Icom IC-746PRO Instruction Manual
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Icom IC-746PRO Instruction Manual

Hf/vhf all mode transceiver
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See also: Service Manual
INSTRUCTION MANUAL
HF/VHF
ALL MODE TRANSCEIVER
i746PRO
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.

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Summary of Contents for Icom IC-746PRO

  • Page 1 INSTRUCTION MANUAL HF/VHF ALL MODE TRANSCEIVER i746PRO 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.

  • Page 2: Important

    E- Mails and newsgroup postings, the engineering team at Icom is proud to say “many of these changes were compiled from a list of suggestions from you, the ama- teur radio operator!”...

  • Page 3: Table Of Contents

    Spare fuse (FGB 5 A) ... 1 t CW keyer plug (AP-330) ... 1 Icom, Icom Inc. and the logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United King- dom, Germany, France, Spain, Russia and/or other countries. TABLE OF CONTENTS I Electronic keyer functions ...

  • Page 4: Quick Reference Guide

    110/220 V AC, also know as Household current, to a steady source of 13.8 V DC. The perfect match to your IC-746PRO is the PS-125. This compact switching power supply is the matching power supply for your IC-746PRO with a current rat- ing of 25 A continuous duty.
  • Page 5 There are three connections on the back of your IC-746PRO, two for HF and 6 m and one for 2 m. If you are using one antenna for HF and 6 m, for simplicity, connect the antenna coax to ANT 1.

  • Page 6: I Operation

    5. Connect other peripheral equipment Everyone has his or her favorite ad-on gear; now is the time to connect this gear! We will cover the basic devices that can be connected to your IC-746PRO. I Operation 1. Voice Microphones: Connect the microphone to the eight- pin connector on the front of the radio.

  • Page 7: I Your First Contact

    HEADPHONES I Your first contact Now you should have your IC-746PRO installed in your shack, and like a kid on his birthday, you are probably excited to get on the air. We would like to take you through a few basic operation steps to make your first “On The Air”...
  • Page 8 D D Just listening 1. Select the desired band On your IC-746PRO, an easy way of changing bands is by using the keypad located just above the tuning knob on the right hand side of the display. You will no- tice each switch has two sets of numbers;...
  • Page 9 QRN from the desired signal. a. Noise Reduction: The noise reduction system on your IC-746PRO is part of the 32-bit DSP. This is used to reduce the hiss and QRM levels. To acti- vate, push the [NR] switch located just to the right of the [PHONES] jack.
  • Page 10 NOTCH Low frequency d. Filters: Your IC-746PRO has an incredible IF DSP based filter network with over 100 settings. • Dial in your filters: By pushing [FILTER] for 1 sec., you enter the filter set mode. This is where you are able set the three filter presets.
  • Page 11 d. Filters:— continued • On the fly adjustment: Once the adjustments have been made in the filter set mode, you can make on the fly changes by using the Twin Pass Band Tuning, Twin PBT. You will be able to see the effects of the Twin PBT on the upper left hand side of the screen.

  • Page 12: I Ready To Call Cq

    [MIC GAIN]: Max. CCW [RF PWR]: Max. CCW 1. Setting up your transmit audio The 32-bit DSP in your IC-746PRO is capable of al- lowing you to selects transmit audio for phone modes. 2. Mic Gain The microphone gain is used for proper transmit audio level for full output power.
  • Page 13 3. DSP TX Audio Pass Band The capability of changing the pass band of your transmit audio, is at your finger tips. Regardless of the condition of the speech compressor, you can adjust it by selecting the [F4 You will find this located in the ] for 1 sec.

