2001 NEW IC-7400.qxd 02.4.
001 NEW 2001 NEW IC-7400.qxd 02.4.2 11:34 Page 2 FOREWORD PRECAUTIONS We understand that you have a choice of many different radios in the market place. We want to take a couple of moments of your time to thank you for making the IC-7400 your radio of choice, and hope you agree with Icom’s philosophy of “technology first”.Many hours of research and development went into the design of your IC-7400. R WARNING HIGH VOLTAGE! NEVER attach an antenna or internal antenna connector during transmission.
2001 NEW IC-7400.qxd 02.4.2 11:34 Page 3 TABLE OF CONTENTS FOREWORD ..................................... i IMPORTANT ..................................... i EXPLICIT DEFINITIONS .................. i PRECAUTIONS ................................ i TABLE OF CONTENTS ................... ii QUICK REFERENCE GUIDE ..... I – X ■ Installation ....................................... I ■ Operation ....................................... III ■ Your first contact ........................... IV ■ Ready to call CQ? ..
2001 NEW IC-7400.qxd 02.4.2 11:35 Page I QUICK REFERENCE GUIDE ■ Installation 1. Install a ground system for DC noise suppression and RFI suppression 2. Install your DC power supply 3. Install lightning protection. This will help protect more than your gear. 4. Install and connect an antenna system for the appropriate bands of operation 5. Connect other peripheral equipment. This includes microphones, headsets, TNC, amplifiers and any other equipment necessary to make your shack complete. 1.
IC-7400.qxd 02.4.2 11:35 Page II QUICK REFERENCE GUIDE 3. Installing lightning protection Although you may not live in an area with high occurrence for lightning storms, it is always wise to take precautions for lightning or static discharges. Proper lightning protection not only offers protection to the ham gear, but the shack and most importantly the operator. NOTE: There are many publications covering proper lightning protection, check with your local dealer for more information and recommendations.
2001 NEW IC-7400.qxd 2001 NEW 02.4.2 11:35 Page III QUICK REFERENCE GUIDE 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-7400. If you do not see the particular item you are wanting to connect, refer to the Advance Connections section starting on page 15. ■ Operation 1. Voice Microphones: Connect the microphone to the eightpin connector on the front of the radio.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page IV QUICK REFERENCE GUIDE 3. Other convenient items Headphones: A 6.35(d) mm (1⁄4″) mono jack for operation without using the internal or external speakers. Perfect for operation without disturbing others in the room. HEADPHONES External Speaker: A 3.5(d) mm (1⁄8″) mono jack for operation with an external speaker. (Input impedance: 8 Ω/Max.
2001 NEW IC-7400.qxd 2001 NEW 02.4.2 11:35 Page V QUICK REFERENCE GUIDE D Just listening 1. Select the desired band On your IC-7400, 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 notice each switch has two sets of numbers; one set of numbers represents the band selection. • Say you want to go to 20 meters or 14 MHz; you would push the [14 5].
2001 NEW IC-7400.qxd 02.4.2 11:35 Page VI QUICK REFERENCE GUIDE D What are you hearing? Stop and focus on what you are hearing. Do you hear a lot of noise? Is the signal intelligible? Are you set up for the right mode? How about the filters? 1. Verify mode Although your IC-7400 will automatically select USB or LSB in the HF bands, it will not select any of the other modes. You will need to select the proper mode whether CW, RTTY, AM or FM.
2001 NEW 2001 NEW IC-7400.qxd 02.4.2 11:35 Page VII QUICK REFERENCE GUIDE c. Notch: There are two notch systems on your IC746PRO. • Automatic: The automatic notch will track up to three heterodynes. This is helpful for eliminating annoying transmitter “tune up” tones on any band, and to minimize continuous tone “heterodynes” encountered on the 40 meter phone bands at night, for example. Once selected an icon will appear “A NOTCH” on the display.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page VIII QUICK REFERENCE GUIDE 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. PBT operation example [TWIN PBT] control [PBTC] AGC One of “1,” “2” or “3” is displayed for selected filter number indications.
2001 NEW 2001 NEW IC-7400.qxd 02.4.2 11:35 Page IX QUICK REFERENCE GUIDE 3. RX Tone Control: [F1 ≤] [F2 ≥] [F4 TCN] Once you have mastered your filter settings, one last feature to enable the most intelligible audio is the actual audio tone you hear. You can adjust the equalization of your received audio ±5dB. q Push [MENU] several times, or until M2 is shown on the display. w Push [F4 TCN] for the Tone Control set mode. e Push the appropriate mode switch to adjust SSB, AM or FM.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page X 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 TBW]. You will find this located in the M1 menu. By pushing [F4 TBW] for 1 sec. you can select the TX audio band pass. There are three levels of audio passband width available (Wide, Mid, and Nar). TX Audio Passband widths Wide : 2.
2001 NEW IC-7400.qxd 02.4.2 11:35 1 Page 1 PANEL DESCRIPTION ■ Front panel !7 !6 !5 !4 !3 !2 i7400 q TUNER 1.8 1 3.
IC-7400.qxd 02.4.2 11:35 Page 2 PANEL DESCRIPTION • When functioning as RF gain control (Squelch is fixed open; SSB, CW, RTTY only) Maximum RF gain Adjustable range 1 !0 CW PITCH CONTROL [CW PITCH] (p. 28) Shifts the received CW audio pitch and monitored CW audio pitch without changing the operating frequency. • The pitch can be changed from 300 to 900 Hz in approx. 25 Hz steps. Decreases Increases CW PITCH Minimum RF gain • When functioning as squelch control (RF gain is fixed at maximum.
