Icom IC-7400 Instruction Manual
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Icom IC-7400 Instruction Manual

Hf/vhf all mode transceiver
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INSTRUCTION MANUAL
HF/VHF
ALL MODE TRANSCEIVER
i7400

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Summary of Contents for Icom IC-7400

  • Page 1 INSTRUCTION MANUAL HF/VHF ALL MODE TRANSCEIVER i7400...

  • Page 2: Important

    This may result in an electrical shock or burn. ple of moments of your time to thank you for making R NEVER the IC-7400 your radio of choice, and hope you agree apply AC to the [DC13.8V] jack on the trans- with Icom’s philosophy of “technology first”.Many hours ceiver rear panel.

  • Page 3: Table Of Contents

    *The illustration shows OPC-025D. However, OPC-639 is supplied with versions, which “CE” symbol on the serial number. 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.

  • Page 4: Quick Reference Guide

    13.8 V DC. priate color coded terminals, then insert the DC con- nector into the DC jack located on the rear of the The perfect match to your IC-7400 is the PS-125. This radio. (The diagram below describes the connection with compact switching power supply is the matching OPC-639.
  • Page 5 There are three connections on range and SWR may be increased out-of-range. the back of your IC-7400, two for HF and 6 m and one When the SWR is higher than approx. 2.0:1, the for 2 m. If you are using one antenna for HF and 6 m, transceiver’s power drops to protect the final tran-...

  • Page 6: I Operation

    If you do not see the particular item you are wanting the time to connect this gear! We will cover the basic to connect, refer to the Advance Connections section devices that can be connected to your IC-7400. starting on page 15. I Operation 1.

  • Page 7: I Your First Contact

    HEADPHONES SP-21 (optional) I Your first contact Now you should have your IC-7400 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 1. Select the desired band • Say you want to go to 20 meters or 14 MHz; you On your IC-7400, an easy way of changing bands is would push the [14 5]. This will immediately change by using the keypad located just above the tuning the displayed operating frequency to the 20-meter knob on the right hand side of the display.
  • Page 9 Increases a. Noise Reduction: The noise reduction system on your IC-7400 is part of the 32-bit DSP. This is used to reduce the hiss and QRM levels. To activate, push the [NR] switch located just to the right of the Noise reduction ON [PHONES] jack.
  • Page 10 AGC from the interfering signal. Low frequency High frequency d. Filters: Your IC-7400 has an incredible IF DSP based filter network with over 100 settings. • Dial in your filters: By pushing [FILTER] for 1 sec., • Filter set mode indication you enter the filter set mode.
  • Page 11 QUICK REFERENCE GUIDE d. Filters:— continued PBT operation example • On the fly adjustment: Once the adjustments have [TWIN PBT] control been made in the filter set mode, you can make on the fly changes by using the Twin Pass Band Tuning, Twin PBT.

  • Page 12: I Ready To Call Cq

    [CW PITCH]: 12 o’clock [KEY SPEED]: Max. CCW 1. Setting up your transmit audio The 32-bit DSP in your IC-7400 is capable of allowing you to selects transmit audio for phone modes. 2. Mic Gain The microphone gain is used for proper transmit...
  • Page 13 QUICK REFERENCE GUIDE 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 menu.

