Icom IC-756PROIII Instruction Manual
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Icom IC-756PROIII Instruction Manual

Hf/50 mhz all mode transceiver
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INSTRUCTION MANUAL
HF/50 MHz
ALL MODE TRANSCEIVER
This device complies with Part 15 of the FCC rules. Operation is sub-
ject to the following two conditions: (1) This device may not cause
harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.

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Summary of Contents for Icom IC-756PROIII

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

  • Page 2: Foreword

    We would like to take a couple of moments of your time to thank you for mak- ing your IC-756PROIII your radio of choice, and hope you agree with Icom’s philosophy of “technology first.”...

  • Page 3: Precautions

    Other manufacturer’s microphones have different pin assignments, and connection to the IC-756PROIII may damage the transceiver. For U.S.A. only CAUTION: Changes or modifications to this device, not expressly approved by Icom Inc., could void your authority to operate this device under FCC regulations.

  • Page 4: Table Of Contents

    TABLE OF CONTENTS IMPORTANT ... i FOREWORD ... i EXPLICIT DEFINITIONS ... i SUPPLIED ACCESSORIES ... i PRECAUTIONS ... ii TABLE OF CONTENTS ... iii 1 PANEL DESCRIPTION ... 1 – 12 ■ Front panel ... 1 ■ LCD display ... 9 ■...

  • Page 5: Table Of Contents

    6 FUNCTION FOR TRANSMIT ... 66 – 72 ■ VOX function ... 66 D Using the VOX function ... 66 D Adjusting the VOX function... 66 ■ Break-in function ... 67 D Semi break-in operation ... 67 D Full break-in operation ... 67 ■...

  • Page 6: Panel Description

    Set the [MIC] control so that the ALC meter sometimes swings during normal voice level transmission in SSB mode. Decreases CW/RTTY AM/FM FILTER EXIT/SET (dot) (com) (dash) RF/SQL Decreases Increases No audio output Max. audio output Increases Recommended level for an Icom microphone MIC GAIN MIC GAIN...
  • Page 7 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 re- ceived. • The squelch is particularly effective for FM. It is also available for other modes.
  • Page 8 PANEL DESCRIPTION ■ Front panel (continued) TIMER HF/50MHz TRANSCEIVER POWER TRANSMIT PHONES TUNER MONITOR RF/SQL ELEC-KEY MIC GAIN RF POWER !3 COMPRESSION LEVEL CONTROL [COMP] (p. 68) Adjusts the speech compression level in SSB. Compression level decreases COMP !4 SEMI BREAK-IN DELAY CONTROL [BK-IN DELAY] Adjusts the transmit-to-receive switching delay time for CW semi break-in operation.
  • Page 9 ➥ Activates or selects fast, middle or slow AGC time constant when pushed. (p. 59) • “FAST” is only available for FM mode. ➥ Enters the AGC set mode when pushed for 1 sec. (p. 59) AGC time constant can be set between 0.1 to 8.0 sec.
  • Page 10 PANEL DESCRIPTION ■ Front panel (continued) EIVER COMP BK-IN DELAY KEY SPEED @1 LCD FUNCTION SWITCHES [F-1]–[F-5] Push to select the function indicated in the LCD dis- play above these switches. • Functions vary depending on the operating condition. @2 MODE SWITCHES Selects the desired mode.
  • Page 11 @9 ∂ ∂ TX SWITCH [∂ ∂ TX] (p. 69) ➥ Turns the ∂TX function ON and OFF when pushed. • Use the [RIT/∂ ∂ TX] control to vary the ∂TX frequency. ➥ Adds the ∂TX shift frequency to the operating frequency when pushed for 1 sec.
  • Page 12 PANEL DESCRIPTION ■ Front panel (continued) CEIVER COMP BK-IN DELAY KEY SPEED #7 RECEIVE INDICATOR [RX] Lights green while receiving a signal and when the squelch is open. #8 TRANSMIT INDICATOR [TX] Lights red while transmitting. #9 LOCK INDICATOR [LOCK] (p. 65) Lights red when the dial lock function is activated.
  • Page 13 ➥ 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 fre- quencies in each band. ➥ After pushing [(F-INP)ENT], enters a keyed fre- quency or memory channel.

  • Page 14: Lcd Display

    PANEL DESCRIPTION ■ LCD display q TX INDICATOR Indicates the frequency readout for transmission. w VFO/MEMORY CHANNEL INDICATOR (pgs. 23, 77) Indicates the VFO mode or selected memory chan- nel number. e SELECT MEMORY CHANNEL INDICATOR (p. 86) Indicates the displayed memory channel is set as a select memory channel.

  • Page 15: Screen Menu Arrangement

    ■ Screen menu arrangement The following screens can be selected from the start up screen. Choose the desired screen using the fol- lowing chart. • Start up screen 2.4k FIL2 qr.qpp.pp METER --. ---. -- P.AMP FIL2 qr.qpp.pp --. ---. -- BK-IN SCOPE VOICE...