2001 NEW 2001 NEW IC-7400.qxd 02.4.2 11:35 1 Page 3 PANEL DESCRIPTION ■ Front panel (continued) i746PRO TUNER TWIN PBT HF/VHF TRANSCEIVER ANT 1.8 1 3.5 2 7 10 4 14 5 18 6 21 7 24 8 28 9 3 F-INP NR NOTCH T SPLIT PBTC 50 0 GENE 144 ENT MW A /B V/M MP-W Y TX A/NOTCH NR AF M-CL M-CH TS MP-R RX #3 LOCK XFC RF/SQL ∂TX RIT RIT/∂TX MIC GAIN RF PWR F1 F2 F3 F4 F5 MENU SSB CW/RTTY AM/FM FILTER CW PITCH !8 KEY SPEED !9 @0 P.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 4 PANEL DESCRIPTION @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. 54); push for 1 sec. to enter VOX set mode (p. 54). ➥ In CW mode, push momentarily to turn the semi break-in, full break-in or break-in OFF (p. 55); push for 1 sec. to enter break-in set mode (p. 55).
2001 NEW 2001 NEW IC-7400.qxd 02.4.2 11:35 1 Page 5 PANEL DESCRIPTION ■ Front panel (continued) %1 %2 i746PRO NER %0 $9 $8 TWIN PBT HF/VHF TRANSCEIVER ANT 1.8 1 3.5 2 7 10 4 14 5 18 6 21 7 24 8 28 9 SPLIT GENE 50 0 144 ENT A /B 3 F-INP NR NOTCH $7 PBTC MW V/M MP-W NR AF TX A/NOTCH XFC M-CL RX LOCK RF/SQL RIT ∂TX RIT/∂TX MIC GAIN RF PWR F1 F2 F3 F4 F5 MENU SSB CW/RTTY AM/FM FILTER CW PITCH KEY SPEED P.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 6 PANEL DESCRIPTION $6 SPLIT SWITCH [SPLIT] ➥ Turns the split function ON and OFF when pushed.(p. 58) ➥ Turns the quick split function ON, when pushed for 1 sec. (p. 59) • The offset frequency is shifted from the displayed frequency. • The quick split function can be turned OFF using set mode. (p. 82) ➥ Turns the split function ON and sets the transmit frequency after inputting an offset frequency with the keypad (±4 MHz in 1 kHz steps; p. 58).
01 NEW 2001 NEW IC-7400.qxd 1 02.4.2 11:35 Page 7 PANEL DESCRIPTION ■ Rear panel q !5 !4 !3 w !2 q DC POWER SOCKET [DC 13.8V] (pgs. 14, 16) Accepts 13.8 V DC through the supplied DC power cable (OPC-025D). Rear panel view w ANTENNA CONNECTOR [ANT 144MHz] e ANTENNA CONNECTOR 2 [ANT2] r ANTENNA CONNECTOR 1 [ANT1] (pgs. 14, 15, 17, 75) Accepts a 50 Ω antenna with a PL-259 connector. • [ANT 144MHz] for 144 MHz (2 m) band only; [ANT1] and [ANT2] for both HF and 50 MHz (6 m) bands antennas.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 8 PANEL DESCRIPTION 1 D DATA SOCKET DATA 1 2 3 NAME 1 DATA IN 2 GND Common ground for DATA IN, DATA OUT and AF OUT. 3 PTT P PTT terminal for packet operation. Connect ground to transmit data. 4 4 5 PIN No. 6 5 DESCRIPTION Input terminal for data transmit. (1200 bps: AFSK/9600 bps: G3RUH, GMSK) DATA OUT Data out terminal for 9600 bps operation only. AF OUT Data out terminal for 1200 bps operation only. Squelch out terminal.
2001 NEW IC-7400.qxd 1 2001 NEW 02.4.2 11:35 Page 9 PANEL DESCRIPTION ■ LCD display !4 !3 !2 !1 !0 q o w e r i u y t q FREQUENCY READOUTS Shows the operating frequency. w MULTI-FUNCTION METER INDICATION ➥ Shows receiving signal strength, etc. during receive. ➥ Shows transmit output power, ALC and SWR during transmit. e VOX INDICATOR (p. 54) Appears when the VOX function is activated. r MICROPHONE COMPRESSOR INDICATOR (p. 57) Appears when the microphone compressor is activated.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 10 PANEL DESCRIPTION 1 ■ LCD display (continued) @9 @8 @7 @6 @5 @4 !5 !6 !7 !8 !9 @0 !5 BREAK-IN INDICATORS (p. 55) ➥ “F BK-IN” appears when the full break-in function is activated. ➥ “BK-IN” appears when the semi break-in function is activated. @3 @2 @1 @4 NOISE REDUCTION INDICATOR (p. 52) Appears when the noise reduction is activated. !6 MONITOR INDICATOR (p. 56) Appears when the monitor function is activated. @5 NOTCH INDICATORS (p.
2001 NEW IC-7400.qxd 1 2001 NEW 02.4.2 11:35 Page 11 PANEL DESCRIPTION ■ Multi function switches D M1 FUNCTIONS 1⁄4 During SSB operation AGC DUP CMP TBW SCP F1 F2 F3 F4 F5 During SSB data operation AGC DUP 1/4 F1 F2 F3 SCP F4 TUNING FUNCTION (p. 21) Push to turn the 1/4 ON/OFF. F3 AGC DUP 1/4 KEY SCP F1 F2 F3 F4 F5 tuning function • “ ” indicator appears when the 1⁄4 tuning function is ON. TRANSMISSION BANDWIDTH (p. 57) Push to select the transmission bandwidth.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 12 PANEL DESCRIPTION 1 ■ Microphone (HM-36) q w q UP/DOWN SWITCHES [UP]/[DN] Change the selected readout frequency or memory channel. w PTT SWITCH Push and hold to transmit; release to receive. • Continuous pushing changes the frequency or memory channel number continuously. • While pushing [XFC], the transmit readout frequency can be controlled while in spilt frequency operation. • The [UP]/[DN] switch can simulate a key paddle. Preset in the keyer set mode.