  • Page 14: Panel Description

    PANEL DESCRIPTION I Front panel POWER TRANSMIT PHONES ELEC-KEY q POWER SWITCH [POWER] ➥ Push momentarily to turn power ON. • Turn the optional DC power supply ON in advance. ➥ Push for 1 sec. to turn power OFF. w TRANSMIT SWITCH [TRANSMIT] Selects transmitting or receiving.
  • Page 15 SSB mode. Make sure that voice peak readings do not exceed the ALC range brackets on the meter. Recommended level for an Icom microphone Decreases Increases MIC GAIN i AF CONTROL [AF] (inner control) Varies the audio output level from the speaker.
  • Page 16 PANEL DESCRIPTION I Front panel (continued) i746PRO HF/VHF TRANSCEIVER TUNER NOTCH /NOTCH RF/SQL MENU MIC GAIN RF PWR CW PITCH KEY SPEED P.AMP/ATT !9 @0 !8 MULTI-FUNCTION SWITCHES [F1]–[F5] ➥Push to select the function indicated in the LCD display above these switches. (p. 11) •...
  • Page 17 @3 VOX/BREAK-IN SWITCH [VOX/BK-IN] ➥ In SSB, AM and FM modes, push momentarily to turn the VOX function ON and OFF (p. 55); push for 1 sec. to enter VOX set mode (p. 55). ➥ In CW mode, push momentarily to turn the semi break-in, full break-in or break-in OFF (p.
  • Page 18 PANEL DESCRIPTION I Front panel (continued) i746PRO HF/VHF TRANSCEIVER NOTCH /NOTCH RF/SQL MENU CW/RTTY MIC GAIN RF PWR CW PITCH KEY SPEED P.AMP/ATT #8 TRANSMIT FREQUENCY CHECK SWITCH [XFC] (pgs. 45, 48) Monitors the transmit frequency when pushed and held. •...
  • Page 19 ➥ Pushing the same key 2 or 3 times calls up other stacked frequencies and modes in the band. (p. 19) • Icom’s triple band stacking register memorizes 3 fre- quencies in each band. ➥ After pushing [F-INP], enter a keyed frequency.

  • Page 20: I Rear Panel

    IC-746PRO, before connecting to [SEND]. o ALC INPUT JACK [ALC] (p. 17) Connects to the ALC output jack of a non-Icom lin- ear amplifier. !0 ACCESSORY SOCKET 2 [ACC(2)] !1 ACCESSORY SOCKET 1 [ACC(1)]...
  • Page 21 D DATA SOCKET DATA PIN No. NAME DATA IN Input terminal for data transmit. (1200 bps: AFSK/9600 bps: G3RUH, GMSK) Common ground for DATA IN, DATA OUT and AF OUT. PTT P PTT terminal for packet operation. Connect ground to transmit data. DATA OUT Data out terminal for 9600 bps operation only.

  • Page 22: I Lcd Display

    PANEL DESCRIPTION I LCD display q FREQUENCY READOUTS Shows the operating frequency. w MULTI-FUNCTION METER INDICATION ➥ Shows receiving signal strength, etc. during re- ceive. ➥ Shows transmit output power, ALC and SWR dur- ing transmit. e VOX INDICATOR (p. 55) Appears when the VOX function is activated.
  • Page 23 I LCD display (continued) !5 BREAK-IN INDICATORS (p. 56) ➥ “F BK-IN” appears when the full break-in function is activated. ➥ “BK-IN” appears when the semi break-in function is activated. !6 MONITOR INDICATOR (p. 57) Appears when the monitor function is activated. !7 PREAMP INDICATORS (p.

  • Page 24: I Multi Function Switches

    PANEL DESCRIPTION I Multi function switches M1 FUNCTIONS During SSB operation During SSB data operation During CW operation During RTTY operation During AM operation During FM operation AGC (p. 49) ➥ Push momentarily to change the time constant of the AGC circuit. ➥...

  • Page 25: Panel Description ........... 1

    Frequency down Squelch open Squelch closed CAUTION: can damage the internal 8 V regulator. NOTE: DC voltage is applied to pin 1 for micro- phone operation. Take care when using a non-Icom microphone. MICROPHONE MICROPHONE CABLE MICROPHONE PLUG 10µ 4700p 0.33µ...

  • Page 26: Installation And Connections

    Low SWR allows full power for transmitting even when using the antenna connect the [GND] tuner. The IC-746PRO has an SWR meter to moni- tor the antenna SWR continuously. Protect your transceiver from lightning 30 mm Slide the coupling ring down.

