Icom IC-756PROII manual

INSTRUCTION MANUAL HF/50 MHz ALL MODE TRANSCEIVER i756PRO™ This device complies with Part 15 of the FCC rules. Operation is sub- ject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.[...]

i IMPOR T ANT READ THIS INSTRUCTION MANUAL CAREFULL Y before attempting to operate the transceiver . SA VE THIS INSTRUCTION MANUAL. This manual contains important safety and operating in- structions for the IC-756PROII. EXPLICIT DEFINITIONS R W ARNING HIGH VOL T AGE! NEVER at- tach an antenna or internal antenna connector during transmission. This [...]

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

■ Front panel q POWER SWITCH [POWER/TIMER] ➥ Push momentarily to turn power ON. • Turn the optional DC power supply ON in advance. • A/D converter calibration of the DSP unit starts and it takes approx. 10 sec. ➥ Push momentarily to toggle the timer function ON and OFF . (p. 63) • The power switch lights while the timer function is ON. [...]

2 3 P ANEL 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 re- ceived. • The squelch is particularly effective for FM. It is also available for other modes. • 12 to 1 o ’ clock position[...]

4 2 P ANEL DESCRIPTION ■ Front panel (continued) !7 COMPRESSION LEVEL CONTROL [COMP] (p. 37) Adjusts the speech compression level in SSB. !8 SEMI BREAK-IN DELA Y CONTROL [BK-IN DELA Y] Adjusts the transmit-to-receive switching delay time for CW semi break-in operation. !9 ELECTRONIC CW KEYER SPEED CONTROL [KEY SPEED] (p. 43) Adjusts the internal [...]

5 2 P ANEL DESCRIPTION ➥ T ransfers 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 fre- quency when the split frequency function is ON. (p. 32) ➥ Equa[...]

■ Front panel (continued) #0 LOCK/SPEECH SWITCH [LOCK/SPEECH] ➥ Push momentarily to toggle the dial lock function ON and OFF . (p. 46) ➥ Pushing for 1 sec. announces the S-meter indi- cation and the selected readout frequency when an optional UT -102 is installed. (p. 74) #1 RIT/ ∂ ∂ TX CONTROL [RIT/ ∂ ∂ TX] (p. 34) Shifts the receive[...]

7 2 P ANEL 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, man- ual and OFF in SSB and AM modes. ➥ T urns the manual notch function ON and OFF when pushed in CW mode.[...]

8 2 P ANEL DESCRIPTION ■ Front panel (continued) $8 LCD FUNCTION DISPLA Y (See p. 10 for details.) Shows the operating frequency , function switch menus, spectrum screen, memory channel screen, set mode settings, etc. $9 MEMOR Y UP/DOWN SWITCHES [ Y Y ]/[ Z Z ] (p. 51) ➥ Select the memory channel number for the se- lected readout. • Memory ch[...]

9 2 P ANEL DESCRIPTION • MICROPHONE CONNECTOR (Front panel view) • HM-36 SCHEMA TIC DIAGRAM CAUTION: DO NOT short pin 2 to ground as this can damage the internal 8 V regulator . NOTE: DC voltage is applied to pin 1 for micro- phone operation. T ake care when using a non-Icom microphone. y GND (PTT ground) t PTT r Main readout squelch switch q M[...]

10 2 P ANEL DESCRIPTION ■ LCD display q TX INDICA TOR Indicates the frequency readout for transmit. w VFO/MEMOR Y CHANNEL INDICA TOR (pgs. 22, 51) Indicates the VFO mode or selected memory chan- nel number . e SELECT MEMOR Y CHANNEL INDICA TOR (p. 60) Indicates the displayed memory channel is set as a select memory channel. r MUL TI-FUNCTION SWIT[...]

