Icom IC-756 manuel d'utilisation

INSTR UCTION MANU AL i756 HF/50 MHz ALL MODE TRANSCEIVER[...]

R W ARNING HIGH V OL T A GE! NEVER attach an antenna or internal antenna connector during trans- mission. This ma y result in an electrical shock or b urn. R NEVER apply A C to the [DC13.8V] sock et on the transceiv er rear panel. This could cause a fire or ruin the transceiv er . R NEVER apply more than 16 V DC , such as a 24 V batter y , to the [...]

UNP A CKING T ABLE OF CONTENTS ii qw e r t Accessories included with the IC-756: Qty . q DC power cab le (OPC-025A) .............................. 1 w Hand microphone (HM-36) .................................. 1 e Spare fuses (FGB 20 A) ...................................... 2 r Spare fuse (FGB 5 A) .......................................... 1 t CW[...]

1 1 P ANEL DESCRIPTION ■ Fr ont panel TIMER POWER TRANSMIT PHONES ELEC-KEY MIC TUNER MONITOR NB NR AF BAL NR RF/SQL MIC GAIN RF POWER COMP KEY SPEED BK-IN DELAY S Po 0 10 1 1 1.5 2 3 5 9 +20 +40 +60dB 25 50 100 ％ ∞ SWR ALC F-1 SSB F-2 F-3 F-4 F-5 CW RTTY AM FM HF/50MHz TRANSCEIVER i756 1ß VFO VFO 14.195.000 VFO VFO USB USB USB 14.100.00 1[...]

2 1 P ANEL DESCRIPTION i RF GAIN CONTROL/SQ UELCH CONTROL [RF/SQL] (outer control) Adjusts the RF gain and squelch threshold le v el. The squelch remov es noise output from the speak er (closed condition) when no signal is received. - The squelch is par ticularly effectiv e for FM. It is also av ailable f or other modes. - The control can be set as[...]

NB NR BAL NR COMP KEY SPEED BK-IN DELAY APF APF LOCK TX RX AUTO NOTCH TWIN PBT CW PITCH F-1 SSB F-2 F-3 F-4 F-5 SPEECH LOCK RIT/ TX TX RIT CLEAR CW RTTY AM FM SPLIT MP-W MP-R DUAL WA TCH VFO/ MEMO MAIN/ SUB CHANGE 1.8 1 3.5 2 7 3 10 4 14 5 18 6 21 7 24.5 8 28 9 GENE ・ 50 0 F-INP ENT ▲ ▼ MW M-CL TS XFC i756 1ß VFO VFO 14.195.000 VFO VFO US[...]

• T urns the speech compressor ON and OFF in SSB and AM modes. (p . 34) • Enters memor y ke yer set mode in CW mode. (pgs . 35, 36) • T urns the 1 ⁄ 4 function ON and OFF in R TTY mode. (p . 24) - 1 ⁄ 4 function sets dial rotation to 1 ⁄ 4 of normal for fi ne tuning. ✔ What is the speech compressor? The speech compressor compresses t[...]

5 1 P ANEL DESCRIPTION #0 LOCK SWITCH [LOCK] (p . 38) T urns the dial lock function ON and OFF . #1 RIT/ ∂ ∂ TX CONTR OL [RIT/ ∂ ∂ TX ] (p . 29) Shifts the receive and/or transmit frequency without changing the transmit and/or receiv e frequency while the RIT and/or ∂ TX functions are ON. - Rotate the control clockwise to increase the fre[...]

6 1 P ANEL DESCRIPTION #6 A UDIO PEAK FIL TER CONTROL [APF ] (inner control; p . 27) V aries the peak frequency of the audio peak fi lter to pick out a CW signal from interf erence while the APF function is ON. #7 A UDIO PEAK FIL TER SWITCH [APF ] (p . 27) • T urns the audio peak filter ON and OFF when pushed. - The APF indicator appears in the [...]

