Icom IC-756 Instruction Manual
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Icom IC-756 Instruction Manual

Hf/50 mhz all mode transceiver
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INSTRUCTION MANUAL
HF/50 MHz
ALL MODE TRANSCEIVER
i756

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Summary of Contents for Icom IC-756

  • Page 1 INSTRUCTION MANUAL HF/50 MHz ALL MODE TRANSCEIVER i756...

  • Page 2: Important

    Use Icom microphones only (supplied or optional). Other manufacturer’s microphones have different pin assignments and connection to the IC-756 may dam- age the transceiver. The explicit definitions described at left apply to this in- struction manual.

  • Page 3: Table Of Contents

    6 SCANS ... 47–50 Scan types ... 47 Preparation ... 47 Programmed scan operation ... 48 Accessories included with the IC-756: q DC power cable (OPC-025A) ... 1 w Hand microphone (HM-36) ... 1 e Spare fuses (FGB 20 A) ... 2 r Spare fuse (FGB 5 A) ...

  • Page 4: Panel Description

    MIC GAIN CONTROL [MIC GAIN] Adjusts microphone input gain. How to set the microphone gain. Set the [MIC] control so that the ALC meter sometimes swings during normal voice transmission in SSB mode. Recommended level for an Icom microphone 14.195.000 14.205.000 14.205.000 RTTY (dot)
  • Page 5 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.
  • Page 6 PANEL DESCRIPTION i756 COMP KEY SPEED BK-IN DELAY !8 MULTI-FUNCTION SWITCHES • Push to select the functions indicated in the LCD display to the right of these switches. - Functions vary depending on the operating condition. • Push to input a character for memory keyer pro- gramming or memory name.
  • Page 7 • Turns the speech compressor ON and OFF in SSB and AM modes. (p. 34) • Enters memory keyer set mode in CW mode. (pgs. 35, 36) • Turns the ⁄ function ON and OFF in RTTY mode. (p. 24) ⁄...
  • Page 8 PANEL DESCRIPTION i756 COMP KEY SPEED BK-IN DELAY #0 LOCK SWITCH [LOCK] (p. 38) Turns the dial lock function ON and OFF. #1 RIT/∂ ∂ TX CONTROL [RIT/∂ ∂ TX Shifts the receive and/or transmit frequency without changing the transmit and/or receive frequency while the RIT and/or ∂TX functions are ON.
  • Page 9 - [GENE] selects the general coverage band. • Pushing the same key 2 or 3 times calls up other stacked frequencies in the band. (p. 23) - Icom’s triple band stacking register memorizes 3 fre- quencies in each band. • After pushing [F-INP quency or memory channel.
  • Page 10 PANEL DESCRIPTION i756 COMP KEY SPEED BK-IN DELAY $7 MEMORY UP/DOWN SWITCHES [Y Y ]/[Z Z ] (p. 41) • Select the memory channel number for the se- lected readout. - Memory channels can be selected both in VFO and memory modes.

  • Page 11: Microphone (Hm-36)

    Microphone (HM-36) q UP/DOWN SWITCHES [UP]/[DN] Change the selected readout frequency or memory 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.

  • Page 12: Lcd Display

    PANEL DESCRIPTION LCD display q TX INDICATOR Indicates the frequency readout for transmit. w VFO/MEMORY CHANNEL INDICATOR (pgs. 22, 41) Indicates the VFO mode or selected memory chan- nel number. e SELECT MEMORY CHANNEL INDICATOR (p. 50) Indicates the displayed memory channel is set as a select memory channel.

  • Page 13: Screen Menu Arrangement

    Screen menu arrangement The following screens can be selected from the start up screen. Choose the desired screen using the fol- lowing chart. Pushing [ EXIT] one or more times returns to the (F-5) start up screen. See p. 53 for set mode arrangement. •Start up screen 14.195.000 14.205.000...

  • Page 14: Rear Panel

    (pgs. 15, 68) Accepts an 4–8 i ALC INPUT JACK [ALC] (p. 17) Connects to the ALC output jack of a non-Icom lin- ear amplifier. o SEND CONTROL JACK [SEND] (p. 17) Goes to ground while transmitting to control external equipment such as a linear amplifier.
  • Page 15 !1 ANTENNA CONNECTOR 1 [ANT1] !2 ANTENNA CONNECTOR 2 [ANT2] (pgs. 13, 14) Accept a 50 antenna with a PL-259 connector. NOTE: When using an optional AH-3 , connect it to the [ANT1] connector. ANTENNA TUNER The internal antenna tuner activates for [ANT2] and deactivates for [ANT1] when connecting the AH-3.

