IC-756PROII.qxd 02.1.8 15:51 Page a INSTRUCTION MANUAL HF/50 MHz ALL MODE TRANSCEIVER i756PRO™ This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
IC-756PROII.qxd 02.1.8 15:51 Page b IMPORTANT READ THIS INSTRUCTION MANUAL CAREFULLY before attempting to operate the transceiver. EXPLICIT DEFINITIONS 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-756PROII. NOTE Equipment damage may occur. If disregarded, inconvenience only. No risk or personal injury, fire or electric shock.
IC-756PROII.qxd 02.1.8 15:51 Page 1 1 TABLE OF CONTENTS IMPORTANT ........................................ i EXPLICIT DEFINITIONS ..................... i PRECAUTIONS ................................... i 1 TABLE OF CONTENTS ................ 1 2 PANEL DESCRIPTION ........... 2 – 13 ■ Front panel ..................................... 2 ■ Microphone (HM-36) ...................... 9 ■ LCD display .................................. 10 ■ Screen menu arrangement ........... 11 ■ Rear panel ....................
IC-756PROII.qxd 2 02.1.8 15:51 Page 2 PANEL DESCRIPTION ■ Front panel !6 !5 !2 HF/50MHz TRANSCEIVER TIMER q !4 !3 POWER TRANSMIT w i756PRO™ 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 i o !0 !1 q POWER SWITCH [POWER/TIMER] ➥ Push momentarily to turn power ON. (dot) (com) (dash) • Turn the optional DC power supply ON in advance.
IC-756PROII.qxd 02.1.8 15:51 Page 3 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.
IC-756PROII.qxd 02.1.8 15:51 2 Page 4 PANEL DESCRIPTION ■ Front panel (continued) @9 @8 @7 @6 TWIN PBT EIVER SPLIT 1.8 1 3.
IC-756PROII.qxd 02.1.8 15:51 Page 5 PANEL DESCRIPTION ➥ Transfers the memory contents to VFO when pushed for 1 sec. (p. 54) @8 MAIN/SUB CHANGE SWITCH [CHANGE] ➥ Switches the frequency and selected memory channel between main and sub readouts when pushed. • Switches between transmit frequency and receive frequency when the split frequency function is ON. (p. 32) ➥ Equalizes the sub readout frequency to the main readout frequency when pushed for 1 sec.
IC-756PROII.qxd 2 02.1.8 15:51 Page 6 PANEL DESCRIPTION ■ Front panel (continued) $7 $6 $5 $4 $3 $0 $1 $2 #9 TWIN PBT CEIVER SPLIT 1.8 1 3.
IC-756PROII.qxd 02.1.8 15:51 Page 7 PANEL DESCRIPTION #7 PBT CLEAR SWITCH [PBT CLR] (p. 25) Clears the PBT settings when pushed for 1 sec. • The [PBT CLR] indicator lights when PBT is in use. #8 NOTCH SWITCH [NOTCH] (p. 26) ➥ Switches the notch function between auto, manual and OFF in SSB and AM modes. ➥ Turns the manual notch function ON and OFF when pushed in CW mode. ➥ Turns the auto notch function ON and OFF when pushed in FM mode. • “AN” appears when auto notch is in use.
IC-756PROII.qxd 2 02.1.8 15:51 Page 8 PANEL DESCRIPTION ■ Front panel (continued) $9 %0 %1 %2 %3 $8 TWIN PBT EIVER SPLIT 1.8 1 3.
IC-756PROII.qxd 02.1.8 15:51 Page 9 PANEL DESCRIPTION 2 ■ Microphone (HM-36) q w q UP/DOWN SWITCHES [UP]/[DN] Change the selected readout frequency or memory channel. w PTT SWITCH Push and hold to transmit; release to receive. • Continuous pushing changes the frequency or memory channel number continuously. • While pushing [XFC], the transmit readout frequency can be controlled while in spilt frequency operation. • The [UP]/[DN] switch can simulate a key paddle. Preset in the keyer set mode. (p.
