV
					when “HIGH” voltage is applied.		Input voltage	: 2 to 13.8 V
			7	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

■ Antenna connection

After unpacking, immediately report any damage to the delivering carrier or dealer. Keep the shipping cartons.

For a description and a diagram of accessory equipment included with the IC-756PRO, see ‘Supplied 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.

■ 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.

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					30 mm
Coupling ring				10 mm (soft solder)
w				10 mm			Soft
							solder
					1–2 mm

Slide the coupling ring down. Strip the cable jacket and soft solder.

Strip the cable as shown at left. Soft solder the center conductor.

e	solder	solder
		Slide	the	connector
		body on and solder it.
r		Screw	the	coupling
		ring	onto		the
		connector body.

30 mm ≈ 9⁄8 in 10 mm ≈ 3⁄8 in 1–2 mm ≈ 1⁄16 in

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-756PRO has an SWR meter to monitor the antenna SWR continuously.

14

INSTALLATION AND CONNECTIONS 3

■ Required connections

• Front panel

CW KEY

A straight key can be used when the internal electronic keyer is turned OFF in keyer set mode. (p. 42)

TIMER

HF/50MHz TRANSCEIVER

TWIN PBT

POWER

SPLIT

1.8

1

3.5

2

7

3

Y

DUAL

10

4

14

5

18

6

Z

TRANSMIT

WATCH

CHANGE

21

7

24

8

28

9

MW

PBT CLR

NOTCH

VFO/

GENE •

50

0

F-INPENT

M-CL

i756PRO

MEMO

NOTCH CW PITCH

MP-W

MP-R

PHONES

MAIN/

TS

TUNER MONITOR

NB

NR

SUB

RX

XFC

AF

RF/SQL

BAL

NR

TX

LOCK

ELEC-KEY

RIT

TX CLEAR

MIC

RIT/

TX

F-1

F-2

F-3

F-4

F-5

SPEECH

LOCK

SSB

CW/RTTY

AM/FM

FILTER

EXIT

MIC GAIN RF POWER

COMP KEY SPEED BK-IN DELAY

MICROPHONES (p. 81)

HM-36

SM-20

• Rear panel

ANTENNA 1, 2 (p. 14)	DC POWER SUPPLY
[Example]: ANT1 for 1.8–18 MHz bands
ANT2 for 21–50 MHz bands

13.8 V DC _ + 25 A

GROUND (p. 14)

Use the heaviest gauge wire or strap available and make the connection as short as possible.

STRAIGHT KEY

Grounding prevents electrical shocks, TVI and other problems.

15

3 INSTALLATION AND CONNECTIONS

■ Advanced connections

• Front panel

HEADPHONES

TIMER

HF/50MHz TRANSCEIVER

TWIN PBT

POWER

SPLIT

1.8

1

3.5

2

7

3

Y

DUAL

10

4

14

5

18

6

Z

TRANSMIT

WATCH

CHANGE

21

7

24

8

28

9

MW

PBT CLR

NOTCH

VFO/

GENE •

50

0

F-INPENT

M-CL

i756PRO

MEMO

NOTCH CW PITCH

MP-W

MP-R

PHONES

MAIN/

TS

TUNER MONITOR

NB

NR

SUB

RX

XFC

AF

RF/SQL

BAL

NR

TX

LOCK

ELEC-KEY

RIT

TX CLEAR

MIC

RIT/

TX

F-1

F-2

F-3

F-4

F-5

SPEECH

LOCK

SSB

CW/RTTY

AM/FM

FILTER

EXIT

MIC GAIN RF POWER

COMP KEY SPEED BK-IN DELAY

MIC

The AFSK modulation signal can be input from [MIC]. (p. 21)

• Rear panel

ANTENNA 1, 2 (pgs. 18–20) Connects a linear amplifier, antenna selector, etc.

TRANSVERTER

(p. 19)

Connects a transverter for V/UHF band use.

[REMOTE] (pgs. 12, 72)

Used for computer control and transceive operation.

RX ANTENNA

AH-4, AH-3 (p. 20)

	When using the AH-4 or AH-
AH-2b	3, it must be connected to
	the [ANT1] connector.

ACC SOCKETS (p. 13)									[SEND], [ALC]
									(p. 19)
EXTERNAL SPEAKER (p. 81)									Used for connecting a
									non-Icom linear ampli-
									fier.

SP-20

16

■ Power supply connections

Use an optional DC power supply with a 25 A capacity and above when operating the transceiver with AC power. Refer to the diagrams below.