7 1 P ANEL DESCRIPTION $7 MEMOR Y UP/DO WN SWITCHES [ Y Y ]/[ Z Z ] (p . 41) • Select the memor y channel number f or the se- lected readout. - Memory channels can be selected both in VFO and memor y modes. • Select the desired memor y channel directly after pushing [F-INP] and a memor y channel number . $8 MEMOR Y WRITE SWITCH [MW] (p. 43) Sto[...]

• MICROPHONE CONNECT OR (F ront panel view) CA UTION: DO NO T shor t pin 2 to ground as this can damage the internal 8 V regulator. y GND (PTT ground) t PTT r Main readout squelch switch q Microphone input w +8 V DC output e Frequency up/down u GND (Microphone ground) i Main readout AF output (varies with [AF]/[BAL]) 8 1 P ANEL DESCRIPTION ■ Mi[...]

9 1 P ANEL DESCRIPTION 1ß VFO 14.195.000 VFO USB USB USB 14.100.00 14.205.000 14.205.000 USB USB USB 14.100.00 56 56 ß MARKER MARKER HOLD HOLD MAX-H MAX-H   EXIT EXIT ANT 1 METER Po P.AMP OFF ATT OFF AGC MID VOX OFF COMP OFF SPAN SPAN TX 2.4k 2.4k 9 2.8k 2.8k 455 455 12:34 12:34 Grid 2.5k 10dB -12.5k SPECTRUMSCOPE+12.5k 32[...]

10 1 P ANEL DESCRIPTION 80% 95% F-1 F-1 F-2 F-3 F-4 F-5 [15k  ] [ ] [NONE  ] [FILTER SELECTION] [FILTER SELECTION] 9MHz 9MHz 455kHz 455kHz DEF DEF  EXIT EXIT AGC AGC MID MID VOX VOX OFF OFF COMP COMP  OFF OFF SSB 2.4K [15k  ] [9k  ] [ ] [NONE  ] 2.8K 98--.---.[...]

q RECEIVE ANTENNA CONNECT OR [RX ANT] (p . 15) Connects a 50 Ω general co v er age antenna with an RCA connector . w TUNER CONTROL SOCKET [TUNER] (p . 15) Accepts the control cable from an optional AH-3 HF A UT OMA TIC ANTENNA TUNER . e A CCESSOR Y SOCKET 1 [ACC(1)] r A CCESSOR Y SOCKET 2 [ACC(2)] Enable connection to e xter nal equipment such as[...]

12 1 P ANEL DESCRIPTION !1 ANTENNA CONNECT OR 1 [ANT1] !2 ANTENNA CONNECT OR 2 [ANT2] (pgs. 13, 14) Accept a 50 Ω antenna with a PL-259 connector . NO TE: When using an optional AH-3 HF A UT OMA TIC ANTENNA TUNER , connect it to the [ANT1] connector . The inter nal antenna tuner activates f or [ANT2] and deactivates f or [ANT1] when connecting th[...]

■ Unpac king After unpacking, immediately report any damage to the delivering carrier or dealer . Keep the shipping cartons. F or a description and a diagram of accessory equip- ment included with the IC-756, see UNP A CKING on p . ii of this manual. ■ Selecting a location Select a location f or the transceiv er that allows ade- quate air circu[...]

TIMER POWER TRANSMIT PHONES ELEC-KEY MIC TUNER MONITOR NB NR MIC GAIN RF POWER COMP KEY SPEED BK-IN DELAY AF RF/SQL BAL NR APF LOCK TX RX AUTO NOTCH TWIN PBT APF CW PITCH S Po 0 10 1 1 1.5 2 3 5 9 +20 +40 +60dB 25 50 100 ％ ∞ SWR ALC F-1 SSB F-2 F-3 F-4 F-5 SPEECH LOCK RIT/ TX TX RIT CLEAR CW RTTY AM FM SPLIT MP-W MP-R DUAL WATCH VFO/ MEMO MAIN/[...]