  • Page 16: Rear Panel

    Accepts an 4–8 Ω speaker. or AH-3 o ALC INPUT JACK [ALC] (p. 17) Connects to the ALC output jack of a non-Icom lin- ear amplifier. !0 SEND CONTROL JACK [SEND] (p. 17) Goes to ground while transmitting to control exter- nal equipment such as a linear amplifier.

  • Page 17: Microphone (Hm-36)

    !2 ANTENNA CONNECTOR 1 [ANT1] !3 ANTENNA CONNECTOR 2 [ANT2] (pgs. 13, 14) Accept a 50 Ω antenna with a PL-259 connector. When using an optional AH-4 or AH-3 MATIC ANTENNA TUNER HF AUTOMATIC AN- , connect it to the [ANT1] connector. TENNA TUNER The internal antenna tuner activates for [ANT2] and deactivates for [ANT1] when connecting the AH-4...

  • Page 18: Installation And Connections

    [GND] the transceiver and antenna. Low SWR allows full power for transmitting even when using the antenna tuner. The IC-756PROIII has an SWR meter to mon- itor the antenna SWR continuously. Protect your transceiver from lightning 30 mm Slide the coupling ring down.

  • Page 19: Required Connections

    ■ 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. 43) • Rear panel ANTENNA 1, 2 (p. 13) [Example]: ANT1 for 1.8–18 MHz bands ANT2 for 21–50 MHz bands GROUND (p.

  • Page 20: Advanced Connections

    SPLIT DUAL WATCH CHANGE PBT CLR NOTCH F-INP M-CL GENE VFO/ MEMO NOTCH CW PITCH M.SCOPE MP-W MP-R MAIN/ LOCK CLEAR RIT/ REC/PLAY LOCK/SPEECH AM/FM FILTER EXIT/SET [SEND], [ALC] (p. 17) Used for connecting a non-Icom linear ampli- fier. SP-23...

  • Page 21: Power Supply Connections

    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. : positive + terminal Black...

  • Page 22: Linear Amplifier Connections

    ACC-1 REMOTE IC-PW1/EURO AC outlet (Non-European versions: 100–120/220–240 V European version Turn OFF the transceiver’s antenna tuner while tuning the IC-PW1/EURO’s tuner. CONNECTING A NON-ICOM LINEAR AMPLIFIER To an antenna RF OUTPUT RF INPUT SEND Non-Icom linear amplifier Use the [ANT1] connector when connecting a linear amplifier.

  • Page 23: External Antenna Tuner Connections

    DO NOT short pin 2 to ground as this can damage the internal 8 V regulator. NOTE: DC voltage is applied to pin 1 for micro- phone operation. Take care when using a non-Icom microphone. Long wire or optional AH-2b DESCRIPTION Max.

  • Page 24: Fsk And Afsk (Sstv) Connections

    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.

  • Page 25: Accessory Connector Information

    ■ Accessory connector information ACC (1) PIN No. NAME RTTY Controls RTTY keying GND Connects to ground. Input/output pin. SEND Goes to ground when transmitting. When grounded, transmits. Modulator input. Connects to a modulator. AF detector output. Fixed, regardless of [AF] position in default settings.

  • Page 26: Basic Operation

    BASIC OPERATION ■ When first applying power Before first applying power, make sure all connections required for your system are complete by referring to Section 2. Then, reset the transceiver using the follow- ing procedure. Resetting CLEARS all programmed contents in memory channels and returns programmed values in set mode to default values.

  • Page 27: Vfo Description

    The transceiver’s VFO is somewhat different. The VFO of the IC-756PROIII 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.

  • Page 28: Selecting Vfo/Memory Mode

    BASIC OPERATION ■ Selecting VFO/memory mode “VFO” indicator FIL2 FIL2 qr.qot.pp METER METER 14.100.00 14.100.00 Memory channel number 2.4k 2.4k U S B U S B FIL2 FIL2 qr.qpp.pp METER METER V F O 14.195.00 14.195.00 ■ Main/Sub band selection [VFO/MEMO] ➥...

  • Page 29: Selecting An Operating Band

    ■ Selecting an operating band BAND REGISTER 1 1.8 MHz 1.900000 MHz CW 3.5 MHz 3.550000 MHz LSB 7 MHz 7.050000 MHz LSB 10 MHz 10.120000 MHz CW 14 MHz 14.100000 MHz USB 18 MHz 18.100000 MHz USB 21 MHz 21.200000 MHz USB 24 MHz 24.950000 MHz USB...

  • Page 30: Frequency Setting

    BASIC OPERATION ■ Frequency setting The transceiver has several tuning methods for conve- nient frequency tuning. D D Tuning with the tuning dial D D Direct frequency entry with the keypad The transceiver has a keypad for direct frequency entry as described right. q Push the desired band key on the keypad 1–3 Band keys times.

  • Page 31: D Quick Tuning Step

    D D 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. D D Selecting “kHz” step Mode selection q Push [TS] momentarily to turn the quick tuning function ON.

  • Page 32: D Selecting 1 Hz Step

    BASIC OPERATION D D Selecting 1 Hz step The minimum tuning step of 1 Hz can be used for fine tuning. ⁄ tuning function (SSB data/CW/RTTY only) While operating in SSB data/CW/RTTY, the function is available for critical tuning. Dial rotation is reduced to ⁄...