  • Page 27: I Required Connections

    I Required connections • Front panel CW KEY (dot) (com) (dash) A straight key can be used when the internal electronic keyer is turned OFF in keyer set mode. (p. 34) • Rear panel 144 MHz ANTENNA (pgs. 13, 75) DC POWER SUPPLY PS-125 (Optional)

  • Page 28: I Advanced Connections

    144 ENT A /B V / M M-CL M-CH MP-W MP-R LOCK ∂TX CLEAR RIT/∂TX FILTER LOCK/ CALL MONITOR SPCH [SEND], [ALC] (p. 17) Used for connecting a non-Icom linear ampli- fier. [DATA] (p. 78) EXTERNAL SPEAKER (p. 101) SP-21 (optional)

  • Page 29: I Power Supply Connections

    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. Black PS-125...

  • Page 30: I Linear Amplifier Connections

    ACC(1) REMOTE IC-PW1 AC outlet (Non-European versions: 100—120/220—240 V European version Turn OFF the transceiver’s antenna tuner while tuning the IC-PW1’s tuner. CONNECTING A NON-ICOM LINEAR AMPLIFIER To an antenna RF OUTPUT RF INPUT SEND Non-Icom linear amplifier I External antenna tuner connections CONNECTING THE AH-4 The AH-4 must be connected to [ANT1].

  • Page 31: Basic Operation

    I 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 fol- lowing procedure. NOTE: When first applying power or when operat- ing in cold environments, the display may flicker or appear faint.

  • Page 32: I Selecting An Operating Band

    BASIC OPERATION I Selecting an operating band The transceiver has a triple band stacking register. This means that the last 3 operating frequencies and modes used on a particular band are automatically memorized. See the table below for a list of the bands available and the default settings for each register.

  • Page 33: I Selecting Vfo/Memory Mode

    I Selecting VFO/memory mode VFO is an abbreviation of Variable Frequency Oscilla- tor, and is commonly referred to as a main tuning func- tion. The tuning dial is often called the “VFO knob.” ➥ Push [V/M] to switch between VFO and memory modes.

  • Page 34: I Frequency Setting

    BASIC OPERATION I Frequency setting The transceiver has several tuning methods for conve- nient frequency tuning. D D Tuning with the tuning dial 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.
  • Page 35 D D Selecting the 1 Hz step The minimum tuning step of 1 Hz can be used for fine tuning. q Push [TS] momentarily to turn the quick tuning step • “M” disappears. w Push [TS] for 1 sec. to toggle the 1 Hz tuning step ON and OFF.

  • Page 36: I Operating Mode Selection

    SSB (USB/LSB), SSB data (USB data/LSB data), CW, CW reverse (CW-R), RTTY, RTTY-R (RTTY reverse), AM, AM data, FM and FM data modes are available in the IC-746PRO. Select the desired operation mode as follows. To select a mode of operation, push the desired mode switch momentarily.

  • Page 37: I Squelch And Receive (Rf) Sensitivity

    I Squelch and receive (RF) sensitivity Adjusts the RF gain and squelch threshold level. The squelch removes noise output from the speaker (closed position) when no signal is received. • The squelch is particularly effective for FM. It is also avail- able for other modes.

  • Page 38: I Basic Transmit Operation

    BASIC OPERATION I Basic transmit operation Before transmitting, monitor your selected oper- ating frequency to make sure transmitting won’t cause interference to other stations on the same frequency. It’s good Amateur practice to listen first, and then, even if nothing is heard, ask “is the frequency in use”...

  • Page 39: Receive And Transmit

    I Operating SSB q Push a band key to select the desired band. w Push [SSB] to select LSB or USB. • Below 10 MHz LSB is automatically selected; above 10 MHz USB is automatically selected. e Rotate [AF] to set audio to a comfortable listening level.

  • Page 40: I Operating Cw

    RECEIVE AND TRANSMIT I Operating CW q Push a band key to select the desired band. w Push [CW/RTTY] to select CW. • After CW mode is selected, push [CW/RTTY] for 1 sec. to toggle between CW and CW-R modes. e Rotate [AF] to set audio to a comfortable listening level.
  • Page 41 D D About CW reverse mode CW reverse mode receives CW signals with a reverse side CW carrier point like that of LSB and USB modes. Use when interfering signals are near a desired signal and you want to change the interference tone. q Push [CW/RTTY] several times to select CW mode.

