INSTRUCTION MANUAL HF/50 MHz ALL MODE TRANSCEIVER This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
IMPORTANT READ THIS INSTRUCTION MANUAL CAREFULLY before attempting to operate the transceiver. WORD DEFINITION R WARNING Personal injury, fire hazard or electric shock may occur. SAVE THIS INSTRUCTION MANUAL. This CAUTION manual contains important safety and operating instructions for the IC-756PROIII. NOTE FOREWORD We understand that you have a choice of many different radios in the market place.
PRECAUTIONS R WARNING RF EXPOSURE! This device emits Radio Frequency (RF) energy. Extreme caution should be observed when operating this device. If you have any questions regarding RF exposure and safety standards please refer to the Federal Communications Commission Office of Engineering and Technology’s report on Evaluating Compliance with FCC Guidelines for Human Radio Frequency Electromagnetic Fields (OET Bulletin 65).
TABLE OF CONTENTS IMPORTANT .................................................................. i FOREWORD ................................................................. i EXPLICIT DEFINITIONS ............................................... i SUPPLIED ACCESSORIES .......................................... i PRECAUTIONS ............................................................ ii TABLE OF CONTENTS .............................................. iii 1 PANEL DESCRIPTION ....................................
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 ■ Transmit filter width setting (SSB only) ..........
1 PANEL DESCRIPTION ■ Front panel !2 !0 HF/50MHz TRANSCEIVER TIMER q !1 POWER TRANSMIT w PHONES TUNER MONITOR NB NR e ELEC-KEY AF RF/SQL BAL NR r MIC t MIC GAIN RF POWER F-1 F-2 F-3 F-4 F-5 SSB CW/RTTY AM/FM FILTER EXIT/SET COMP BK-IN DELAY KEY SPEED y u io q POWER SWITCH [POWER•TIMER] ❍ While transceiver’s power is OFF: Push to turn power ON. • Turn the optional DC power supply ON in advance. • A/D converter calibration of the DSP unit starts and it takes approx. 10 sec.
PANEL DESCRIPTION i RF GAIN CONTROL/SQUELCH CONTROL [RF/SQL] (outer control) Adjusts the RF gain and squelch threshold level. The squelch removes noise output from the speaker (closed condition) when no signal is received. • The squelch is particularly effective for FM. It is also available for other modes. • 12 to 1 o’clock position is recommended for any setting of the [RF/SQL] control.
1 PANEL DESCRIPTION ■ Front panel (continued) @0 !9 !8 !7 !6 HF/50MHz TRANSCEIVER TIMER POWER TRANSMIT PHONES ELEC-KEY TUNER MONITOR AF RF/SQL NB BAL NR NR MIC MIC GAIN RF POWER F-1 F-2 F-3 F-4 F-5 SSB CW/RTTY AM/FM FILTER EXIT/SET COMP BK-IN DELAY KEY SPEED !3 !4 !5 !3 COMPRESSION LEVEL CONTROL [COMP] (p. 68) Adjusts the speech compression level in SSB.
PANEL DESCRIPTION AGC MID ➥ Activates or selects fast, middle or slow AGC time constant when pushed. (p. 59) 1/4 OFF • “FAST” is only available for FM mode. TONE OFF ✔ What is the AGC? The AGC function 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.
1 PANEL DESCRIPTION ■ Front panel (continued) #6 TWIN PBT EIVER SPLIT 1.8 1 3.5 2 7 3 DUAL WATCH 10 4 14 5 18 6 Z 21 7 24 8 28 9 MW 50 0 F-INP ENT CHANGE Y PBT CLR VFO/ MEMO M.
1 PANEL DESCRIPTION ∂TX] (p. 69) @9 ∂TX SWITCH [∂ ➥ Turns the ∂TX function ON and OFF when pushed. ∂TX] control to vary the ∂TX frequency. • Use the [RIT/∂ ➥ Adds the ∂TX shift frequency to the operating frequency when pushed for 1 sec. ✔ What is the ∂TX function? #4 NOTCH SWITCH [NOTCH] (p. 64) ➥ Switches 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.
1 PANEL DESCRIPTION ■ Front panel (continued) %3 %2 %1 %0 $9 $8 $7 $5 $6 TWIN PBT CEIVER SPLIT 1.8 1 3.5 2 7 3 Y DUAL WATCH 10 4 14 5 18 6 Z 21 7 24 8 28 9 50 0 F-INP ENT CHANGE $4 MW PBT CLR GENE VFO/ MEMO M.
PANEL DESCRIPTION $6 KEYPAD ➥ Pushing a key selects the operating band. • [(GENE)•] selects the general coverage band. ➥ Pushing the same key 2 or 3 times calls up other stacked frequencies in the band. (p. 24) • Icom’s triple band stacking register memorizes 3 frequencies in each band. ➥ After pushing [(F-INP)ENT], enters a keyed frequency or memory channel. Pushing [(FY]/[Z Z] is necessary at the end. INP)ENT] or [Y (pgs. 25, 77) • e.g. to enter 14.
1 PANEL DESCRIPTION ■ LCD display !6 !5 q w e w ANT 1 METER Po BW 2.4k SFT TX VFO VOX OFF COMP OFF WIDE SPAN o qw:pp 0 USB 1ß P.AMP 1 AGC MID !0 23:00 FIL2 qr.qqy.pp 21.085.00 56ß USB CW VFO 21.085.00 -12.5k Grid 10k 10dB ATT 10dB i u FIL2 qr.qpp.pp ATT OFF r !4 !3 !2 !1 i u CW SPECTRUM SCOPE +12.5k y SUB MARKER HOLD ATT MARKER HOLD SET t q TX INDICATOR Indicates the frequency readout for transmission. w VFO/MEMORY CHANNEL INDICATOR (pgs.
PANEL DESCRIPTION 1 ■ Screen menu arrangement The following screens can be selected from the start up screen. Choose the desired screen using the following chart. 1 Pushing [EXIT/SET] several times returns to the start up screen. See p. 94 for set mode arrangement. • Start up screen ANT 1 BW 2.4k SFT T X VFO METER Po P.AMP 1 qw:pp 0 CW 12:00 FIL2 qr.qpp.pp CW --. ---. -- 1 VFO USB FIL2 qr.qpp.pp ATT 0FF 1 CW --. ---. -- • Spectrum scope screen (p.
