Icom IC-78 Instruction Manual
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Icom IC-78 Instruction Manual

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INSTRUCTION MANUAL
HF TRANSCEIVER
i78
This device complies with Part 15 of the FCC rules. Operation is sub-
ject to the following two conditions: (1) This device may not cause
harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.

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  • Page 1 INSTRUCTION MANUAL HF TRANSCEIVER This device complies with Part 15 of the FCC rules. Operation is sub- ject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

  • Page 2: Explicit Definitions

    Other manufacturer’s microphones have different transceiver. This may result in an electric shock. pin assignments, and connection to the IC-78 may NEVER damage the transceiver. expose the transceiver to rain, snow or any liquids.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS IMPORTANT .............. i n VFO operation ..........34 EXPLICIT DEFINITIONS ..........i n 2-Tone alarm operation ........36 PRECAUTIONS ............i 7 INSTALLATION AND CONNECTIONS ..37– 38 1 TABLE OF CONTENTS ........1 n Opening the transceiver’s case ......37 SUPPLIED ACCESSORIES ........

  • Page 4: Panel Description

    PANEL DESCRIPTION n Front panel Speaker Function Display u IF SHIFT CONTROLS [SHIFT] q POWER SWITCH [PWR] (outer control; p. 20) ➥ Push momentarily to turn power ON. Shifts the center frequency of the receiver’s IF • Turn the optional DC power supply ON in advance. ➥...
  • Page 5 PANEL DESCRIPTION !3 ATTENUATOR SWITCH [ATT] (p. 19) @0 CALL SWITCH [CALL] Push to turn the 20 dB attenuator function ON and ➥ Push to select call channel. OFF. • Push again to return to previous condition. !4 TUNER SWITCH [TUNER] (p. 18) @1 MODE SWITCH [MODE] (p.

  • Page 6: Function Display

    PANEL DESCRIPTION n Function display i VFO/MEMORY INDICATOR q LOCK INDICATOR (p. 14) ➥ “MEMO” appears during regular operation. Appears when the dial lock function is in use. * This indicator appears only some versions. w RECEIVE INDICATOR ➥ “VFO” appears during VFO operation. Appears while receiving a signal or when the squelch is open.

  • Page 7: Rear Panel

    Accepts the control cable from an optional antenna i ALC INPUT JACK [ALC] tuner. Connects to the ALC output jack of a non-Icom lin- r REMOTE JACK [REMOTE] (p. 11) ear amplifier. For use with a personal computer for remote oper-...

  • Page 8: D Acc Socket Information

    PANEL DESCRIPTION D ACC SOCKET INFORMATION • ACC socket PIN # NAME DESCRIPTION SPECIFICATIONS Output voltage : 8 V ±0.3 V Regulated 8 V output. Output current : Less than 10 mA Connects to ground. — Input/output pin. Ground level : –0.5 V to 0.8 V SEND Goes to ground when transmitting.

  • Page 9: Microphone (Hm-36)

    PANEL DESCRIPTION n Microphone (HM-36) • MICROPHONE CONNECTOR • DESCRIPTION (Front view) i Main readout AF output (varies with [AF]) q Microphone input u GND (Microphone ground) w +8 V DC output y GND (PTT ground) e Frequency up/down t PTT r Main readout squelch switch [MIC] FUNCTION...

  • Page 10: Installation And Connections

    [GND] terminal and ground as short as the transceiver and antenna. Low SWR allows full possible. power for transmitting even when using the antenna tuner. The IC-78 has an SWR meter to monitor the antenna SWR continuously. R WARNING: NEVER connect the [GND] terminal to a gas or electric pipe, since the connec- tion could cause an explosion or electric shock.

  • Page 11: Required Connections

    INSTALLATION AND CONNECTIONS n Required connections • Front panel MICROPHONES (p. 45) HM-36 SM-20 or SM-6 • Rear panel ANTENNA DC POWER SUPPLY [Example]: 1.8–30 MHz bands AH-710 PS-125 GROUND (p. 8) CW KEY Use the heaviest gauge wire or strap available and make the connection as short as possible.

  • Page 12: Power Supply Connections

      power supply • The [PWR] switch is OFF. ating the IC-78 with AC power. Refer to the diagrams • Output voltage of the power source is 12–15 V below. when you use a non-Icom power supply. • DC power cable polarity is correct.

  • Page 13: Advanced Connections

    AT-130, or with AH-4 (p. 44) AH-2b or long wire ANTENNA Connects a linear amplifier, etc. ACC SOCKETS (p. 6) EXTERNAL SPEAKER (p. 44) [SEND], [ALC] Used for connecting a non-Icom linear ampli- fier. SP-21, etc.

  • Page 14: External Antenna Tuners

    INSTALLATION AND CONNECTIONS n External antenna tuners CONNECTING AN ANTENNA TUNER (p. 44) Long wire or optional AH-2b Coaxial cable (from the tuner) Control cable IC-78 AT-120/AT-130/AH-4 Ground Ground...

  • Page 15: Operation

    OPERATION n Selecting a channel The transceiver has 99 memory channels. However, the number of channels can be restricted in initial set mode (p. 32) depending on your needs. A total of 3 ways of channel selections are available to suit your operating style.

