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INSTRUCTION MANUAL
HF/50 MHz
ALL MODE TRANSCEIVER
i756
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IMPORTANT READ THIS INSTRUCTION MANUAL SAVE THIS INSTRUCTION MANUAL. This in- CAREFULLY before attempting to operate the struction manual contains important safety and oper- transceiver. ating instructions for the IC-756. PRECAUTIONS AVOID placing the transceiver against walls or putting RWARNING HIGH VOLTAGE! NEVER attach anything on top of the transceiver. This will obstruct an antenna or internal antenna connector during trans- heat dissipation. mission. This may result in an electrical shock
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TABLE OF CONTENTS IMPORTANT ..................................... i 4 RECEIVE AND TRANSMIT ... 25–40 ∂F scan operation ........................ 48 Mode selection ............................. 25 Fine programmed scan/ PRECAUTIONS ................................ i Twin PBT operation ....................... 25 fine ∂F scan .................................. 49 EXPLICIT DEFINITIONS .................. i Auto notch function ....................... 26 Memory scan operation ................
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1 PANEL DESCRIPTION Front panel !7 !6 !5 !4 !3 TIMER POWER q 9 +20 5 ANT ANT 9 2.4k 2.4k 455 455 2.8k 2.8k +40 1 +60dB 12:34 12:34 1 25 10 50 USB 100 TX TX 0 S TRANSMIT Po 3 VFO VFO 1.5 2 1 METER METER SWR 14.195.000 Po Po ALC w 1ß 14.100.00 14.100.00 USB USB P.AMP P.AMP OFF OFF HF/50MHz TRANSCEIVER i756 USB ß PHONES ATT ATT 56 56 14.205.000 14.205.000 TUNER MONITOR NB NR OFF OFF VFO VFO 14.100.00 14.100.00 USB USB e AGC AGC MID MID AF RF/SQL BAL NR ELEC-KEY VOX VOX OFF OFF r COMP COMP MIC
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1 PANEL DESCRIPTION i RF GAIN CONTROL/SQUELCH CONTROL !0 BALANCE CONTROL [BAL] (inner control; p. 30) [RF/SQL] (outer control) Adjusts the audio output balance between main and Adjusts the RF gain and squelch threshold level. sub readout frequencies while in dualwatch. The squelch removes noise output from the speaker BAL NR (closed condition) when no signal is received. Increases main Increases sub readout gain readout gain - The squelch is particularly effective for FM. It is also available fo
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1 PANEL DESCRIPTION @9@8@7@6@5 TWIN PBT 1.8 1 3.5 2 7 3 SPLIT ANT ANT 9 2.4k 2.4k 455 455 2.8k 2.8k 12:34 12:34 1 10 4 14 5 18 6 DUAL TX TX USB WATCH VFO VFO METER METER 14.195.000 21 7 24.5 8 28 9 MW Po Po CHANGE 1ß 14.100.00 14.100.00 USB USB APF AUTO NOTCH F-INP P.AMP P.AMP GENE 50 0 M-CL ENT VFO/ OFF OFF MEMO i756 USB APF CW PITCH MP-W MP-R TS ß ATT ATT MAIN/ 56 56 14.205.000 14.205.000 NB NR SUB OFF OFF !8 VFO VFO 14.100.00 14.100.00 USB USB RX XFC AGC AGC MID MID TX LOCK BAL NR VOX VO
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1 PANEL DESCRIPTION •Turns the speech compressor ON and COMP COMP @2 LCD FUNCTION SWITCHES [F-1]–[F-5] OFF OFF OFF in SSB and AM modes. (p. 34) Push to select the function indicated in the LCD dis- •Enters memory keyer set mode in CW play above these switches. KEYER KEYER mode. (pgs. 35, 36) - Functions vary depending on the operating condition. 1 •Turns the ⁄4 function ON and OFF in 1/4 1/4 OFF OFF RTTY mode. (p. 24) @3 SPEECH SWITCH [SPEECH] (pgs. 59, 61) 1 1 - ⁄4 function sets dial rotation
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1 PANEL DESCRIPTION $6 $5$4$3 $2 $1 $0 #9 TWIN PBT 1.8 1 3.5 2 7 3 SPLIT ANT ANT 9 2.4k 2.4k 455 455 2.8k 2.8k 12:34 12:34 1 DUAL 10 4 14 5 18 6 TX TX USB WATCH VFO VFO METER METER 14.195.000 21 7 24.5 8 28 9 MW Po Po CHANGE 1ß 14.100.00 14.100.00 USB USB APF AUTO NOTCH F-INP P.AMP P.AMP GENE 50 0 ENT M-CL VFO/ #8 OFF OFF MEMO i756 USB APF CW PITCH TS ß MP-W MP-R #7 ATT ATT 56 56 MAIN/ 14.205.000 14.205.000 NB NR SUB OFF OFF VFO VFO 14.100.00 14.100.00 USB USB RX XFC AGC AGC #6 MID MID TX L
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1 PANEL DESCRIPTION #6 AUDIO PEAK FILTER CONTROL [APF] TWIN PBT TWIN PBT TWIN PBT (inner control; p. 27) – + Varies the peak frequency of the audio peak filter to pick out a CW signal from interference while the APF function is ON. APF CW PITCH Lower frequency Higher frequency Approx. 300 Hz Approx. 900 Hz Low cut Center High cut #7 AUDIO PEAK FILTER SWITCH [APF] (p. 27) $0 LOCK INDICATOR [LOCK] (p. 38) •Turns the audio peak filter ON and OFF when Lights when the dial lock function is activated.