11 2 P ANEL DESCRIPTION ATT 0FF METER Po P.AMP 1 BK-IN OFF 1/4 OFF BW 2.4k SFT 0 VFO FIL2 CW qw : pp AGC MID 1 TX VFO 1 USB CW CW FIL2 qr.qpp.pp qr.qpp.pp --. ---. -- --. ---. -- SCOPE VOICE KEYER MEMORY SCAN ANT 1 BK-IN BK-IN OFF OFF 1/4 1/4 OFF OFF AGC AGC MID MID CQ TEST CQ TEST DE ICOM ICOM CQ TEST CQ TEST DE ICOM ICOM TEST QRZ? CFM TU UR 5NN U[...]

12 2 P ANEL DESCRIPTION ■ Rear panel q TRANSVERTER JACK [XVERT] (p. 19) External transverter input/output jack. Activated by voltage applied to [ACC(2)] pin 6. w RECEIVE ANTENNA CONNECTOR [RX ANT] (p. 16) Connects a 50 Ω general coverage antenna with an RCA connector . e TUNER CONTROL SOCKET [TUNER] (p. 16) Accepts the control cable from an opt[...]

13 2 P ANEL DESCRIPTION !2 ANTENNA CONNECTOR 1 [ANT1] !3 ANTENNA CONNECTOR 2 [ANT2] (pgs. 14, 15) Accept a 50 Ω antenna with a PL-259 connector . When using an optional AH-4 HF/50 MHz AUTO- MA TIC ANTENNA TUNER or AH-3 HF AUTOMA TIC AN- TENNA TUNER , connect it to the [ANT1] connector . The internal antenna tuner activates for [ANT2] and deactiva[...]

3 14 INST ALLA TION AND CONNECTIONS ■ Unpacking After unpacking, immediately report any damage to the delivering carrier or dealer . Keep the shipping cartons. For a description and a diagram of accessory equip- ment included with the IC-756PROII, see ‘ Supplied ac- cessories ’ on p. 1 of this manual. ■ Selecting a location Select a locatio[...]

3 15 INST ALLA TION AND CONNECTIONS ■ Required connections • Front panel • Rear panel SWR S COMP ALC Po 0 10 10 25 50 100 20 1 0 1.5 2 3 1 5 9 +20 +4 0 + 60dB dB RIT/ TX TX F-1 SSB F-2 F-3 F-4 F-5 CW/RTTY AM/FM FILTER EXIT/SET 1 2 3 4 5 6 7 8 9 0 ENT NOTCH PBT CLR LOCK TX RX NOTCH TWIN PBT CW PITCH REC/PLAY LOCK/SPEECH RIT CLEAR SPLIT MP-W MP[...]

■ Advanced connections • Front panel • Rear panel 16 3 INST ALLA TION AND CONNECTIONS SWR S COMP ALC Po 0 10 10 25 50 100 20 1 0 1.5 2 3 1 5 9 +20 +4 0 + 60dB dB RIT/ TX TX F-1 SSB F-2 F-3 F-4 F-5 CW/RTTY AM/FM FILTER EXIT/SET 1 2 3 4 5 6 7 8 9 0 ENT NOTCH PBT CLR LOCK TX RX NOTCH TWIN PBT CW PITCH REC/PLAY LOCK/SPEECH RIT CLEAR SPLIT MP-W MP[...]

17 3 INST ALLA TION AND CONNECTIONS ■ Power supply connections Use the optional PS-125 DC power supply with a 25 A capacity when operating the transceiver with AC power . Refer to the diagrams below . CAUTION: Before connecting the DC power cable, check the following important items. Make sure: • The [POWER] switch is OFF . • Output voltage o[...]

18 3 INST ALLA TION AND CONNECTIONS ■ Linear ampli fi er connections Use the [ANT1] connector when connecting a linear ampli fi er . CONNECTING THE IC-PW1 T urn OFF the transceiver ’ s antenna tuner while tuning the IC-PW1 ’ s tuner . T o an antenna ACC-1 ANT ANT2 ANT1 ACC(2) INPUT1 INPUT2 REMOTE EXCITER 1 1&2 GND GND IC-PW1 AC outlet ([...]

■ External antenna tuner connection CONNECTING THE AH-4/AH-3 The AH-4 or AH-3 must be connected to [ANT1]. 19 3 INST ALLA TION AND CONNECTIONS 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 trans- mit any signals. (p. 13) While receiving, the [[...]