  • Page 14: Panel Description

    PANEL DESCRIPTION I Front panel !3 !2 i7400 HF/VHF TRANSCEIVER TUNER POWER F-INP NOTCH TRANSMIT SPLIT 144 ENT GENE A /B PHONES MP - W MP - R /NOTCH LOCK ELEC-KEY RF/SQL MENU CW/RTTY AM/FM FILTER LOCK/ CALL MIC GAIN RF PWR CW PITCH KEY SPEED...
  • Page 15 !5 NOISE REDUCTION LEVEL CONTROL [NR] Recommended level for (inner control; p. 52) an Icom microphone Adjusts the noise reduction level when the noise re- duction is in use. Set for maximum readability. Decreases Increases...
  • Page 16 PANEL DESCRIPTION I Front panel (continued) i746PRO TWIN PBT HF/VHF TRANSCEIVER TUNER F-INP NOTCH SPLIT PBTC 144 ENT GENE A /B V / M M-CL M-CH MP - W MP - R /NOTCH LOCK RF/SQL ∂TX CLEAR RIT/∂TX MENU CW/RTTY AM/FM FILTER LOCK/...
  • Page 17 PANEL DESCRIPTION @3 VOX/BREAK-IN SWITCH [VOX/BK-IN] #0 RIT SWITCH [RIT] (p. 47) ➥ In SSB, AM and FM modes, push momentarily to ➥ Turns the RIT function ON and OFF when pushed. turn the VOX function ON and OFF (p. 54); push •...
  • Page 18 PANEL DESCRIPTION I Front panel (continued) %0 $9 $8 i746PRO TWIN PBT HF/VHF TRANSCEIVER F-INP NOTCH SPLIT PBTC 144 ENT GENE A /B V / M M-CL M-CH MP - W MP - R /NOTCH LOCK RF/SQL ∂TX CLEAR RIT/∂TX MENU CW/RTTY AM/FM...
  • Page 19 (p. 19) • The offset frequency is shifted from the displayed fre- quency. • Icom’s triple band stacking register memorizes 3 fre- • The quick split function can be turned OFF using set quencies in each band. ➥ After pushing [F-INP], enter a keyed frequency.

  • Page 20: I Rear Panel

    Accepts 13.8 V DC through the supplied DC power o ALC INPUT JACK [ALC] (p. 17) cable (OPC-025D). 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

    PANEL DESCRIPTION D DATA SOCKET DATA PIN No. NAME DESCRIPTION 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 ⁄ TUNING DIAL SPEED INDICATOR (p. 21) Shows the operating frequency. Appears when the tuning dial speed is set so that one rotation is equal to ⁄ of the normal rotation. w MULTI-FUNCTION METER INDICATION ➥...
  • Page 23 PANEL DESCRIPTION I LCD display (continued) !5 BREAK-IN INDICATORS (p. 55) @4 NOISE REDUCTION INDICATOR (p. 52) ➥ “F BK-IN” appears when the full break-in function Appears when the noise reduction is activated. is activated. @5 NOTCH INDICATORS (p. 52) ➥...

  • Page 24: I Multi Function Switches

    PANEL DESCRIPTION I Multi function switches M1 FUNCTIONS ⁄ TUNING FUNCTION (p. 21) During SSB operation Push to turn the ⁄ tuning function ON/OFF. • “ ” indicator appears when the ⁄ tuning function is ON. TRANSMISSION BANDWIDTH (p. 57) During SSB data operation Push to select the transmission bandwidth.

  • Page 25: I Microphone (Hm-36)

    DO NOT short pin 2 to ground as this can damage the internal 8 V regulator. NOTE: DC voltage is applied to pin 1 for micro- phone operation. Take care when using a non-Icom microphone. • HM-36 SCHEMATIC DIAGRAM MICROPHONE MICROPHONE CABLE MICROPHONE PLUG 10µ...

  • Page 26: Installation And Connections

    R WARNING: NEVER power for transmitting even when using the antenna connect the [GND] tuner. The IC-7400 has an SWR meter to monitor terminal to a gas or electric pipe, since the connec- the antenna SWR continuously. tion could cause an explosion or electric shock.

  • Page 27: I Required Connections

    INSTALLATION AND CONNECTIONS I Required connections • Front panel i7400 TWIN PBT CW KEY HF/VHF TRANSCEIVER TUNER POWER F-INP NOTCH TRANSMIT SPLIT PBTC GENE 144 ENT M-CL PHONES M-CH MP-W MP-R A/NOTCH ELEC-KEY RF/SQL ∂TX CLEAR (dot) (com) RIT/∂TX (dash) MENU CW/RTTY AM/FM...

  • Page 28: I Advanced Connections

    When using the AH-4, it must be connected to the [ANT1] connector. [SEND], [ALC] (p. 17) Used for connecting a non-Icom linear ampli- fier. [DATA] (p. 77) ACC SOCKETS (pgs. 8, 77) [REMOTE] (p. 94) Used for computer control and transceive operation.

  • Page 29: I Power Supply Connections

    • The [POWER] switch is OFF. power. Refer to the diagrams below. • Output voltage of the power source is 12–15 V when you use a non-Icom power supply. • DC power cable polarity is correct. : positive + terminal...