IC-756PROII.qxd 2 02.1.8 15:51 Page 10 PANEL DESCRIPTION ■ LCD display !6 q w e w ANT 1 METER Po BW 2.4k SFT TX VFO 1ß VOX OFF COMP OFF WIDE SPAN o qw:pp 0 USB FIL2 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 !0 qr.qqy.pp P.AMP 1 AGC MID !5 !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 transmit. w VFO/MEMORY CHANNEL INDICATOR (pgs.
IC-756PROII.qxd 02.1.8 15:51 Page 11 PANEL DESCRIPTION 2 ■ Screen menu arrangement The following screens can be selected from the start up screen. Choose the desired screen using the following chart. Pushing [EXIT/SET] several times returns to the start up screen. See p. 64 for set mode arrangement. • Start up screen ANT 1 METER Po P.AMP 1 BW 2.4k SFT T X VFO qw:pp 0 CW FIL2 qr.qpp.pp CW --. ---. -- 1 VFO USB FIL2 qr.qpp.pp ATT 0FF 1 CW --. ---. -- • Spectrum scope screen (p.
IC-756PROII.qxd 2 02.1.8 15:51 Page 12 PANEL DESCRIPTION ■ Rear panel !4 !3 !2 qw !1 e q TRANSVERTER JACK [XVERT] (p. 19) External transverter input/output jack. Activated by voltage applied to [ACC(2)] pin 6. w RECEIVE ANTENNA CONNECTOR [RX ANT] (p. 16) Connects a 50 Ω general coverage antenna with an RCA connector. e TUNER CONTROL SOCKET [TUNER] (p. 16) Accepts the control cable from an optional AH-4 HF/50 MHz AUTOMATIC ANTENNA TUNER or AH-3 HF AUTOMATIC ANTENNA TUNER.
IC-756PROII.qxd 02.1.8 15:51 Page 13 PANEL DESCRIPTION !2 ANTENNA CONNECTOR 1 [ANT1] !3 ANTENNA CONNECTOR 2 [ANT2] (pgs. 14, 15) Accept a 50 Ω antenna with a PL-259 connector. 2 !4 GROUND TERMINAL [GND] (pgs. 14, 15) Connect this terminal to a ground to prevent electrical shocks, TVI, BCI and other problems. 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.
IC-756PROII.qxd 3 02.1.8 15:51 Page 14 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.
IC-756PROII.qxd 02.1.8 15:51 Page 15 3 INSTALLATION AND CONNECTIONS ■ Required connections • Front panel CW KEY TIMER TWIN PBT HF/50MHz TRANSCEIVER POWER 1 0 S 5 9 10 25 50 Po 1 1.5 SWR 0 COMP ALC TRANSMIT + 20 + 40 SPLIT 1.8 1 DUAL WATCH 10 4 21 7 3 3.
IC-756PROII.qxd 3 02.1.8 15:51 Page 16 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 + 20 + 40 SPLIT 1.8 1 DUAL WATCH 10 4 21 7 7 3 18 6 3.
IC-756PROII.qxd 02.1.8 15:51 Page 17 INSTALLATION AND CONNECTIONS ■ Power supply connections 3 CAUTION: Before connecting the DC power cable, check the following important items. Make sure: • The [POWER] switch is OFF. • Output voltage of the power source is 12–15 V when you use a non-Icom power supply. • DC power cable polarity is correct. 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.
IC-756PROII.qxd 3 02.1.8 15:51 Page 18 INSTALLATION AND CONNECTIONS ■ Linear amplifier connections Use the [ANT1] connector when connecting a linear amplifier. CONNECTING THE IC-PW1 Remote control cable (supplied with the IC-PW1) To an antenna ACC-1 ACC cable (supplied with the IC-PW1) Be sure to connect the cable to the 7-pin ACC(2) jack.
