INSTRUCTION MANUAL HF/VHF ALL MODE TRANSCEIVER i7400 FOREWORD 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. PRECAUTIONS R WARNING HIGH VOLTAGE! NEVER attach an antenna or internal antenna connector during transmission. This may result in an electrical shock or burn. R NEVER apply AC to the [DC13.8V] jack on the transceiver rear panel. This could cause a fire or ruin the transceiver. R NEVER apply more than 16 V DC, such as a 24 V battery, to the [DC13.8V] jack on the transceiver rear panel. This could cause a fire or ruin the transceiver. FEATURES · 32-bit Floating point DSP and 24-bit AD/DA converter · DSP IF Filter creates 102 types of filter · All mode capability covering 160­2 m · 100 Watt continuous duty cycle · All mode digital modulation and demodulation · RTTY demodulator and decoder · Twin Pass Band Tuning · RF speech compression with selectable pass band · Microphone Equalizer · SSB/CW synchronous tuning R NEVER let metal, wire or other objects touch any internal part or connectors on the rear panel of the transceiver. This may result in an electric shock. NEVER expose the transceiver to rain, snow or any liquids. AVOID using or placing the transceiver in areas with temperatures below ­10°C (+14°F) or above +60°C (+140°F). Be aware that temperatures on a vehicle's dashboard can exceed 80°C (+176°F), resulting in permanent damage to the transceiver if left there for extended periods. AVOID placing the transceiver in excessively dusty environments or in direct sunlight. AVOID placing the transceiver against walls or putting anything on top of the transceiver. This will obstruct heat dissipation. Place unit in a secure place to avoid inadvertent use by children. During mobile operation, DO NOT operate the transceiver without running the vehicle's engine. When the transceiver's power is ON and your vehicle's engine is OFF, the vehicle's battery will soon become exhausted. Make sure the transceiver power is OFF before starting the vehicle. This will avoid possible damage to the transceiver by ignition voltage spikes. During maritime mobile operation, keep the transceiver and microphone as far away as possible from the magnetic navigation compass to prevent erroneous indications. BE CAREFUL! The heatsink will become hot when operating the transceiver continuously for long periods. BE CAREFUL! If a linear amplifier is connected, set the transceiver's RF output power to less than the linear amplifier's maximum input level, otherwise, the linear amplifier will be damaged. Use Icom microphones only (supplied or optional). Other manufacturer's microphones have different pin assignments, and connection to the IC-7400 may damage the transceiver. IMPORTANT READ THIS INSTRUCTION MANUAL CAREFULLY before attempting to operate the transceiver. SAVE THIS INSTRUCTION MANUAL. This manual contains important safety and operating instructions for the IC-7400. EXPLICIT DEFINITIONS WORD DEFINITION Personal injury, fire hazard or electric R WARNING shock may occur. CAUTION NOTE Equipment damage may occur. If disregarded, inconvenience only. No risk or personal injury, fire or electric shock. i TABLE OF CONTENTS FOREWORD ..................................... i IMPORTANT ..................................... i EXPLICIT DEFINITIONS .................. i PRECAUTIONS ................................ i TABLE OF CONTENTS ................... ii QUICK REFERENCE GUIDE ..... I ­ X I Installation ....................................... I I Operation ....................................... III I Your first contact ........................... IV I Ready to call CQ? ......................... IX I Operating CW ............................... 27 I Electronic keyer functions ............ 29 I Operating RTTY (FSK) ................. 35 I RTTY functions ............................. 36 I Operating AM ............................... 40 I Operating FM ............................... 41 I Repeater operation ....................... 44 I Preparation ................................... 68 I Voice squelch control function ...... 69 I Scan set mode ............................. 69 I Programmed scan/Fine programmed scan .............................................. 