  • Page 16: Installation And Connections

    In this case, an antenna tuner is useful to match the transceiver and antenna. Low SWR allows full power for transmitting even when using the antenna tuner. The IC-756 has an SWR meter to monitor the antenna SWR continuously. antenna,...

  • Page 17: Required Connections

    Required connections • Front panel CW KEY A straight key can be used when the internal electronic keyer is turned OFF in keyer set mode. (p. 35) • Rear panel ANTENNA 1, 2 (p. 13) [Example]: ANT1 for 1.8–18 MHz bands ANT2 for 21–50 MHz bands GROUND (p.

  • Page 18: Advanced Connections

    ▲ SPLIT ▼ DUAL WATCH 24.5 8 CHANGE AUTO NOTCH ・ F-INP M-CL GENE VFO/ MEMO CW PITCH MP-W MP-R MAIN/ LOCK CLEAR RIT/ SPEECH LOCK RTTY [RELAY], [ALC] (p. 17) Used for connecting a non-Icom linear ampli- fier. SP-20...

  • Page 19: Power Supply Connections

    Power supply connections Use an optional PS-85 DC POWER SUPPLY operating the transceiver with AC power. Refer to the diagrams below. CONNECTING AN ICOM DC POWER SUPPLY AC outlet PS-85 AC cable CONNECTING A NON-ICOM DC POWER SUPPLY AC outlet Non-Icom power supply 13.8 V 20 A...

  • Page 20: Linear Amplifier Connections

    80 W max. with the [RF POWER] control, otherwise, a protection cir- cuit will activate. CONNECTING A NON-ICOM POWER AMPLIFIER R WARNING: Set the transceiver output power and linear amplifier ALC output level referring to the linear ampli- fier instruction manual.

  • Page 21: External Antenna Selector Or Antenna Tuner Connections

    HF and 50 MHz operation. Use a coaxial antenna switch when you operate the 50 MHz band with the AH-3 connected. Coaxial cable (from the AH-3) ANT1 IC-756 CONNECTING THE IC-AT500 THROUGH THE IC-2KL To an antenna...

  • Page 22: Fsk And Afsk (Sstv) Connections

    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 The optional 250 Hz CW narrow filters may not pass RTTY signals. Be sure to select the appropriate IF filters corresponding to the signal width.

  • Page 23: Remote Jack (Ci-V) Information

    RS-232C port. The Icom Communi- cation Interface-V (CI-V) controls the following func- tions of the transceiver. Up to four Icom CI-V transceivers or receivers can be connected to a personal computer equipped with an RS-232C port. See p. 60 for setting the CI-V condition using set mode.

  • Page 24: Frequency Setting

    FREQUENCY SETTING When first applying power Before first applying power, make sure all connections required for your system are complete by referring to chapter 2. Then, reset the transceiver using the follow- ing procedure. NOTE: Resetting CLEARS all programmed con- tents in memory channels and returns programmed values in set mode to default values.

  • Page 25: Vfo Description

    The transceiver’s VFO is somewhat different. The VFO of the IC-756 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.

  • Page 26: Frequency Setting With The Tuning Dial

    FREQUENCY SETTING 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.) 21.200.00 w Rotate the tuning dial to set the desired frequency.

  • Page 27: Advanced Tuning Functions

    Advanced tuning functions QUICK TUNING STEP The operating frequency can be changed in kHz steps (1, 5, 9 or 10 kHz selectable) for quick tuning. q Push [TS] momentarily to display the quick tuning indicator. Quick tuning indicator 14.100.00 w Rotate the tuning dial to change the frequency in programmed kHz steps.

  • Page 28: Receive And Transmit

    RECEIVE AND TRANSMIT Mode selection The following modes are available in the IC-756: SSB (LSB/USB), CW, CW-R (CW reverse), RTTY, RTTY-R (RTTY reverse), AM, FM and FM-T (FM with subaudible tone). Narrow modes of each of these are also available.

  • Page 29: Auto Notch Function

    Auto notch function The auto notch function automatically attenuates more than 3 beat tones, tuning signals, etc., even if they are moving. The auto notch functions in SSB mode only. q Select SSB mode. w Push [AUTO NOTCH] to turn the auto notch func- tion ON.

  • Page 30: Apf Function

    RECEIVE AND TRANSMIT APF function The APF (Audio Peak Filter) changes the receive fre- quency response by boosting a particular frequency for better copying of desired CW signals. The peak frequency can be adjusted with [APF] from 300 to 900 Hz manually.