IC-756PROII.qxd 02.1.8 15:51 Page 19 INSTALLATION AND CONNECTIONS 3 ■ External antenna tuner connection CONNECTING THE AH-4/AH-3 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.
IC-756PROII.qxd 3 02.1.8 15:51 Page 20 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.
IC-756PROII.qxd 02.1.8 15:51 Page 21 FREQUENCY SETTING 4 ■ When first applying power (CPU resetting) Before first applying power, make sure all connections required for your system are complete by referring to Chapter 3. Then, reset the transceiver using the following procedure. [F-INP] [M-CL] [POWER] 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.
IC-756PROII.qxd 4 02.1.8 15:51 Page 22 FREQUENCY SETTING ■ VFO description VFO is an abbreviation of Variable Frequency Oscillator, and traditionally refers to an oscillator. The transceiver’s VFO is somewhat different. The VFO of the IC-756PROII acts like a computer’s window and can show one frequency and one operating mode. You can call up a desired frequency to the VFO with the keypad, memo pad-read switch (see p. 56) or the memory transfer function (see p. 54).
IC-756PROII.qxd 02.1.8 15:51 Page 23 4 FREQUENCY SETTING ■ Frequency setting with the tuning dial • For ham band use • For general coverage receiver use q Push the desired band key on the keypad 1–3 times. q Push [GENE] on the keypad 1–3 times. • 3 different frequencies can be selected on each band with the band key. (See “Triple band stacking register” below.) ANT 1 METER Po BW 2.4k SFT T X VFO qw:pp 0 USB BW 2.4k SFT T X VFO qw:pp 0 USB FIL2 qt.qpp.pp METER Po 21.076.50 1 FIL2 21.
IC-756PROII.qxd 4 02.1.8 15:51 Page 24 FREQUENCY SETTING ■ Advanced tuning functions QUICK TUNING STEP The operating frequency can be changed in kHz steps (0.1, 1, 5, 9, 10, 12.5, 20 or 25 kHz selectable) for quick tuning. q Push [TS] momentarily to display the quick tuning indicator. SELECTING THE kHz STEP q Push [TS] momentarily to turn the quick tuning step ON. w Push [TS] for 1 sec. to enter the quick tuning step setting display. • Selected tuning steps for all modes appear. ANT 1 METER Po BW 2.
IC-756PROII.qxd 02.1.8 15:51 Page 25 5 RECEIVE AND TRANSMIT ■ Mode selection The following modes are available in the IC756PROII: SSB (LSB/USB), CW, CW-R (CW reverse), RTTY, RTTY-R (RTTY reverse), AM and FM. Data modes of SSB, AM and FM are also available. See the diagram below for the order of selection. SSB USB-D USB CW-R CW LSB LSB-D RTTY RTTY-R FM FM-D CW/RTTY Microphone signals are muted when data mode is selected.
IC-756PROII.qxd 5 02.1.8 15:51 Page 26 RECEIVE AND TRANSMIT ■ Notch function This transceiver has auto and manual notch functions. The auto notch function automatically attenuates more than 3 beat tones, tuning signals, etc., even if they are moving. The manual notch can be set to attenuate a frequency via the [NOTCH] control. While operating the manual notch, noise may be heard. This comes from the DSP unit and does not indicate an equipment malfunction.
IC-756PROII.qxd 02.1.8 15:51 Page 27 RECEIVE AND TRANSMIT 5 ■ Noise blanker The noise blanker eliminates pulse-type noise such as from car ignitions. The noise blanker is not available for FM mode. [NB] switch Tuning dial q Push the [NB] switch to turn the noise blanker ON. • [NB] indicator lights. w Push the [NB] switch 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.
IC-756PROII.qxd 5 02.1.8 15:51 Page 28 RECEIVE AND TRANSMIT ■ RTTY filter/Twin peak filter The transceiver has 5 RTTY filters in addition to normal IF filters. The passband width can be selected from 1 kHz, 500 Hz, 350 Hz, 300 Hz and 250 Hz. When the RTTY filter is turned ON, the RTTY tuning meter can be used. (p. 42) y Push [(F-2)Z] to select twin peak filter item. • The received audio volume may become greater when the twin peak filter is turned ON.