70 I Memory scan operation ................ 71 I Select memory scan ..................... 71 I F scan operation and Fine F scan ...................................................... 72 I Tone scan/DTCS code scan operation ...................................... 73 5 FUNCTIONS FOR RECEIVE ........................................ 46 ­ 53 I Simple band scope ....................... 46 I Preamp/Attenuator ....................... 47 I RIT function .................................. 47 I AGC function ................................ 48 I IF filter selection ........................... 49 I IF (DSP) filter shape ..................... 50 I Noise blanker ............................... 50 I Meter peak hold function .............. 50 I Twin PBT operation ...................... 51 I Noise reduction ............................ 52 I Notch function .............................. 52 I Dial lock function .......................... 52 I Voice squelch control function ...... 53 1 PANEL DESCRIPTION ........ 1 ­ 12 I Front panel ..................................... 1 I Rear panel ...................................... 7 I LCD display .................................... 9 I Multi function switches .................. 11 I Microphone (HM-36) .................... 12 9 ANTENNA TUNER OPERATION ......................................... 74­76 I Antenna connection and selection 74 I Antenna tuner operation ............... 75 I Optional external tuner operation . 76 10 DATA COMMUNICATION .. 77 ­ 79 I Connections ................................. 77 I Packet (AFSK) operation .............. 78 I Adjusting the TNC output level ..... 79 I Data transmission speed .............. 79 2 INSTALLATION AND CONNECTIONS ................ 13 ­ 17 I Unpacking .................................... 13 I Selecting a location ...................... 13 I Grounding ..................................... 13 I Antenna connection ...................... 13 I Required connections ................... 14 I Advanced connections ................. 15 I Power supply connections ............ 16 I Linear amplifier connections (not usable in European countries)....... 17 I External antenna tuner connections .................................. 17 6 FUNCTIONS FOR TRANSMIT ............................................ 54 ­ 60 I VOX function ................................ 54 I Break-in function .......................... 55 I TX function ................................ 56 I Monitor function ............................ 56 I Speech compressor ..................... 57 I Transmit filter width selection ....... 57 I Split frequency operation .............. 58 I Quick split function ....................... 59 I Measuring SWR ........................... 60 11 SET MODE ......................... 80­88 I General set mode ......................... 80 I Tone control set mode .................. 88 12 OPTION INSTALLATION .. 89 ­ 90 I Opening the transceiver's case .... 89 I UT-102 VOICE SYNTHESIZER UNIT ... 89 I CR-338 HIGH STABILITY CRYSTAL UNIT ..................................................... 90 3 BASIC OPERATION .......... 18 ­ 25 I When first applying power (CPU resetting) ............................. 18 I Initial settings ................................ 18 I Selecting an operating band ........ 19 I Selecting VFO/memory mode ...... 20 I VFO operation .............................. 20 I Frequency setting ......................... 21 I Operating mode selection ............ 23 I Volume setting .............................. 23 I Squelch and receive (RF) sensitivity ...................................... 24 I Basic transmit operation ............... 25 13 MAINTENANCE ................. 91­93 I Trouble shooting ........................... 91 I Fuse replacement ......................... 92 I Tuning dial brake adjustment ....... 92 I Resetting the CPU ........................ 93 I Frequency calibration (approximate) ..................................................... 93 7 MEMORY OPERATION ..... 61 ­ 67 I Memory channels ......................... 61 I Memory channel selection ............ 61 I Programming a memory ............... 62 I Memory clearing ........................... 62 I Selecting the call channel ............. 