  • Page 31: Filter Selection

    FL-232 FL-52A FL-53A 455 kHz FL-222 FL-257 information The IC-756 can use the optional FL-257 . It has 3.3 kHz/–6 dB passband width. FILTER To use the FL-257, select FL-222 and SSB narrow mode. 455 kHz IF filter SFPC455E (15 kHz)

  • Page 32: Rit And ∂Tx

    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.

  • Page 33: Dualwatch Operation

    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 cir- cuit is selected for the main readout frequency. q Set a desired frequency. w Push [DUALWATCH] for 2 sec.

  • Page 34: Split Frequency Operation

    RECEIVE AND TRANSMIT Split frequency operation Split frequency operation allows you to transmit and receive in the same mode on two different frequen- cies. The split frequency operation is basically per- formed using 2 frequencies on the main and sub readouts.

  • Page 35: Quick Split Function

    Quick split function When you find a DX station, an important considera- tion is how to set the split frequency. When you push the [SPLIT] switch for 2 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.

  • Page 36: Monitor Function

    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 transmit tones. (p. 54) The CW sidetone functions re- gardless of the [MONITOR] switch setting.

  • Page 37: Meter Function

    Meter function The transceiver has 3 transmit meter functions for your convenience. Select the desired meter with the [METER] switch. • Push [METER] to select RF power (Po), SWR or ALC for transmit metering. [METER] switch Speech compressor The RF speech compressor increases average RF output power, improving signal strength and readabil- ity in SSB.

  • Page 38: Electronic Cw Keyer

    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. •...

  • Page 39: Memory Keyer

    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 [CW] to select CW mode. w Push [KEYER] to select keyer set mode.

  • Page 40: Spectrum Scope Screen

    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.

  • Page 41: Repeater Operation

    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 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 frequency.

  • Page 42: Antenna Tuner Operation

    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 variable ca- pacitors are automatically preset to the memorized point.

  • Page 43: Optional External Tuner Operation

    Optional external tuner operation • AH-3 HF AUTOMATIC 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 above) or more than 12 m/40 ft long (1.8 MHz and above).

  • Page 44: Memory Operation

    MEMORY OPERATION Memory channels The transceiver has 101 memory channels. The mem- ory mode is very useful for quickly changing to often- used frequencies. MEMORY MEMORY CHANNEL CHANNEL NUMBER Regular memory 1–99 channels Scan edge memory P1, P2 channels Memory channel selection •...

  • Page 45: Memory Channel Screen

    Memory channel screen The memory channel screen simultaneously shows 9 memory channels and their programmed contents. You can select a desired memory channel from the memory channel screen. • Selecting a memory channel using the memory channel screen q If the start up screen is not selected (if [F-5]’s func- tion is [EXIT]), push [F-5] one or more times to exit.

  • Page 46: Memory Channel Programming

    MEMORY OPERATION 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.

  • Page 47: Frequency Transferring

    Frequency transferring The frequency and operating mode in a memory chan- nel 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].

  • Page 48: Memory Names

    MEMORY OPERATION Memory names All memory 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 start up screen is not selected (if [F-5]’s func- tion is [EXIT]), push [F-5] one or more times to exit.

  • Page 49: Memo Pads

    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. 59) •...

  • Page 50: Scans

    SCANS Scan types PROGRAMMED SCAN Repeatedly scans between two scan edge frequencies (scan edge memory channels P1 and P2). Scan edge P1 or P2 Scan Jump This scan operates in VFO mode. MEMORY SCAN Repeatedly scans all programmed memory channels. (select) Mch 2 Mch 3...

  • Page 51: Programmed Scan Operation

    Programmed scan operation q If the start 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 operating mode can also be changed while scan- ning.

  • Page 52: Fine Programmed Scan/ Fine ∂F Scan

    SCANS Fine programmed scan/fine ∂ ∂ F scan Fine scan functions as programmed or ∂F scan, but 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 start up screen by pushing [ SCAN].

  • Page 53: Select Memory Scan Operation

    Select memory scan operation q If the start up screen is not selected (if [F-5]’s func- tion is [EXIT]), push [F-5] one or more times to exit. w Select memory mode. e Select the desired operating mode. - The operating mode can also be changed while scan- ning.

  • Page 54: Clock And Timers

    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 If the start up screen is not selected (if [F-5]’s func- tion is [EXIT]), push [F-5] one or more times to exit.

  • Page 55: Setting Power-Off Period

    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 If the start up screen is not selected (if [F-5]’s func- tion is [EXIT]), push [F-5] one or more times to exit.

  • Page 56: Set Mode

    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 If the start up screen is not selected (if [F-5]’s func- tion is [EXIT]), push [F-5] one or more times to exit.