  • Page 33: D Auto Tuning Step Function

    D D Auto tuning step function When rotating the tuning dial rapidly, the tuning speed accelerated automatically as selected. [(F-1)Y] [EXIT/SET] [(F-2)Z] [(F-5)OTHERS] D D Band edge warning beep When selecting a frequency, that lies outside of a band’s specified frequency range, a warning beep sounds.

  • Page 34: Operating Mode Selection

    SSB (LSB/USB), SSB data (LSB-D/USB-D), CW, CW reverse (CW-R), RTTY, RTTY reverse (RTTY-R), AM, AM data (AM-D), FM and FM data (FM-D) are avail- able in the IC-756PROIII. Select the desired operation mode as follows. To select a mode of operation, push the desired mode switch momentarily.

  • Page 35: Squelch And Receive (Rf) Sensitivity

    ■ Squelch and receive (RF) sensitivity Adjusts the RF gain and squelch threshold level. The squelch removes noise output from the speaker (closed position) when no signal is received. • The squelch is particularly effective for FM. It is also avail- able for other modes.

  • Page 36: Meter Function

    BASIC OPERATION ■ Meter function The transceiver has 4 transmit meter functions for your convenience. Select the desired meter with the [METER] switch. • Analog transmit meter ➥ Push [METER] to select RF power or compression level (COMP) [METER] DISPLAY MEASUREMENT INDICATION Indicates the relative RF output power in %.

  • Page 37: Basic Transmit Operation

    ■ Basic transmit operation Before transmitting, monitor your selected oper- ating frequency to make sure transmitting won’t cause interference to other stations on the same frequency. It’s good Amateur practice to listen first, and then, even if nothing is heard, ask “is the frequency in use”...

  • Page 38: Receive And Transmit

    RECEIVE AND TRANSMIT ■ Operating SSB [TRANSMIT] [TX] indicator [RX] indicator Band keys [AF] [MIC GAIN] [SSB] D Convenient functions for receive • Preamp (p. 57) ➥ Push [P.AMP] several times to set the preamp OFF, preamp 1 ON or preamp 2 ON. •...

  • Page 39: D Convenient Functions For Transmit

    filter settings into the memory channel for easy recall. *The channel center frequencies that are specified by the FCC, show the center frequency of their passband. However, the IC-756PROIII displays carrier point frequency, so set 1.5 kHz below from FCC channel center frequency.

  • Page 40: Operating Cw

    RECEIVE AND TRANSMIT ■ Operating CW [TRANSMIT] [TX] indicator [RX] indicator Band keys [AF] [KEY SPEED] [CW/RTTY] D D Convenient functions for receive • Preamp (p. 57) ➥ Push [P.AMP] several times to set the preamp OFF, preamp 1 ON or preamp 2 ON. •...

  • Page 41: D Convenient Functions For Transmit

    D D Convenient functions for transmit • Break-in function (p. 67) ➥ Push [BK-IN] several times to select the break-in OFF, semi break-in and full break-in. • “BK-IN SEMI” or “BK-IN FULL” appears when the semi break-in or full break-in function is set to ON, re- spectively.

  • Page 42: D About Cw Pitch Control

    RECEIVE AND TRANSMIT D D About CW pitch control Lower frequency FILTER FILTER BK-IN BK-IN 4 5 0 4 5 0 7 0 0 7 0 0 9 5 0 9 5 0 PBT1 PBT1 PBT2 PBT2 The received CW audio pitch and monitored CW audio can be adjusted to suit your preference (300 to 900 Hz in 25 Hz steps) without changing the operat- ing frequency.

  • Page 43: Electronic Cw Keyer

    EDIT EDIT CW KEY CW KEY The IC-756PROIII has a number of convenient func- tions for the electronic keyer that can be accessed from the memory keyer menu. q Push [EXIT/SET] several times, if necessary. w Push [CW/RTTY] to select CW mode.

  • Page 44: D Memory Keyer Send Screen

    RECEIVE AND TRANSMIT D D Memory keyer send screen Pre-set characters can be sent using the keyer send menu. Contents of the memory keyer are set using the edit menu. [TRANSMIT] [(F-1)M1]–[(F-4)M4] [CW/RTTY] [EXIT/SET] M E M O R Y K E Y E R M E M O RY K EY ER C Q  ...

  • Page 45: D Editing A Memory Keyer

    Q R Z ? keys ç å • Pre-programmed contents Contents CQ TEST CQ TEST DE ICOM ICOM TEST UR 5NN✽ BK CFM TU QRZ? • Programming contents q Push [EXIT/SET] several times, if necessary. w Push [CW/RTTY] to select CW mode.

  • Page 46: D Contest Number Set Mode

    RECEIVE AND TRANSMIT D D Contest number set mode This menu is used to set the contest (serial) number and count up trigger, etc. [(F-3)DEF] [(F-1)∫] [(F-2)√] [EXIT/SET] KEYER 001 KEYER 001 N u m b e r N um b er S t y l e S ty le C ou n t  U P C o u n...