63 I Programming the call channel ...... 63 I Frequency transferring ................. 64 I Programming scan edges ............ 65 I Assigning memory names ............ 66 I Memo pads ................................... 67 14 CONTROL COMMAND ...... 94­98 I Remote jack (CI-V) information .... 94 15 SPECIFICATIONS ..................... 99 16 OPTIONS................................. 100 4 RECEIVE AND TRANSMIT 26­45 I Operating SSB ............................. 26 8 SCANS .............................. 68 ­ 73 I Scan types .................................... 68 17 ABOUT CE ...................... 101­102 SUPPLIED ACCESSORIES The transceiver comes with the following accessories. Qty. q DC power cable* ................................................ 1 w Hand microphone (HM-36) ................................ 1 e Spare fuses (FGB 30 A) .................................... 2 r Spare fuse (FGB 5 A) ........................................ 1 t CW keyer plug (AP-330) .................................... 1 *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 Kingdom, Germany, France, Spain, Russia and/or other countries. ii q w e r t QUICK REFERENCE GUIDE I 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. Grounding your Shack Although your radio will operate by connecting the DC power supply and antenna, it is necessary to have a good ground system in your shack. A ground connection is the electrical contact between the common point of an electrical or electronic system and the earth. A good earth ground is necessary to prevent electrical shock, eliminate problems from RFI and DC noise. With more electronic devices being used today, it is also important to reduce RFI and EMI. Although you may not see interference in your shack, without a grounding system, your neighbors may experience interference. Even though many of these devices, where they must accept interference from their surrounding environment, it is best to eliminate as much of the possible interference from your shack. If you do not have a grounding system for your shack, depending on the location of your shack, basement or ground floor, a good ground system can be as simple as a couple of ground rods driven 2 to 2.5 meter into the soil. When installing your IC-7400 to your grounding system, the shortest most direct connection is recommended. NOTE: There are many publications covering proper grounding techniques. Check with your local dealer for more information and recommendations. R WARNING!: NEVER ground station equipment or antennas to house gas lines. NEVER attach ground lines to plastic (pvc) pipe. D Some Symptoms if inadequate grounding a. Poor DC Ground 50/60 Hz hum on the audio either Rx or Tx without the antenna connected. If you feel a tingling sensation when you touch a metal surface. Surfaces such as the cover of your radio or power supply. b. Poor RF Ground While transmitting and you feel a tingling sensation when you touch a metal surface. Surfaces such as the cover of your radio or power supply. While transmitting, you experience interference to other electronic devices, such as the telephone, television or stereo audio systems. 2. Installing your DC Power Supply The DC power supply is a device used to convert 110/220 V AC, also know as Household current, to a steady source of 13.8 V DC. The perfect match to your IC-7400 is the PS-125. This compact switching power supply is the matching power supply for your IC-7400 with a current rating of 25 A continuous duty. This plug and play unit plugs into the DC jack located on the rear of the radio. PS-125 DC power socket Transceiver · If you are not using the PS-125: Connect the supplied DC power cable to the appropriate color coded terminals, then insert the DC connector into the DC jack located on the rear of the radio. (The diagram below describes the connection with OPC-639. OPC-025D has no filter box and GND cable.) AC A DC power outlet supply* Red Black +_ to DC power socket Transceiver AC cable Supplied *13.8 V; at least 23 A 30 A fuses DC power cable continuous DC power cable Connect to an AC outlet using the supplied AC cable. NOTE: Although the power supply current requirement is quite low during receiving, this not the case when you transmit. With many electrical devices in the shack, it is very important to verify the electrical circuit is not overloaded. I 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. 