  • Page 57: Level Set Mode

    Level set mode This item adjusts the bass level of the transmit audio tone in SSB/AM mode from –12 dB to +12 dB in 2 dB steps. This item adjusts the treble level of the transmit audio tone in SSB/AM mode from –12 dB to +12 dB in 2 dB steps.

  • Page 58: Timer Set Mode

    SET MODE Timer set mode This item sets the current time for the built-in 24-hour clock. See p. 51 for details. This item sets the power-on time. See p. 51 for details. This item sets the power-off period for automatic shut- down after the power-on timer has turned power ON.
  • Page 59 Miscellaneous (others) set mode A beep sounds each time a switch is pushed to con- firm it. This function can be turned OFF for silent op- eration. The volume level can be set in level set mode. (p. 54) A beep sounds when an operating frequency enters or exits an amateur band.
  • Page 60 SET MODE Miscellaneous (others) set mode This item sets the offset (difference between transmit and receive frequencies) for the quick split function. However, this setting is used for HF bands in FM mode only and is used to input the repeater offset for an HF band.
  • Page 61 Miscellaneous (others) set mode Tuning of the internal antenna tuner can be started automatically at the moment the PTT is pushed after the operating frequency is changed (more than 1% from last-tuned frequency). You can set the antenna connector selection to auto- matic, manual or non-selection (when using 1 an- tenna only).
  • Page 62 SET MODE Miscellaneous (others) set mode The spectrum scope shows the transmit signal wave- form while transmitting. This can be deactivated if de- sired. When “OFF” is selected, the spectrum scope holds the received waveform while transmitting and does not show the transmit waveform. When the optional UT-102 installed, you can select between English and Japan- ese as the language.
  • Page 63 To distinguish equipment, each CI-V transceiver has its own Icom standard address in hexadecimal code. The IC-756’s address is 50h. When 2 or more IC-756’s are connected to an op- tional CT-17 , rotate the tuning CI-V LEVEL CONVERTER dial to select a different address for each IC-756 in the range 01h to 7Fh.

  • Page 64: Option Installations

    OPTION INSTALLATIONS 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. q Remove 2 screws from the left side of the trans- ceiver to remove the carrying handle as shown below.

  • Page 65: Optional If Filters

    Optional IF filters Several IF filters are available for the IC-756. You can install 2 filters for 9 MHz and 455 kHz IF. Choose ap- propriate filter(s) for your operating needs. 9 MHz optional filters: FL-100 500 Hz/–6 dB CW NARROW FILTER FL-101 250 Hz/–6 dB...

  • Page 66: Maintenance

    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 • DC power cable is improperly connected. • Fuse is blown.

  • Page 67: Fuse Replacement

    CAUTION: Disconnect the DC power cable from the transceiver when changing a fuse. The IC-756 has 2 types of fuses installed for trans- ceiver protection. • DC power cable fuses ... FGB 20 A • Circuitry fuse ... FGB 5 A CIRCUITRY FUSE REPLACEMENT The 13.8 V DC from the DC power cable is applied to...

  • Page 68: Tuning Dial Brake Adjustment

    MAINTENANCE Tuning dial brake adjustment The tension of the tuning dial may be adjusted to suit your preference. The brake adjustment screw is located on the right side of the tuning dial. See the figure at right. Turn the brake adjustment screw clockwise or coun- terclockwise to obtain a comfortable tension level while turning the dial continuously and evenly in one direction.

  • Page 69: Internal Views

    • Top view PA unit PA fuse (FGB 5 A) • Bottom view Reference freq. check point (cable from J81; 60.000 MHz) RF unit Space for optional high-stability crystal unit (CR-502) PLL unit INTERNAL VIEWS Internal antenna tuner FILTER unit Clock backup battery Space for optional 9 MHz filter...

  • Page 70: Specifications

    SPECIFICATIONS General • Frequency coverage: Receive 10.030–60.000 MHz* Transmit 01.800–01.999 MHz* 03.500–13.999 MHz* 07.000–17.300 MHz* 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* Some frequency bands are not guaranteed. 1.830–1.850, 3.500–3.800, 7.000–7.100, 50.200–51.200 for France version. •...

  • Page 71: Options

    • FL-53A: 250 Hz/–6 dB (CW nar.) • FL-222: 1.8 kHz/–6 dB (SSB nar.) • FL-257: 3.3 kHz/–6 dB (SSB wide) CT-16 SATELLITE INTERFACE UNIT Easy tuning when connecting another Icom VHF transceiver for instant satellite commu- nications. CT-17 CI-V LEVEL CONVERTER...
  • Page 72 Count on us! A-5415H-1EX-e Printed in Japan 6-9-16 Kamihigashi, Hirano-ku, Osaka 547, Japan Copyright © 1996 by Icom Inc.

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