  • Page 42: I Electronic Keyer Functions

    RECEIVE AND TRANSMIT I Electronic keyer functions The transceiver has a number of convenient functions for the electronic keyer that can be accessed from the memory keyer menu. q Push [CW/RTTY] to select CW mode. w Push [MENU] to select e Push [F4 ] to select the memory keyer menu.
  • Page 43 D D Memory keyer send menu Pre-set characters can be sent using the keyer send menu. Contents of the memory keyer are set using the edit menu. • Transmitting q While is selected in CW mode, push [F4 to select the memory keyer menu. w Push [F2 ] to select the keyer send menu.
  • Page 44 RECEIVE AND TRANSMIT D D Editing a memory keyer The contents of the memory keyer memories can be set using the memory keyer edit menu. The memory keyer can memorize and re-transmit 4 CW key codes for often-used CW sentences, contact numbers, etc. Total capacity of the memory keyer is 50 characters per memory channel.
  • Page 45 D D Contest number set mode This menu is used to set the contest (serial) number and count up trigger, etc. • Setting contents q Push [MENU] to select , then push [F4 select the memory keyer menu. w Push [F4 ] to enter the contest number set mode.
  • Page 46 RECEIVE AND TRANSMIT D D Keyer set mode This set mode is used to set the CW side tone, mem- ory keyer repeat time, dash weight, paddle specifica- tions, keyer type, etc. • Setting contents q Push [MENU] to select , then push [F4 select the memory keyer menu.
  • Page 47 This item sets the envelop time period which the out- put power becomes the set transmit power. • 2, 4, 6 or 8 msec. can be selected. • About rise time Key action Tx output power This item sets the paddle polarity. •...

  • Page 48: I Operating Rtty (Fsk)

    RECEIVE AND TRANSMIT I Operating RTTY (FSK) Before operating RTTY, be sure to consult the manual that comes with your TNC. q Push a band key to select the desired band. w Push [CW/RTTY] several times to select RTTY. • After RTTY mode is selected, push [CW/RTTY] for 1 sec.

  • Page 49: I Rtty Functions

    I RTTY functions The transceiver has a number of convenient functions for the RTTY operation that can be accessed from the RTTY menu. q Push [CW/RTTY] to select RTTY mode. w Push [MENU] to select e Push [F4 ] to select the RTTY menu. r Push one of the multi-function keys ([F2], [F4] or [F5]) to select an item in the RTTY menu.
  • Page 50 RECEIVE AND TRANSMIT D D RTTY filter/Twin peak filter The transceiver has 5 RTTY filters 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 filter is turned ON, the RTTY tuning meter can be used.
  • Page 51 D D 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- nector (TNC) is not necessary for receiving a Baudot signal.
  • Page 52 RECEIVE AND TRANSMIT D D RTTY set mode This set mode is used to set the mark and shift fre- quencies, keying type, decode USOS function, etc. • Setting contents q Push [MENU] to select , then push [F4 select the RTTY menu. w Push [F5 ] to select RTTY set mode.

  • Page 53: I Operating Am

    I Operating AM q Push a band key to select the desired band. w Push [AM/FM] to select AM. e Rotate [AF] to set audio to a comfortable listening level. r Rotate the tuning dial to tune a desired signal. •...

  • Page 54: I Operating Fm

    RECEIVE AND TRANSMIT I Operating FM q Push a band key to select the desired band. w Push [AM/FM] to select FM. e Rotate [AF] to set audio to a comfortable listening level. r Rotate the tuning dial to tune a desired signal. •...
  • Page 55 D D Tone squelch operation Tone squelch operation is a method of communica- tions using selective calling. Only received signals hav- ing a matching tone will open the squelch. Before communicating using tone squelch, all members of your party must agree on the tone squelch frequency to use.
  • Page 56 RECEIVE AND TRANSMIT D D DTCS operation DTCS function is an another method of communica- tions using selective calling. Only received signals hav- ing a matching 3-digit code will open the squelch. q Push [AM/FM] to select FM mode. w Push [MENU] several times to select e Push [F4 ] several times to turn the DTCS function ON.