INSTALLATION AND CONNECTIONS 3

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
AC outlet	A DC power supply		Transceiver
	13.8 V 25 A		to DC power
	Black	Red
			socket
	_	+
			Supplied
			DC power cable
AC cable
	30 A fuses

CONNECTING A VEHICLE BATTERY

							NEVER connect to		NOTE: Use terminals for
							a 24 V battery.		the cable connections.
							+ red		Crimp
							_ black

Grommet

Solder 12 V

battery Supplied DC power cable

17

3 INSTALLATION AND CONNECTIONS

	■ Linear amplifier connections		Use the [ANT1] connector when connecting a linear
			amplifier.
	CONNECTING THE IC-PW1
	To an	Remote control cable (supplied with the IC-PW1)
	antenna ACC-1	ACC cable (supplied with the IC-PW1)
			Be sure to connect the cable
	ANT	REMOTE	to the 7-pin ACC(2) jack.
			Coaxial cable
		INPUT1
			(supplied with the IC-PW1)

	INPUT2		Connect
		Coaxial cable	[INPUT2]
			if necessary.
		(optional)
EXCITER		ANT2	ANT1 ACC(2)	REMOTE
1	1&2	GND
	GND

IC-PW1

AC outlet			Ground
(Non-European versions : 100–120/220–240 V
European version	: 230 V)

IC-756PRO

Turn OFF the transceiver’s antenna tuner while tuning the IC-PW1’s tuner.

CONNECTING THE IC-4KL

Coaxial cable (supplied with the IC-4KL)	To an
	antenna
ACC cable (supplied with the IC-4KL)
	ACC

ANT1

ACC(2)

IC-4KL

Remote IC-4KL controller

Transceiver

Remote control cable

(supplied with the IC-4KL)

Ground

AC outlet (220–240 V)

Turn OFF the transceiver’s antenna tuner while tuning the IC-4KL’s tuner.

18

INSTALLATION AND CONNECTIONS 3

CONNECTING THE IC-2KL

CAUTION:

Set the transceiver output power for 80 W max. with the [RF POWER] control, otherwise, a protection circuit will activate.

ACC cable (supplied with the IC-2KL)

To an antenna

Coaxial cable (supplied with the IC-2KL)

ANT1

Transceiver

ANT

IC-2KL

GND

To the IC-2KLPS	ACC(1)	ACC(2)

Ground	OPC-118 (sold separately)

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	50	Ω	coaxial cable
antenna
	ANT1			Transceiver
RF OUTPUT RF INPUT
ALC
SEND
Non-Icom linear amplifier				ALC	SEND

The specifications for the SEND relay are 16 V DC 2 A. If this level is exceeded, a large external relay must be used.

■ 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.

Transverter jack

19

3 INSTALLATION AND CONNECTIONS

■ External antenna selector or antenna tuner connections

	CONNECTING THE EX-627
	Coaxial cable (supplied with the EX-627)
	ANT1
		EX-627
	ACC(2)	ACC cable
		(supplied with
		the EX-627)
		Ground

CONNECTING THE AH-4 or AH-3

•The AH-4 and AH-3 must be connected to [ANT1].

•The AH-3 can be used for the HF bands only, although the [ANT1] con-

nector is used for both HF and 50 MHz operation. Use a coaxial antenna	Long wire or optional AH-2b
switch when you operate the 50 MHz band with the AH-3 connected.

Coaxial cable (from the AH-4 or AH-3)

ANT1		Control cable
Transceiver		Ground	AH-4 or AH-3
CONNECTING THE IC-AT500 THROUGH THE IC-2KL
				ACC cable
				(supplied with the IC-2KL)
	To an				Coaxial cable
Coaxial cable	antenna				(supplied with the IC-2KL)
(supplied with			ACC cable
the IC-AT500)
			(supplied with the		ANT1	Transceiver
			IC-AT500)
		ANT	IC-2KL
		GND
	IC-AT500	To the IC-2KLPS			ACC(1)	ACC(2)
		Ground			OPC-118 (sold separately)

20

INSTALLATION AND CONNECTIONS 3

■ 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			Terminal unit (TU) or
operation
			Terminal Node Controller (TNC)
4	2	5	AF input
1	8	3	Ground (GND)
6		7
			PTT
			SQUELCH input*
			RTTY keying
[ACC(1)] socket

(Rear panel view)

AFSK and SSTV connections

Use SSB or FM mode for operation

	4	2	5
	1	8	3
	6		7

[ACC(1)] socket

(Rear panel view)

* Connect the SQUELCH line when required.