  • Page 47: D Keyer Set Mode

    D D Keyer set mode This set mode is used to set the CW side tone, mem- ory keyer repeat time, dash weight, paddle specifica- tions, keyer type, etc. [(F-3)DEF] [(F-1)∫] [(F-2)√] [EXIT/SET] K EY ER C W- KE Y K E Y E R C W - K E Y K ey e r R e p e a t K e y e r...
  • Page 48 RECEIVE AND TRANSMIT D D Keyer set mode (continued) R R i i s s e e T T i i m m e e (Rise time) This item sets the envelop time period which the out- put power becomes the set transmit power. •...

  • Page 49: Operating Rtty (Fsk)

    RTTY and RTTY-R modes. • “RTTY” or “RTTY-R” appears. e Push [(F-3)DECODE] to display the decoder screen. • The IC-756PROIII has a Baudot decoder. r Rotate the tuning dial to simultaneously tune a de- Tuning dial sired signal.

  • Page 50: D About Rtty Reverse Mode

    RECEIVE AND TRANSMIT D D About RTTY reverse mode Received characters are occasionally garbled when the receive signal is reversed between MARK and SPACE. This reversal can be caused by incorrect TNC connections, settings, commands, etc. To receive a reversed RTTY signal correctly, select RTTY-R (RTTY Reverse) mode.

  • Page 51: D Functions For The Rtty Decoder Indication

    D D Functions for the RTTY decoder indication The transceiver has an RTTY decoder for Baudot (mark freq.: 2125 Hz, shift freq.: 170 Hz, 45 bps). An external terminal unit (TU) or terminal node con- troller (TNC) is not necessary for receiving a Baudot signal.

  • Page 52: D Rtty Memory Transmission

    RECEIVE AND TRANSMIT D D RTTY memory transmission Pre-set characters can be sent using the RTTY mem- ory. Contents of the memory are set using the edit menu. [(F-1)RT1]–[(F-4)RT4] [EXIT/SET] [(F-5)1-4/5-8] [(F-1)RT5]–[(F-4)RT8] RTTY R T TY FIL2 FIL2 qr.qpp.pp METER METER 21.

  • Page 53: D Editing Rtty Memory

    ↵DE ICOM ICOM K↵ ↵DE ICOM ICOM ICOM K↵ ↵QSL UR 599–599 BK↵ ↵QSL DE ICOM ICOM UR 599–599 BK↵ ↵73 GL SK↵ ↵CQ CQ CQ DE ICOM ICOM ICOM K↵ (blank) (blank) • Programming contents q Push [EXIT/SET] several times, if necessary.

  • Page 54: D Rtty Decoder Set Mode

    RECEIVE AND TRANSMIT D D RTTY decoder set mode This set mode is used to set the decode USOS func- tion, etc. [(F-3)DEF] [(F-1)∫] [(F-2)√] [EXIT/SET] R T T Y D E C O D E S E T R T T Y D EC OD E S ET R TT Y D e c o d e R T T Y De co d e U S O S...

  • Page 55: Operating Am

    ■ Operating AM [TRANSMIT] [TX] indicator [RX] indicator Band keys [AF] [MIC GAIN] [AM/FM] D D Convenient functions for receive • Preamp (p. 57) ➥ Push [P.AMP] several times to set the preamp OFF, preamp 1 ON or preamp 2 ON. •...

  • Page 56: Operating Fm

    RECEIVE AND TRANSMIT ■ Operating FM [TRANSMIT] [TX] indicator [RX] indicator Band keys [AF] [MIC GAIN] [AM/FM] D D Convenient functions for receive • Preamp (p. 57) ➥ Push [P.AMP] several times to set the preamp OFF, preamp 1 ON or preamp 2 ON. •...

  • Page 57: Repeater Operation

    ■ Repeater operation A repeater amplifies received signals and retransmits them at a different frequency. When using a repeater, the transmit frequency is shifted from the receive fre- quency by an offset frequency. A repeater can be ac- cessed using split frequency operation with the shift frequency set to the repeater’s offset frequency.

  • Page 58: Tone Squelch Operation

    RECEIVE AND TRANSMIT ■ Tone squelch operation The tone squelch opens only when receiving a signal containing a matching subaudible tone. You can silently wait for calls from group members using the same tone. [VFO/MEMO] [SPLIT] [AM/FM] Available tone squelch tones 67.0 085.4 107.2...

  • Page 59: Data Mode (Sstv/Psk31) Operation

    ■ Data mode (SSTV/PSK31) operation [TRANSMIT] [TX] indicator [RX] indicator Band keys [AF] [MIC GAIN] [AM/FM] ✔ For your information Carrier point frequency is displayed when SSB data mode is selected. See the diagram below for the tone-pair example. 2325 Hz 200 Hz 2125 Hz Carrier point...

  • Page 60: Function For Receive

    FUNCTION FOR RECEIVE ■ Spectrum scope screen This function allows you to display the relative strengths of signals around the center frequency. The span can be set to ±12.5 kHz, ±25 kHz, ±50 kHz and ±100 kHz. Ideal for monitoring band conditions in an instant.