20 3 INST ALLA TION AND CONNECTIONS AF input Ground (GND) PTT SQUELCH input* RTTY keying * Connect the SQUELCH line when required. Terminal unit (TU) or Terminal Node Controller (TNC) [ACC(1)] socket (Rear panel view) 1 2 3 4 5 6 7 8 AFSK output AF input Ground (GND) Ground (GND) PTT SQUELCH input* * Connect the SQUELCH line when required. Terminal[...]

4 21 FREQUENCY SETTING Before fi rst applying power , make sure all connections required for your system are complete by referring to Chapter 3. Then, reset the transceiver using the fol - lowing procedure. Resetting CLEARS all programmed contents in memory channels and returns programmed values in set mode to default values. q Make sure the trans[...]

22 4 FREQUENCY SETTING ■ VFO description VFO is an abbreviation of V ariable Frequency Oscilla- tor , and traditionally refers to an oscillator . The transceiver ’ s VFO is somewhat dif ferent. The VFO of the IC-756PROII acts like a computer ’ s window and can show one frequency and one operating mode. Y ou can call up a desired frequency to [...]

23 4 FREQUENCY SETTING ■ Direct frequency entry with the keypad ■ Frequency setting with the tuning dial • For ham band use q Push the desired band key on the keypad 1 – 3 times. • 3 different frequencies can be selected on each band with the band key . (See “ Triple band stacking register ” below .) w Rotate the tuning dial to set th[...]

24 4 FREQUENCY SETTING ■ Advanced tuning functions SELECTING THE 1 Hz STEP The minimum tuning step of 1 Hz can be used for fi ne tuning. q T urn OFF the quick tuning step. •“ ▼ ” does not appear . w Push [TS] for 1 sec. to toggle the 1 Hz tuning step ON and OFF . • RIT and/or ∂ TX also functions in 1 Hz tuning step when used. SCOPE S[...]

5 25 RECEIVE AND TRANSMIT ■ Mode selection ■ T win PBT operation General PBT (Passband T uning) function electronically narrows the IF passband width by shifting the IF fre- quency to slightly outside of the IF fi lter passband to reject interference. This transceiver uses the DSP cir- cuit for the PBT function. Moving both [TWIN PBT] controls[...]

26 5 RECEIVE AND TRANSMIT ■ Notch function This transceiver has auto and manual notch func- tions. The auto notch function automatically attenu- ates 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. ➥ Push [NOTCH] to toggle the notch function be-[...]

27 5 RECEIVE AND TRANSMIT ■ Noise blanker The noise blanker eliminates pulse-type noise such as from car ignitions. The noise blanker is not avail- able for FM mode. 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 [...]

28 5 RECEIVE AND TRANSMIT The transceiver has 5 RTTY fi lters in addition to nor- mal IF filters. The passband width can be selected from 1 kHz, 500 Hz, 350 Hz, 300 Hz and 250 Hz. When the RTTY fi lter is turned ON, the RTTY tuning meter can be used. (p. 42) Moreover , the twin peak fi lter changes the receive fre- quency response by boosting 2 [...]

29 5 RECEIVE AND TRANSMIT ■ 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 received CW audio pitch can be adjusted in 25 Hz steps. The fi lter set mode screen graphically displays the CW pitch operations. (See below .) ■[...]

30 5 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 con- stant; fast, mid, slow) for non-FM mode. The FM mode AGC time constant is fixed as ‘ F AST ’ [...]

31 5 RECEIVE AND TRANSMIT ■ Dualwatch operation Dualwatch monitors 2 frequencies with the same mode simultaneously . During dualwatch, both frequencies should be on the same band, because the bandpass fi lter in the RF cir- cuit is selected for the main readout frequency . q Set a desired frequency . w Push [DUAL WA TCH] for 1 sec. • Equalized[...]