4. Installing your antenna system Whether your IC-7400 is your first radio or one of many, one of your key elements in a great shack is the antenna system. There are three connections on the back of your IC-7400, 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. ANTENNA 1, 2 [Example]: ANT1 for 1.8­18 MHz bands ANT2 for 21­50 MHz bands Antenna SWR Each antenna is tuned for a specified frequency range and SWR may be increased out-of-range. When the SWR is higher than approx. 2.0:1, the transceiver's power drops to protect the final transistors. In this case, an antenna tuner is useful to match the transceiver and antenna. Low SWR allows full power for transmitting even when using the antenna tuner. The IC-7400 has an SWR meter to monitor the antenna SWR continuously. PL-259 CONNECTOR INSTALLATION EXAMPLE q 30 mm Slide the coupling ring down. Strip the cable jacket and soft solder. Strip the cable as shown at left. Soft solder the center conductor. Slide the connector body on and solder it. Coupling ring 10 mm (soft solder) 10 mm w Soft solder 1­2 mm e 144 MHz ANTENNA Connect a VHF (60­144 MHz) antenna; impedance: 50 . solder solder r Screw the coupling ring onto the connector body. 30 mm 9/8 in 10 mm 3/8 in 1­2 mm 1/16 in Your IC-7400 is equipped with an internal antenna tuner (ATU) for operation on 160­6 m. This ATU is designed to work with an unbalanced 50 feedline. The purpose of the internal antenna tuner is to match the impedance of your antenna system to as close to a 50 load as possible. This ATU will not operate with a long wire or ladder line (450 or other balanced feedlines). An external ATU such as the AH-4 would be necessary for this kind of operation. R WARNING: Although a mag mount antenna works great on a vehicle, DO NOT use the IC-7400 with this type of antenna. CAUTION: Although your IC-7400 has protection to drop down power with a high SWR, this does not completely protect the transceiver from transmission without an antenna. Make sure you have an antenna connected whenever you transmit with your radio. NOTE: There are many publications covering proper antennas and their installation, check with your local dealer for more information and recommendations. II 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. I Operation 1. Voice Microphones: Connect the microphone to the eightpin connector on the front of the radio. MICROPHONES HM-36 SM-20 2. CW CW Key: There are several types of keys or keyers that can be used with your IC-7400. a. Iambic Key paddle: Use a 6.35(d) mm (1/4) stereo plug and connect to the [ELEC-KEY] jack located on the front of the radio. b. Straight Key: Use a 6.35(d) mm (1/4) mono plug and connect key to the back of the radio. c. External Keyer: Use a 6.35(d) mm (1/4) mono plug and connect to the back of the radio. d. Computer Keying: Use a 6.35(d) mm (1/4) mono plug and connect to the back of the radio. CW KEY (dot) (com) (dash) STRAIGHT KEY (+) (_) A straight key can be used when the internal electronic keyer is turned OFF in keyer set mode. (p. 34) NOTE: You will need to select the type of keyer you are using in the Keyer Set mode. There are many advanced CW functions in this set mode, until you have a full understanding of these functions change only the items necessary. III 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. External Speaker: A 3.5(d) mm (1/8) mono jack for operation with an external speaker. (Input impedance: 8 /Max. input power: 5 W) HEADPHONES EXTERNAL SPEAKER 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" an enjoyable experience. D Getting started 1. Before powering up your radio, you may want to make sure the following controls are set in the following positions: 2. Resetting the CPU: Although you have purchased a brand new radio, some settings may be changed from the factory defaults during the QC process. So your radio can start from Factory Defaults resetting the CPU is necessary. [POWER] [F-INP] [M-CL] : Commonly referred to as the volume: fully counter