  • Page 61: D Scope Set Mode

    D Scope set mode The spectrum scope shows the transmit signal wave- form while transmitting. This can be deactivated if de- sired. [(F-1)Y] [(F-2)Z] [EXIT/SET] [(F-3)DEF] S C O P E SC O P E  S E T SE T S c o p e Sc op e ...

  • Page 62: Preamplifier

    FUNCTION FOR RECEIVE ■ Preamplifier The preamp amplifies received signals in the front end circuit to improve the S/N ratio and increase the sensitivity. Set this to preamp 1 or preamp 2 when re- ceiving weak signals. [P.AMP] ■ Attenuator The attenuator prevents a desired signal from distor- tion when very strong signals are near the desired fre- quency or when very strong electric fields, such as...

  • Page 63: Rit Function

    ■ RIT function The RIT (Receive Increment Tuning) function com- pensates for off-frequencies of the communicating station. The function shifts the receive frequency up to ±9.999 kHz in 1 Hz steps (10 Hz steps when cancelling the 1 Hz step readout) without moving the transmit fre- quency.

  • Page 64: Agc Function

    FUNCTION FOR RECEIVE ■ AGC function The AGC (auto gain control) controls receiver gain to produce a constant audio output level even when the received signal strength is varied by fading, etc. The transceiver has 3 AGC characteristics (time con- stant;...

  • Page 65: Twin Pbt Operation

    ■ Twin PBT operation General PBT (Passband Tuning) function electronically narrows the IF passband width by shifting the IF fre- quency to slightly outside of the IF filter passband to reject interference. This transceiver uses the DSP cir- cuit for the PBT function. Moving both [TWIN PBT] controls to the same position shifts the IF.

  • Page 66: If Filter Selection

    FUNCTION FOR RECEIVE ■ IF filter selection The transceiver has 3 passband width IF filters for each mode. For SSB and CW modes, the passband width can be set within 50 to 3600 Hz in 50 or 100 Hz steps. A total of 41 passband widths are available.

  • Page 67: Dsp Filter Shape

    ■ DSP filter shape The type of DSP filter shape for each SSB and CW can be selected independently from soft and sharp. [(F-2)SSB-FIL] [(F-3)DSP] [EXIT/SET] DSP FILTER SET SHARP SHARP SHARP SHARP BK-IN BK-IN SSB-FIL SSB-FIL CW-FIL CW-FIL Push Push SOFT SOFT...

  • Page 68: Dualwatch Operation

    FUNCTION FOR RECEIVE ■ Dualwatch operation Dualwatch monitors 2 frequencies with the same mode simultaneously. During dualwatch, both frequencies should be on the same band, because the bandpass filter in the RF cir- cuit is selected for the main readout frequency. [BAL] [DUALWATCH] RIT function can be used for the main readout only.

  • Page 69: Noise Blanker

    ■ Noise blanker The noise blanker eliminates pulse-type noise such as from car ignitions. The noise blanker is not avail- able for FM mode. [NB] [(F-3)DEF] NB L eve l NB L eve l COMP COMP WIDE WIDE ■ Notch function This transceiver has auto and manual notch func- tions.

  • Page 70: Noise Reduction

    FUNCTION FOR RECEIVE ■ Noise reduction The noise reduction function reduces noise compo- nents and picks out desired signals which are buried in noise. The received signals are converted to digital signals and then the desired signals are separated from the noise. q Push the [NR] switch to turn the noise reduction •...

  • Page 71: Function For Transmit

    ■ VOX function The VOX (Voice-Operated Transmission) function switches between transmit and receive with your voice. This function provides an opportunity to input log en- tries into your computer, etc., while operating. D Using the VOX function [VOX] D Adjusting the VOX function [VOX] 2.4k 2.4k...

  • Page 72: Break-In Function

    ■ Break-in function The break-in function is used in CW mode to automat- ically toggle the transceiver between transmit and re- ceive when keying. The IC-756PROIII is capable for full break-in or semi break-in. D Semi break-in operation During semi break-in operation, the transceiver se-...

  • Page 73: Transmit Filter Width Setting (Ssb Only)

    ■ Transmit filter width setting (SSB only) The transmit filter width for SSB mode can be se- lected from wide, middle and narrow. [COMP] ■ Speech compressor The speech compressor increases average RF out- put power, improving signal strength and readability in SSB mode.

  • Page 74: Tx Function

    FUNCTION FOR TRANSMIT ■ ∂ ∂ TX function The ∂TX function shifts the transmit frequency up to ±9.999 kHz in 1 Hz steps (10 Hz steps when can- celling the 1 Hz step readout) without moving the re- ceive frequency. •...

  • Page 75: Monitor Function

    ■ Monitor function The monitor function allows you to monitor your trans- mit IF signals in any mode through the speaker. Use this to check voice characteristics while adjusting SSB transmit tones. (p. 95) The CW side tone func- tions regardless of the [MONITOR] switch setting. q Push [MONITOR].

  • Page 76: Split Frequency Operation

    FUNCTION FOR TRANSMIT ■ Split frequency operation Split frequency operation allows you to transmit and receive in the same mode on two different frequencies. The split frequency operation is basically performed using 2 frequencies on the main and sub readouts. The following is an example of setting 21.290 MHz for receiving and 21.310 MHz for transmitting.