IC-756PROII.qxd 02.1.8 15:51 Page 29 RECEIVE AND TRANSMIT 5 ■ CW pitch control The received CW audio pitch and monitored CW audio can be adjusted to suit your preferences (300 to 900 Hz) without changing the operating frequency. The filter set mode screen graphically displays the CW pitch operations. (See below.) The received CW audio pitch can be adjusted in 25 Hz steps. ■ IF filter selection The transceiver has 3 passband width IF filters for each mode.
IC-756PROII.qxd 5 02.1.8 15:51 Page 30 RECEIVE AND TRANSMIT ■ 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 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. • Setting the AGC time constant q Select the desired mode except FM mode.
IC-756PROII.qxd 02.1.8 15:51 Page 31 RECEIVE AND TRANSMIT 5 ■ 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. • Equalized receive frequency and “ DUAL-W ” appear in the LCD. This quick dualwatch function can be turned OFF in set mode. (p.
IC-756PROII.qxd 5 02.1.8 15:51 Page 32 RECEIVE AND 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. q Set 21.290 MHz (USB) in VFO mode. ANT 1 BW 2.4k SFT TX TX VFO qw:pp 0 USB FIL2 wq.wop.
IC-756PROII.qxd 02.1.8 15:51 Page 33 RECEIVE AND TRANSMIT 5 ■ Quick split function When you find a DX station, an important consideration is how to set the split frequency. 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. w Push [SPLIT] for 1 sec. • Split frequency operation is turned ON.
IC-756PROII.qxd 02.1.8 15:51 5 Page 34 RECEIVE AND TRANSMIT ■ RIT and ∂TX • RIT function • ∂TX function The RIT 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. 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 #2 on p. 6 for function description. • See #3 on p.
IC-756PROII.qxd 02.1.8 15:51 Page 35 RECEIVE AND TRANSMIT 5 ■ 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. 65) The CW sidetone functions regardless of the [MONITOR] switch setting. [MONITOR] switch [PHONES] jack q Push [MONITOR]. • The indicator lights when the monitor function is ON.
IC-756PROII.qxd 5 02.1.8 15:51 Page 36 RECEIVE AND TRANSMIT ■ 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.
IC-756PROII.qxd 02.1.8 15:51 Page 37 RECEIVE AND TRANSMIT 5 ■ Speech compressor The RF speech compressor increases average RF output power, improving signal strength and readability in SSB. y Push [METER] once to select the COMP meter. u Adjust the [COMP] control so that the COMP meter reads within 10 dB and 20 dB. COMP meter • Speech compressor q Select USB or LSB mode. w Push [COMP] momentarily to turn the speech compressor ON and OFF. e Push [COMP] for 1 sec.
IC-756PROII.qxd 5 02.1.8 15:51 Page 38 RECEIVE AND TRANSMIT ■ 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.
IC-756PROII.qxd 02.1.8 15:51 Page 39 RECEIVE AND TRANSMIT 5 ■ Digital voice recorder (continued) • One-touch voice recording [REC/PLAY] switch 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. • Recording is automatically terminated after 30 min.
IC-756PROII.qxd 5 02.1.8 15:51 Page 40 RECEIVE AND TRANSMIT ■ 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.
IC-756PROII.qxd 02.1.8 15:51 Page 41 RECEIVE AND TRANSMIT 5 ■ 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.
IC-756PROII.qxd 5 02.1.8 15:51 Page 42 RECEIVE AND TRANSMIT ■ RTTY decoder 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. • RTTY decoder screen appears.