1 PANEL DESCRIPTION ■ Rear panel !4 !3 !2 qw !1 e q TRANSVERTER JACK [XVERT] (p. 18) External transverter input/output jack. Activated by voltage applied to [ACC(2)] pin 6. w RECEIVE ANTENNA CONNECTOR [RX ANT] (p. 15) Connects a 50 Ω general coverage antenna with an RCA connector. e TUNER CONTROL SOCKET [TUNER] (p. 15) Accepts the control cable from an optional AH-4 HF/50 MHz AUTOMATIC ANTENNA TUNER or AH-3 HF AUTOMATIC ANTENNA TUNER.
PANEL DESCRIPTION !2 ANTENNA CONNECTOR 1 [ANT1] !3 ANTENNA CONNECTOR 2 [ANT2] (pgs. 13, 14) Accept a 50 Ω antenna with a PL-259 connector. 1 !4 GROUND TERMINAL [GND] (pgs. 13, 14) Connect this terminal to a ground to prevent electrical shocks, TVI, BCI and other problems. 1 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.
2 INSTALLATION AND CONNECTIONS ■ Unpacking ■ Antenna connection After unpacking, immediately report any damage to the delivering carrier or dealer. Keep the shipping cartons. 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.
2 INSTALLATION AND CONNECTIONS ■ Required connections • Front panel 2 CW KEY TIMER TWIN PBT HF/50MHz TRANSCEIVER POWER 1 0 S 9 5 10 Po 1 1.5 SWR 0 COMP ALC TRANSMIT + 20 25 50 + 40 SPLIT 1.8 1 3.5 2 7 3 DUAL WATCH 10 4 14 5 18 6 21 7 24 8 28 50 0 F-INP + 60dB 100 2 3 20 10 dB CHANGE 9 MW ENT M-CL PBT CLR VFO/ MEMO M.
2 INSTALLATION AND CONNECTIONS ■ Advanced connections • Front panel TIMER HEADPHONES TWIN PBT HF/50MHz TRANSCEIVER POWER 1 0 S 5 9 10 25 50 Po 1 1.5 SWR 0 COMP ALC TRANSMIT 2 10 3 + 20 + 40 SPLIT 1.8 1 3.5 2 7 3 DUAL WATCH 10 4 14 5 18 6 21 7 24 8 28 50 0 F-INP + 60dB 100 20 dB CHANGE 9 MW ENT M-CL PBT CLR VFO/ MEMO M.
INSTALLATION AND CONNECTIONS ■ Power supply connections 2 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. Use the optional PS-125 DC power supply with a 25 A capacity when operating the transceiver with AC power. Refer to the diagrams below.
2 INSTALLATION AND CONNECTIONS ■ Linear amplifier connections Use the [ANT1] connector when connecting a linear amplifier. CONNECTING THE IC-PW1/EURO Remote control cable (supplied with the IC-PW1/EURO) To an antenna ACC-1 ACC cable (supplied with the IC-PW1/EURO) Be sure to connect the cable to the 7-pin ACC(2) jack.
INSTALLATION AND CONNECTIONS 2 ■ External antenna tuner connection CONNECTING THE AH-4/AH-3 2 The AH-4 or AH-3 must be connected to [ANT1]. Long wire or optional AH-2b Coaxial cable (from the AH-4 or AH-3) ANT1 Control cable Transceiver Ground AH-4 or AH-3 ■ Transverter jack information When 2 to 13.8 V is applied to pin 6 of [ACC(2)], the [XVERT] jack is activated for transverter operation and the antenna connectors do not receive or transmit any signals. (p.
2 INSTALLATION AND CONNECTIONS ■ FSK and AFSK (SSTV) connections To connect a terminal unit, TNC or scan converter, refer to the diagram below. For RTTY operation: Narrow filter settings may not pass RTTY signals. Be sure to select the appropriate IF filter settings corresponding to the signal width. (p.
INSTALLATION AND CONNECTIONS 2 ■ Accessory connector information ACC (1) 2 4 5 1 8 3 6 7 PIN No. NAME RTTY Controls RTTY keying “High” level “Low” level Output current 2 GND Connects to ground. Connected in parallel with ACC(2) pin 2. 3 Input/output pin. SEND Goes to ground when transmitting. When grounded, transmits. Ground level : –0.5 V to 0.8 V Output current : Less than 20 mA Input current (Tx) : Less than 200 mA Connected in parallel with ACC(2) pin 3. 4 MOD 5 AF 6 SQLS 7 13.
3 BASIC OPERATION ■ When first applying power (CPU resetting) 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 following procedure. [POWER] [F-INP] [M-CL] Resetting CLEARS all programmed contents in memory channels and returns programmed values in set mode to default values. q Make sure the transceiver power is OFF. w While pushing [M-CL] and [(F-INP)ENT], push [POWER] to turn power ON.
BASIC OPERATION 3 ■ 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-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. 82) or the memory transfer function (see p. 80).
3 BASIC OPERATION ■ Selecting VFO/memory mode [VFO/MEMO] ➥ Push [VFO/MEMO] to switch between VFO and memory modes. • “VFO” appears when VFO mode, or the selected memory channel number appears when memory mode is selected beside the frequency readout. • Pushing [VFO/MEMO] for 1 sec. transfers the contents of the selected memory channel to VFO mode. (p. 80) “VFO” indicator ANT 1 BW 500 TX TX METER Po SFT VFO 0 CW BPF qw:pp 12:00 FIL2 qr.qot.pp 14.100.00 1 USB Memory channel number ANT 1 BW 2.
BASIC OPERATION 3 ■ Selecting an operating band Band keys The triple band stacking register provides 3 memories in one band. 3 sets of a frequency and operating mode on each band are automatically stored when used. If a band key is pushed once, the frequency and operating mode last used are called up. When the key is pushed again, another stored frequency and operating mode are called up. 3 This function is convenient when you operate 3 operating modes on one band.