  • Page 57: I Repeater Operation

    I 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 58 RECEIVE AND TRANSMIT D D Transmit frequency monitor check You may be able to receive the other party’s transmit signal directly without having to go through a repeater. This function allows you to check this. ➥ While receiving, push and hold [XFC] to see if you can receive the other party’s transmit signal directly.
  • Page 59 D D Auto repeater function This function automatically activates the repeater set- tings (DUP– or DUP+ and/or tone encoder ON/OFF) when the operating frequency falls within the general repeater output frequency range and deactivates them when outside of the range. Set the auto repeater function ON-1 or ON-2 in set mode in advance (p.

  • Page 60: Functions For Receive

    FUNCTIONS FOR RECEIVE I Simple band scope The band scope function allows you to visually check signal conditions around a specified frequency. The IC- 746PRO’s band scope function can be used in any op- erating mode and frequency band. INDICATOR While the band scope is “sweeping,”...

  • Page 61: I Preamp/Attenuator

    I Preamp/Attenuator The preamp amplifies received signals in the front end circuit to improve the S/N ratio and sensitivity. Set this to preamp 1 or preamp 2 when receiving weak signals. The attenuator prevents a desired signal from distor- tion when very strong signals are near the desired fre- quency or when very strong electric fields, such as from broadcasting stations, are near your location.

  • Page 62: I Agc Function

    FUNCTIONS FOR RECEIVE I 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;...

  • Page 63: I If Filter Selection

    I IF filter selection The transceiver has 3 passband width IF filters for each mode. For SSB and CW modes, the passband width can be set within 50 to 3600 Hz in 50 or 100 Hz steps. A total of 41 passband widths are available. For RTTY mode, the passband width can be set within 50 to 2700 Hz in 50 or 100 Hz steps.

  • Page 64: I If (Dsp) Filter Shape

    FUNCTIONS FOR RECEIVE I IF (DSP) filter shape The type of IF (DSP) filter shape for SSB and CW can be selected independently from soft and sharp. q Push [SSB] or [CW/RTTY] to select SSB, CW or RTTY mode. w Select the filter set mode. •...

  • Page 65: I Twin Pbt Operation

    I Twin PBT operation General PBT (Passband Tuning) function electronically narrows the IF passband width by shifting the IF fre- quency to slightly outside of the IF filter passband to reject interference. This transceiver uses the DSP cir- cuit for the PBT function. Moving both [TWIN PBT] controls to the same position shifts the IF.

  • Page 66: I Noise Reduction

    FUNCTIONS FOR RECEIVE I Noise reduction The noise reduction function reduces noise compo- nents and picks out desired signals which are buried in noise. The received signals are converted to digital signals and then the desired signals are separated from the noise. q Push the [NR] switch to turn the noise reduction •...

  • Page 67: I Voice Squelch Control Function

    I Voice squelch control function This function is useful when you don’t want unmodu- lated signals. When the voice squelch control function is activated, the receiver checks received signals for voice components. If a receiver signal includes voice components, and the tone of the voice components changes within 1 sec., squelch opens.

  • Page 68: Functions For Transmit

    FUNCTIONS FOR TRANSMIT I VOX function The VOX (Voice-Operated Transmission) function switches between transmit and receive with your voice. This function provides an opportunity to input log en- tries into your computer, etc., while operating. • Using the VOX function q Select a phone mode (SSB, AM, FM).

  • Page 69: I Break-In Function

    I Break-in function The break-in function is used in CW mode to automat- ically toggle the transceiver between transmit and re- ceive when keying. The IC-746PRO is capable for full break-in or semi break-in. D D Semi break-in operation During semi break-in operation, the transceiver selects transmit when keying, then automatically returns to re- ceive after a pre-set time from when you stop keying.

  • Page 70: I ∂Tx Function

    FUNCTIONS FOR TRANSMIT I ∂ ∂ TX function The ∂TX function shifts the transmit frequency up to ±9.99 kHz in 10 Hz steps without moving the receive frequency. • See #2 on p. 4 for function description. q Push the [∂TX] switch to turn the ∂TX function ON and OFF.