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1 PANEL DESCRIPTION $7$8$9%0%1 TWIN PBT 1.8 1 3.5 2 7 3 SPLIT ANT ANT 9 2.4k 2.4k 455 455 2.8k 2.8k 12:34 12:34 1 10 4 14 5 18 6 DUAL TX TX USB WATCH VFO VFO METER METER 14.195.000 21 7 24.5 8 28 9 MW Po Po CHANGE 1ß 14.100.00 14.100.00 USB USB APF AUTO NOTCH F-INP P.AMP P.AMP GENE 50 0 M-CL ENT VFO/ OFF OFF MEMO i756 USB APF CW PITCH MP-W MP-R TS ß ATT ATT MAIN/ 56 56 14.205.000 14.205.000 NB NR SUB OFF OFF VFO VFO 14.100.00 14.100.00 USB USB RX XFC AGC AGC MID MID TX LOCK BAL NR VOX VOX R
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1 PANEL DESCRIPTION Microphone (HM-36) q w q UP/DOWN SWITCHES [UP]/[DN] w PTT SWITCH Change the selected readout frequency or memory Push and hold to transmit; release to receive. channel. - 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. 35) •MICROPHONE CONNECTOR (Front pa
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1 PANEL DESCRIPTION LCD display !5 !4!3 !2 !1 !0 o ANT APF APF 320 320 9 2.4k 2.4k 455 455 2.8k 2.8k 12:34 12:34 1 USB USB q TX VFO w METER i 14.195.000 Po 1ß 14.100.00 USB u P.AMP e OFF USB USB ß ATT w 56 56 14.205.000 14.205.000 i OFF VFO 14.100.00 USB u AGC -12.5k SPECTRUM SCOPE +12.5k MID Grid r 2.5k 10dB VOX OFF y COMP OFF SPAN SPAN MARKER MARKER MAX-H MAX-H HOLD HOLD EXIT EXIT t q TX INDICATOR i FREQUENCY READOUTS (p. 23) Indicates the frequency readout for transmit. Show the opera
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1 PANEL DESCRIPTION Screen menu arrangement The following screens can be selected from the start up screen. Choose the desired screen using the fol- lowing chart. •Spectrum scope screen (p. 37) ANT ANT 9 2.4k 2.4k 455 455 2.8k 2.8k Pushing [(F-5)EXIT] one or more times returns to the 12:34 12:34 1 TX USB USB start up screen. See p. 53 for set mode arrangement. 80% VFO VFO METER METER 14.195.000 Po Po 1ß 14.100.00 14.100.00 USB USB P.AMP P.AMP OFF OFF F-1 USB USB ß ATT ATT 56 56 14.205.000 14
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1 PANEL DESCRIPTION Rear panel !3 !2 !1 !0 q wertyui o q RECEIVE ANTENNA CONNECTOR [RX ANT] y CI-V REMOTE CONTROL JACK [REMOTE] (p. 15) (p. 20) Connects a 50 Ω general coverage antenna with an •Designed for use with a personal computer for re- RCA connector. mote control of transceiver functions. •Used for transceive operation with another Icom w TUNER CONTROL SOCKET [TUNER] (p. 15) CI-V transceiver or receiver. Accepts the control cable from an optional AH-3 HF AUTOMATIC ANTENNA TUNER. u EXT
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1 PANEL DESCRIPTION !1 ANTENNA CONNECTOR 1 [ANT1] !3 GROUND TERMINAL [GND] (pgs. 13, 14) !2 ANTENNA CONNECTOR 2 [ANT2] (pgs. 13, 14) Connect this terminal to a ground to prevent electri- Accept a 50 Ω antenna with a PL-259 connector. cal shocks, TVI, BCI and other problems. NOTE: When using an optional AH-3 HF AUTOMATIC ANTENNA TUNER, connect it to the [ANT1] connector. The internal antenna tuner activates for [ANT2] and deactivates for [ANT1] when connecting the AH-3. D ACC SOCKETS ACC(1) PIN N