15 2 INST ALLA TION AND CONNECTIONS ■ Adv anced connections • Front panel TIMER POWER TRANSMIT PHONES ELEC-KEY MIC TUNER MONITOR NB NR MIC GAIN RF POWER COMP KEY SPEED BK-IN DELAY AF RF/SQL BAL NR APF LOCK TX RX AUTO NOTCH TWIN PBT APF CW PITCH S Po 0 10 1 1 1.5 2 3 5 9 +20 +40 +60dB 25 50 100 ％ ∞ SWR ALC F-1 SSB F-2 F-3 F-4 F-5 SPEECH LOCK[...]

16 2 INST ALLA TION AND CONNECTIONS ■ P ower suppl y connections Use an optional PS-85 DC POWER SUPPL Y , etc. when operating the transceiv er with A C power . Ref er to the diagrams belo w . CONNECTING AN ICOM DC PO WER SUPPL Y to DC power socket PS-85 AC outlet AC cable Transceiver CONNECTING A NON-ICOM DC PO WER SUPPL Y to DC power socket Non-[...]

17 2 INST ALLA TION AND CONNECTIONS ■ Linear ampli fi er connections Transceiver Ground IC-4KL Remote controller Coaxial cable (supplied with the IC-4KL) ACC cable (supplied with the IC-4KL) ACC IC-4KL Remote control cable (supplied with the IC-4KL) AC outlet (220 – 240 V) To an antenna ANT1 ACC(2) Use the [ANT1] connector when connecting a li[...]

18 2 INST ALLA TION AND CONNECTIONS ■ External antenna selector or antenna tuner connections CONNECTING THE EX-627 Ground Coaxial cable (supplied with the EX-627) ACC cable (supplied with the EX-627) EX-627 ANT1 ACC(2) CONNECTING THE AH-3 Coaxial cable (from the AH-3) Long wire or optional AH-2b Ground IC-756 AH-3 ANT1 Control cable CONNECTING TH[...]

T o connect a terminal unit, TNC or scan conv er ter , ref er to the diagram below . F or RTTY oper ation The optional 250 Hz CW narrow fi lters may not pass R TTY signals. Be sure to select the appropriate IF fi lters corresponding to the signal width. (p . 28) AF input Ground (GND) PTT SQUELCH input* RTTY keying * Connect the SQUELCH line when [...]

Description Command Frequency setting 05 Operating mode LSB USB AM CW RTTY FM 06 VFO mode selection MAIN ↔ SUB MAIN = SUB Dualwatch OFF Dualwatch ON Main readout selection Sub readout selection 07 Memory mode selection Memory channel selection 08 Memory write Memory transfer to VFO Memory clear 09 0A 0B Scan stop Start programmed/memory scan Star[...]

21 3 FREQUENCY SETTING ■ When fi r st applying po wer (CPU resetting) Bef ore fi rst applying power , make sure all connections required f or your system are complete by ref erring to chapter 2. Then, reset the transceiver using the f ollow- ing procedure. NO TE: Resetting CLEARS all programmed con- tents in memor y channels and returns program[...]

• Differences between VFO mode and memory mode 22 3 FREQUENCY SETTING ■ VFO description VFO is an abbre viation of V ariable F requency Oscilla- tor , and traditionally refers to an oscillator . The transceiv er ’ s VFO is somewhat diff erent. The VFO of the IC-756 acts lik e a computer ’ s window and can show one frequency and one operatin[...]

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

A UTO TUNING STEP FUNCTION (AM/FM only) When selecting AM or FM, the quick tuning step is au- tomatically selected by the auto tuning step function. 24 3 FREQUENCY SETTING ■ Adv anced tuning functions QUICK TUNING STEP The operating frequency can be changed in kHz steps (1, 5, 9 or 10 kHz selectable) f or quick tuning. q Push [TS] momentarily to [...]