3 BASIC OPERATION ■ Frequency setting The transceiver has several tuning methods for convenient frequency tuning. D Tuning with the tuning dial Band keys q Push the desired band key on the keypad 1–3 times. • 3 different frequencies can be selected on each band with the band key. (See previous page “Using the band stacking register.”) ANT 1 BW 2.4k SFT T X VFO qw:pp 0 USB 12:00 FIL2 wq.wpp.pp METER Po CW 21.076.50 1 Tuning dial w Rotate the tuning dial to set the desired frequency.
BASIC OPERATION 3 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. q Push [TS] momentarily to turn the quick tuning function ON. • “Z” appears when the quick tuning function ON. Quick tuning indicator [TS] BW 2.4k SFT ANT 1 TX METER Po VFO qw:pp 0 USB 3 12:00 FIL2 qr.qpp.pp 21.076.50 1 CW w Rotate the tuning dial to change the frequency in programmed kHz steps.
3 BASIC OPERATION D Selecting 1 Hz step The minimum tuning step of 1 Hz can be used for fine tuning. [TS] q Push [TS] to turn OFF the quick tuning step. • “▼” does not appear. w Push [TS] for 1 sec. to turn the 1 Hz tuning step ON and OFF. • RIT and/or ∂TX also functions in 1 Hz tuning step when used. 1 Hz step indicator ANT 1 METER Po BW 2.4k SFT T X VFO TX 12:00 FIL2 qr.qot.ppp 14.100.00 1 P.AMP 1 Tuning dial qw:pp 0 USB VFO USB USB FIL2 qr.wpt.ppp ATT 0FF 1 14.100.
BASIC OPERATION 3 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] Tuning dial [(F-5)OTHERS] q Push [EXIT/SET] several times to close a multifunction screen, if necessary. w Push [EXIT/SET] for 1 sec. to select the set mode menu screen. e Push [(F-5)OTHERS] to enter miscellaneous (others) set mode. Y] or [(F-2)Z Z] to select “MAIN DIAL r Push [(F-1)Y Auto TS.
3 BASIC OPERATION ■ 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 available in the IC-756PROIII. Select the desired operation mode as follows. To select a mode of operation, push the desired mode switch momentarily. Push the switch again to toggle between USB and LSB, CW/CW-R and RTTY/RTTYR, AM and FM, if necessary. Push the switch for 1 sec.
BASIC OPERATION 3 ■ 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 available for other modes. • 12 to 1 o’clock position is recommended for any setting of the [RF/SQL] control.
3 BASIC OPERATION ■ Meter function The transceiver has 4 transmit meter functions for your convenience. Select the desired meter with the [METER] switch. In addition, the transceiver can display the multi-function digital meter in the LCD display, which displays all transmit meters simultaneously. • Analog transmit meter • Multi-function digital meter ➥ Push [METER] to select RF power (Po), SWR, ALC or compression level (COMP). q Push [METER] for 1 sec. to turn the multi-function digital meter ON.
BASIC OPERATION 3 ■ Basic transmit operation Before transmitting, monitor your selected operating 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” once or twice, before you being operating on that frequency.
4 RECEIVE AND TRANSMIT ■ Operating SSB q Push a band key to select the desired band. w Push [SSB] to select LSB or USB. [TRANSMIT] [TX] indicator [RX] indicator Band keys • “LSB” or “USB” appears. • Below 10 MHz LSB is automatically selected; above 10 MHz USB is automatically selected. e Rotate the tuning dial to tune a desired signal. • The S-meter indicates received signal strength when signal is received.
RECEIVE AND TRANSMIT 4 D Convenient functions for transmit • Speech compressor (p. 68) ➥ Push [COMP] to turn the speech compressor ON and OFF. • VOX (voice operated transmit) (p. 66) ➥ Push [VOX] to turn the VOX function ON and OFF. • Pushing [COMP] for 1 sec. to select the compression bandwidth from wide, middle and narrow. • “VOX ON” appears when the VOX function is set to ON. • Transmit quality monitor (p. 70) ➥ Push [MONITOR] to turn the monitor function ON and OFF. • Audio tone control (p.
4 RECEIVE AND TRANSMIT ■ Operating CW q Push a band key to select the desired band. w Push [CW/RTTY] to select CW. [TRANSMIT] [TX] indicator [RX] indicator Band keys • After CW mode is selected, push [CW/RTTY] for 1 sec. to toggle between CW and CW-R modes. • “CW” or “CW-R” appears. e Rotate the tuning dial to simultaneously tune a desired signal and its side tone. • The S-meter indicates received signal strength when signal is received.
RECEIVE AND TRANSMIT 4 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, respectively. 4 D About CW reverse mode CW-R (CW Reverse) mode receives CW signals with a reverse side CW carrier point like that of LSB and USB modes.
4 RECEIVE AND TRANSMIT D About CW pitch control 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 operating frequency. ➥ Rotate [CW PITCH] to suit your preference. • Adjustable within 300 to 900 Hz in 25 Hz steps. [CW PITCH] The filter set mode screen graphically displays the CW pitch operations. (See at left.
RECEIVE AND TRANSMIT 4 ■ Electronic CW keyer The IC-756PROIII has a number of convenient functions for the electronic keyer that can be accessed from the memory keyer menu. [(F-1)]–[(F-4)] q Push [EXIT/SET] several times, if necessary. w Push [CW/RTTY] to select CW mode. e Push [(F-3)KEYER] then [EXIT/SET] to select memory keyer menu screen. r Push one of the multi-function keys ([F-1] to [F-4]) to select the desired menu. See the diagram below.
4 RECEIVE AND TRANSMIT 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] AGC MID BK-IN OFF MEMORY KEYER MEMORY M2 CFM M3 1/4 OFF ICOM ICOM TU QRZ? M4 M1 DE M2 M3 M4 q Push [EXIT/SET] several times, if necessary. w Push [CW/RTTY] to select CW mode. e Push [(F-3)KEYER] to select the memory keyer screen.
RECEIVE AND TRANSMIT 4 D Editing a memory keyer The contents of the momory keyer memories can be set using the memory keyer edit menu. The memory keyer can memorize and re-transmit 4 CW key codes for often-used CW sentences, contest number, etc. Total capacity of the memory keyer is 70 characters per memory channel. [123]/[etc] [ABC] [(F-3)DEL] [(F-4)SPACE] • Programming contents q Push [EXIT/SET] several times, if necessary. w Push [CW/RTTY] to select CW mode.