IC-756PROII.qxd 02.1.8 15:51 Page 43 RECEIVE AND TRANSMIT 5 ■ Electronic CW keyer The transceiver has an electronic keyer. Keying speed can be adjusted with [KEY SPEED]. Keying weight, the ratio of dot : space : dash, can be set from 1 : 1 : 2.8 to 1 : 1 : 4.5 in keyer set mode. o Push [(F-2)√] to select the “Rise Time” item. KEYER CW-KEY AGC MID BK-IN OFF 1/4 OFF • Setting the electronic keyer q Push [EXIT/SET] several times, if necessary. w Push [CW/RTTY] to select CW mode.
IC-756PROII.qxd 5 02.1.8 15:51 Page 44 RECEIVE AND TRANSMIT ■ Memory keyer The memory keyer memorizes and can re-transmit 4 CW key codes for often-used CW sentences, antenna types, etc. Total capacity of the memory keyer is 55 characters in each memory channel. • Programming the memory 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-2)EDIT] to enter the keyer edit screen.
IC-756PROII.qxd 02.1.8 15:51 Page 45 RECEIVE AND TRANSMIT 5 ■ 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. q Push [EXIT/SET] several times to close a multifunction screen, if necessary. w Push [(F-1)SCOPE] to select the scope screen. ANT 1 BW 2.4k SFT TX TX VFO qw:pp 0 USB FIL2 qr.qot.pp METER Po 14.100.
IC-756PROII.qxd 5 02.1.8 15:51 Page 46 RECEIVE AND TRANSMIT ■ 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.
IC-756PROII.qxd 02.1.8 15:51 Page 47 RECEIVE AND TRANSMIT 5 ■ 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.
IC-756PROII.qxd 5 02.1.8 15:51 Page 48 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 Push [VFO/MEMO] to select VFO mode. ANT 1 BW 2.4k SFT TX TX VFO qw:pp 0 USB FIL2 wq.wop.pp METER Po 14.100.00 1 P.AMP 1 VFO USB USB 14.100.00 1 15k SFT BW TX TX P.AMP 1 ATT OFF VFO VOX OFF USB qw:pp 0 FM FIL2 TSQL wo.yip.pp 14.
IC-756PROII.qxd 02.1.8 15:51 Page 49 RECEIVE AND TRANSMIT 5 ■ 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.
IC-756PROII.qxd 5 02.1.8 15:51 Page 50 RECEIVE AND TRANSMIT ■ Optional external tuner operation • AH-4/AH-3 HF AUTOMATIC ANTENNA TUNER The AH-4 matches the IC-756PROII to a long wire antenna more than 7 m/23 ft long (3.5 MHz and above). The AH-3 matches the IC-756PROII 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).
IC-756PROII.qxd 02.1.8 15:51 Page 51 6 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.
IC-756PROII.qxd 6 02.1.8 15:51 Page 52 MEMORY OPERATION ■ 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.
IC-756PROII.qxd 02.1.8 15:51 Page 53 MEMORY OPERATION 6 ■ 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. w Push [Y]/[Z] several times to select the desired 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). • “--.---.
IC-756PROII.qxd 6 02.1.8 15:51 Page 54 MEMORY OPERATION ■ 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]. • Memory channel screen is convenient for selecting the desired channel.
IC-756PROII.qxd 02.1.8 15:51 Page 55 MEMORY OPERATION 6 ■ 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.
IC-756PROII.qxd 6 02.1.8 15:51 Page 56 MEMORY OPERATION ■ 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.
IC-756PROII.qxd 02.1.8 15:51 Page 57 7 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. 31 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.
IC-756PROII.qxd 7 02.1.8 15:51 Page 58 SCANS ■ 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 FIL2 qr.qot.pp 14.100.00 1 P.AMP 1 VFO USB FIL2 14.100.
IC-756PROII.qxd 02.1.8 15:51 Page 59 SCANS 7 ■ 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.
IC-756PROII.qxd 7 02.1.8 15:51 Page 60 SCANS ■ 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 USB VFO USB VOX OFF COMP OFF WIDE Span : Programmed scan edges ∂F MEMO P1: P2: ± COMP OFF WIDE 10kHz 0.500.00MHz 29.999.99MHz 14.100.