32 5 RECEIVE AND TRANSMIT ■ Split frequency operation Split frequency operation allows you to transmit and receive in the same mode on two dif ferent frequen- cies. The split frequency operation is basically per - formed using 2 frequencies on the main and sub readouts. The following is an example of setting 21.290 MHz for receiving and 21.310 MH[...]

33 5 RECEIVE AND TRANSMIT ■ Quick split function When you fi nd a DX station, an important considera- tion is how to set the split frequency . When you push the [SPLIT] switch for 1 sec., split fre- quency operation is turned ON, the sub readout is equalized to the main readout frequency and enters standby for transmit frequency input. This shor[...]

34 5 RECEIVE AND TRANSMIT ■ RIT and ∂ ∂ TX • RIT function The RIT function shifts the receive frequency up to ± 9.999 kHz in 1 Hz steps (10 Hz steps when can- celling the 1 Hz step readout) without moving the transmit frequency . • See #2 on p. 6 for function description. q Push the [RIT] switch. w Rotate the [RIT/ ∂ TX] control. e T o[...]

35 5 RECEIVE AND TRANSMIT ■ Monitor function The monitor function allows you to monitor your trans- mit IF signals in any mode through the speaker . Use this to check voice characteristics while adjusting SSB transmit tones. (p. 65) The CW sidetone func- tions regardless of the [MONITOR] switch setting. q Push [MONITOR]. • The indicator lights [...]

36 5 RECEIVE AND TRANSMIT ■ Meter function The transceiver has 4 transmit meter functions for your convenience. Select the desired meter with the [METER] switch. • Analog transmit meter ➥ Push [METER] to select RF power (Po) , SWR, ALC or compression level (COMP) . In addition, the transceiver can display the multi-func- tion digital meter in[...]

37 5 RECEIVE AND TRANSMIT ■ Speech compressor The RF speech compressor increases average RF output power , improving signal strength and readabil- ity in SSB. • 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. to toggle between narrow , middle or wide trans[...]

38 5 RECEIVE AND TRANSMIT ■ Digital voice recorder The transceiver has a total of 8 memory channels, 4 each for transmit and receive, of digital voice memo- ries. A maximum message length of 15 sec. can be recorded in each receive channel, and a total message length of 90 sec. can be recorded in transmit channels. Providing a transmission memory [...]

39 5 RECEIVE AND TRANSMIT • One-touch voice recording T o record the receiving signal contents immediately , one-touch voice recording is available. q Push [REC/PLA Y] for 1 sec. while receiving a sig- nal to start recording. •“ REC ” fl ashes. • Records audio into the channel R4. w Push [REC/PLA Y] momentarily to stop recording. • Rec[...]

RECEIVE AND TRANSMIT 5 40 ■ Digital voice recorder (continued) • Recording a message for transmit T o transmit a message using a voice recorder , record the desired message in advance as described below . q Push [EXIT/SET] several times to close a multi- function screen, if necessary . w Push [(F-2)VOICE] to call up the voice recorder screen. e[...]

41 5 RECEIVE AND TRANSMIT ■ Digital voice recorder (continued) • Sending a message for transmit q Push [EXIT/SET] several times to close a multi- function screen, if necessary . w Select a phone mode by pushing [SSB] or [AM/FM]. e Push [(F-2)VOICE] to call up the voice recorder screen. • If the receive voice memory channel (R1 – R4) appears[...]

42 5 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 con- troller (TNC) is not necessary for receiving a Baudot signal. q Push [EXIT/SET] several times to close a multi- function screen, if necessary . w Push [CW/[...]

43 5 RECEIVE AND TRANSMIT ■ 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. • Setting the electronic keyer q Push [EXIT/SET] several times, if necessary . w Push [CW/RTTY] to sel[...]

44 5 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. T otal 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 [...]

45 5 RECEIVE AND TRANSMIT ■ 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 multi- function screen, if nece[...]

46 5 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 mem- orize a selected antenna (ANT1, ANT2, ANT1/RX an- tenna and ANT2/RX antenna). When you change the operating frequency beyond a band, the previously used antenna is automatically selected for t[...]