2001 NEW IC-7400.qxd 02.4.2 11:35 2 Page 13 INSTALLATION AND CONNECTIONS ■ Unpacking ■ Antenna connection After unpacking, immediately report any damage to the delivering carrier or dealer. Keep the shipping cartons. For radio communications, the antenna is of critical importance, along with output power and sensitivity. Select antenna(s), such as a well-matched 50 Ω antenna, and feedline. 1.5:1 or better of Voltage Standing Wave Ratio (VSWR) is recommended for your desired band.
IC-7400.qxd 02.4.2 11:35 Page 14 INSTALLATION AND CONNECTIONS 2 ■ Required connections • Front panel i7400 CW KEY TUNER TWIN PBT HF/VHF TRANSCEIVER 1.8 1 ANT 3.5 2 7 3 POWER F-INP NR 4 14 5 21 7 24 8 28 9 SPLIT GENE 50 0 144 ENT A/B 10 NOTCH TRANSMIT 18 6 MW PBTC V/M PHONES MP-W ELEC-KEY AF XFC RF/SQL RIT ∂TX CLEAR RIT/∂TX MIC MIC GAIN A straight key can be used when the internal electronic keyer is turned OFF in keyer set mode. (p.
2001 NEW IC-7400.qxd 2 2001 NEW 02.4.2 11:35 Page 15 INSTALLATION AND CONNECTIONS ■ Advanced connections • Front panel i7400 TUNER HEADPHONES TWIN PBT HF/VHF TRANSCEIVER 1.8 1 ANT 3.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 16 INSTALLATION AND CONNECTIONS ■ Power supply connections 2 CAUTION: Before connecting the DC power Use an optional DC power supply with a 25 A capacity and above when operating the transceiver with AC power. Refer to the diagrams below. cable, check the following important items. 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.
2001 NEW 2001 NEW IC-7400.qxd 2 02.4.2 11:35 Page 17 INSTALLATION AND CONNECTIONS ■ Linear amplifier connections (not usable in European countries) CONNECTING THE IC-PW1 Use the [ANT1] connector when connecting a linear amplifier. Remote control cable (supplied with the IC-PW1) To an antenna ACC(1) ACC cable (supplied with the IC-PW1) REMOTE ANT Coaxial cable INPUT1 Be sure to connect the cable to the 7-pin ACC(2) jack.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 18 3 BASIC OPERATION ■ 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 following procedure. NOTE: When first applying power or when operating in cold environments, the display may flicker or appear faint. This is normal and will disappear once the transceiver has warmed up. q Make sure the transceiver power is OFF.
2001 NEW 2001 NEW IC-7400.qxd 3 02.4.2 11:35 Page 19 BASIC OPERATION ■ 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. Band keys See the table below for a list of the bands available and the default settings for each register. BAND REGISTER 1 REGISTER 2 REGISTER 3 1.8 MHz 1.900000 MHz CW 1.910000 MHz CW 1.915000 MHz CW 3.5 MHz 3.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 20 BASIC OPERATION 3 ■ Selecting VFO/memory mode VFO is an abbreviation of Variable Frequency Oscillator, and is commonly referred to as a main tuning function. The tuning dial is often called the “VFO knob.” [V/M] ➥ Push [V/M] to switch between VFO and memory modes. • Pushing [V/M] for 1 sec. transfers the contents of the selected memory channel to VFO mode (p. 65). ■ VFO operation The transceiver has 2 VFOs and are called VFO A and VFO B.
2001 NEW 2001 NEW IC-7400.qxd 3 02.4.2 11:35 Page 21 BASIC OPERATION ■ Frequency setting The transceiver has several tuning methods for convenient frequency tuning. 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. (p. 19) w Rotate the tuning dial to set the desired frequency. If the dial lock function is activated, the lock indicator lights, and the tuning dial does not function.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 22 BASIC OPERATION 3 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 OFF • “▼” disappears. w Push [TS] for 1 sec. to toggle the 1 Hz tuning step ON and OFF. [TS] 1 Hz indicator D Band edge warning beep When selecting a frequency that lies outside of a band’s specified frequency range, a warning beep sounds. This function can be turned OFF in set mode, if desired. (p.
2001 NEW 2001 NEW IC-7400.qxd 3 02.4.2 11:35 Page 23 BASIC OPERATION ■ 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 follows. To select a mode of operation, push the desired mode switch momentarily. Push the switch again to toggle between USB and LSB, CW/CW-R and RTTY/RTTYR, AM and FM, if necessary. Push the switch for 1 sec.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 24 BASIC OPERATION 3 ■ 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. [RF/SQL] control • The squelch is particularly effective for FM. It is also available for other modes. • The control can be set as the RF gain control only (squelch is fixed open) or squelch control (RF gain is fixed at maximum) in set mode (p. 81).
2001 NEW 2001 NEW IC-7400.qxd 3 02.4.2 11:35 Page 25 BASIC OPERATION ■ Basic transmit operation Before transmitting, monitor your selected operating 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” once or twice, before you begin operating on that frequency.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 26 4 RECEIVE AND TRANSMIT ■ Operating SSB q Push a band key to select the desired band. w Push [SSB] to select LSB or USB. [TRANSMIT] [TX] indicator Band keys • 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. r Rotate the tuning dial to tune a desired signal. • S-meter indicates received signal strength. t Push [TRANSMIT] or [PTT] (microphone) to transmit.