4 RECEIVE AND TRANSMIT 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)∫] AGC MID BK-IN OFF [(F-2)√] [EXIT/SET] KEYER 001 N u m b e r Style Style C o u n t UP U P Trigger Trigger P r e s e n t Number Number Normal N ormal M2 001 • Setting the contact (serial) number Contact number can be automatically transmitted from one of the memory keyer channels. The Morse cut numbers can be used as the contact numbers.
RECEIVE AND TRANSMIT 4 D Keyer set mode This set mode is used to set the CW side tone, memory keyer repeat time, dash weight, paddle specifications, keyer type, etc. [(F-3)DEF] • Setting the electronic keyer q Push [EXIT/SET] several times, if necessary. w Push [CW/RTTY] to select CW mode. e Push [(F-3)KEYER] then [EXIT/SET] to select keyer set mode. r Push [(F-4)CW KEY] to select memory keyer set mode. Y] or [(F-2)Z Z] to select the desired set t Push [(F-1)Y item.
4 RECEIVE AND TRANSMIT D Keyer set mode (continued) Rise Time (Rise time) This item sets the envelop time period which the output power becomes the set transmit power. • 2, 4, 6, or 8 msec. can be selected. • Push [(F-3)DEF] for 1 sec. to select a default setting. (default: 4 sec.) • About rise time Key action Tx Rx Set Tx power level Tx output power 0 Rise time Time Paddle Polarity (Paddle polarity) This item sets the paddle polarity. • Normal and reverse pooarity can be selected.
RECEIVE AND TRANSMIT ■ Operating RTTY (FSK) [TRANSMIT] [TX] indicator [RX] indicator Band keys 4 When using your RTTY terminal or TNC, consult the manual that comes with the RTTY terminal or TNC. q Push a band key to select the desired band. w Push [CW/RTTY] to select RTTY. • After RTTY mode is selected, push [CW/RTTY] for 1 sec. to toggle between RTTY and RTTY-R modes. • “RTTY” or “RTTY-R” appears. e Push [(F-3)DECODE] to display the decoder screen. 4 • The IC-756PROIII has a Baudot decoder.
4 RECEIVE AND TRANSMIT 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. Normal 170 Hz • Check the receive signal. Reverse 2125 Hz Space Mark q Push [CW/RTTY] once or twice to select RTTY mode. w Push [CW/RTTY] for 1 sec. to select RTTY or RTTY-R mode.
RECEIVE AND TRANSMIT 4 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 controller (TNC) is not necessary for receiving a Baudot signal. q Push [EXIT/SET] several times to close a multifunction screen, if necessary. w Push [CW/RTTY] to select RTTY mode. e Push [(F-3)DECODE] to turn the RTTY decoder ON.
4 RECEIVE AND TRANSMIT D RTTY memory transmission Pre-set characters can be sent using the RTTY memory. Contents of the memory are set using the edit menu. [(F-1)RT1]–[(F-4)RT4] [(F-1)RT5]–[(F-4)RT8] ANT 1 BW 350 RT1 12:00 FIL2 CW 21. 085. 00 VFO USB FIL2 qr.qpp.pp ATT 0FF 1/4 OFF qw:pp 0 RTTY RTTY 1 P.AMP 1 RTTY FIL ON • The selected memory contents will be transmitted immediately. qr.qpp.
RECEIVE AND TRANSMIT 4 D Editing RTTY memory The contents of the RTTY memories can be set using the memory edit menu. The memory can memorize and re-transmit 8 RTTY contents for often-used RTTY sentences. Total capacity of the memory is 70 characters per memory channel. [(F-3)DEL] [(F-4)SPACE] [123]/[etc] [ABC] • Programming contents q Push [EXIT/SET] several times, if necessary. w Push [CW/RTTY] to select RTTY mode. e Push [(F-3)DECODE] then [(F-1)MENU1] to select the RTTY decode menu 2.
4 RECEIVE AND TRANSMIT D RTTY decoder set mode This set mode is used to set the decode USOS function, etc. [(F-3)DEF] • Setting the contents q Push [EXIT/SET] several times, if necessary. w Push [CW/RTTY] to select RTTY mode. e Push [(F-3)DECODE] then [(F-1)MENU1] to select RTTY decode menu 2. r Push [(F-4)SET] to select RTTY decode set mode. Y] or [(F-2)Z Z] to select the desired set t Push [(F-1)Y item. y Set the desired condition using the tuning dial. • Push [(F-3)DEF] for 1 sec.
RECEIVE AND TRANSMIT ■ Operating AM 4 q Push a band key to select the desired band. w Push [AM/FM] to select AM. [TRANSMIT] [TX] indicator [RX] indicator Band keys • “AM” indicator appears. • After AM mode is selected, push [AM/FM] to toggle between AM and FM modes. e Rotate the tuning dial to tune a desired frequency. • The S-meter indicates received signal strength when signal is received. [AF] [MIC GAIN] [AM/FM] Tuning dial r Rotate [AF] to set audio to a comfortable listening level.
4 RECEIVE AND TRANSMIT ■ Operating FM q Push a band key to select the desired band. w Push [AM/FM] to select FM. [TRANSMIT] [TX] indicator [RX] indicator Band keys • “FM” indicator appears. • After FM mode is selected, push [AM/FM] to toggle between FM and AM modes. e Rotate the tuning dial to tune a desired frequency. • The S-meter indicates received signal strength when signal is received. • 10 kHz tuning step is preset for FM mode.
RECEIVE AND TRANSMIT 4 ■ 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 frequency by an offset frequency. A repeater can be accessed using split frequency operation with the shift frequency set to the repeater’s offset frequency. For accessing a repeater which requires a repeater tone, set the repeater tone frequency in set mode as described below.
4 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. q Set the desired frequency band and select FM mode. w Push [TONE] several times until “TSQL” appears. ANT 1 15k SFT BW VFO TX TX [VFO/MEMO] [SPLIT] Band keys METER Po qw:pp 0 FM FIL2 12:00 TSQL wo.yip.pp 14.100.00 1 P.AMP 1 VFO FM USB FIL2 TSQL wo.tip.pp ATT OFF 1 14.100.