  • Page 30: I Linear Amplifier Connections (Not Usable In European Countries)

    (Non-European versions: 100—120/220—240 V European version : 230 V) Turn OFF the transceiver’s antenna tuner while tuning the IC-PW1’s tuner. CONNECTING A NON-ICOM LINEAR AMPLIFIER R WARNING: 50 Ω coaxial cable Set the transceiver output power and linear ampli- To an fier ALC output level referring to the linear amplifier...

  • Page 31: Basic Operation

    BASIC OPERATION I When first applying power (CPU resetting) 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. Band keys 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

    BASIC OPERATION I Selecting VFO/memory mode VFO is an abbreviation of Variable Frequency Oscilla- [V/M] 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 Band keys 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 BASIC OPERATION 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-7400. Select the desired operation mode as fol- lows. To select a mode of operation, push the desired mode switch momentarily.

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

    BASIC OPERATION I Squelch and receive (RF) sensitivity Adjusts the RF gain and squelch threshold level. The [RF/SQL] control 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

    RECEIVE AND TRANSMIT I Operating SSB [TRANSMIT] [TX] indicator Band keys 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 [TRANSMIT] [TX] indicator Band keys 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 RECEIVE AND TRANSMIT 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. Push for 1 sec. Use when interfering signals are near a desired signal and you want to change the interference tone.

  • 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 RECEIVE AND TRANSMIT 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.
  • 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 RECEIVE AND TRANSMIT 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 ] to 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 ] to select the memory keyer menu.
  • Page 47 RECEIVE AND TRANSMIT 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 Set Tx power level Tx output power Time 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. [TRANSMIT] [TX] indicator Band keys w Push [CW/RTTY] several times to select RTTY. •...

  • Page 49: I Rtty Functions

    RECEIVE AND TRANSMIT 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.
  • 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 RECEIVE AND TRANSMIT 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 ] to select the RTTY menu.

  • Page 53: I Operating Am

    RECEIVE AND TRANSMIT I Operating AM [TRANSMIT] [TX] indicator Band keys 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 [TRANSMIT] [TX] indicator Band keys 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 RECEIVE AND TRANSMIT 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

    RECEIVE AND TRANSMIT 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

    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: 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- 7400’s band scope function can be used in any oper- ating mode and frequency band. Sweep indicator Band scope indicator Frequency indicator mark Sweep step indicator...

  • Page 60: I Preamp/Attenuator

    FUNCTIONS FOR RECEIVE 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 61: 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 62: I If Filter Selection

    FUNCTIONS FOR RECEIVE 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.

  • Page 63: 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 64: I Twin Pbt Operation

    FUNCTIONS FOR RECEIVE I Twin PBT operation General PBT (Passband Tuning) function electronically [TWIN PBT] control 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.

  • Page 65: 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 66: I Voice Squelch Control Function

    FUNCTIONS FOR RECEIVE I Voice squelch control function This function is useful when you don’t want unmodu- VSC indicator 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 67: 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 68: 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-7400 is capable for full break-in or semi break-in. [VOX/BK-IN] D D Semi break-in operation...

  • Page 69: I ∂Tx Function

    FUNCTIONS FOR TRANSMIT I ∂ ∂ TX function The ∂TX function shifts the transmit frequency up to [CLEAR] ±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 70: I Speech Compressor

    FUNCTIONS FOR TRANSMIT 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 71: I Split Frequency Operation

    FUNCTIONS FOR TRANSMIT I Split frequency operation Split frequency operation allows you to transmit and [SPLIT] Lights during split operation 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 72: I Quick Split Function

    FUNCTIONS FOR TRANSMIT I Quick split function When you push the [SPLIT] switch for 1 sec., split fre- • Setting the frequency while pushing [XFC] quency operation is turned ON, the undisplayed VFO is automatically changed according to the plus/minus shift frequency programmed in set mode (p.

  • Page 73: I Measuring Swr

    FUNCTIONS FOR TRANSMIT I Measuring SWR The IC-7400 has a built-in circuit for measuring an- tenna SWR— no external equipment or special adjust- ments are necessary. The IC-7400 can measure SWR in 2 ways— spot measurement and plot measurement are available.

  • Page 74: Memory Operation

    MEMORY OPERATION I Memory channels The transceiver has 101 memory channels (plus 1 call All 101 memory channels are tuneable which means channel). The memory mode is very useful for quickly the programmed frequency can be tuned temporarily changing to often-used frequencies. with the tuning dial, etc.