2001 NEW 2001 NEW IC-7400.qxd 4 02.4.2 11:35 Page 27 RECEIVE AND TRANSMIT ■ Operating CW q Push a band key to select the desired band. w Push [CW/RTTY] to select CW. [TRANSMIT] [TX] indicator Band keys • 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. r Rotate the tuning dial to simultaneously tune a desired signal and its side tone. • S-meter indicates received signal strength.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 28 RECEIVE AND TRANSMIT 4 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. q Push [CW/RTTY] several times to select CW mode. w Push [CW/RTTY] for 1 sec. to select CW or CW-R mode. • Check the interfering tone.
2001 NEW 2001 NEW IC-7400.qxd 4 02.4.2 11:35 Page 29 RECEIVE AND TRANSMIT ■ 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 M1. e Push [F4 KEY] to select the memory keyer menu. • The selectable menu can be changed with the keyer send menu in the set mode. (p.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 30 RECEIVE AND TRANSMIT 4 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 M1 is selected in CW mode, push [F4 KEY] to select the memory keyer menu. w Push [F2 SND] to select the keyer send menu. e Push [TRANSMIT] to set the transceiver to transmit, or set the break-in function ON (p. 55).
2001 NEW 2001 NEW IC-7400.qxd 02.4.2 11:35 4 Page 31 RECEIVE AND TRANSMIT 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. • Programming contents q Push [MENU] to select M1, then push [F4 KEY] to select the memory keyer menu.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 32 RECEIVE AND TRANSMIT 4 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 M1, then push [F4 KEY] to select the memory keyer menu. w Push [F4 001] to enter the contest number set mode. e Push [F1≤] or [F2 ≥] to select the desired set item. r Set the desired condition using the tuning dial. • Push [F3] for 1 sec. to select a default condition or value.
2001 NEW 2001 NEW IC-7400.qxd 4 02.4.2 11:35 Page 33 RECEIVE AND TRANSMIT D Keyer set mode This set mode is used to set the CW side tone, memory keyer repeat time, dash weight, paddle specifications, keyer type, etc. • Setting contents q Push [MENU] to select M1, then push [F4 KEY] to select the memory keyer menu. w Push [F5 SET] to select keyer set mode. e Push [F1≤] or [F2 ≥] to select the desired set item. r Set the desired condition using the tuning dial. • Push [F3] for 1 sec.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 34 RECEIVE AND TRANSMIT 4 5. Rise Time This item sets the envelop time period which the output power becomes the set transmit power. • 2, 4, 6 or 8 msec. can be selected. Rise 5 Time 4ms • About rise time Tx Key action Rx Tx output power Set Tx power level Time 6. Paddle Polarity This item sets the paddle polarity. • Normal and reverse polarity can be selected. Paddle 6 Polarity NORMAL 7.
2001 NEW 2001 NEW IC-7400.qxd 4 02.4.2 11:35 Page 35 RECEIVE AND TRANSMIT ■ 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. [TRANSMIT] [TX] indicator Band keys • After RTTY mode is selected, push [CW/RTTY] for 1 sec. to toggle RTTY and RTTY-R modes. e Rotate [AF] to set audio to a comfortable listening level.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 36 RECEIVE AND TRANSMIT 4 ■ 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 M1. e Push [F4 RTY] 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. See the diagram below. • Push [MENU] to return to the previous indication.
2001 NEW 2001 NEW IC-7400.qxd 4 02.4.2 11:35 Page 37 RECEIVE AND TRANSMIT D RTTY filter/Twin peak filter The transceiver has 5 RTTY filters in addition to normal 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. Moreover, the twin peak filter changes the receive frequency response by boosting 2 particular frequencies (2125 and 2295 Hz) for better copying of desired RTTY signals.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 38 RECEIVE AND TRANSMIT 4 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 connector (TNC) is not necessary for receiving a Baudot signal. q Push [CW/RTTY] to select RTTY mode. • After RTTY mode is selected, push [CW/RTTY] for 1 sec. to select RTTY-R mode. w Push [MENU] several times to select M1. e Push [F4 RTY] to select RTTY menu.
2001 NEW 2001 NEW IC-7400.qxd 4 02.4.2 11:35 Page 39 RECEIVE AND TRANSMIT D RTTY set mode This set mode is used to set the mark and shift frequencies, keying type, decode USOS function, etc. • Setting contents q Push [MENU] to select M1, then push [F4 RTY] to select the RTTY menu. w Push [F5 SET] to select RTTY set mode. e Push [F1≤] or [F2 ≥] to select the desired set item. r Set the desired condition using the tuning dial. RTTY 1 • Push [F3] for 1 sec. to select a default condition or value.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 40 RECEIVE AND TRANSMIT 4 ■ 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. [TRANSMIT] [TX] indicator Band keys [MIC GAIN] [AM/FM] Tuning dial • S-meter indicates received signal strength. • The default tuning step for AM mode is 1 kHz; this can be changed using the tuning step program mode. (p.
2001 NEW 2001 NEW IC-7400.qxd 4 02.4.2 11:35 Page 41 RECEIVE AND TRANSMIT ■ 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. [TRANSMIT] [TX] indicator Band keys [MIC GAIN] [AM/FM] Tuning dial • S-meter indicates received signal strength. t Push [TRANSMIT] or [PTT] (microphone) to transmit. • The TX indicator lights red.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 42 RECEIVE AND TRANSMIT 4 D Tone squelch operation Tone squelch operation is a method of communications using selective calling. Only received signals having 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. q Push [AM/FM] to select FM mode. w Push [MENU] several times to select M1. e Push [F4 TON] several times to turn the tone squelch function ON.