  • Page 77: Quick Split Function

    ■ Quick split function When you find a DX station, an important considera- tion is how to set the split frequency. When you push the [SPLIT] switch for 1 sec., split fre- quency operation is turned ON, the sub readout is equalized to the main readout frequency and enters standby for transmit frequency input.

  • Page 78: Voice Recorder Functions

    VOICE RECORDER FUNCTIONS ■ Digital voice recorder The transceiver has a total of 8 memory channels, 4 each for transmit and receive, of digital voice memo- ries. A maximum message length of 15 sec. can be recorded in each receive channel, and a total message length of 90 sec.
  • Page 79 ■ Digital voice recorder • One-touch voice recording To record the receiving signal contents immediately, one-touch voice recording is available. q Push [REC/PLAY] for 1 sec. while receiving a sig- nal to start recording. • “REC” flashes. • Records audio into the channel R4. w Push [REC/PLAY] momentarily to stop recording.

  • Page 80: Recording A Message For Transmit

    VOICE RECORDER FUNCTIONS ■ Digital voice recorder • Recording a message for transmit To transmit a message using a voice recorder, record the desired message in advance as described below. q Push [EXIT/SET] several times to close a multi- function screen, if necessary. w Push [(F-2)VOICE] to call up the voice recorder screen.
  • Page 81 ■ Digital voice recorder • Sending a message for transmit q Push [EXIT/SET] several times to close a multi- function screen, if necessary. w Select a phone mode by pushing [SSB] or [AM/FM]. e Push [(F-2)VOICE] to call up the voice recorder screen.

  • Page 82: Memory Operation

    MEMORY OPERATION ■ Memory channels The transceiver has 101 memory channels. The mem- ory mode is very useful for quickly changing to often- used frequencies. MEMORY MEMORY CHANNEL CHANNEL NUMBER Regular memory 1–99 channels Scan edge P1, P2 memory channels ■...

  • Page 83: Memory Channel Screen

    ■ Memory channel screen The memory channel screen simultaneously shows 7 memory channels and their programmed contents. 13 memory channels can be displayed in the wide mem- ory channel screen. You can select a desired memory channel from the memory channel screen. •...

  • Page 84: Memory Channel Programming

    MEMORY OPERATION ■ Memory channel programming Memory channel programming can be preformed ei- ther in VFO mode or in memory mode. • Programming in VFO mode q Set the desired frequency and operating mode in VFO mode. w Push [Y Y ]/[Z Z ] several times to select the desired memory channel.

  • Page 85: Frequency Transferring

    ■ Frequency transferring The frequency and operating mode in a memory chan- nel can be transferred to the VFO. • Transferring in VFO mode This is useful for transferring programmed contents to VFO. q Select VFO mode with [VFO/MEMO]. w Select the memory channel to be transferred with [Y Y ]/[Z Z ].

  • Page 86: Memory Names

    MEMORY OPERATION ■ Memory names All memory channels (including scan edges) can be tagged with alphanumeric names of up to 10 charac- ters each. Capital letters, small letters, numerals, some symbols (! # $ % & ¥ ? " ’ ` ^ + – ✱ / . , : ; = < > ( ) [ ] { } | _ and spaces can be used.

  • Page 87: Memo Pads

    ■ Memo pads The transceiver has a memo pad function to store fre- quency and operating mode for easy write and recall. The memo pads are separate from memory channels. The default number of memo pads is 5, however, this can be increased to 10 in set mode if desired.

  • Page 88: Scans

    SCANS ■ Scan types PROGRAMMED SCAN Repeatedly scans between two scan edge frequencies (scan edge memory channels P1 and P2). Scan edge P1 or P2 Scan Jump This scan operates in VFO mode. MEMORY SCAN Repeatedly scans all programmed memory channels. ß...

  • Page 89: Programmed Scan Operation

    ■ Programmed scan operation q Push [EXIT/SET] several times to close a multi- function screen, if necessary. w Select VFO mode. e Select the desired operating mode. • The operating mode can also be changed while scan- ning. r Push [(F-5)SCAN] to select the scan screen. SCAN SCAN ∂...

  • Page 90: Fine Programmed Scan

    SCANS ■ Fine programmed scan/fine ∂F scan Fine scan functions as programmed or ∂F scan, but scan speed decreases when the squelch opens but does not stop. The scanning tuning step shifts from 50 Hz to 10 Hz while the squelch opens. q Push [EXIT/SET] several times to close a multi- function screen, if necessary.

  • Page 91: Select Memory Scan Operation

    ■ Select memory scan operation q Push [EXIT/SET] several times to close a multi- function screen, if necessary. w Select memory mode. e Push [(F-5)SCAN] to select the scan screen. 2.4k 2.4k U S B U S B FIL2 FIL2 qr.qot.pp METER METER...

  • Page 92: Scan Set Mode

    SCANS ■ Scan set mode Scan set mode is used for programming scanning speed and scan resume condition. • Scan speed The transceiver has 2 speeds for scanning, high and low. q Push [EXIT/SET] several times to close a multi- function screen, if necessary.