  • Page 71: I Speech Compressor

    I Speech compressor The speech compressor increases average RF output power, improving signal strength and readability in SSB, AM or FM. When adjusting the compression level, it is necessary to turn the COMP meter ON in the set mode, in ad- vance (p.

  • Page 72: I Split Frequency Operation

    FUNCTIONS FOR TRANSMIT I 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 in VFO A and VFO B. The following is an example of setting 21.290 MHz for receiving and 21.310 MHz for transmitting.

  • Page 73: I Quick Split Function

    I Quick split function When you push the [SPLIT] switch for 1 sec., split fre- quency operation is turned ON, the undisplayed VFO is automatically changed according to the plus/minus shift frequency programmed in set mode (p. 83) or equalized when 0 kHz (default value) is programmed as the split shift frequency.

  • Page 74: I Measuring Swr

    FUNCTIONS FOR TRANSMIT I Measuring SWR The IC-746PRO has a built-in circuit for measuring an- tenna SWR— no external equipment or special adjust- ments are necessary. The IC-746PRO can measure SWR in 2 ways— spot measurement and plot measurement are available.

  • Page 75: Memory Operation

    I Memory channels The transceiver has 101 memory channels (plus 1 call channel). The memory 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 Call channel I Memory channel selection D D In VFO mode...

  • Page 76: I Programming A Memory

    MEMORY OPERATION I Programming a memory Memory channel programming can be preformed ei- ther in VFO mode or in memory mode. D D Programming in VFO mode q Set the desired frequency and operating mode in VFO mode. w Rotate [M-CH] to select the desired memory chan- nel.

  • Page 77: I Selecting The Call Channel

    I Selecting the call channel By default 145.00000 MHz/FM is programmed into the call channel. However, this can be changed to suit your operating preference. (see below) q Push [CALL] to select the call channel. • “C” appears. w Push [CALL] again to return to the previous mode. I Programming the call channel The call channel is programmed in the same way reg- ular memory channels are.

  • Page 78: I Frequency Transferring

    MEMORY OPERATION I Frequency transferring The contents of a memory channel (frequency, oper- ating mode, etc.) can be transferred to the VFO. Frequency transferring can be performed in either VFO mode or memory mode. D D Transferring in VFO mode This is useful for transferring programmed contents to VFO.

  • Page 79: I Programming Scan Edges

    I Programming scan edges Memory channels P1 and P2 are the program scan edges. They are used to program an upper and lower frequency for programmed scan (p. 71). By default, P1 is programmed with 0.50000 MHz and P2 is pro- grammed with 29.99999 MHz.

  • Page 80: I Assigning Memory Names

    MEMORY OPERATION I Assigning memory names All memory channels (including scan edges) can be tagged with alphanumeric names of up to 9 characters each. [EXAMPLE]: Programming “DX spot” into memory channel 99. q Push [V/M] to select memory mode, if necessary. w Rotate [M-CH] to select memory channel 99.

  • Page 81: I Memo Pads

    I 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.

  • Page 82: Scans

    SCANS I 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. Mch 2 Mch 3 Mch 1...

  • Page 83: I Voice Squelch Control Function

    I Voice squelch control function This function is useful when you don’t want unmodu- lated signals pausing or cancelling a scan. When the voice squelch control function is activated, the receiver checks received signals for voice components. If a receiver signal includes voice components, and the tone of the voice components changes within 1 sec., scan pauses (or stops).

  • Page 84: I Programmed Scan/Fine Programmed Scan

    SCANS I Programmed scan/Fine programmed scan (VFO mode) Programmed scan searches for signals between scan edge memory channels P1 and P2. The default fre- quencies for these memories are 0.500000 MHz and 29.99999 MHz, respectively. See p. 66 for scan edges programming.

  • Page 85: I Memory Scan Operation

    I Memory scan operation (Memory mode) Memory scan searches through memory channel 1 to 99 for signals. Blank (unprogrammed) memory chan- nels are skipped. q Push [V/M] to select memory mode, if necessary. w Push [MENU] to select e Push [F1 ] to select the scan menu.