clockwise. · [NR] : The noise reduction control: fully counter clockwise. · [MIC GAIN] : The mic gain: fully counter clockwise. · [RF/SQL] : The control for the RF Gain and Squelch circuits: 12 o'clock. · [CW PITCH] : The control for the CW pitch: 12 o'clock. · [KEY SPEED] : Internal CW Keyer Speed: fully counter clockwise. · [NOTCH] : Control for the manual notch: 12 o'clock · [AF] IV 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]. This will immediately change the displayed operating frequency to the 20-meter band. By pushing [14 5] again, frequency pre-sets in the triple band stacking registers frequency can be displayed. For more details on this system refer to p. 19. 1.8 1 10 4 21 7 GENE 3.5 2 14 5 24 8 50 0 7 3 18 6 28 9 144 ENT 2. Tune to the desired frequency Directly below the keypad is the tuning knob. This will allow you to dial in the frequency you want to operate. You will notice the tuning speed [TS] is 10 Hz resolution. Page 22 will instruct you on how to set the tuning speed [TS] for 1 Hz resolution. NOTE: Although you can directly enter the frequency with the keypad, using the Band Stacking Register and the tuning knob is the most popular method of hoping around the bands. For more information regarding the direct frequency entry method, refer to p. 22. 3. Verify proper antenna has been selected. Your IC-7400 has three antenna connectors. Two for HF and 6 m and a one for 2 m. The selection for 2 m is automatic, where the HF and 6 m is user selectable for either one of the antenna jacks. For first time use, the antenna selector should show " " on the display of your radio. Verify the antenna selected on the display is the antenna port your antenna is connected to. Either "1" or "2" appears. *No indicator appears during 144 MHz operation. 4. Adjust audio output Adjust this control to a comfortable audio level. AF RF/SQL Decreases Increases No audio output Max. audio output V 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. SSB CW/RTTY AM/FM Hint! The Triple Band Stacking Register will memorize the last three frequencies used in the band, as well as the Mode, Filter, Tuner and AGC settings. This makes band hoping much easier. 2. Reducing interference Your IC-7400 has many features to reduce QRM and QRN from the desired signal. 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 [PHONES] jack. NR NOTCH Decreases Increases OFF Noise reduction ON Noise reduction OFF [NR] [NR] AGC DUP CMP TBW SCP Appears b. Adjusting the Noise Reduction: The noise reduction is completely variable on how much of the DSP Noise Reduction is used [NR] level control located just above the [NR] switch. Hint! How far you advance the NR control will determine how much the noise can be effectively reduced. Turning the control too far clockwise may cause some distortion to occur on the received signal. The NR control should only be turned as far clockwise as is necessary. Use this control, along with RF gain, NB (noise blanker, if needed), and IF filters as well, to minimize the effects of noise on the target signal. VI 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. Hint! The Automatic Notch will not operate in the SSB data, CW or RTTY modes. · Manual: The Manual notch provides 70 dB of attenuation to pin point an interfering signal. The 12 o'clock position is on the operating frequency, turning the Notch knob clockwise moves the notch up the band and counter clockwise will move the notch down the band. Once selected an icon "NOTCH" will appear on the display. NR NOTCH [A/NOTCH] [NOTCH] AGC DUP CMP TBW SCP Notch function indicators Low frequency High frequency NOTE: Your IC-7400 is equipped with multiple AGC circuits. This allows the DSP to filter out interfering signals and QRM, while also taking this interference out of the AGC. Bottom line, this will either eliminate or greatly reduce the pumping of the AGC from the interfering signal. 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., you enter the filter set mode. This is where you are able set the three filter presets. Across the bottom of the display you will see the "BW" icon. The switch directly below, along with the tuning dial, will be used to select the changes you will make. · Filter set mode indication BW Shows the selected filter and passband width. · Indication while setting BW [FILTER] Reverses Appears While pushing [F1 BW], rotate the tuning dial to set passband width. AGC DUP CMP TBW SCP The selected filter width is indicated for approx. 