■ T win PBT operation The twin PBT (P assband T uning) function electronically narrows the receiv er ’ s IF passband widths to reduce interf erence. Moving both [TWIN PBT] controls to the same position shifts the IF . - The LCD shows the passband width graphically . V ariable range depends on the fi lter selection. ± 1.29 kHz in 15 Hz steps a[...]

26 4 RECEIVE AND TRANSMIT ■ A uto notch function The auto notch function automatically attenuates more than 3 beat tones, tuning signals, etc., e ven if they are mo ving. The auto notch functions in SSB mode only . q Select SSB mode. w Push [A UTO NO TCH] to tur n the auto notch func- tion ON. e Push [A UTO NO TCH] again to cancel the function. U[...]

The receiv ed CW audio pitch and monitored CW audio can be adjusted to suit your pref erences (300 to 900 Hz) without changing the operating frequency . The received CW audio pitch can be adjusted in 3 Hz steps. ■ APF function The APF (A udio P eak Filter) changes the receiv e fre- quency response by boosting a par ticular frequency f or better c[...]

The fi lter selection s witches the IF passband width as shown in the tab le at right. The fi lter selection is automatically memorized in each mode. When an optional fi lter is installed, set the optional fi l- ter setting in set mode. (p . 55) Optional fi lters are not selected by def ault. q If the star t up screen is not selected (if [F-5][...]

When you fi nd a DX station on 21.025 MHz/CW and the station is picking up stations tr ansmitting slightly up from 21.025 MHz. q Push [RIT] and [ ∂ TX] to turn both the RIT and ∂ TX functions ON. w Rotate [RIT/ ∂ TX] to find the DX station ’ s receiv e fre- quency . e When you fi nd the DX station ’ s receive frequency , push [RIT] to t[...]

30 4 RECEIVE AND TRANSMIT 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 f or the main readout frequency . q Set a desired frequency . w Push [DU AL W A TCH] for 2 sec. - Equalized receiv e frequency and [...]

31 4 RECEIVE AND TRANSMIT Split frequency operation allows y ou to transmit and receiv e in the same mode on two diff erent frequen- cies. The split frequency operation is basically per- f or med using 2 frequencies on the main and sub readouts. F ollo wing is an e xample of setting 21.290 MHz for re- ceiving and 21.310 MHz f or transmitting. q Set[...]

32 4 RECEIVE AND TRANSMIT When you fi nd a DX station, an important considera- tion is how to set the split frequency . When you push the [SPLIT] s witch for 2 sec., split fre- quency operation is turned ON, the sub readout is equalized to the main readout frequency and enters standby f or transmit frequency input. This shor tens the time needed t[...]

33 4 RECEIVE AND TRANSMIT The monitor function allows y ou to monitor your tr ans- mit IF signals in any mode through the speak er . Use this to check v oice characteristics while adjusting transmit tones . (p . 54) The CW sidetone functions re- gardless of the [MONIT OR] s witch setting. q Push [MONIT OR]. - The indicator lights when the monitor f[...]

34 4 RECEIVE AND TRANSMIT The transceiv er has 3 transmit meter functions f or your con venience . Select the desired meter with the [METER] s witch. • Push [METER] to select RF power (P o), SWR or ALC f or transmit metering. ■ Meter function The RF speech compressor increases av erage RF output power , improving signal strength and readabil- i[...]

35 4 RECEIVE AND TRANSMIT The transceiv er has an electronic k e y er . Ke ying speed can be adjusted with [KEY SPEED]. K eying w eight, the ratio of dot : space : dash, can be set from 1 : 1 : 2.8 t o 1:1:4 . 5 i n k e y e r set mode. • Setting the electronic ke yer q Push [CW] to select CW mode. w Push [KEYER] to select ke yer set mode . e Push[...]

36 4 RECEIVE AND TRANSMIT The memor y ke yer memorizes and can re-transmit 4 CW ke y codes f or often-used CW sentences, antenna types, etc. T otal capacity of the memor y k ey er is 55 characters in each memory channel. • Programming the memory ke yer q Push [CW] to select CW mode. w Push [KEYER] to select ke yer set mode . e Push [ (F-2) EDIT] [...]