2001 NEW 2001 NEW IC-7400.qxd 4 02.4.2 11:35 Page 43 RECEIVE AND TRANSMIT D DTCS operation DTCS function is an another method of communications using selective calling. Only received signals having a matching 3-digit code will open the squelch. q Push [AM/FM] to select FM mode. w Push [MENU] several times to select M1. e Push [F4 TON] several times to turn the DTCS function ON. • “DTCS” appears r Push [F4 TON] for 1 sec. to enter tone frequency set mode.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 44 RECEIVE AND TRANSMIT 4 ■ 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 frequency by an offset frequency. A repeater can be accessed using split frequency operation with the shift frequency set to the repeater’s offset frequency. q Push a band key to select the desired band. w Push [A/B] to select VFO A. e Push [AM/FM] to select FM.
2001 NEW IC-7400.qxd 4 02.4.2 11:35 Page 45 RECEIVE AND TRANSMIT 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. • While holding [XFC], the offset direction and frequency are displayed on the multi-function switch indicator. [XFC] AGC -6OO.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 46 5 FUNCTIONS FOR RECEIVE ■ Simple band scope The band scope function allows you to visually check signal conditions around a specified frequency. The IC7400’s band scope function can be used in any operating mode and frequency band. STEP 0.5k Sweep indicator Band scope indicator Frequency indicator mark Sweep step indicator INDICATOR DESCRIPTION Sweep While the band scope is “sweeping,” “ ” appears; while stopped “ ” appears.
2001 NEW 2001 NEW IC-7400.qxd 5 02.4.2 11:35 Page 47 FUNCTIONS FOR RECEIVE ■ 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 distortion when very strong signals are near the desired frequency or when very strong electric fields, such as from broadcasting stations, are near your location.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 48 FUNCTIONS FOR RECEIVE 5 ■ 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 constant; fast, mid, slow) for non-FM modes. The FM mode AGC time constant is fixed as ‘FAST’ (0.1 sec.) and AGC time constant cannot be selected.
2001 NEW 2001 NEW IC-7400.qxd 5 02.4.2 11:35 Page 49 FUNCTIONS FOR RECEIVE ■ 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. A total of 32 passband widths are available.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 50 FUNCTIONS FOR RECEIVE 5 ■ 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. • Push [FILTER] for 1 sec. • Operating mode can be selected in this step. BW e Push [FILTER] several times to select the desired IF filter. r Push the [F5] to select the filter shape from “SOFT” and “SHARP.
2001 NEW 2001 NEW IC-7400.qxd 5 02.4.2 11:35 Page 51 FUNCTIONS FOR RECEIVE ■ Twin PBT operation General PBT (Passband Tuning) function electronically narrows the IF passband width by shifting the IF frequency to slightly outside of the IF filter passband to reject interference. This transceiver uses the DSP circuit for the PBT function. Moving both [TWIN PBT] controls to the same position shifts the IF. [TWIN PBT] control ➥ The LCD shows the passband width and shift frequency graphically.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 52 FUNCTIONS FOR RECEIVE 5 ■ Noise reduction The noise reduction function reduces noise components 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 ON. • “NR” appears. w Rotate the [NR] control to adjust the noise reduction level. e Push the [NR] switch to turn the noise reduction OFF.
2001 NEW IC-7400.qxd 5 02.4.2 11:35 Page 53 FUNCTIONS FOR RECEIVE ■ Voice squelch control function This function is useful when you don’t want unmodulated signals. 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., squelch opens.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 54 6 FUNCTIONS FOR TRANSMIT ■ VOX function The VOX (Voice-Operated Transmission) function switches between transmit and receive with your voice. This function provides an opportunity to input log entries into your computer, etc., while operating. • Using the VOX function q Select a phone mode (SSB, AM, FM). w Push [VOX/BK-IN] to turn the VOX function ON or OFF.
2001 NEW 2001 NEW IC-7400.qxd 6 02.4.2 11:35 Page 55 FUNCTIONS FOR TRANSMIT ■ Break-in function The break-in function is used in CW mode to automatically toggle the transceiver between transmit and receive when keying. The IC-7400 is capable for full break-in or semi break-in. [VOX/BK-IN] D Semi break-in operation During semi break-in operation, the transceiver selects transmit when keying, then automatically returns to receive after a pre-set time from when you stop keying.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 56 FUNCTIONS FOR TRANSMIT 6 ■ ∂TX function The ∂TX function shifts the transmit frequency up to ±9.99 kHz in 10 Hz steps without moving the receive frequency. [CLEAR] • See #2 on p. 4 for function description. q Push the [∂TX] switch to turn the ∂TX function ON and OFF. • “∂TX” and shift frequency appear when the function is ON. w Rotate the [RIT/∂TX] control. • To reset the ∂TX frequency, push [CLEAR] for 1 sec.
2001 NEW 2001 NEW IC-7400.qxd 6 02.4.2 11:35 Page 57 FUNCTIONS FOR TRANSMIT ■ 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 advance (p. 81). • In SSB mode q Select USB or LSB mode and adjust [MIC GAIN] to a suitable level. w While M1 is selected, push [F3 CMP] to turn the speech compressor ON. • “COMP” appears.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 58 FUNCTIONS FOR TRANSMIT 6 ■ 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. [SPLIT] Lights during split operation The following is an example of setting 21.290 MHz for receiving and 21.310 MHz for transmitting. q Set 21.290 MHz (USB) in VFO A.
2001 NEW 2001 NEW IC-7400.qxd 6 02.4.2 11:35 Page 59 FUNCTIONS FOR TRANSMIT ■ Quick split function When you push the [SPLIT] switch for 1 sec., split frequency 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. Quick split operation is turned ON by default but can be turned OFF in set mode (p. 82).