47 5 RECEIVE AND TRANSMIT ■ Repeater operation A repeater ampli fi es received signals and retransmits them at a different frequency . When using a repeater , the transmit frequency is shifted from the receive fre- quency by an offset frequency . A repeater can be ac- cessed using split frequency operation with the shift frequency set to the rep[...]

48 5 RECEIVE AND TRANSMIT ■ T one squelch operation The tone squelch opens only when receiving a signal containing a matching subaudible tone. Y ou can silently wait for calls from group members using the same tone. q Push [VFO/MEMO] to select VFO mode. w Push the desired band key . e Push [AM/FM] several times to select FM mode. r Push [TONE] se[...]

49 5 RECEIVE AND TRANSMIT ■ Antenna tuner operation The internal automatic antenna tuner matches the transceiver to the connected antenna automatically . Once the tuner matches an antenna, the variable ca- pacitor angles are memorized as a preset point for each frequency range (100 kHz steps). Therefore, when you change the frequency range, the v[...]

50 5 RECEIVE AND TRANSMIT ■ Optional external tuner operation • AH-4/AH-3 HF AUTOMA TIC ANTENNA TUNER The AH-4/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). • See p. 19 for the transceiver and AH-4/AH-3 connection. • See the AH-4/AH-3 instru[...]

6 51 MEMOR Y OPERA TION ■ Memory channels The transceiver has 101 memory channels. The mem- ory mode is very useful for quickly changing to often- used 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 selection • Using th[...]

52 6 MEMORY OPERA TION ■ Memory channel screen The memory channel screen simultaneously shows 7 memory channels and their programmed contents. 13 memory channels can be displayed in the wide mem- ory channel screen. Y ou can select a desired memory channel from the memory channel screen. • Selecting a memory channel using the memory channel scr[...]

53 6 MEMORY OPERA TION ■ Memory channel programming Memory channel programming can be preformed ei- ther in VFO mode or in memory mode. • Programming in VFO mode q Set the desired frequency and operating mode in VFO mode. w Push [ Y ]/[ Z ] several times to select the desired memory channel. • Memory channel screen is convenient for selecting[...]

54 6 MEMORY OPERA TION ■ Frequency transferring The frequency and operating mode in a memory chan- nel can be transferred to the VFO. Frequency transferring can be performed in either VFO mode or memory mode. • T ransferring in VFO mode This is useful for transferring programmed contents to VFO. q Select VFO mode with [VFO/MEMO]. w Select the m[...]

55 6 MEMORY OPERA TION ■ Memory names All memory channels (including scan edges) can be tagged with alphanumeric names of up to 10 charac- ters each. Capital letters, small letters, numerals, some symbols (! # $ % & ¥ ? " ’ ` ^ + – ✱ / ., : ; = < > ( ) [ ] { } | _ _ ) and spaces can be used. • Editing (programming) memory [...]

56 6 MEMORY OPERA TION ■ Memo pads The transceiver has a memo pad function to store fre- quency and operating mode for easy write and recall. The memo pads are separate from memory channels. The default number of memo pads is 5, however , this can be increased to 10 in set mode if desired. (p. 71) Memo pads are convenient when you want to memo- r[...]

7 57 SCANS ■ Scan types ■ Preparation • Channels For programmed scan: Program scan edge frequencies into scan edge mem- ory channels P1 and P2. For ∂ F scan: Set the ∂ F span ( ∂ F scan range) in the scan screen. For memory scan: Program 2 or more memory channels except scan edge memory channels. For select memory scan: Designate 2 or m[...]

58 7 SCANS ■ Programmed scan operation q Push [EXIT/SET] several times to close a multi- function screen, if necessary . w Select VFO mode. e Select the desired operating mode. • The operating mode can also be changed while scan- ning. r Push [(F-5)SCAN] to select the scan screen. t Set [RF/SQL] open or closed. • See previous page for scan co[...]