37 4 RECEIVE AND TRANSMIT This function allows y ou to displa y 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 f or monitoring band conditions in an instant. q If the star t up screen is not selected (if [F-5] ’ s func- tion is [EXIT]), push [F-5] one [...]

38 4 RECEIVE AND TRANSMIT A repeater ampli fi es receiv ed signals and retransmits them at a diff erent frequency . When using a repeater , the transmit frequency is shifted from the receiv e fre- quency by an offset frequency . A repeater can be ac- cessed using split frequency operation with the shift frequency set to the repeater ’ s offset f[...]

■ Antenna tuner operation The internal automatic antenna tuner matches the transceiv er to the connected antenna automatically . Once the tuner matches an antenna, the v ar iable ca- pacitor angles are memor ized as a preset point f or each frequency range (100 kHz steps). Therefore , when you change the frequency r ange , the v ariable ca- pacit[...]

• AH-3 HF A UT OMA TIC ANTENNA TUNER The AH-3 matches the IC-756 to a long wire antenna more than 3 m/10 ft long (3.5 MHz and abov e) or more than 12 m/40 ft long (1.8 MHz and abov e). • See p . 18 for the tr ansceiver and AH-3 connection. • See the AH-3 instruction manual for AH-3 installation and antenna connection details. AH-3 setting exa[...]

41 5 MEMOR Y OPERA TION ■ Memory channels The transceiv er has 101 memory channels. The mem- or y mode is v er y useful f or quickly changing to often- used frequencies. All 101 memor y channels are tunable which means the programmed frequency can be tuned tempor ar ily with the tuning dial, etc. in memor y mode. MEMOR Y CHANNEL MEMOR Y CHANNEL N[...]

42 5 MEMOR Y OPERA TION ■ Memory channel screen The memor y channel screen simultaneously sho ws 9 memor y channels and their programmed contents . Y ou can select a desired memor y channel from the memor y channel screen. • Selecting a memory channel using the memory channel screen q If the star t up screen is not selected (if [F-5] ’ s func[...]

43 5 MEMOR Y OPERA TION ■ Memory channel pr ogramming Memor y channel programming can be pref or med ei- ther in VFO mode or in memor y mode. • Programming in VFO mode q Set the desired frequency and operating mode in VFO mode. w Push [ Y ]/[ Z ] sev eral times to select the desired memor y channel. - Memor y channel screen is conv enient for s[...]

44 5 MEMOR Y OPERA TION • T ransferring in VFO mode This is useful for tr ansf err ing programmed contents to VFO . q Select VFO mode with [VFO/MEMO]. w Select the memor y channel to be transf erred with [ Y ]/[ Z ]. - Memor y channel screen is conv enient for selecting the desired channel. - Memory channel contents appear in the memor y channel [...]

45 5 MEMOR Y OPERA TION All memor y channels (including scan edges) can be tagged with alphanumeric names of up to 10 charac- ters each. Letters (capitals), numerals , some symbols ( ⁄ , ?, M ) and spaces can be used. • Editing (programming) memory names q If the star t up screen is not selected (if [F-5] ’ s func- tion is [EXIT]), push [F-5][...]

46 5 MEMOR Y OPERA TION • Writing frequencies and operating modes into memo pads Y ou can simply wr ite the accessed readout frequency and operating mode b y pushing [MP-W]. When you write a 6th frequency and operating mode, the oldest written frequency and operating mode are automatically erased to make room f or the new set- tings. NO TE: Each [...]

47 6 SCANS ■ Scan types ■ Preparation • Channels F or programmed scan: Program scan edge frequencies into scan edge mem- or y channels P1 and P2. F or ∂ F scan: Set the ∂ F span ( ∂ F scan range) in the scan screen. F or memor y scan: Program 2 or more memory channels e xcept scan edge memor y channels. F or select memor y scan: Designa[...]