  • Page 86: I ∂F Scan Operation And Fine ∂F Scan

    SCANS I ∂ ∂ F scan operation and Fine ∂F scan ∂F scan searches for signals within the specified range with the displayed VFO or memory channel fre- quency as for center frequency. The frequency range is specified by the span. q Push [V/M] to select VFO mode or memory mode, as desired.

  • Page 87: I Tone Scan/Dtcs Code Scan Operation

    I Tone scan/DTCS code scan operation By monitoring a signal that is being operated with a re- peater, tone squelch or DTCS, you can determine the tone frequency necessary to open a repeater or the squelch. q Push [AM/FM] to select FM mode. w Push [MENU] several times to select e Push [F4 ] for 1 sec.

  • Page 88: Antenna Tuner Operation

    ANTENNA TUNER OPERATION I Antenna connection and selection The IC-746PRO has 2 antenna connectors for the HF/50 MHz bands, [ANT1] and [ANT2], and 1 antenna connector for the 144 MHz band; a total of 3 antenna connectors. For each operating band the IC-746PRO covers, there is a band memory which can memorize a selected an- tenna.

  • Page 89: I Antenna Tuner Operation

    I 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 capacitors are automatically preset to the memorized point.

  • Page 90: I Optional External Tuner Operation

    I Optional external tuner operation D D AH-4 HF/50 MHz AUTOMATIC ANTENNA TUNER The AH-4 matches the IC-746PRO to a long wire an- tenna more than 7 m/23 ft long (3.5 MHz and above). • See the AH-4 instruction manual for AH-4 installation and antenna connection details.

  • Page 91: Data Communication

    I Connections I When connecting to [DATA] • When using a PC application q DATA IN w GND r DATA OUT (9600 bps) y P SQL* t AF OUT (1200 bps) e PTT P • When using a TNC q DATA IN w GND r DATA OUT (9600 bps) y P SQL*...

  • Page 92: I Packet (Afsk) Operation

    DATA COMMUNICATION I Packet (AFSK) operation Before operating packet (AFSK) be sure to consult the operating manual that came with your TNC. q Connect a TNC and PC. (p. 78) w Push a band key to select an operating band. e Push [SSB] or [AM/FM] to select the desired operat- ing mode.

  • Page 93: I Adjusting The Tnc Output Level

    I Adjusting the TNC output level When setting data transmission speed to 9600 bps, the data signal coming from the TNC is applied exclu- sively to the internal limiter circuitry to automatically maintain band width. NEVER apply data levels from the TNC of over 0.6 V p-p, otherwise the transceiver will not be able to main- tain the band width and may possibly interfere with other stations.

  • Page 94: Set Mode

    SET MODE I General set mode D D Entering set mode Set mode is used for programming infrequently changed values or conditions of functions. • Set mode operation q Push [MENU] several times to select the function menu indication, if necessary. w Push [MENU] for 1 sec.
  • Page 95 I General set mode (continued) A beep sounds each time a switch is pushed to con- firm it. This function can be turned OFF for silent op- eration. Confirmation beep ON (default) Confirmation beep OFF The volume level can be set in 3. (p.
  • Page 96 SET MODE I General set mode (continued) When this item is set to ON, pushing [SPLIT] for 1 sec. sets the transmit frequency using the displayed frequency and the split offset, set in item below, and activates the split function au- tomatically.
  • Page 97 I General set mode (continued) This item turns the one touch repeater function ON ) and OFF. When [F2 ] is pushed for 1 sec. in lected offset direction and the programmed duplex offset frequency (depending on the operating fre- quency band) is set with the displayed frequency.
  • Page 98 SET MODE I General set mode (continued) You can set the antenna connector selection to auto- matic, manual or non-selection (when using 1 an- tenna only for the HF/50 MHz bands). : The antenna switch is activated and the band memory memorizes the se- lected antenna.
  • Page 99 I General set mode (continued) 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).
  • Page 100 SET MODE I General set mode (continued) This item selects the displayed frequency shift func- tion from ON and OFF. When this function is activated, the receiving signal can be kept in receive even when the operating mode is changed between SSB and CW. : The displayed frequency shifts when the operating mode is changed be- tween SSB and CW.
  • Page 101 To distinguish equipment, each CI-V transceiver has its own Icom standard address in hexadecimal code. The IC-746PRO’s address is 66h. When 2 or more IC-746PRO’s are connected to an optional CT-17 V LEVEL CONVERTER ing dial to select a different address for each IC- 746PRO in the range 01h to 7Fh.