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 60 FUNCTIONS FOR TRANSMIT 6 ■ Measuring SWR The IC-7400 has a built-in circuit for measuring antenna SWR— no external equipment or special adjustments are necessary. The IC-7400 can measure SWR in 2 ways— spot measurement and plot measurement are available. D Spot measurement q Push [TUNER] to turn the antenna tuner OFF. w Turn the COMP meter OFF. ➥ Push [MENU] for 1 sec. to enter set mode. ➥ Push [F1 ≤] or [F2 ≥] several times to select the COMP Meter item.
2001 NEW IC-7400.qxd 02.4.2 11:35 7 Page 61 MEMORY OPERATION ■ 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. All 101 memory channels are tuneable which means the programmed frequency can be tuned temporarily with the tuning dial, etc. in memory mode.
IC-7400.qxd 02.4.2 11:35 Page 62 MEMORY OPERATION 7 ■ Programming a memory Memory channel programming can be preformed either in VFO mode or in memory mode. [MW] 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 channel. • “BLANK” appears if the selected memory channel is a blank channel (and does not have contents). e Push [MW] for 1 sec. to program the displayed frequency and operating mode into the memory channel.
2001 NEW 2001 NEW IC-7400.qxd 7 02.4.2 11:35 Page 63 MEMORY OPERATION ■ 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. [CALL] AGC DUP CMP TON SCP “C” appears ■ Programming the call channel The call channel is programmed in the same way regular memory channels are.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 64 MEMORY OPERATION 7 ■ Frequency transferring The contents of a memory channel (frequency, operating mode, etc.) can be transferred to the VFO. Frequency transferring can be performed in either VFO mode or memory mode. D Transferring in VFO mode This is useful for transferring programmed contents to VFO. q Select VFO mode with [V/M]. w Select the memory channel to be transferred with [M-CH].
2001 NEW 2001 NEW IC-7400.qxd 7 02.4.2 11:35 Page 65 MEMORY OPERATION ■ 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. 70). By default, P1 is programmed with 0.50000 MHz and P2 is programmed with 29.99999 MHz. If P1 and P2 are programmed with the same frequencies, programmed scan will not proceed. [V/M] [MW] [EXAMPLE]: Programming 14.00000 MHz into P1 and 14.35000 MHz into P2.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 66 MEMORY OPERATION 7 ■ Assigning memory names All memory channels (including scan edges) can be tagged with alphanumeric names of up to 9 characters each. [V/M] [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. e Push [MENU] several times to select M2. r Push [F2 MEM] to select the memory name screen. t Push [F1 EDT] to edit memory channel name.
2001 NEW IC-7400.qxd 7 02.4.2 11:35 Page 67 MEMORY OPERATION ■ Memo pads The transceiver has a memo pad function to store frequency 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. 84) D Writing frequencies and operating modes into memo pads ➥ Push [MP-W] to store the displayed frequency and operating mode into a memo pad.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 68 8 SCANS ■ Scan types PROGRAMMED SCAN ∂F SCAN Repeatedly scans between two scan edge frequencies (scan edge memory channels P1 and P2). Repeatedly scans within ∂F span area. Scan edge P1 or P2 Scan edge P2 or P1 Start frequency –∂F frequency +∂F frequency Scan Scan Scan Jump Jump This scan operates in VFO mode. This scan operates in both VFO and memory modes. MEMORY SCAN SELECT MEMORY SCAN Repeatedly scans all programmed memory channels.
2001 NEW 2001 NEW IC-7400.qxd 8 02.4.2 11:35 Page 69 SCANS ■ Voice squelch control function This function is useful when you don’t want unmodulated 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).
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 70 SCANS 8 ■ Programmed scan/Fine programmed scan (VFO mode) Programmed scan searches for signals between scan edge memory channels P1 and P2. The default frequencies for these memories are 0.500000 MHz and 29.99999 MHz, respectively. See p. 65 for scan edges programming. [TS] [V/M] q Push [V/M] to select VFO mode, if necessary. w Select the desired operating mode. • The operating mode can also be changed while scanning. e Push [TS] to select a tuning step.
2001 NEW 2001 NEW IC-7400.qxd 8 02.4.2 11:35 Page 71 SCANS ■ Memory scan operation (Memory mode) Memory scan searches through memory channel 1 to 99 for signals. Blank (unprogrammed) memory channels are skipped. q Push [V/M] to select memory mode, if necessary. w Push [MENU] to select M2. e Push [F1 SCN] to select the scan menu. • See p. 69 for scan condition. • If the [RF/SQL] control function is set as “AUTO,” the squelch is always open in SSB, CW and RTTY modes.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 72 SCANS 8 ■ ∂F scan operation and Fine ∂F scan ∂F scan searches for signals within the specified range with the displayed VFO or memory channel frequency as for center frequency. The frequency range is specified by the span. Keypad [V/M] q Push [V/M] to select VFO mode or memory mode, as desired. w Set center frequency of the ∂F scan. e Push [MENU] to select M2. r Push [F1 SCN] to select the scan menu. • See p. 68 for scan condition.
2001 NEW IC-7400.qxd 8 02.4.2 11:35 Page 73 SCANS ■ Tone scan/DTCS code scan operation By monitoring a signal that is being operated with a repeater, 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 M1. e Push [F4 TONE] for 1 sec. to enter tone set mode. r Push [F1 TON] to select the tone type to be scanned.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 74 9 ANTENNA TUNER OPERATION ■ Antenna connection and selection The IC-7400 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-7400 covers, there is a band memory which can memorize a selected antenna. When you change the operating frequency beyond a band, the previously used antenna is automatically selected (see below) for the new band.