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2 INSTALLATION AND CONNECTIONS Unpacking Antenna After unpacking, immediately report any damage to the For radio communications, the antenna is of critical im- delivering carrier or dealer. Keep the shipping cartons. portance, along with output power and sensitivity. Se- lect antenna(s), such as a well-matched 50 Ω antenna, For a description and a diagram of accessory equip- and feedline. 1.5:1 of Voltage Standing Wave Ratio ment included with the IC-756, see UNPACKING on (VSWR) is recommend
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2 INSTALLATION AND CONNECTIONS Required connections • Front panel TIMER TWIN PBT CW KEY 1.8 1 3.5 2 7 3 SPLIT POWER 9 +20 5 +40 1 +60dB 25 50 DUAL 10 4 14 5 18 6 10 100 0 WATCH TRANSMIT S Po 1.5 2 3 1 SWR 21 7 24.5 8 28 9 MW ALC CHANGE APF AUTO NOTCH F-INP GENE 50 0 M-CL ENT VFO/ MEMO HF/50MHz TRANSCEIVER i756 APF CW PITCH MP-W MP-R TS PHONES MAIN/ TUNER MONITOR NB NR SUB RX XFC TX LOCK AF RF/SQL BAL NR ELEC-KEY RIT TX CLEAR MIC RIT/ TX F-1 F-2 F-3 F-4 F-5 SPEECH LOCK SSB CW RTTY AM FM MI
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2 INSTALLATION AND CONNECTIONS Advanced connections •Front panel TIMER TWIN PBT SPLIT 1.8 1 3.5 2 7 3 POWER 5 9 +20 HEADPHONES +40 1 +60dB 25 10 4 14 5 18 6 10 50 DUAL 100 WATCH S 0 TRANSMIT Po 2 3 1 1.5 SWR 21 7 24.5 8 28 9 MW ALC CHANGE APF AUTO NOTCH F-INP GENE 50 0 ENT M-CL VFO/ MEMO HF/50MHz TRANSCEIVER i756 APF CW PITCH MP-W MP-R TS PHONES MAIN/ TUNER MONITOR NB NR SUB RX XFC TX LOCK AF RF/SQL BAL NR ELEC-KEY RIT TX CLEAR MIC RIT/ TX F-1 F-2 F-3 F-4 F-5 SPEECH LOCK SSB CW RTTY AM FM
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2 INSTALLATION AND CONNECTIONS Power supply connections CAUTION: Before connecting the DC power cable, check the following important items. Make sure: Use an optional PS-85 DC POWER SUPPLY, etc. when •The [POWER] switch is OFF. operating the transceiver with AC power. Refer to the • Output voltage of the power source is 12–15 V when you diagrams below. use a non-Icom power supply. •DC power cable polarity is correct. Red : positive + terminal Black : negative _ terminal CONNECTING AN ICOM DC P
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2 INSTALLATION AND CONNECTIONS Use the [ANT1] connector when connecting a linear Linear amplifier connections amplifier. CONNECTING THE IC-4KL Coaxial cable (supplied with the IC-4KL) To an antenna ACC cable (supplied with the IC-4KL) ACC IC-4KL Remote IC-4KL controller Transceiver Remote control cable (supplied with the IC-4KL) Ground AC outlet (220–240 V) NOTE: Turn OFF the transceiver’s antenna tuner while tuning the IC-4KL’s tuner. CONNECTING THE IC-2KL ACC cable (supplied with the IC-2KL) T