  • Page 102: I Tone Control Set Mode

    SET MODE I Tone control set mode D D Entering tone control set mode Tone levels (bass and treble) for each transmit and re- ceive audio can be set for each phone mode indepen- dently. • Set mode operation q Push [MENU] several times to select w Push [F4 ] to select the tone control set mode.

  • Page 103: Option Installation

    I 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.

  • Page 104: High Stability Crystal Unit

    OPTION INSTALLATION I CR-338 HIGH STABILITY CRYSTAL UNIT By installing the CR-338, the total frequency stability of the transceiver will be improved. q Remove the bottom covers as shown on the previ- ous page. w Remove the 4 screws from the shield cover of the RF unit, and disconnect P2 (CHASSIS) from J761 (MAIN), then lift up the shield cover.

  • Page 105: Maintenance

    MAINTENANCE 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. POSSIBLE CAUSE • Re-connect the DC power cable correctly. • Check for the cause, then replace the fuse with the spare one.

  • Page 106: I Fuse Replacement

    D D Circuitry fuse replacement The 13.8 V DC from the DC power cable is applied to all units in the IC-746PRO, except for the power am- plifier, through the circuitry fuse. This fuse is installed in the PA unit.

  • Page 107: I Resetting The Cpu

    I Resetting the CPU When first applying power or when the function does not seem to be operating normally, reset the CPU as follows: q Make sure the transceiver power is OFF. w While pushing [M-CL] and [F-INP], push [POWER] for 1 sec.

  • Page 108: Control Command

    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 to a personal computer equipped with an RS-232C port. See p. 88 for setting the CI-V condition using set mode.
  • Page 109 • Command table (continued) Command Sub command 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) Set as non-select channel Set as select channel Set scan resume OFF Set scan resume ON Turn the split function OFF Turn the split function ON Select simplex operation...
  • Page 110 CONTROL COMMAND • Command table (continued) Command Sub command 0517 Send/read one touch repeater set (0=DUP–, 1=DUP+) 0518 Send/read auto repeater set (0=OFF, 1=ON-1, 2=ON-2) 0519 Send/read tuner auto start set (0=OFF, 1=ON) 0520 Send/read PTT tune set (0=OFF, 1=ON) 0521 Send/read 9600 bps mode set (0=OFF, 1=ON)
  • Page 111 • Command table (continued) Command Sub command 0577 Send/read MONITOR level (0=0% to 255=100%) Send/read DATA mode (0=OFF, 1=ON) Send/read SSB transmit band- width (0=WIDE, 1=MID, 2=NAR) Send/read DSP filter shape (0= sharp, 1= soft) Set/read repeater tone frequency (see p. 98 for details) Set/read TSQL tone frequency (see p.
  • Page 112 CONTROL COMMAND D D Split/Duplex frequency setting The following data sequence is used when sending/reading the split or duplex frequency setting. *No need to enter for duplex frequency setting. D D Repeater tone/tone squelch frequency setting The following data sequence is used when sending/reading the DTCS code and polarity setting.

  • Page 113: Specifications

    • General • Frequency coverage Receive 0.030– 108.000– 174.000000* Transmit 1.800– 3.500– 7.000– 10.100– 14.000– 18.068– 21.000– 24.890– 28.000– 50.000– 144.000– 148.000000 *Some frequency ranges are not guaranteed. • Mode : USB, LSB, CW, RTTY, AM, FM • No. of memory ch. : 102 (99 regular, 2 scan edges and 1 call)

  • Page 114: Options

    OPTIONS IC-PW1 HF/50 MHz ALL BAND 1 kW LINEAR AMPLIFIER Full-duty 1 kW linear amplifier including an automatic antenna tuner. Has automatic tuning and band selection capability. Full break-in (QSK) oper- ation is possible. The amplifier/power supply unit and the remote control unit are separated.
  • Page 116 A-6085H-1US-w Printed in Japan 1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003 Japan © 2001, 2002 Icom Inc.

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