RECEIVE AND TRANSMIT 4 ■ Data mode (SSTV/PSK31) operation [TRANSMIT] [TX] indicator [RX] indicator Band keys When operating SSTV or PSK31 with your PC software, consult the manual that comes with the software. q Connect a PC to the transceiver. (p. 19) w Push a band key to select the desired band. e Push [SSB] or [AM/FM] to select the desired operating mode. r Push the same key for 1 sec. to turn data mode ON. 4 • “-D” indicator additionally appears.
5 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. [(F-3)MARKER] [(F-4)HOLD] q Push [EXIT/SET] several times to close a multifunction screen, if necessary. w Push [(F-1)SCOPE] to select the scope screen. e Push [(F-1)SPAN] several times to select the scope span.
FUNCTION FOR RECEIVE 4 D Scope set mode The spectrum scope shows the transmit signal waveform while transmitting. This can be deactivated if desired. The spectrum scope shows the transmit signal waveform while transmitting. This can be deactivated if desired. When “OFF” is selected, the spectrum scope holds the received waveform while transmitting and does not show the transmit waveform.
5 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 receiving weak signals. [P.AMP] ➥ Push [P.AMP] several times to set the preamp OFF, preamp 1 ON or preamp 2 ON. • “P. AMP1” activates 10 dB preamp for HF all bands. • “P. AMP2” activates 16 dB high-gain preamp for 24 MHz band and above. Regarding the use of the “P.AMP 2” (Pre-amplifier 2) The “P.
FUNCTION FOR RECEIVE 5 ■ RIT function The RIT (Receive Increment Tuning) function compensates 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 frequency. • See #1 on p. 5 for function description. [CLEAR] q Push [RIT] to turn the RIT function ON and OFF. • “ RIT ” and the shifting frequency appear when the function is ON. ANT 1 BW 2.
5 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. [AGC] The transceiver has 3 AGC characteristics (time constant; fast, mid, slow) for non-FM mode. The FM mode AGC time constant is fixed as ‘FAST’ (0.1 sec.) and AGC time constant cannot be selected. [(F-3)DEF] [EXIT/SET] • AGC time constant selection • Setting the AGC time constant q Select non-FM mode.
FUNCTION FOR RECEIVE 5 ■ Twin PBT operation General PBT (Passband Tuning) function electronically narrows the IF passband width by shifting the IF frequency to slightly outside of the IF filter passband to reject interference. This transceiver uses the DSP circuit for the PBT function. Moving both [TWIN PBT] controls to the same position shifts the IF. [TWIN PBT] ➥ The LCD shows the passband width and shift frequency graphically. ➥ Push [FILTER] for 1 sec. to enter the filter set mode.
5 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. For RTTY mode, the passband width can be set within 50 to 2700 Hz in 50 or 100 Hz steps. A total of 32 passband widths are available. For AM and FM modes, the passband width is fixed and 3 passband widths are available.
FUNCTION FOR RECEIVE 5 ■ DSP filter shape The type of DSP filter shape for each SSB and CW can be selected independently from soft and sharp. q Push [EXIT/SET] several times to close a multifunction screen, if necessary. w Push [EXIT/SET] switch for 1 sec. to enter set mode. e Push [(F-3)DSP] to enter the DSP filter set mode. r Push one of [(F-2)SSB-FIL] or [(F-4)CW-FIL] to select the desired DSP filter shape from sharp and soft for each SSB or CW mode, respectively.
5 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 circuit is selected for the main readout frequency. q Set a desired frequency. w Push [DUALWATCH] for 1 sec. • Equalized receive frequency and “ DUAL-W ” appear in the LCD. This quick dualwatch function can be turned OFF in set mode. (p.
FUNCTION FOR RECEIVE 5 ■ Noise blanker The noise blanker eliminates pulse-type noise such as from car ignitions. The noise blanker is not available for FM mode. q Push [NB] to turn the noise blanker ON. • [NB] indicator lights. w Push [NB] for 1 sec. to enter the noise blanker level set mode. e Rotate the tuning dial to adjust the noise blanker level. • Push [(F-3)DEF] for 1 sec. to return to default value. r Push [NB] to turn the noise blanker OFF. 5 • [NB] indicator goes off.
5 FUNCTION FOR RECEIVE ■ Noise reduction The noise reduction function reduces noise components 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 ON. • [NR] indicator lights. w Rotate the [NR] control to adjust the noise reduction level. e Push the [NR] switch to turn the noise reduction OFF. • [NR] indicator lights off.
FUNCTION FOR TRANSMIT 6 ■ VOX function The VOX (Voice-Operated Transmission) function switches between transmit and receive with your voice. This function provides an opportunity to input log entries into your computer, etc., while operating. D Using the VOX function q Select a phone mode (SSB, AM, FM). w Push [VOX] to turn the VOX function ON or OFF. [VOX] • “VOX ON” appears while the VOX is in use. 5 6 D Adjusting the VOX function q Select a phone mode (SSB, AM, FM).
6 FUNCTION FOR TRANSMIT ■ Break-in function The break-in function is used in CW mode to automatically toggle the transceiver between transmit and receive 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 selects transmit when keying, then automatically returns to receive after a pre-set time from when you stop keying. [BK-IN] q Push [CW/RTTY] to select CW or CW-R mode.
FUNCTION FOR TRANSMIT 6 ■ Transmit filter width setting (SSB only) The transmit filter width for SSB mode can be selected from wide, middle and narrow. ➥ During USB or LSB mode selection, push [COMP] for 1 sec. several times to select the desired transmit filter width from wide, middle and narrow. • The filter functions regardless of the speech compressor use. • The following filters are specified as the default. Each of the filter width can be re-set in level set mode. (pgs. 95, 96) WIDE : 100 Hz to 2.
6 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 cancelling the 1 Hz step readout) without moving the receive frequency. • See @9 on p. 5 for function description. ∂TX] switch. q Push [∂ • “ ∂TX TX ” and the shifting frequency appear when the function is ON. ANT 1 BW 2.4k SFT T X VFO TX 12:00 FIL2 qr.qot.pp METER Po 14.100.00 1 [CLEAR] qw:pp 0 USB P.AMP 1 USB : TX q.wt Appear ∂TX] control.