IC-756PROII.qxd 02.1.8 15:51 Page 61 SCANS 7 ■ 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.
IC-756PROII.qxd 02.1.8 15:51 8 Page 62 CLOCK AND TIMERS ■ Setting the current time 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]. q Push [EXIT/SET] several times to close a multifunction screen, if necessary. w Push [EXIT/SET] for 1 sec. then [(F-4)TIME] to enter timer set mode. e Push [(F-1)Y] to select the Time (Now) item.
IC-756PROII.qxd 02.1.8 15:51 Page 63 CLOCK AND TIMERS 8 ■ Setting power-on time The transceiver can be set to turn ON automatically at a specified time. q Push [EXIT/SET] several times to close a multifunction screen, if necessary. w Push [EXIT/SET] for 1 sec. then [(F-4)TIME] to enter timer set mode. e Push [(F-1)Y] or [(F-2)Z] to select the Power-ON Timer Set item. r Set the desired power-on time using the tuning dial. • “TIMER–set Push [SET]” blinks.
IC-756PROII.qxd 02.1.8 15:51 9 Page 64 SET MODE ■ Set mode description t Push [(F-1)Y] or [(F-2)Z] to select the desired item. y Set the desired condition using the tuning dial. Set mode is used for programming infrequently changed values or conditions of functions. This transceiver has a level set mode, display set mode, timer set mode and miscellaneous (others) set mode. • Push [(F-3)DEF] for 1 sec. to select a default condition or value.
IC-756PROII.qxd 02.1.8 15:51 Page 65 SET MODE 9 ■ 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) Monitor Level This item adjusts the transmit IF signal monitor level from 0% to 100% in 1% steps. 50% 50% (default) See p. 35 for details.
IC-756PROII.qxd 9 02.1.8 15:52 Page 66 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.
IC-756PROII.qxd 02.1.8 15:52 Page 67 SET MODE 9 ■ Display set mode (continued) My Call Your call sign, etc. can be displayed in the opening screen when turning power ON. Up to 10 characters can be programmed. Capital letters, numerals, some symbols (– / . ) and spaces can be used. q Push [EXIT/SET] several times to close a multifunction screen, if necessary. w Push [EXIT/SET] for 1 sec. then [(F-2)DISP] momentarily to select the display set mode screen.
IC-756PROII.qxd 9 02.1.8 15:52 Page 68 SET MODE ■ Timer set mode Time (Now) 15:00 This item sets the current time for the built-in 24-hour clock. Push [(F-4)SET] to enter the time. See p. 62 for details. Timer Function This item sets the timer functions ON and OFF. When the power-ON timer or the power-OFF timer is used, “ON” must be selected in this item. ON OFF The timer functions can be The timer functions cannot operated. (default) be operated. See p. 62 for details.
IC-756PROII.qxd 02.1.8 15:52 Page 69 SET MODE 9 ■ Miscellaneous (others) set mode (continued) RF/SQL Control The [RF/SQL] control can be set as the RF/squelch control (default), the squelch control only (RF gain is fixed at maximum) or ‘Auto’ (RF gain control in SSB, CW and RTTY; squelch control in AM and FM).
IC-756PROII.qxd 9 02.1.8 15:52 Page 70 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) 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.
IC-756PROII.qxd 02.1.8 15:52 Page 71 SET MODE 9 ■ Miscellaneous (others) set mode (continued) RTTY Decode USOS This item selects the USOS (UnShift On Space) function of the internal RTTY decoder. ON OFF Decode as letter code (default) Decode as character code RTTY Decode New Line Code This item selects the new line code of the internal RTTY decoder.
IC-756PROII.qxd 9 02.1.8 15:52 Page 72 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.
IC-756PROII.qxd 02.1.8 15:52 Page 73 SET MODE 9 ■ 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 7of the [MIC] connector (p. 9). 4.7kΩ ±5% S4 (T4/M4) 2.2kΩ ±5% S3 (T3/M3) 1.5kΩ ±5% 1.