59 7 SCANS ■ Fine programmed scan/ fi ne ∂ F scan Fine scan functions as programmed or ∂ F scan, but scan speed decreases when the squelch opens but does not stop. The scanning tuning step shifts from 50 Hz to 10 Hz while the squelch opens. q Push [EXIT/SET] several times to close a multi- function screen, if necessary . w Push [(F-5)SCAN] t[...]

60 7 SCANS ■ Select memory scan operation q Push [EXIT/SET] several times to close a multi- function screen, if necessary . w Select memory mode. e Push [(F-5)SCAN] to select the scan screen. r Set [RF/SQL] open or closed. • See p. 57 for scan condition. • If the [RF/SQL] control function is set as “ AUTO, ” the squelch is always open in [...]

61 7 SCANS ■ Scan set mode Scan set mode is used for programming scanning speed and scan resume condition. • Scan speed The transceiver has 2 speeds for scanning, high and low . q Push [EXIT/SET] several times to close a multi- function screen, if necessary . w Push [(F-5)SCAN] to select the scan screen. e Push [(F-5)SET] to select the scan set[...]

8 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 multi- function screen, if necessary . w Push [...]

63 8 CLOCK AND TIMERS ■ Setting power-off period The transceiver can be set to turn OFF automatically after being activated via the power-on timer . The power-off period can be set to 5 – 120 min. in 5 min. steps. q Push [EXIT/SET] several times to close a multi- function screen, if necessary . w Push [EXIT/SET] for 1 sec. then [(F-4)TIME] to e[...]

9 64 SET MODE ■ Set mode description Set mode is used for programming infrequently changed values or conditions of functions. This trans- ceiver has a level set mode, display set mode, timer set mode and miscellaneous (others) set mode. • Set mode operation q Push [EXIT/SET] several times to close a multi- function screen, if necessary . w Push[...]

65 9 SET MODE ■ Level set mode S S S S B B T T x x T T o o n n e e ( ( B B a a s s s s ) ) This item adjusts the bass level of the transmit audio tone in SSB mode from – 5 dB to +5 dB in 1 dB steps. 0dB 0 dB (default) S S S S B B T T x x T T o o n n e e ( ( T T r r e e b b l l e e ) ) This item adjusts the treble level of the transmit aud[...]

66 9 SET MODE ■ Display set mode T o adjust the LCD contrast or backlight, wait until the LCD becomes stable (10 min. or more after turn- ing power ON). This is an inherent characteristic of LCDs and LCD backlights and does not indicate a transceiver malfunction. C C o o n n t t r r a a s s t t ( ( L L C C D D ) ) This item adjusts the contrast o[...]

67 9 SET MODE M M y y C C a a l l l l Y our 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 multi- function screen, if necessary . w Push [EXIT/SET] for 1 sec. th[...]

68 9 SET MODE ■ T imer set mode T T i i m m e e ( ( N N o o w w ) ) This item sets the current time for the built-in 24-hour clock. See p. 62 for details. 1 1 5 5 : : 0 0 0 0 Push [(F-4)SET] to enter the time. T T i i m m e e r r F F u u n n c c t t i i o o n n This item sets the timer functions ON and OFF . When the power-ON timer or the power-O[...]

69 9 SET MODE ■ Miscellaneous (others) set mode (continued) Q Q u u i i c c k k D D u u a a l l w w a a t t c c h h When this item is set to ON, pushing [DUAL WA TCH] for 1 sec. sets the sub readout frequency to the main readout frequency and activates dualwatch operation. See p. 31 for details. O O N N Quick dualwatch ON (default) O O F F F F Qu[...]

70 9 SET MODE ■ Miscellaneous (others) set mode (continued) T T u u n n e e r r ( ( A A u u t t o o S S t t a a r r t t ) ) The internal antenna tuner has an automatic start ca- pability which starts tuning if the SWR is higher than 1.5 – 3:1. When “ OFF ” is selected, the tuner remains OFF even when the SWR is poor (1.5 – 3:1). When “ [...]

71 9 SET MODE ■ Miscellaneous (others) set mode (continued) R R T T T T Y Y D D e e c c o o d d e e U U S S O O S S This item selects the USOS (UnShift On Space) func- tion of the internal RTTY decoder . O O N N Decode as letter code (default) O O F F F F Decode as character code R R T T T T Y Y D D e e c c o o d d e e N N e e w w L L i i n n e e[...]