1 sec. when [FILTER] is Filter selection pushed. VII 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. DUP CMP TBW SCP Passband width and shifting value are indicated while [TWIN PBT] is operated. Appears when PBT is used. NOTE: The Twin PBT filters shift the two IF DSP filters (See Diagrams below and right). This feature allows both an IF shift as well as a narrowing of the Pass Band. Although you can narrow the pass band by shifting the two filters, this does not narrow both filters, thus the filter shape is not narrowed. You may hear some signal artifacts pass through this filter adjustment. · Filter set mode indication BW Shows the selected filter and passband width. · Indication while PBT setting BW Appears when passband is shifted. *By pushing [PBTC] for 1 sec., the shifted value returns to the default setting, and the "dot" disappears. Center Passband Passband IF shift pass band IF center frequency interference desired signal inteference desired signal IF center freq. interference VIII QUICK REFERENCE GUIDE 3. RX Tone Control: 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. r Push [F1 ] or [F2 ] to change to the desired component. [F1 ] [F2 ] [F4 TCN] [MENU] Tuning dial 1. RX Bass This item adjusts the bass level of the receive audio tone from ­5 dB to +5 dB in 1 dB steps. RX 3 Bass SSB O 2. RX Treble This item adjusts the treble level of the receive audio tone from ­5 dB to +5 dB in 1 dB steps. We hope these pointers have been helpful. Now you are ready for the "Ready to call CQ?". RX 4 Treble SSB O I Ready to call CQ? [NR]: Max. CCW i7400 TUNER ANT NOTCH [NOTCH]: Max. CCW HF/VHF TRANSCEIVER TWIN PBT 1.8 1 10 4 21 7 GENE 3.5 2 14 5 24 8 50 0 7 3 F-INP POWER NR 18 6 28 9 144 ENT MP-R RX LOCK TRANSMIT [TRANSMIT]: OFF PHONES NR SPLIT PBTC MW M-CL A /B V/M MP-W TS M-CH A/NOTCH RF/SQL TX XFC ELEC-KEY AF RIT TX CLEAR [AF]: Max. CCW [RF/SQL]: 12 o'clock [MIC GAIN]: Max. CCW MIC F1 F2 F3 F4 F5 RIT/TX MENU SSB CW/RTTY AM/FM FILTER MIC GAIN RF PWR CW PITCH KEY SPEED P.AMP/ATT NB VOX/BK-IN MONITOR CALL LOCK/ SPCH [RF PWR]: Max. CCW [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 audio level for full output power. IX 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 : 2.8 kHz ; Great Full Audio Mid : 2.4 kHz ; Great for operators with deep full voices Nar : 2.2 kHz ; Great for breaking through pile ups AGC F1 DUP F2 CMP F3 TBW F4 SCP F5 Push [F4] TX BW=WIDE AGC DUP CMP TBW F1 F2 F3 F4 SCP F5 The selected transmit filter width is displayed for approx. 1 sec. Push [F4] for 1 sec. to select the transmit filter width. 4. Microphone Equalizer Although these bandwidths are fixed, the Microphone Tone Control will give you more audio control for your voice operation on SSB, AM, and FM modes. Your IC7400 is equipped with a very powerful equalizer system with 121 possible combinations. This is achieved by using the separate bass and treble adjustments. The default for both the Base and Treble is at 0 dB. Entering Microphone Tone Control set mode: 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. r Push [F1 ] or [F2 ] to change to the desired component. [MENU] Tuning dial [F1 ] [F2 ] [F4 TCN] Hint! Voice patterns and audio characteristics vary with each operator, therefore the [MIC GAIN], DSP TX Audio Pass Band and Microphone Tone Control settings will be different for each operator. Actual on air experimenting is necessary to get just the right sound. Listen to your transmit audio with headphones and the monitor function turned ON. It's also best to test and adjust your audio on the air, while someone who knows what your real voice sounds like listens, and provides and opinion on your audio quality. 