Terminal Node Controller (TNC) or Scan converter

AFSK output

Ground (GND)

AF input

Ground (GND)

PTT

SQUELCH input*

* Connect the SQUELCH line when required.

AFSK and SSTV connections via microphone connector

Terminal Node Controller (TNC)

Use SSB or FM mode for operation

	1	7
2	8	6
	3	5
	4

[MIC] connector

(Front panel view)

or Scan converter

AFSK output

AF input

Ground (GND)

PTT

SQUELCH input*

* Connect the SQUELCH line when required.

When connected to the [MIC] connector, [MIC

GAIN] and [AF] control adjustment is required.

21

4 FREQUENCY SETTING

■ 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.

wWhile pushing [M-CL] and [F-INP], push [POWER] for 2 sec. to turn power ON.

•The internal CPU is reset.

•A/D convertor calibration of the DSP unit starts and it takes 10 sec.

•The transceiver displays its initial VFO frequencies when resetting is complete.

eCorrect the set mode settings after resetting, if desired.

[POWER]

[F-INP] [M-CL]

Under cooler temperatures, the LCD may appear dark and unstable after turning power ON. This is normal and does not indicate any equipment malfunction.

■ Initial settings

After resetting the transceiver, set controls and switches as shown in the figure below.

[ANT]: 1

[METER]: Po

[POWER]: OFF

[TUNER], [MONITOR],

[NB], [NR]: OFF

[AF]: Max. CCW

[P.AMP]: 1

[ATT]: OFF

CW	: Max. clockwise
CCW	: Max. counterclockwise

[PBT CLR]: OFF

[NOTCH]: OFF

[RF/SQL]: 12 o’clock

[MIC GAIN]: 10–12 o’clock				[BAL]: Center					[AGC]: MID*1
	[RF POWER]: Max. CW				[COMP]*2: OFF WIDE;			[VOX],*2 [BK-IN],*2
					[1/4],*2 [TONE]*2: OFF			[RTTY FIL]*2: OFF

[LOCK]: OFF

*1 FAST in FM mode.

*2 Appears in some modes.

Turn power ON, then check the display. If any of the following indicators appear, turn them OFF as follows:

• Quick tuning step indicator “▼” : Push [TS].			• Dualwatch indicator “		” : Push [DUAL
			DUAL-W
• 1 Hz frequency readout		: Push [TS] for 2	• Twin peak filter indicator “		WATCH].
		sec. (while quick			:”Push [RTTY FIL].
		tuning step is OFF)	• Auto notch indicator “	TPF	: Push [NOTCH].
				”
• RIT indicator “	”	: Push [RIT].	A N		” : Push [NOTCH].
			• Manual notch indicator “
RIT	”	: Push [∂TX].		M N
• ∂TX indicator “
∂TX
• Split indicator SPLIT	”	: Push [SPLIT].

22

■ VFO description

VFO is an abbreviation of Variable Frequency Oscillator, and traditionally refers to an oscillator.

The transceiver’s VFO is somewhat different. The VFO of the IC-756PRO acts like a computer’s window and can show one frequency and one operating mode.

You can call up a desired frequency to the VFO with the keypad, memo pad-read switch (see p. 55) or the memory transfer function (see p. 53). You can also change the frequency with the tuning dial and select the operating mode with the mode switches.

During dualwatch or split frequency operation, the sub VFO is functional (non-outline, non-spotted, larger frequency characters). While pushing [XFC] during split frequency operation, you can change the transmit readout frequency with the keypad, memo pad-read switch or the memory transfer function.

FREQUENCY SETTING 4

								MODE
					Select			SWITCHES
ANT	BW 2.4k			SFT				qw:pp
1
	TX VFO				USB		FIL2
		qr≥qpp≥pp
METER
Po

121.076.50 CW

Change

Transfer

	Transfer		Transfer		TUNING DIAL
KEYPAD					MEMORY
(BAND KEY)		MEMO PAD			CHANNEL
21.295 MHz		28.025 MHz			7.001 MHz

• 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	BW 2.4k			SFT	0			qw:pp
1
	TX VFO				USB		FIL2

METER	qr≥qpp≥pp
Po

121.076.50 CW

The frequency is changed.

ANT	BW 2.4k			SFT	0			qw:pp
1
	TX VFO				USB		FIL2

METER	qr≥qwe≥pp
Po

121.076.50 CW

Memory mode is selected.