  • Page 16: Frequency Indication

    OPERATION n Frequency indication By pushing the [FC], channel comment indication or Push frequency indication can be selected. D Transmit frequency indication By pushing the [TXF], transmit frequency is indicat- ed, regardless channel comment or frequency indi- Channel indication cation. Push While transmit frequency is indicated, “...

  • Page 17: Basic Voice Receive And Transmit

    Release [PTT] to return to receive. • The S-meter shows signal strength when signal is received. n Mode selection The following modes are available in the IC-78: OPERATING MODE SELECTION SSB (LSB/USB), CW, CW REV (CW reverse), RTTY, MODE RTTY REV (RTTY reverse) and AM.

  • Page 18: Functions For Transmit

    OPERATION n Functions for transmit ï Output power and microphone gain • Setting output power • Setting microphone gain q Push [SET] for 1 sec. to select quick set mode. Microphone gain must be adjusted properly so that w Push [Z DN]/[UP Y] to select “RF POWER”. your signal does not distort when transmitted.

  • Page 19: Vox Operation

    OPERATION ï Microphone compressor IC-78 has a built-in, low distortion Mic compressor cir- e Confirm the ALC level. cuit. This circuit increases your average talk power in • Push [SET] to select the ALC meter. SSB mode and is especially useful when the receiv- •...
  • Page 20 OPERATION ï Optional AT-120/AT-130/AH-4 operation TUNER OPERATION The AT-120, AT-130 or AH-4 matches the IC-78 to a long wire antenna more than 7 m long (3.5 MHz (23 ft) Tuning is required for each frequency. Be sure to and above).

  • Page 21: Functions For Receive

    OPERATION n Functions for receive ï RIT function The RIT (Receive Incremental Tuning) function com- w To cancel the RIT function, RIT off position pensates for off-frequencies of communicating sta- rotate the RIT control to the tions. The function shifts the receive frequency up to center position.

  • Page 22: Meter Peak Hold

    OPERATION ï Meter peak hold The meter peak hold function freezes the highest dis- Initial reception of a signal played bar segment in any meter function for about results in an S-meter reading 0.5 sec. so that you can more easily read the meter. of 40 dB.

  • Page 23: Filter Selection

    OPERATION n Filter selection • Optional filter variations The filter selection switches the IF passband width as shown in the table at right. Name Band width Mode The filter selection is for temporal setting. FL-52A 500 Hz/–6 dB CW/RTTY-N FL-53A 250 Hz/–6 dB CW/RTTY-N q Select the desired mode programmed channel.

  • Page 24: Filter Setting

    OPERATION n Filter setting When an optional filter is installed, set the optional fil- ters in initial set mode. Optional filters are not select- ed by default. (p. 33) D Optional filter setting q While pushing and holding [SET], push [PWR] to enter initial set mode.

  • Page 25: Functions For Cw

    OPERATION n Function for CW ï Connection for CW Initial set mode setting (p. 32) 9 10 11 12 1 2 3 4 : normal [ELEC KEY] For no break-in operation: Paddle Connect an external switch such as [ACC] a foot switch; or use the RTTY : reverse SEND terminal for all bands.

  • Page 26: Cw Pitch Control

    CW mode (USB side) CW REV mode (LSB side) ï Electronic CW keyer The IC-78 has an electronic keyer. Both keying speed KEYING WEIGHT EXAMPLE: morse code “K” and weight (the ratio of dot : space : dash) can be set in quick set mode.

  • Page 27: Functions For Rtty

    OPERATION n Function for RTTY ï Connection for RTTY (FSK) Rear panel TU or TNC Personal computer ″ plug 2-conductor ⁄ ″ plugs. Use either the ACC or one of the two ⁄ Rear panel view SQL* AF out 9 10 11 12 SEND 5 6 7 8 Connect SQL line when required.
  • Page 28 OPERATION ï RTTY (FSK) operation q Connect a terminal unit as at p. 25. RTTY mode w Select RTTY (or RTTY-R) mode with [MODE]. is selected. e Select the desired FSK tone and shift frequencies as below. r Set the desired frequency with the channel se- lector.

  • Page 29: Channel Comment Programming

    OPERATION n Channel comment programming The IC-78 has a capability to assign up to 8-character channel comments for each operating channel. This provides easy recognition of channel usage, or station names, etc. • Channel comment programming example q Select the desired channel by pushing [√ DN]/ [UP ∫], rotating the channel selector, or using the...

  • Page 30: Set Mode

    SET MODE n General Set mode is used for programming infrequently changed values or conditions of functions. The IC-78 has 2 separate set modes: quick set mode and initial set mode. D Quick set mode operation q While power is ON, push [SET] for 1 sec.

  • Page 31: Quick Set Mode Items

    SET MODE n Quick set mode items • RF power This item adjusts the RF output power. The RF output power can be adjusted from L, 1 to 99 and H by indication, however, it can be adjusted continuously. •The default is H (maximum power). Note that while adjusting the output power, the power meter is displayed auto- matically.
  • Page 32 SET MODE n Quick set mode items — (continued) • BK-IN This item selects break-in type for CW operation. There are three selectable values: oF : No break-in operation available (default). SE : Semi break-in operation available. FL : Full break-in operation available •...