2001 NEW 2001 NEW IC-7400.qxd 9 02.4.2 11:35 Page 75 ANTENNA TUNER OPERATION ■ Antenna tuner operation The internal automatic antenna tuner matches the transceiver to the connected antenna automatically. Once the tuner matches an antenna, the variable capacitor 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.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 76 ANTENNA TUNER OPERATION 9 ■ Optional external tuner operation 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 antenna connection details. Optional AH-2b antenna element NEVER operate the AH-4 without an antenna wire. The tuner and transceiver will be damaged.
2001 NEW IC-7400.qxd 02.4.2 11:35 10 Page 77 DATA COMMUNICATION ■ Connections ■ When connecting to [DATA] • When using a PC application q DATA IN w GND TX AUDIO GND r DATA OUT (9600 bps) RX AUDIO y P SQL* t AF OUT (1200 bps) e PTT P SQL Connect to serial port, parallel port, speaker jack, microphone jack and line IN/OUT jack, etc. See the instruction manual of the application for details.
IC-7400.qxd 02.4.2 11:35 Page 78 DATA COMMUNICATION 10 ■ Packet (AFSK) operation Before operating packet (AFSK) be sure to consult the operating manual that came with your TNC. [TRANSMIT] [TX] indicator Band keys [MIC GAIN] [SSB] [AM/FM] Tuning dial 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 operating mode. • After LSB or USB is selected, push [SSB] for 1 sec.
2001 NEW IC-7400.qxd 10 02.4.2 11:35 Page 79 DATA COMMUNICATION ■ Adjusting the TNC output level When setting data transmission speed to 9600 bps, the data signal coming from the TNC is applied exclusively 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 maintain the band width and may possibly interfere with other stations.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 80 SET MODE 11 ■ General set mode D Entering set mode Set mode is used for programming infrequently changed values or conditions of functions. • Set mode operation [F1 ≤] [F2 ≥] q Push [MENU] several times to select the function menu indication, if necessary. w Push [MENU] for 1 sec. to enter the set mode. e Push [F1 ≤] or [F2 ≥] to select the desired item. r Set the desired condition using the tuning dial. • Push [F3] for 1 sec.
2001 NEW 2001 NEW IC-7400.qxd 02.4.2 11:35 11 SET MODE Page 81 ■ General set mode (continued) 6. Beep A beep sounds each time a switch is pushed to confirm it. This function can be turned OFF for silent operation. ON OFF Beep 6 ON Confirmation beep ON (default) Confirmation beep OFF The volume level can be set in 3. Beep Level. (p. 80) 7. Band Edge Beep A beep sounds when an operating frequency enters or exits an amateur band. This functions independent of the confirmation beep setting (above).
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 82 SET MODE 11 ■ General set mode (continued) 11. Quick SPLIT 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 SPLIT Offset item below, and activates the split function automatically. ON OFF Quick 11 SPLIT SPLIT 12 Offset O.OOOMHz SPLIT 13 LOCK ON Quick split ON (default) Quick split OFF 12.
2001 NEW 2001 NEW IC-7400.qxd 02.4.2 11:35 11 SET MODE Page 83 ■ General set mode (continued) 17. One Touch Rptr This item turns the one touch repeater function ON (DUP- or DUP+) and OFF. One 17 Touch Rptr DUP- When [F2 DUP] is pushed for 1 sec. in M1, the selected offset direction and the programmed duplex offset frequency (depending on the operating frequency band) is set with the displayed frequency. 19.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 84 SET MODE 11 ■ General set mode (continued) 23. SPEECH Language When the optional UT-102 VOICE SYNTHESIZER UNIT is installed, you can select between English and Japanese as the language. English Japanese SPEECH 23 Language English SPEECH 24 Speed HIGH SPEECH 25 S-Level ON Memory 26 Pad : Announces in English (default) : Announces in Japanese See p. 89 for unit installation. 24.
2001 NEW 2001 NEW IC-7400.qxd 02.4.2 11:35 11 SET MODE Page 85 ■ General set mode (continued) 27. DIAL Auto TS This item sets the auto tuning step function. When rotating the tuning dial rapidly, the tuning step automatically changes several times as selected. DIAL 27 Auto TS HIGH There are 2 type of auto tuning steps: HIGH (Fastest) and LOW (Faster). HIGH LOW OFF : Auto tuning step is turned ON. Approx.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 86 SET MODE 11 ■ General set mode (continued) 32. SSB/CW Synchronous Tuning This item selects the displayed frequency shift function from ON and OFF. SSB/CW 32 Sync Tun 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. ON OFF : The displayed frequency shifts when the operating mode is changed between SSB and CW. : The displayed frequency does not shift.
2001 NEW 2001 NEW IC-7400.qxd 02.4.2 11:35 11 SET MODE Page 87 ■ General set mode (continued) 36. CI-V Baud Rate This item sets the data transfer rate. 300, 1200, 4800, 9600, 19200 bps and “Auto” are available.
2001 NEW IC-7400.qxd 02.4.2 11:35 Page 88 SET MODE 11 ■ Tone control set mode D Entering tone control set mode Tone levels (bass and treble) for each transmit and receive audio can be set for each phone mode independently. [F1 ≤] [F2 ≥] [F4 TCN] • Set mode operation q Push [MENU] several times to select M2. w Push [F4 TCN] to select the tone control set mode. e Push [F1 ≤] or [F2 ≥] to select the desired item. r Push [SSB] or [AM/FM] to select the desired operating mode.
2001 NEW IC-7400.qxd 02.4.2 11:36 12 Page 89 OPTION INSTALLATION ■ 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. Otherwise, there is danger of electric shock and/or equipment damage.
IC-7400.qxd 02.4.2 11:36 Page 90 OPTION INSTALLATION 12 ■ 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 previous 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.