FUNCTION FOR TRANSMIT 6 ■ Monitor function The monitor function allows you to monitor your transmit 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 functions regardless of the [MONITOR] switch setting. [PHONES] jack q Push [MONITOR]. • The indicator (in [MONITOR] switch) lights when the monitor function is ON. w Push [EXIT/SET] several times to close a multifunction screen, if necessary.
6 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. [SPLIT] [(F-INP)ENT] The following is an example of setting 21.290 MHz for receiving and 21.310 MHz for transmitting. [CHANGE] [XFC] q Set 21.290 MHz (USB) in VFO mode. ANT 1 BW 2.4k SFT TX TX VFO qw:pp 0 USB CONVENIENT 12:00 FIL2 wq.
FUNCTION FOR TRANSMIT 6 ■ Quick split function When you find a DX station, an important consideration is how to set the split frequency. [SPLIT] [(F-INP)ENT] When you push the [SPLIT] switch for 1 sec., split frequency operation is turned ON, the sub readout is equalized to the main readout frequency and enters standby for transmit frequency input. This shortens the time needed to start split frequency operation. [CHANGE] [XFC] The quick split function is ON by default.
7 VOICE RECORDER FUNCTIONS ■ Digital voice recorder The transceiver has a total of 8 memory channels, 4 each for transmit and receive, of digital voice memories. A maximum message length of 15 sec. can be recorded in each receive channel, and a total message length of 90 sec. can be recorded in transmit channels. Providing a transmission memory is very convenient for repeated CQ and number transmissions at contest times, as well as when making consecutive calls in DX’pedition.
VOICE RECORDER FUNCTIONS 7 ■ Digital voice recorder (continued) • 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 signal to start recording. • “REC” flashes. • Records audio into the channel R4. w Push [REC/PLAY] momentarily to stop recording. [REC/PLAY] • Recording is automatically terminated after 30 min. IMPORTANT! Push [REC/PLAY] to stop recording before, or when 15 sec.
7 VOICE RECORDER FUNCTIONS ■ Digital voice recorder (continued) • 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 multifunction screen, if necessary. w Push [(F-2)VOICE] to call up the voice recorder screen. r Push the desired memory channel switch, [(F-1)T1] – [(F-4)T4], momentarily to start playback and confirmation.
VOICE RECORDER FUNCTIONS 7 ■ Digital voice recorder (continued) • Sending a message for transmit • Transmit monitor function q Push [EXIT/SET] several times to close a multifunction 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. The monitor function can be automatically turned ON while transmitting a voice memory message.
8 MEMORY OPERATION ■ Memory channels The transceiver has 101 memory channels. The memory mode is very useful for quickly changing to oftenused frequencies. All 101 memory channels are tuneable which means the programmed frequency can be tuned temporarily with the tuning dial, etc. in memory mode. MEMORY CHANNEL MEMORY CHANNEL NUMBER CAPABILITY TRANSFER TO VFO OVERWRITING CLEAR Regular memory channels 1–99 One frequency and one mode in each memory channel.
MEMORY OPERATION 8 ■ 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 memory channel screen. You can select a desired memory channel from the memory channel screen. • Selecting a memory channel using the memory channel screen q Push [EXIT/SET] several times to close a multifunction screen, if necessary. w Push [(F-4)MEMORY] to select the memory channel screen.
8 MEMORY OPERATION ■ Memory channel programming Memory channel programming can be preformed either in VFO mode or in memory mode. • Programming in VFO mode q Set the desired frequency and operating mode in VFO mode. Y]/[Z Z] several times to select the desired w Push [Y memory channel. • Memory channel screen is convenient for selecting the desired channel. • Memory channel contents appear in the memory channel readout (below the frequency readout). • “--.---.
MEMORY OPERATION 8 ■ Frequency transferring The frequency and operating mode in a memory channel 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]/[Z Z]. [Y • Memory channel screen is convenient for selecting the desired channel. • Memory channel contents appear in the memory channel readout (below the frequency readout). • “--.---.
8 MEMORY OPERATION ■ Memory names All memory channels (including scan edges) can be tagged with alphanumeric names of up to 10 characters each. r Push [(F-4)NAME] to edit memory channel name. • A cursor appears and blinks. • Memory channel names of blank channels cannot be edited. Capital letters, small letters, numerals, some symbols _ (! # $ % & ¥ ? " ’ ` ^ + – ✱ / . , : ; = < > ( ) [ ] { } | _ ) and spaces can be used. BW 2.4k SFT TX TX VFO • Editing (programming) memory names ANT 1 BW 2.
MEMORY OPERATION 8 ■ Memo pads The transceiver has a memo pad function to store frequency 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. (p.
9 SCANS ■ Scan types • The scan function can be used on the main readout only. • You can operate a scan while operating on a frequency using the dualwatch or split functions. See p. 63 for details. PROGRAMMED SCAN ∂F SCAN Repeatedly scans between two scan edge frequencies (scan edge memory channels P1 and P2). Repeatedly scans within ∂F span area. Scan edge P1 or P2 Scan edge P2 or P1 Start frequency –∂F frequency +∂F frequency Scan Scan Scan Jump Jump This scan operates in VFO mode.
SCANS 9 ■ Programmed scan operation q Push [EXIT/SET] several times to close a multifunction screen, if necessary. w Select VFO mode. e Select the desired operating mode. • The operating mode can also be changed while scanning. r Push [(F-5)SCAN] to select the scan screen. VOX OFF COMP OFF WIDE • Decimal points blink while scanning. ANT 1 BW 2.4k SFT TX TX METER Po VFO qw:pp 0 USB 14.100.00 1 P.AMP 1 VFO USB Span Programmed scan edges ∂F PROG : P1: P2: ± qr.wpt.pp 14.100.
9 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 multifunction screen, if necessary. w Push [(F-5)SCAN] to select the scan screen. e Set for programmed scan or ∂F scan as described on previous page. ∂F] to start a scan.
SCANS 9 ■ Select memory scan operation q Push [EXIT/SET] several times to close a multifunction screen, if necessary. w Select memory mode. e Push [(F-5)SCAN] to select the scan screen. ANT 1 BW 2.4k SFT 12 TX TX METER Po P.AMP 1 USB USB COMP OFF WIDE METER Po : Programmed scan edges ∂F MEMO P1: P2: ± USB USB FIL2 qr.wpt.pp 14.100.00 1 USB SCAN SELECT MEMORY SCAN COMP OFF WIDE 10kHz 0.500.00MHz 29.999.