48 6 SCANS q If the star t up screen is not selected (if [F-5] ’ s func- tion is [EXIT]), push [F-5] one or more times to exit. w Select VFO mode. e Select the desired operating mode. - The oper ating mode can also be changed while scan- ning. r Push [ (F-4) SCAN] to select the scan screen. t Set [RF/SQL] open or closed. - See pre vious page for [...]

49 6 SCANS Fine scan functions as programmed or ∂ F scan, b ut scan speed decreases when the squelch opens and does not stop . The scanning tuning step shifts from 50 Hz to 10 Hz while the squelch opens. q Select the scan screen from the star t up screen by pushing [ (F-4) SCAN]. w Set f or prog rammed scan or ∂ F scan as descr ibed on pre viou[...]

50 6 SCANS q If the star t up screen is not selected (if [F-5] ’ s func- tion is [EXIT]), push [F-5] one or more times to exit. w Select memor y mode. e Select the desired operating mode. - The oper ating mode can also be changed while scan- ning. r Push [ (F-4) SCAN] to select the scan screen. t Set [RF/SQL] open or closed. - See p . 47 for scan[...]

51 7 CLOCK AND TIMERS The transceiv er has a built-in 24-hour cloc k with power-off and po wer-on timer functions . This is useful when logging QSO ’ s and so on. The clock indication is alwa ys display ed except after pushing [F-INP]. q If the star t up screen is not selected (if [F-5] ’ s func- tion is [EXIT]), push [F-5] one or more times to[...]

52 7 CLOCK AND TIMERS The transceiv er can be set to tur n OFF automatically after being activ ated via the power-on timer . The pow er-off per iod can be set to 5 – 120 min. in 5 min. steps. q If the star t up screen is not selected (if [F-5] ’ s func- tion is [EXIT]), push [F-5] one or more times to exit. w Push [ (F-5) SET] then [ (F-3) TIME[...]

53 8 SET MODE ■ Set mode description Set mode is used f or programming infrequently changed values or conditions of functions . This trans- ceiver has a le vel set mode, displa y set mode, timer set mode and miscellaneous (others) set mode. • Set mode operation q If the star t up screen is not selected (if [F-5] ’ s func- tion is [EXIT]), pus[...]

Tx tone (Treble) This item adjusts the treble le v el of the transmit audio tone in SSB/AM mode from – 12 dB to +12 dB in 2 dB steps. 54 8 SET MODE Tx tone (Bass) This item adjusts the bass le vel of the transmit audio tone in SSB/AM mode from – 12 dB to +12 dB in 2 dB steps. ■ Level set mode 0dB 0 dB (default) 0dB 0 dB (default) [...]

55 8 SET MODE Power-ON timer set This item sets the power-on time . See p . 51 for details . Time (now) This item sets the current time f or the b uilt-in 24-hour clock. See p . 51 for details . ■ Timer set mode 15:00 Push [ (F-4) SET] to enter the time. 15:00 Push [ (F-4) SET] to enter the time. Power-OFF period This item sets the power-off peri[...]

56 8 SET MODE Beep (band edge) A beep sounds when an operating frequency enters or e xits an amateur band. This functions independent of the con fi rmation beep setting (above). The volume le vel can be set in le v el set mode. (p . 54) Beep (confirmation) A beep sounds each time a s witch is pushed to con- fi r m it. This function can be tur ned[...]

57 8 SET MODE FM split offset (HF) This item sets the offset (diff erence betw een tr ansmit and receive frequencies) f or the quick split function. Howe ver , this setting is used f or HF bands in FM mode only and is used to input the repeater offset f or an HF band. The offset frequency can be set from – 4 MHz to +4 MHz in 1 kHz steps. ■ Misc[...]

58 8 SET MODE Tuner (PTT start) T uning of the internal antenna tuner can be star ted automatically at the moment the PTT is pushed after the operating frequency is changed (more than 1% from last-tuned frequency). ON OFF Automatic PTT start ON Automatic PTT start OFF (default) [ANT] switch Y ou can set the antenna connector selection to auto- mati[...]