2001 NEW IC-7400.qxd 02.4.2 11:36 13 Page 91 MAINTENANCE ■ Troubleshooting The following chart is designed to help you correct problems which are not equipment malfunctions. POWER PROBLEM 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 RECEIVE REF. p. 16 • Re-connect the DC power cable correctly. • Check for the cause, then replace the fuse with p. 92 the spare one.
IC-7400.qxd 02.4.2 11:36 Page 92 13 MAINTENANCE DISPLAY PROBLEM POSSIBLE CAUSE The displayed frequency • The dial lock function is activated. does not change properly. • A set mode screen is selected. • The internal CPU has malfunctioned. SOLUTION REF. • Push [LOCK/SPCH] to turn the function OFF. p. 52 • Push [MENU] several times to exit the set — mode. • Reset the CPU. p.
2001 NEW IC-7400.qxd 13 02.4.2 11:36 Page 93 MAINTENANCE ■ Resetting the CPU When first applying power or when the function does not seem to be operating normally, reset the CPU as follows: [POWER] [F-INP] [M-CL] q Make sure the transceiver power is OFF. w While pushing [M-CL] and [F-INP], push [POWER] for 1 sec. to turn power ON. • The internal CPU is reset. • The transceiver displays its initial VFO frequency when resetting is complete. e Correct the set mode settings after resetting, if desired.
2001 NEW IC-7400.qxd 02.4.2 11:36 Page 94 14 CONTROL COMMAND ■ Remote jack (CI-V) information • CI-V connection example The transceiver can be connected through an optional CT-17 CI-V LEVEL CONVERTER to a personal computer equipped with an RS-232C port. The Icom Communications Interface-V (CI-V) controls the following functions of the transceiver. IC-7400 9–15 V DC Up to 4 Icom CI-V transceivers or transceivers can be connected to a personal computer equipped with an RS-232C port. See p.
2001 NEW IC-7400.qxd 2001 NEW 02.4.
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2001 NEW IC-7400.qxd 2001 NEW 02.4.2 11:36 14 Page 97 CONTROL COMMAND • Command table (continued) Command Sub command Description 0577 Send/read MONITOR level (0=0% to 255=100%) Send/read DATA mode (0=OFF, 1=ON) Send/read SSB transmit bandwidth (0=WIDE, 1=MID, 2=NAR) Send/read DSP filter shape (0= sharp, 1= soft) 1A 06 07 08 1B 00 Set/read repeater tone frequency (see p. 98 for details) Set/read TSQL tone frequency (see p. 98 for details) Set/read DTCS code and polarity (see p.
2001 NEW IC-7400.qxd 02.4.2 11:36 Page 98 CONTROL COMMAND 14 D Split/Duplex frequency setting The following data sequence is used when sending/reading the split or duplex frequency setting. 0 X 1 MHz digit: 0—4 XX Direction: 00=+ direction 01=— direction X r* 10 MHz digit: 0 (fixed) X 10 kHz digit: 0—9 0 e 100 kHz digit: 0—9 X 100 Hz digit: 0 (fixed) w 1 kHz digit: 0—9 q *No need to enter for duplex frequency setting. D Repeater tone/tone squelch frequency setting X X 0.
2001 NEW IC-7400.qxd 02.4.2 11:36 15 Page 99 SPECIFICATIONS • General • Frequency coverage Receive Transmit • Receiver : (Unit: MHz) 0.030– 60.000000*1*2 144.000– 146.000000 1.800– 1.999999*2 3.500– 3.999999*2 7.000– 7.300000*2 10.100– 10.150000*2 14.000– 14.350000*2 18.068– 18.168000*2 21.000– 21.450000*2 24.890– 24.990000*2 28.000– 29.700000*2 50.000– 54.000000*2 144.000– 146.000000 *1Some frequency ranges are not guaranteed. *2Depending on version. • Mode • No. of memory ch.
2001 NEW IC-7400.qxd 02.4.2 11:36 Page 100 OPTIONS 16 IC-PW1 HF/50 MHz ALL BAND 1 kW LINEAR AMPLIFIER PS-125 DC POWER SUPPLY Full-duty 1 kW linear amplifier including an automatic antenna tuner. Has automatic tuning and band selection capability. Full break-in (QSK) operation is possible. The amplifier/power supply unit and the remote control unit are separated. Light weight switching regulator system power supply.
2001 NEW IC-7400.qxd 02.4.2 11:36 17 Page 101 ABOUT CE INSTALLATION NOTES For amateur base station installations it is recommended that the forwards clearance in front of the antenna array is calculated relative to the EIRP (Effective Isotropic Radiated Power). The clearance height below the antenna array can be determined in most cases from the RF power at the antenna input terminals. EIRP clearance heights by frequency band 1 Watts 2.1 m 10 Watts 2.8 m 25 Watts 3.
IC-7400.qxd 02.4.2 11:36 Page 102 ABOUT CE 17 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 Suite measurements have been performed. Kind of equipment: HF/VHF ALL MODE TRANSCEIVER Type-designation: i7400 Düsseldorf 25th Jan.
2001 NEW IC-7400.qxd 02.4.2 11:36 Page Z IC-7400 #03 (Europe) ■ GER ■ NED ■ ITA ■ AUT ■ BEL ■ GRE ■ GBR ■ LUX ■ SWE ■ IRL ■ ESP ■ DEN ■ FRA ■ POR ■ FIN ■ SUI IC-7400 #04 (France) ■ GER ■ NED ■ ITA ■ AUT ■ BEL ■ GRE ■ GBR ■ LUX ■ SWE ■ IRL ■ ESP ■ DEN ■ FRA ■ POR ■ FIN ■ SUI IC-7400 #05 (Denmark) IC-7400 #08 (Italy) IC-7400 #09 (Spain) A-6086H-1EX-q Printed in Japan © 2002 Icom Inc.