  • Page 93: Antenna Tuner Operation

    ■ Automatic antenna selection The transceiver covers 0.1–60 MHz over 10 bands. Each band key has a band memory which can memo- rize a selected antenna (ANT1, ANT2, ANT1/RX an- tenna and ANT2/RX antenna). When you change the operating frequency beyond a band, the previously used antenna is automatically selected for the new band.

  • Page 94: Antenna Tuner Operation

    ANTENNA TUNER OPERATION ■ Antenna tuner operation The internal automatic antenna tuner matches the transceiver to the connected antenna automatically. Once the tuner matches an antenna, the variable ca- pacitor angles are memorized as a preset point for each frequency range (100 kHz steps). Therefore, when you change the frequency range, the variable capacitors are automatically preset to the memorized point.

  • Page 95: Optional External Tuner Operation

    ■ Optional external tuner operation • AH-4/AH-3 HF AUTOMATIC ANTENNA TUNER The AH-4 matches the IC-756PROIII to a long wire antenna more than 7 m/23 ft long (3.5 MHz and above) The AH-3 matches the IC-756PROIII to a long wire antenna more than 3 m/10 ft long (3.5 MHz and above)

  • Page 96: Clock And Timers

    CLOCK AND TIMERS ■ Time set mode The transceiver has a built-in 24-hour clock with power-off and power-on timer functions. This is useful when logging QSO’s and so on. The clock indication is always displayed except after pushing [(F-INP)ENT]. [(F-1)Y] [(F-2)Z] [(F-4)SET] T T i i m m e e ( ( N N o o w w ) )

  • Page 97: D Setting The Current Time

    D Setting the current time q Entering time set mode, push [(F-1)Y Y ] to select the Time (Now) item. 2.4k 2.4k U S B U S B FIL2 FIL2 qr.qot.pp METER METER 14.100.00 14.100.00 P.AMP P.AMP FIL2 FIL2 qr.wpt.pp 14.100.00 14.100.00 TIME SET...

  • Page 98: D Setting Power-On Time

    CLOCK AND TIMERS D Setting power-on time The transceiver can be set to turn ON automatically at a specified time. q Entering time set mode, push [(F-1)Y Y ] or [(F-2)Z Z ] to select the Power-ON Time Set item. TIME SET TIME SET T im e ( N o w )

  • Page 99: Set Mode

    ■ Set mode description Set mode is used for programming infrequently changed values or conditions of functions. This trans- ceiver has a level set mode, display set mode, timer set mode and miscellaneous (others) set mode. • Set mode operation [(F-2)] [(F-4)] [(F-5)] [(F-1)] [(F-3)]...

  • Page 100: Level Set Mode

    SET MODE ■ Level set mode S S S S B B T T x x T T o o n n e e ( ( B B a a s s s s ) ) This item adjusts the bass level of the transmit audio tone in SSB mode from –5 dB to +5 dB in 1 dB steps.
  • Page 101 ■ Level set mode (continued) S S S S B B T T B B W W ( ( N N A A R R ) ) H H These items set the transmission passband width for narrow setting by selecting the lower and higher fre- quencies.

  • Page 102: Display Set Mode

    SET MODE ■ Display set mode To adjust the LCD contrast or backlight, wait until the LCD becomes stable (10 min. or more after turn- ing power ON). This is an inherent characteristic of LCDs and LCD backlights and does not indicate a transceiver malfunction.

  • Page 103: Selected

    ■ Display set mode (continued) S S c c r r e e e e n n S S a a v v e e r r F F u u n n c c t t i i o o n n This item sets the screen saver setting from 60 min, 30 min, 15 min and OFF.

  • Page 104: Dsp Filter Set Mode

    SET MODE ■ DSP filter set mode To suit your operating style, the type of DSP filter shape for SSB and CW can be selected. q Push the [EXIT/SET] several times to close a multi-function screen, if necessary. w Push the [EXIT/SET] switch for 1 sec. to enter set mode.
  • Page 105 ■ Miscellaneous (others) set mode Q Q u u i i c c k k D D u u a a l l w w a a t t c c h h When this item is set to ON, pushing [DUALWATCH] for 1 sec.
  • Page 106 SET MODE ■ Miscellaneous (others) set mode T T u u n n e e r r ( ( A A u u t t o o S S t t a a r r t t ) ) The internal antenna tuner has an automatic start ca- pability which starts tuning if the SWR is higher than 1.5–3:1.
  • Page 107 ■ Miscellaneous (others) set mode S S P P E E E E C C H H L L a a n n g g u u a a g g e e When the optional UT-102 VOICE SYNTHESIZER UNIT installed, you can select between English and Japan- ese as the language.
  • Page 108 SET MODE ■ Miscellaneous (others) set mode M M A A I I N N D D I I A A L L A A u u t t o o T T S S This item sets the auto tuning step function. When ro- tating the tuning dial rapidly, the tuning step automat- ically changes several times as selected.
  • Page 109 To distinguish equipment, each CI-V transceiver has its own Icom standard address in hexadecimal code. The IC-756PROIII’s address is 6Eh. When 2 or more IC-756PROIII’s are connected to an optional CT-17 V LEVEL CONVERTER ing dial to select a different address for each IC- 756PROIII in the range 01h to 7Fh.