72 9 SET MODE ■ Miscellaneous (others) set mode (continued) M M A A I I N N D D I I A A L L A A u u t t o o T T S S This item sets the auto tuning step function. When ro- tating the tuning dial rapidly , the tuning step automat- ically changes several times as selected. There are 2 type of auto tuning steps: HIGH (Fastest) and LOW (Faster). H H I[...]

73 9 SET MODE ■ Miscellaneous (others) set mode (continued) E E x x t t e e r r n n a a l l K K e e y y p p a a d d 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). A A u u t t [...]

10 74 OPTION INST ALLA TION 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 elec- tric shock and/or equipment damage. ■ Openi[...]

11 75 MAINTENANCE SCAN ■ T roubleshooting The following chart is designed to help you correct problems which are not equipment malfunctions. If you are unable to locate the cause of a problem or solve it through the use of this chart, contact your near - est Icom Dealer or Service Center . PROBLEM POSSIBLE CAUSE SOLUTION REF . RECEIVE POWER TRANS[...]

76 11 MAINTENANCE ■ Fuse replacement If a fuse blows or the transceiver stops functioning, try to fi nd the source of the problem, and replace the dam- aged fuse with a new , rated fuse. CAUTION: DISCONNECT the DC power cable from the transceiver when changing a fuse. The IC-756PROII has 2 types of fuses installed for transceiver protection. •[...]

77 11 MAINTENANCE ■ T uning 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 fi gure at right. T urn the brake adjustment screw clockwise or coun- terclockwise to obtain a comfortable tension level while turning the di[...]

12 78 INTERNAL VIEWS PA fuse (FGB 5 A) PA unit FILTER unit Internal antenna tuner • T op view RF unit PLL unit Space for optional voice synthesizer (UT-102) MAIN unit Clock backup battery SPCH Optional voice synthesizer level adj. • Bottom view[...]

13 79 CONTROL COMMAND • 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 Communi- cations Interface-V (CI-V) controls the following func- tions of the transceiver . Up to 4 Icom CI-V transceivers or transceivers can be connected [...]

80 13 CONTROL COMMAND • Command table (continued) Command Sub command Description 0E A1 – A7 Set ∂ F scan span (A1=±5 kHz, A2=± 10 kHz, A3=±20 kHz, A4=± 50 kHz, A5=± 100 kHz, A6=± 500 kHz, A7=± 1 MHz) B0 Set as non-select channel B1 Set as select channel D0 Set scan resume OFF D3 Set scan resume ON 0F 00 Turn the split function OFF 01 [...]

81 13 CONTROL COMMAND • Command table (continued) Command Sub command Description 1A 0547 Send/read cut number style (0=Normal, 1=190 → ANO, 2=90 → ON, 3=190 → ANT , 4=90 → NT) 0548 Send/read count up trigger chan- nel (1=M1, 2=M2, 3=M3, 4=M4) 0549 Send/read present number (1 – 9999) 0550 Send/read CW keyer repeat time (1=1 sec. to 60=6[...]

• T o 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 T o send or read the desired band stacking register ’ s con- tents, combined code of the frequency band and register cod[...]

14 83 SPECIFICA TIONS • General • Frequency coverage : (Unit: MHz) USA and Rx 0.030 – 60.000* 1 * 2 others Tx 1.800 – 1.999* 2 3.500 – 3.999* 2 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 Europe (#23) Rx 0.030 – 29.9[...]

15 84 OPTIONS IC-PW1 HF/50 MHz ALL BAND 1 kW LINEAR AMPLIFIER Full-duty 1 kW linear ampli fi er including an automatic antenna tuner . Has automatic tuning and band selection capability . Full break-in (QSK) oper- ation is possible. The ampli fi er/power supply unit and the remote control unit are separated. AH-4 HF/50 MHz AUTOMA TIC ANTENNA TUNE[...]

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