9 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 multifunction screen, if necessary. w Push [(F-5)SCAN] to select the scan screen. SCAN AGC MID VOX OFF ∂F COMP OFF WIDE PROG Span Programmed scan edges : ± P1: P2: ∂F 10kHz 0.500.00MHz 29.999.
ANTENNA TUNER OPERATION 10 ■ Automatic antenna selection The transceiver covers 0.1–60 MHz over 10 bands. Each band key has a band memory which can memorize a selected antenna (ANT1, ANT2, ANT1/RX antenna and ANT2/RX antenna). When you change the operating frequency beyond a band, the previously used antenna is automatically selected for the new band. This function is convenient when you use 2 or 3 antennas.
10 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 capacitor 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. TUNER OPERATION ➥ Push the [TUNER] switch to turn the internal antenna tuner ON.
ANTENNA TUNER OPERATION 10 ■ 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) or more than 12 m/40 ft long (1.8 MHz and above). • When connecting the AH-4/AH-3, the antenna connector assignments are [ANT2] for the internal tuner and [ANT1] for the AH-4/AH-3.
11 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]. q Push [EXIT/SET] several times to close a multifunction screen, if necessary. w Push [EXIT/SET] for 1 sec. to select the set mode menu screen. e Push [(F-4)TIME] to enter the time set mode. Y] or [(F-2)Z Z] to select the desired r Push [(F-1)Y item.
CLOCK AND TIMERS 11 D Setting the current time Y] to select q Entering time set mode, push [(F-1)Y the Time (Now) item. ANT 1 BW 2.4k SFT TX TX METER Po VFO • “TIME–set Push [SET]” blinks. 12:00 FIL2 14.100.00 VFO USB VOX OFF USB COMP OFF WIDE FIL2 1 14.100.
11 CLOCK AND TIMERS D Setting power-on time The transceiver can be set to turn ON automatically at a specified time. Y] or [(F-2)Z Z] q Entering time set mode, push [(F-1)Y to select the Power-ON Time Set item.
12 SET MODE ■ Set mode description q Push [EXIT/SET] several times to close a multifunction screen, if necessary. w Push [EXIT/SET] for 1 sec. to select the set mode menu screen. e Push [(F-1)LEVEL], [(F-2)DISP], [(F-3)DSP], [(F4)TIME] or [(F-5)OTHERS] to enter the desired set mode. r For level, display or miscellaneous (others) set mode, push [(F-5)WIDE] to toggle wide and normal screen. Y] or [(F-2)Z Z] to select the desired t Push [(F-1)Y item. y Set the desired condition using the tuning dial.
12 SET MODE ■ Level set mode SSB Tx Tone (Bass) This item adjusts the bass level of the transmit audio tone in SSB mode from –5 dB to +5 dB in 1 dB steps. 0dB 0 dB (default) SSB Tx Tone (Treble) This item adjusts the treble level of the transmit audio tone in SSB mode from –5 dB to +5 dB in 1 dB steps. 0dB 0 dB (default) SSB TBW (WIDE) L These items set the transmission passband width for wide setting by selecting the lower and higher frequencies. Lower freq.
SET MODE 12 ■ Level set mode (continued) SSB TBW (NAR) H 2500 These items set the transmission passband width for narrow setting by selecting the lower and higher frequencies. Lower freq. : 2500 (default), 2700 and 2900 Hz 2500 Hz (default) Monitor Level This item adjusts the transmit IF signal monitor level from 0% to 100% in 1% steps. 50% 50% (default) See p. 70 for details. Side Tone Level This item adjusts the CW side tone level from 0% to 100% in 1% steps. 50% 50% (default) See p.
12 SET MODE ■ Display set mode To adjust the LCD contrast or backlight, wait until the LCD becomes stable (10 min. or more after turning power ON). This is an inherent characteristic of LCDs and LCD backlights and does not indicate a transceiver malfunction. Contrast (LCD) 60% This item adjusts the contrast of the LCD from 0% to 100% in 1% steps. 60% (default) Backlight (LCD) 50% This item adjusts the brightness of the LCD from 0% to 100% in 1% steps.
SET MODE 12 ■ Display set mode (continued) Screen Saver Function This item sets the screen saver setting from 60 min, 30 min, 15 min and OFF. 60 min Screen saver function activates after 60 minute of inactivity. (default) 30 min Screen saver function activates after 30 minute of inactivity. 15 min Screen saver function activates after 15 minute of inactivity. OFF Screen saver function is OFF. My Call Your call sign, etc. can be displayed in the opening screen when turning power ON.
12 SET MODE ■ DSP filter set mode To suit your operating style, the type of DSP filter shape for SSB and CW can be selected. AGC MID DSP FILTER SET SSB SHARP CW SHARP BK-IN OFF 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. e Push the [(F-3)DSP] switch to enter the DSP filter set mode.
SET MODE 12 ■ Miscellaneous (others) set mode (continued) Quick Dualwatch When this item is set to ON, pushing [DUALWATCH] for 1 sec. sets the sub readout frequency to the main readout frequency and activates dualwatch operation. ON OFF Quick dualwatch ON (default) Quick dualwatch OFF ON OFF Quick split ON (default) Quick split OFF See p. 63 for details. Quick SPLIT When this item is set to ON, pushing [SPLIT] for 1 sec.
12 SET MODE ■ Miscellaneous (others) set mode (continued) Tuner (Auto Start) The internal antenna tuner has an automatic start capability which starts tuning if the SWR is higher than 1.5–3:1. ON OFF Automatic tuner start ON Automatic tuner start OFF (default) ON OFF Automatic PTT start ON Automatic PTT start OFF (default) When “OFF” is selected, the tuner remains OFF even when the SWR is poor (1.5–3:1). When “ON” is selected, automatic tune starts even when the tuner is turned OFF.
SET MODE 12 ■ Miscellaneous (others) set mode (continued) SPEECH Language When the optional UT-102 VOICE SYNTHESIZER UNIT is installed, you can select between English and Japanese as the language. English Japanese English announcement (default) Japanese announcement HIGH LOW Faster announcement (default) Slower announcement ON OFF Signal level announcement (default) No signal level announcement See p. 105 for unit installation.