  • Page 110: Option Installation

    OPTION INSTALLATION ■ Opening the transceiver’s cases Follow the case and cover opening procedures shown here when you want to install an optional unit or adjust the internal units, etc. q Remove 2 screws from the left side of the trans- ceiver to remove the carrying handle as shown below.

  • Page 111: Internal Views

    • Top view PA unit PA fuse (FGB 5 A) • Bottom view RF unit BPF unit PRE AMP unit PLL unit INTERNAL VIEWS Internal antenna tuner FILTER unit Clock backup battery SPCH Optional voice synthesizer level adj. Space for optional voice synthesizer (UT-102) DSP unit...

  • Page 112: Maintenance

    If you are unable to locate the cause of a problem or solve it through the use of this chart, contact your near- est Icom Dealer or Service Center. POSSIBLE CAUSE • Re-connect the DC power cable correctly.

  • Page 113: Fuse Replacement

    CAUTION: DISCONNECT the DC power cable from the transceiver when changing a fuse. The IC-756PROIII has 2 types of fuses installed for transceiver protection. • DC power cable fuses ... FGB 30 A • Circuitry fuse ... FGB 5 A CIRCUITRY FUSE REPLACEMENT The 13.8 V DC from the DC power cable is conver...

  • Page 114: Tuning Dial Brake Adjustment

    MAINTENANCE ■ Tuning dial brake adjustment The tension of the tuning dial may be adjusted to suit your preference. The brake adjustment screw is located on the right side of the tuning dial. See the figure at right. Turn the brake adjustment screw clockwise or coun- terclockwise to obtain a comfortable tension level while turning the dial continuously and evenly in one direction.

  • Page 115: Control Command

    RS-232C port. The Icom Communi- cations Interface-V (CI-V) controls the following func- tions of the transceiver. Up to 4 Icom CI-V transceivers or transceivers can be connected to a personal computer equipped with an RS-232C port. See p. 104 for setting the CI-V condi- tion using set mode.
  • Page 116 CONTROL COMMAND • Command table Command Sub command — Send frequency data Same as Send mode data command 06 — Read band edge frequencies — Read operating frequency — Read operating mode — Set frequency data Select LSB Select USB Select AM Select CW Select RTTY...
  • Page 117 • Command table (continued) Command Sub command Noise blanker (0=OFF; 1=ON) Noise reduction (0=OFF; 1=ON) Auto notch (0=OFF; 1=ON) Repeater tone (0=OFF; 1=ON) Tone squelch (0=OFF; 1=ON) Speech compressor (0=OFF; 1=ON) Monitor (0=OFF; 1=ON) VOX function (0=OFF; 1=ON) Break-in (0=OFF; 1=semi break- in;...
  • Page 118 CONTROL COMMAND • Command table (continued) Command Sub command 0544 Send/read TX spectrum scope set (0=OFF, 1=ON) 0545 Send/read spectrum scope max. hold set (0=OFF, 1=ON) 0546 Send/read voice auto monitor set (0=OFF, 1=ON) 0547 Send/read cut number style (0=Normal, 1=190→ANO, 2=190→ANT, 3=90→NO, 4=90→NT) 0548...
  • Page 119 • To send/read memory contents When sending or reading memory contents, additional code as follows must be added to appoint the memory channel. ➥ Additional code: 0000–0101 (0100=P1, 0101=P2) • Band stacking register To send or read the desired band stacking register’s con- tents, combined code of the frequency band and register codes as follows are used.

  • Page 120: Specifications

    SPECIFICATIONS • General • Frequency coverage : (unit: MHz) Receiver 0.030–60.000* Transmitter 1.800–1.999* 5.33050* , 5.34650* 5.37150* , 5.40350* 7.000–7.300* , 10.100–10.150* 14.000–14.350* 21.000–21.450* 28.000–29.700* Some frequency bands are not guaranteed. Depending on version. USA version only. • Mode : USB, LSB, CW, RTTY, AM, FM •...

  • Page 121: Options

    • Input impedance: 8 Ω • Max. input power: 4 W •About DC power supply The use of IC-756PROIII (#33, #34, #35, #38, #40) in com- bination with the DC power supply complies with European Harmonised Standard regulations under the conditions listed below.

  • Page 122: About Ce

    Similarly some types of transmitter, SSB, CW, AM etc. have a lower ‘average’ output power and the assessed risk is even lower. Versions of the IC-756PROIII which display the “CE” symbol on the serial number seal, comply with the essential requirements of the European Radio and Telecommunication Terminal Directive 1999/5/EC.
  • Page 123 We Icom Inc. Japan 1-1-32, Kamiminami, Hirano-ku Osaka 547-0003, Japan Declare on our sole responsibility that this equipment complies with the essential requirements of the Radio and Telecommunications Terminal Equipment Directive, 1999/5/EC, and that any applicable Essential Test Suite measurements have been performed.
  • Page 124 ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ A-6378H-1EX Printed in Japan © 2004 Icom Inc. ■ ■ ESP ■ SWE ■ ■ POR ■ DEN ■ ■ ITA ■ FIN ■ ■ ■ ■...

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