  • Page 33: Initial Set Mode Items

    SET MODE n Initial set mode items • RF/SQL control action Select [RF/SQL] control action from RF/squelch, automatic (acts as squelch in AM modes; as RF in SSB/CW/RTTY modes), or the squelch. (See p. 15) The default is Sq (squelch). •...
  • Page 34     level convert , rotate the main dial to select a different address for each IC-78 in the range 01H to 7FH. The default is 62. • CI-V Transceive Transceive operation is possible with the IC-78 connected to other Icom HF transceivers or receivers.

  • Page 35: Set Mode

    SET MODE n Initial set mode items — (continued) • OPTION Filter When an optional IF filer is installed, this selection is necessary, otherwise the filters cannot be selected. Selections available are FL-96, FL-222, FL-52A, FL- † 53A, FL-257 and none (default). See p. 21 for usable filters for each mode and see p.

  • Page 36: Extra Features

    EXTRA FEATURES n INTRODUCTION Extra features, explained in this section, are available only on some versions of the IC-78. Therefore, the instructions in this section are not necessary for some versions. n VFO operation D Entering VFO mode To enter VFO mode, push [FC] for 1 sec.

  • Page 37: Channel Programming

    EXTRA FEATURES D Channel programming The programmed frequencies, both transmit and re- ceive, in operating channel can be re-programmed from the VFO mode. • Simplex channel programming q Push [FC] for 1 sec. to enter VFO mode. w Push [√ DN]/[UP ∫] to select the desired channel. [ENT] •...

  • Page 38: N 2-Tone Alarm Operation

    EXTRA FEATURES D Channel clearing Note: If un-necessary channels are available, the stored Blank channels cannot be selected with frequency can be cleared. The cleared channels are [√ DN]/[UP ∫], and channel selector; can only skipped in the channel mode operation, be selected with the keypad.

  • Page 39: Dc Power Cable

    CAUTION: DISCONNECT the DC power cable from the IC-78 before performing any work on the transceiver. Otherwise, there is danger of electric shock and/or equipment damage. q Remove the 5 screws from the top of the transceiv- er and 4 screws from the sides, then lift up the top cover.

  • Page 40: Cr-338 High Stability Crystal Unit

    • Connect the frequency counter to P 2 (PLL unit). u Return the bottom cover to its original position. n Optional IF filters Several IF filters are available for the IC-78. You can e Install the de- Optional IF filter install 1 filter for 455 kHz IF.

  • Page 41: Maintenance

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

  • Page 42: Fuse Replacement

    CIRCUITRY FUSE REPLACEMENT The 13.8 V DC from the DC power cable is applied FGB 4 A to all units in the IC-78 through the circuitry fuse. This PA unit fuse is installed in the MAIN unit. q Remove the top cover as shown on p. 48 w Replace the circuitry fuse as shown in the diagram at right.

  • Page 43: Remote Jack Information

    9–15 V DC cations Interface-V (CI-V) controls the following func- tions of the transceiver. Personal Up to 4 Icom CI-V transceivers or receivers can be Computer connected to a personal computer equipped with an ct-17 RS-232C port. See p. 32 for setting the CI-V condition using set mode.

  • Page 44: Data Cloning Between Transceivers

    • Data cloning The IC-78’s data (programmed frequencies, channel comment, both quick and initial set mode conditions, etc.) can be copied to the other IC-78. This function is useful when exactly the same setting of the IC-78s is required. • Cloning operation q Turn power OFF.

  • Page 45: Specifications

    SPECIFICATIONS n GENERAL n TRANSMITTER • Frequency range • Modulation system 0.030000–29.999999 MHz* Balanced modulation 1.600000–29.999999 MHz* Low level modulation • Output power Guaranteed range: 0.5–29.999999 MHz SSB, CW, RTTY 2–100 W Not guaranteed for some frequency bands • Mode : USB, LSB, CW, RTTY, AM 2–35 W •...

  • Page 46: Options

    OPTIONS PS-125 DC POWER SUPPLY AT-130/E AUTOMATIC AH-4 AUTOMATIC ANTENNA ANTENNA TUNER TUNER Light weight switching regulator sys- Specially designed to tune a long wire tem power supply. Matches the transceiver to a long wire antenna for portable or mobile HF op- •...

  • Page 47: Options

    OPTIONS SM-6 DESKTOP MICROPHONE SM-20 DESKTOP MICROPHONE MB-23 CARRYING HANDLE Unidirectional, electret microphone for Electret condenser-type desktop mi- Carrying handle, convenient for porta- base station operation. Includes [UP]/ crophone. ble operation. [DOWN] switches and a low cut func- tion. IC-MB5 MOBILE MOUNTING CT-17 CI-V LEVEL CONVERTER BRACKET For remote transceiver control using a...
  • Page 48 A-5658H-1EX-e Printed in Japan © 2000–2008 Icom Inc. 1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003, Japan Printed on recycled paper with soy ink.

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