  • Page 75: I Programming A Memory

    MEMORY OPERATION I Programming a memory Memory channel programming can be preformed ei- [MW] 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 76: I Selecting The Call Channel

    MEMORY OPERATION 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.

  • Page 77: 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 [V/M] [M-CH] VFO.

  • Page 78: I Programming Scan Edges

    MEMORY OPERATION I Programming scan edges Memory channels P1 and P2 are the program scan [V/M] [MW] edges. They are used to program an upper and lower frequency for programmed scan (p. 70). By default, P1 is programmed with 0.50000 MHz and P2 is pro- grammed with 29.99999 MHz.

  • Page 79: I Assigning Memory Names

    MEMORY OPERATION I Assigning memory names All memory channels (including scan edges) can be [V/M] 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 80: I Memo Pads

    MEMORY OPERATION 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 81: Scans

    SCANS I Scan types PROGRAMMED SCAN ∂F SCAN Repeatedly scans between two scan edge frequencies Repeatedly scans within ∂F span area. (scan edge memory channels P1 and P2). Start frequency Scan edge Scan edge ∂F frequency P1 or P2 P2 or P1 +∂F frequency –...

  • Page 82: I Voice Squelch Control Function

    SCANS 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. VSC indicator If a receiver signal includes voice components, and the tone of the voice components changes within 1 sec., scan pauses (or stops).

  • Page 83: I Programmed Scan/Fine Programmed Scan

    SCANS I Programmed scan/Fine programmed scan (VFO mode) Programmed scan searches for signals between scan [TS] [V/M] edge memory channels P1 and P2. The default fre- quencies for these memories are 0.500000 MHz and 29.99999 MHz, respectively. See p. 65 for scan edges programming.

  • Page 84: I Memory Scan Operation

    SCANS 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 85: 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 Keypad [V/M] 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 86: I Tone Scan/Dtcs Code Scan Operation

    SCANS 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. Push [F4] for 1 sec.

  • Page 87: Antenna Tuner Operation

    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-7400 covers, there is a band memory which can memorize a selected an- tenna. When you change the operating frequency be- yond a band, the previously used antenna is automat- ically selected (see below) for the new band.

  • Page 88: I Antenna Tuner Operation

    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 89: I Optional External Tuner Operation

    I Optional external tuner operation D D AH-4 HF/50 MHz AUTOMATIC ANTENNA TUNER AH-4 setting example: The AH-4 matches the IC-7400 to a long wire antenna more than 7 m/23 ft long (3.5 MHz and above). For mobile operation • See the AH-4 instruction manual for AH-4 installation and Optional AH-2b antenna connection details.

  • Page 90: Data Communication

    DATA COMMUNICATION I Connections I When connecting to [DATA] • When using a PC application q DATA IN TX AUDIO w GND Connect to serial port, parallel port, speaker jack, microphone r DATA OUT (9600 bps) RX AUDIO jack and line IN/OUT jack, etc. y P SQL* See the instruction manual of the application for details.

  • Page 91: I Packet (Afsk) Operation

    DATA COMMUNICATION I Packet (AFSK) operation Before operating packet (AFSK) be sure to consult the [TRANSMIT] [TX] indicator Band keys operating manual that came with your TNC. q Connect a TNC and PC. (p. 77) w Push a band key to select an operating band. e Push [SSB] or [AM/FM] to select the desired operat- ing mode.

  • Page 92: I Adjusting The Tnc Output Level

    DATA COMMUNICATION 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 93: 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. [F1 ≤] [F2 ≥] • Set mode operation q Push [MENU] several times to select the function menu indication, if necessary.
  • Page 94 SET MODE 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 95 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 96 SET MODE I General set mode (continued) This item turns the one touch repeater function ON ) and OFF. When [F2 ] is pushed for 1 sec. in , the se- lected offset direction and the programmed duplex offset frequency (depending on the operating fre- quency band) is set with the displayed frequency.
  • Page 97 SET MODE I General set mode (continued) When the optional UT-102 VOICE SYNTHESIZER UNIT installed, you can select between English and Japan- ese as the language. : Announces in English (default) : Announces in Japanese See p. 89 for unit installation. When the optional UT-102 VOICE SYNTHESIZER UNIT installed, you can select between faster or slower...
  • Page 98 SET MODE 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 99 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 100 To distinguish equipment, each CI-V transceiver has its own Icom standard address in hexadecimal code. The IC-7400’s address is 66h. When 2 or more IC-7400’s are connected to an op- tional CT-17 , rotate the tuning V LEVEL CONVERTER dial to select a different address for each IC-7400 in the range 01h to 7Fh.