59 8 SET MODE ■ Miscellaneous (others) set mode (contin ued) Speech speed When the optional UT -102 VOICE SYNTHESIZER UNIT is installed, you can select betw een f aster or slower syn- thesizer output. See p . 61 for unit installation. HIGH LOW Faster announcement (default) Slower announcement Speech S-level When the optional UT -102 VOICE SYNTHES[...]

60 8 SET MODE CI-V transceive T ransceiv e operation is possible with the IC-756 con- nected to other Icom HF transceiv ers or receivers . When “ ON ” is selected, changing the frequency , op- erating mode , etc. on the IC-756 automatically changes those of connected transceiv ers (or re- ceivers) and vice v ersa. ON OFF Transceive ON (default)[...]

61 9 OPTION INST ALLA TIONS The UT -102 announces the accessed readout ’ s fre- quency , mode, etc. (S-meter le vel can also be an- nounced — p . 59) in a clear , electronically-generated voice , in English (or Japanese). q Remov e the top and bottom cov ers as shown abov e. w Remov e the protective paper attached to the bot- tom of the UT -102[...]

62 9 OPTION INST ALLA TIONS Se v eral IF fi lters are a v ailab le f or the IC-756. Y ou can install 2 fi lters f or 9 MHz and 455 kHz IF . Choose ap- propriate fi lter(s) for y our operating needs. 9 MHz optional fi lters: FL-100 CW NARRO W FIL TER 500 Hz/ – 6 dB FL-101 CW NARRO W FIL TER 250 Hz/ – 6 dB FL-223 SSB NARRO W FIL TER 1.9 kHz/ [...]

63 10 MAINTENANCE ■ T roubleshooting The f ollowing char t is designed to help y ou correct problems which are not equipment malfunctions . If you are unab le to locate the cause of a problem or solv e it through the use of this char t, contact your nearest Icom Dealer or Ser vice Center . PROBLEM POSSIBLE CAUSE SOLUTION REF. POWER Power does not[...]

CIRCUITR Y FUSE REPLACEMENT The 13.8 V DC from the DC power cab le is applied to all units in the IC-756, e xcept for the po wer ampli fi er , through the circuitr y fuse. This fuse is installed in the P A unit. q Remov e the top cov er as shown on p . 61. w Remov e 11 screws from the P A shielding plate, then remov e the plate. e Replace the circ[...]

65 10 MAINTENANCE The tension of the tuning dial ma y be adjusted to suit your pref erence. The brak e adjustment screw is located on the right side of the tuning dial. See the fi gure at right. T urn the brake adjustment scre w clockwise or coun- terclockwise to obtain a comf or table tension le vel while tur ning the dial continuously and e venl[...]

PA fuse (FGB 5 A) PA unit Clock backup battery FILTER unit Internal antenna tuner 66 11 INTERNAL VIEWS • T op view RF unit R572 Optional voice synthesizer level adj. Space for optional 455 kHz filter PLL unit Space for optional 9 MHz filter Space for optional voice synthesizer (UT-102) MAIN unit Space for optional high-stability crystal unit (CR-[...]

67 12 SPECIFICA TIONS ■ General • F requency cover age: Receive 1 0.030 – 60.000 MHz* 1 T ransmit 0 1.800 – 0 1.999 MHz* 2 0 3.500 – 1 3.999 MHz* 2 0 7.000 – 1 7.300 MHz* 2 10.100 – 10.150 MHz 14.000 – 14.350 MHz 18.068 – 18.168 MHz 21.000 – 21.450 MHz 24.890 – 24.990 MHz 28.000 – 29.700 MHz 50.000 – 54.000 MHz* 2 * 1 Some[...]

68 13 OPTIONS IC-4KL HF 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) operation is possible . The ampli fi er/po wer supply unit and the remote control unit are separated. EX-627 A UTOMA TIC ANTENNA SELECT OR Automatically sel[...]

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