1. TX Bass This item adjusts the bass level of the transmit audio tone from ­5 dB to +5 dB in 1 dB steps. TX 1 Bass SSB O 2. TX Treble This item adjusts the treble level of the transmit audio tone from ­5 dB to +5 dB in 1 dB steps. TX 2 Treble SSB O Verify you have selected a clear frequency and call out your CQ! X 1 PANEL DESCRIPTION I Front panel !7 !6 !5 !4 !3 !2 i7400 HF/VHF TRANSCEIVER q w e TUNER ANT NOTCH 1.8 1 10 4 21 7 GENE 3.5 2 14 5 24 8 50 0 7 3 F-INP POWER NR 18 6 28 9 144 ENT MP-R RX LOCK TRANSMIT SPLIT A /B TS PHONES NR MP-W A/NOTCH RF/SQL TX XFC ELEC-KEY AF r MIC F1 F2 F3 F4 F5 t MENU SSB CW/RTTY AM/FM FILTER MIC GAIN RF PWR CW PITCH KEY SPEED P.AMP/ATT NB VOX/BK-IN MONITOR CALL LOCK/ SPCH y u io q POWER SWITCH [POWER] Push momentarily to turn power ON. !0 !1 t MICROPHONE CONNECTOR [MIC] Accepts the supplied or an optional microphone. · See p. 101 for appropriate microphones. · See p. 12 for microphone connector information. · 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. · The [TX] indicator lights red while transmitting and the [RX] indicator lights green when the squelch is open. e HEADPHONE JACK [PHONES] Accepts headphones. · Output power: 5 mW with an 8 load. · When headphones are connected, the internal speaker or connected external speaker does not function. y RF GAIN CONTROL/SQUELCH CONTROL [RF/SQL] (outer control) Adjusts the RF gain and squelch threshold level. The squelch removes noise output from the speaker (closed condition) when no signal is received. · The squelch is particularly effective for FM. It is also available for other modes. · 12 to 1 o'clock position is recommended for any setting of the [RF/SQL] control. · The control can be set as `Auto' (RF gain control in SSB, CW and RTTY; squelch control in AM and FM) or squelch control (RF gain is fixed at maximum) in set mode as follows. (p. 81) MODE SSB, CW RTTY AM, FM AUTO SET MODE SETTING SQL RF GAIN + SQL SQL SQL RF GAIN + SQL RF GAIN + SQL r ELECTRONIC KEYER JACK [ELEC-KEY] (p. 14) Accepts a paddle to activate the internal electronic keyer for CW operation. · Selection between the internal electronic keyer, bug-key and straight key operation can be made in keyer set mode. (p. 34) · A straight key jack is separately available on the rear panel. See [KEY] on p. 7. · Keyer polarity (dot and dash) can be reversed in keyer set mode. (p. 34) · 4-channel memory keyer is available for your convenience. (p. 30) (dot) (com) (dash) RF GAIN SQL · When setting as RF gain/squelch control Noise squelch (FM mode) Squelch is open. Recommended level Maximum RF gain RF gain adjustable range S-meter squelch 1 PANEL DESCRIPTION 1 · When functioning as RF gain control (Squelch is fixed open; SSB, CW, RTTY only) Maximum RF gain Adjustable range Minimum RF gain !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 CW PITCH Increases · When functioning as squelch control (RF gain is fixed at maximum.) Noise squelch threshold (FM mode) Noise squelch (FM mode) S-meter squelch threshold S-meter squelch !1 ELECTRONIC CW KEYER SPEED CONTROL [KEY SPEED] (p. 28) Adjusts the internal electronic CW keyer's speed. · 6 wpm (min.) to 60 wpm (max.) can be set. Slow KEY SPEED Fast Squelch is open. !2 AUTO NOTCH/MANUAL NOTCH SWITCH [A/NOTCH] (p. 52) Toggles the notch function between manual and automatic when pushed. · "NOTCH" appears when manual; "A NOTCH" appears when automatic notch is selected. Shallow Deep While rotating the RF gain control, noise may be heard. This comes from the DSP unit and does not indicate an equipment malfunction. u MIC GAIN CONTROL [MIC GAIN] Adjusts microphone input gain. · The transmit audio tone in SSB, AM and FM modes can be adjusted in tone control set mode. (p. 88) !3 NOTCH CONTROL [NOTCH] (outer control; p. 52) Adjusts the notch filter frequency to remove an interfering signal. NR NOTCH Low frequency High frequency How to set the microphone gain. Set the [MIC] control so that the ALC meter sometimes swings during normal voice transmission in 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 MIC GAIN !4 ANTENNA SELECTOR SWITCH [ANT] (p. 74) Switches the antenna connector selection between ANT1 and ANT2 when pushed. !5 NOISE REDUCTION LEVEL CONTROL [NR] (inner control; p. 52) Adjusts the noise reduction level when the noise reduction is in use. Set for maximum readability. NR NOTCH Increases Decreases Increases i AF CONTROL [AF] (inner control) Varies the audio output level from the speaker. AF RF/SQL