  • Page 101: 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. [F1 ≤] [F2 ≥] [F4 •...

  • Page 102: Option Installation

    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 103: 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 cover as shown on the previ- Shield cover ous page. (CHASSIS) 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 104: Maintenance

    The following chart is designed to help you correct If you are unable to locate the cause of a problem or problems which are not equipment malfunctions. solve it through the use of this chart, contact your near- est Icom Dealer or Service Center. PROBLEM POSSIBLE CAUSE SOLUTION REF.

  • Page 105: I Fuse Replacement

    find the source of the problem, and replace the dam- from the transceiver when changing a fuse. aged fuse with a new, rated fuse. The IC-7400 has 2 types of fuses installed for trans- ceiver protection. • DC power cable fuses ........ FGB 30 A •...

  • Page 106: I Resetting The Cpu

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

  • Page 107: Control Command

    RS-232C port. The Icom Communi- cations Interface-V (CI-V) controls the following func- tions of the transceiver. personal Up to 4 Icom CI-V transceivers or transceivers can be computer connected to a personal computer equipped with an ct- 17 RS-232C port.
  • Page 108 CONTROL COMMAND • Command table (continued) Command Sub command Description Command Sub command Description AGC selection (0=OFF; 1=Slow; A1–A7 Set ∂F scan span (A1=±5 kHz, 2=Mid; 3=Fast) A2=±10 kHz, A3=±20 kHz, A4=±50 kHz, A5=±100 kHz, Noise blanker (0=OFF; 1=ON) A6=±500 kHz, A7=±1 MHz) Noise reduction (0=OFF;...
  • Page 109 CONTROL COMMAND • Command table (continued) Command Sub command Description Command Sub command Description 0517 Send/read one touch repeater set 0548 Send/read FM TX Tone (Treble) (0=DUP–, 1=DUP+) level (0=–5 to 10=+5) 0518 Send/read auto repeater set 0549 Send/read FM RX Tone (Bass) (0=OFF, 1=ON-1, 2=ON-2) level (0 =–5 to 10=+5) 0519...
  • Page 110 CONTROL COMMAND D D Codes for memory keyer contents • Command table (continued) To send or read the desired memory keyer contents, the Command Sub command Description channel and character codes as follows are used. 0577 Send/read MONITOR level (0=0% •...

  • Page 111: Control Command

    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 112: Specifications

    SPECIFICATIONS • General • Receiver • Receive system : Triple conversion • Frequency coverage (Unit: MHz) superheterodyne system Receive 0.030– 60.000000* • Intermediate frequencies: 144.000– 146.000000 64.455 MHz Transmit 1.800– 1.999999* 455 kHz 3.500– 3.999999* 36 kHz 7.000– 7.300000* • Sensitivity 10.100–...

  • Page 113: Options

    [UP]/[DOWN] switches. •About DC power supply •About IC-PW1 LINEAR AMPLIFIER The use of IC-7400 (#03, #04, #05, #08, #09) in combina- The IC-PW1 does not comply with Euro- LINEAR AMPLIFIER tion with the DC power supply complies with European Har- pean Harmonised Standard regulations.

  • Page 114: About Ce

    Fur- Versions of the IC-7400 which display the ther information can be found at http://www.arrl.org/. “CE” symbol on the serial number seal, comply with the essential requirements of •...

  • Page 115: About Ce

    ABOUT CE DECLARATION OF CONFORMITY We Icom Inc. Japan 1-1-32, Kamiminami, Hirano-ku Osaka 547-0003, Japan Declare on our sole responsibility that this equipment complies with the essential requirements of the Radio and Telecommunications Terminal Equipment Directive, 1999/5/EC, and that any applicable Essential Test Düsseldorf 25th Jan.
  • Page 116 ESP I DEN IC-7400 <Intended Country of Use> #08 (Italy) NED I ITA IC-7400 <Intended Country of Use> #09 (Spain) IRL I ESP FRA I POR A-6086H-1EX-q Printed in Japan 1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003 Japan © 2002 Icom Inc.

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