IC-756PROII.qxd 02.1.8 15:52 10 Page 74 OPTION INSTALLATION ■ Opening the transceiver’s case 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.
IC-756PROII.qxd 02.1.8 15:52 Page 75 MAINTENANCE 11 ■ 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 No sounds come out from • Volume level is too low. the speaker. • The squelch is closed. • Rotate [AF] clockwise to obtain a suitable lis- p. 2 tening level.
IC-756PROII.qxd 11 02.1.8 15:52 Page 76 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. • Push [LOCK/SPEECH] to turn the function OFF. p. 46 • Push [EXIT/SET] several times to exit the set pgs. 11, mode screen. 64 • Reset the CPU. p. 21 • The internal CPU has malfunctioned. ■ Fuse replacement REF.
IC-756PROII.qxd 02.1.8 15:52 Page 77 MAINTENANCE 11 ■ 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.
IC-756PROII.qxd 02.1.8 15:52 12 Page 78 INTERNAL VIEWS • Top view PA unit PA fuse (FGB 5 A) Internal antenna tuner FILTER unit • Bottom view RF unit Clock backup battery SPCH Optional voice synthesizer level adj.
IC-756PROII.qxd 02.1.8 15:52 Page 79 13 CONTROL COMMAND ■ 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-756PROII 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.
IC-756PROII.qxd 13 02.1.
IC-756PROII.qxd 02.1.8 15:52 Page 81 CONTROL COMMAND 13 • Command table (continued) Command 1A Sub command Description 0518 Send/read power-OFF period (5=5 min. to 120=120 min. in 5 min. step) Send/read calibration marker (0=OFF, 1=ON) Send/read confirmation beep (0=OFF, 1=ON) Send/read band edge beep (0=OFF, 1=ON) Send/read RF/SQL control set (0=Auto, 1=SQL, 2=RF+SQL) Send/read quick dualwatch set (0=OFF, 1=ON) Send/read quick split set (0=OFF, 1=ON) Send/read FM split offset (HF) –4.000 to +4.
IC-756PROII.qxd 13 02.1.8 15:52 Page 82 CONTROL COMMAND • 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 contents, combined code of the frequency band and register codes as follows are used.
IC-756PROII.qxd 02.1.8 15:52 Page 83 SPECIFICATIONS • General • Frequency coverage Rx Tx • Receiver : • Receive system 0.030–60.000 MHz*1*2 1.800– 1.999 MHz*2 3.500– 3.999 MHz*2 7.000– 7.300 MHz*2 10.100–10.150 MHz*2 14.000–14.350 MHz*2 18.068–18.168 MHz*2 21.000–21.450 MHz*2 24.890–24.990 MHz*2 28.000–29.700 MHz*2 50.000–54.000 MHz*2 *1Some frequency bands are not guaranteed. *2Depending on version. • Mode : USB, LSB, CW, RTTY, AM, FM • No.
IC-756PROII.qxd 02.1.8 15:52 15 Page 84 OPTIONS IC-PW1 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.
IC-756PROII.qxd 02.1.8 15:52 Page 85 ABOUT CE 16 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.
IC-756PROII.qxd 02.1.8 15:52 Page Z IC-756PROII #23 (Europe) ■ GER ■ NED ■ ITA ■ AUT ■ BEL ■ GRE ■ GBR ■ LUX ■ SWE ■ IRL ■ ESP ■ DEN ■ FRA ■ POR ■ FIN ■ SUI IC-756PROII #24 (France) ■ GER ■ NED ■ ITA ■ AUT ■ BEL ■ GRE ■ GBR ■ LUX ■ SWE ■ IRL ■ ESP ■ DEN ■ FRA ■ POR ■ FIN ■ SUI IC-756PROII #25 (Denmark) IC-756PROII #28 (Italy) IC-756PROII #30 (Spain) A-6072H-1EX-w Printed in Japan © 2001 Icom Inc.