12 SET MODE ■ Miscellaneous (others) set mode (continued) MAIN DIAL Auto TS This item sets the auto tuning step function. When rotating the tuning dial rapidly, the tuning step automatically changes several times as selected. There are 2 type of auto tuning steps: HIGH (Fastest) and LOW (Faster). HIGH Auto tuning step is turned ON. Fastest tuning step during rapid rotation (default) LOW Auto tuning step is turned ON. Faster tuning step during rapid rotation OFF Auto tuning step is turned OFF.
SET MODE 12 ■ Miscellaneous (others) set mode (continued) External Keypad This item sets the external keypad capability and function. For your information The following diagram shows the equivalent circuit of an external keypad and connects to the pin 3 and pin 7 of the [MIC] connector (p. 18). 4.7kΩ ±5% S4 (T4/M4) 2.2kΩ ±5% S3 (T3/M3) 1.5kΩ ±5% 1.
13 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. CAUTION: DISCONNECT the DC power cable from the transceiver before performing any work on the transceiver. Otherwise, there is danger of electric shock and/or equipment damage. q Remove 2 screws from the left side of the transceiver to remove the carrying handle as shown below.
INTERNAL VIEWS 14 • Top view PA unit PA fuse (FGB 5 A) Internal antenna tuner FILTER unit • Bottom view 13 14 RF unit BPF unit Clock backup battery PRE AMP unit PLL unit SPCH Optional voice synthesizer level adj.
15 MAINTENANCE ■ Troubleshooting The following chart is designed to help you correct problems which are not equipment malfunctions. POWER PROBLEM If you are unable to locate the cause of a problem or solve it through the use of this chart, contact your nearest Icom Dealer or Service Center. POSSIBLE CAUSE RECEIVE REF. Power does not come on • Power cable is improperly connected. when the [POWER] switch • Fuse is blown. is pushed. • Re-connect the DC power cable correctly. p.
MAINTENANCE DISPLAY PROBLEM POSSIBLE CAUSE SOLUTION The displayed frequency • The dial lock function is activated. does not change properly. • A set mode screen is selected. REF. • Push [LOCK/SPEECH] to turn the function OFF. p. 65 • Push [EXIT/SET] several times to exit the set pgs. 10, mode screen. 94 • Reset the CPU. p. 21 • The internal CPU has malfunctioned.
15 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 counterclockwise to obtain a comfortable tension level while turning the dial continuously and evenly in one direction.
CONTROL COMMAND 16 ■ Remote jack (CI-V) information • CI-V connection example The transceiver can be connected through an optional CT-17 CI-V LEVEL CONVERTER to a personal computer equipped with an RS-232C port. The Icom Communications Interface-V (CI-V) controls the following functions of the transceiver. IC-756PROIII 9–15 V DC 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 condition using set mode.
16 CONTROL COMMAND • Command table Command Sub command 00 — 01 Same as command 06 02 — Read band edge frequencies 03 — Read operating frequency 04 — Read operating mode 05 — Set frequency data 06 00 01 02 03 04 05 07 08 Select LSB Select USB Select AM Select CW Select RTTY Select FM Select CW-R Select RTTY-R 07 — B0 B1 C0 C1 D0 D1 Select VFO mode Exchange main and sub readouts Equalize main and sub readouts Turn the dualwatch OFF Turn the dualwatch ON Select main readout Select sub
CONTROL COMMAND 16 • Command table (continued) Command Sub command Description Command Sub command Description 16 22 40 41 42 43 44 45 46 47 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 breakin; 2=full break-in) Manual notch (0=OFF; 1=ON) RTTY filter (0=OFF; 1=ON) Twin peak filter (0=OFF; 1=ON) Dial loc
16 CONTROL COMMAND • Command table (continued) Command Sub command Description Command Sub command Description 1A 0544 Send/read TX spectrum scope set (0=OFF, 1=ON) Send/read spectrum scope max.
CONTROL COMMAND 16 • To send/read memory contents • Channel code for memory keyer 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) To send or read the desired memory keyer contents, the channel and character codes as follows are used.
17 SPECIFICATIONS • General • Receiver • Frequency coverage : (unit: MHz) Receiver 0.030–60.000*1*2 Transmitter 1.800–1.999*2, 3.500–3.999*2, 5.33050*3, 5.34650*3, 5.36650*3, 5.37150*3, 5.40350*3, 7.000–7.300*2, 10.100–10.150*2, 14.000–14.350*2, 18.068–18.168*2, 21.000–21.450*2, 24.890–24.990*2, 28.000–29.700*2, 50.000–54.000*2 • Receive system *1Some frequency bands are not guaranteed. *2Depending on version. *3USA version only. • Mode : USB, LSB, CW, RTTY, AM, FM • No.
OPTIONS 18 IC-PW1/EURO HF/50 MHz ALL BAND 1 kW LINEAR AMPLIFIER PS-125 DC POWER SUPPLY Full-duty 1 kW linear amplifier including an automatic antenna tuner. Has automatic tuning and band selection capability. Full break-in (QSK) operation is possible. The amplifier/power supply unit and the remote control unit are separated. Light weight switching regulator system power supply. AH-4 HF/50 MHz AUTOMATIC ANTENNA TUNER SM-20 DESKTOP MICROPHONE AH-2b ANTENNA ELEMENT • Output voltage: 13.8 V DC • Max.
19 ABOUT CE INSTALLATION NOTES For amateur base station installations it is recommended that the forwards clearance in front of the antenna array is calculated relative to the EIRP (Effective Isotropic Radiated Power). The clearance height below the antenna array can be determined in most cases from the RF power at the antenna input terminals. EIRP clearance heights by frequency band 1 Watts 2.1 m 10 Watts 2.8 m 25 Watts 3.
ABOUT CE 19 DECLARATION OF CONFORMITY 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. Kind of equipment: HF/50 MHz ALL MODE TRANSCEIVER Type-designation: Düsseldorf 1st Sep.
IC-756PROIII #33 (Europe) IC-756PROIII #34 (France) IC-756PROIII #35 (UK) IC-756PROIII #38 (Italy) IC-756PROIII #40 (Spain) A-6378H-1EX Printed in Japan © 2004 Icom Inc.