	ANT	BW	500 SFT	0	BPF qw:pp
	1
		TX	1	CW	FIL2

	METER		wq≥puy≥tp
	Po		VFO		14.123.00				USB
VFO is selected again.
	ANT	BW 2.4k			SFT 0				qw:pp
	1
		TX VFO				USB FIL2
			qr≥qwe≥pp
	METER
	Po

121.076.50 CW

Changed frequency (14.123 MHz) appears.

MEMORY MODE (pgs. 50–54)

Each memory channel shows a frequency and operating mode like a VFO. Even if the frequency or mode is changed, the memory channel does not memorize the new frequency or operating mode.

When the memory channel is selected from another memory channel or VFO mode, the memorized frequency and operating mode appear.

[EXAMPLE]

Memory channel 1 is selected.

ANT	BW	2.4k SFT		0			qw:pp
1
	TX	1		USB		FIL2

		METER		qr≥qpp≥pp
		Po		VFO		14.100.00				USB
The frequency is changed.
		ANT	BW	2.4k		SFT 0				qw:pp
		1
			TX	1			USB FIL2
				qr≥qwe≥pp
		METER
		Po		VFO 14.100.00 USB
Another memory channel is selected.
		ANT	BW	2.4k		SFT 0				qw:pp
		1
			TX	12			USB FIL2
				wq≥wrt≥pp
		METER
		Po		VFO 14.100.00 USB
Memory channel 1 is selected again.
		ANT	BW	2.4k		SFT 0				qw:pp
		1
			TX	1			USB FIL2
				qr≥qpp≥pp
		METER
		Po		VFO		14.100.00				USB

Changed frequency (14.123 MHz) does not appear and memorized frequency (14.100 MHz) appears instead.

23

4 FREQUENCY SETTING

■ Frequency setting with the tuning dial

• For ham band use

qPush 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.)

ANT	BW 2.4k			SFT	0			qw:pp
1
	TX VFO				USB		FIL2

METER	wq≥wpp≥pp
Po	1 21.076.50 CW

• For general coverage receiver use

qPush [GENE] on the keypad 1–3 times.

•The [GENE] key calls up a frequency for general coverage receiver use.

ANT	BW 2.4k			SFT	0			qw:pp
1
	TX VFO				USB		FIL2

METER	qt≥qpp≥pp
Po	1 21.076.50 CW

wRotate the tuning dial to set the desired frequency.

• For quick tuning, use the quick tuning step function. (p.

w Rotate the tuning dial to set the desired frequency.

ANT	BW 2.4k			SFT	0			qw:pp
1
	TX VFO				USB		FIL2

METER	wq≥wot≥pp
Po	1 21.076.50 CW

25)

ANT	BW 2.4k			SFT	0			qw:pp
1
	TX VFO				USB		FIL2

METER	o≥uip≥pp
Po	1 21.076.50 CW

eSelect the desired operating mode with the mode switch. (p. 26)

eSelect the desired operating mode with the mode switch. (p. 26)

If the dial lock function is activated, the lock indicator lights, and the tuning dial does not function. In this case, push [LOCK] to deactivate the lock function.

TRIPLE BAND STACKING REGISTER

The triple band stacking register provides 3 memories in one band. 3 sets of a frequency and mode on each band are automatically stored when used.

If a band key is pushed once, the frequency and mode last used are called up. When the key is pushed again, another stored frequency and mode are called up.

This function is convenient when you operate 3 modes on one band. For example, one register is used for a CW frequency, another for an SSB frequency and the other one for an RTTY frequency.

[EXAMPLE]
14 MHz band
Push		21	m
	14 b
CW 14.025.00		14	b
USB 14.195.00
RTTY14.090.00

21 MHz band
Push	21	m
CW 21.025.00
USB 21.295.00
RTTY21.090.00

■ Direct frequency entry with the keypad

The transceiver has a keypad for direct frequency entry as described below.

qPush [F-INP].

• “F-inp appears”.

wInput the desired frequency.

•Input “ • ”(decimal point) between the MHz units and kHz units.

ePush [(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 1 4 • 0 2 5 ENT

18.0725 MHz

F-INP 1	8	•	0	7	2	5	ENT
706 kHz		F-INP	•	7	0	6	ENT
5.100 MHz		F-INP	5	•	1	ENT
7.000 MHz		F-INP	7	ENT

21.280

21.245 F-INP

•

2

4

5

ENT

24