Icom IC-78 User Manual

INSTRUCTION MANUAL

HF TRANSCEIVER

i78

This device complies with Part 15 of the FCC rules. Operation is sub­ject 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.

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-78.

EXPLICIT DEFINITIONS

i

PRECAUTIONS

R WARNING HIGH VOLTAGE! NEVER at-

tach an antenna or internal antenna connector during
transmission. This may result in an electric 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 NEVERapply 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.

R NEVERlet 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.

During mobile operation, DO NOT operate the trans­ceiver without running the vehicle’s engine. When the
transceiver 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-78 may dam­age the transceiver.

WORD DEFINITION

R WARNING

Personal injury, fire hazard or electric
shock may occur.

CAUTION Equipment damage may occur.

NOTE

Inconvenience only. No risk of per of
personal injury, fire or electric shock.

1

1

TABLE OF CONTENTS

q

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e

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IMPORTANT .............................................................. i

EXPLICIT DEFINITIONS ........................................... i

PRECAUTIONS ........................................................ i

1 TABLE OF CONTENTS ....................................... 1

SUPPLIED ACCESSORIES ..................................... 1

2 PANEL DESCRIPTION ................................... 2 –7

■ Front panel ....................................................... 2

■ Function display ............................................... 4

■ Rear panel ........................................................ 5

■ Microphone (HM-36) ........................................ 7

3 INSTALLA TION AND CONNECTIONS ......... 8–12

■ Unpacking ........................................................ 8

■ Selecting a location .......................................... 8

■ Grounding ......................................................... 8

■ Antenna connection .......................................... 8

■ Required connections ....................................... 9

■ Power supply connections .............................. 10

■ Advanced connections .................................... 11

■ External antenna tuners ................................. 12

4 OPERATION................................................. 13–27

■ Selecting a channel......................................... 13

■ Frequency indication ....................................... 14

■ Lock function ................................................... 14

■ Scan function................................................... 14

■ Basic voice receive and transmit..................... 15

■ Mode selection ................................................ 15

■ RF gain and Squelch....................................... 15

■ Functions for transmit...................................... 16

■ Functions for receive....................................... 19

■ Filter selection ................................................. 21

■ Filter setting..................................................... 22

■ Functions for CW............................................. 23

■ Functions for RTTY ......................................... 25

■ Channel comment programming..................... 27

5 SET MODE ................................................... 28–33

■ General............................................................ 28

■ Quick set mode items...................................... 29

■ Initial set mode items....................................... 31

6 EXTRA FEATURES...................................... 34–36

■ Instruction........................................................ 34

■ VFO operation................................................. 34

■ 2-Tone alarm operation ................................... 36

7 INSTALLA TION AND CONNECTIONS........ 37–38

■ Opening the transceiver’s case ...................... 37

■ Optional bracket and carrying handle.............. 37

■ CR-338 HIGH STABILITY CRYSTAL UNIT ......... 38

■ Optional IF filters ............................................ 38

8 MAINTENANCE ........................................... 39–40

■ Troubleshooting .............................................. 39

■ Fuse replacement ........................................... 40

■ Resetting the CPU .......................................... 40

9 REMOTE JACK INFORMATION.................. 41–42

■ CI-V remote control ......................................... 41

■ Data cloning between transceivers ................. 42

10 SPECIFICATIONS ........................................... 43

12 OPTIONS .................................................. 44–45

SUPPLIED ACCESSORIES

The transceiver comes with the following accessories.

Qty.

q DC power cable.................................................... 1

w Hand microphone (HM-36) .................................. 1

e Fuse (FGB 20 A; for DC cable) ............................ 1

r Fuse (FGB 4 A; internal use) ............................... 1

■ Front panel

q POWER SWITCH [PWR]

➥Push momentarily to turn power ON.

•Turn the optional DC power supply ON in advance.

➥Push for 1 sec. to turn power OFF.
➥While pushing and holding [SET], push [PWR] to

enter the

initial set mode

. (p. 28)

w MICROPHONE CONNECTOR [MIC]

Accepts supplied or optional microphone.

•See p. 45 for appropriate microphones.

• See p. 7 for microphone connector information.

e HEADPHONE JACK [PHONES] (p. 11)

Accepts headphones.

• When headphones are connected, the internal
speaker or connected external speaker does not
function.

r AF CONTROL [AF] (inner control)

Varies the audio output level from the speaker.

t RF GAIN/SQUELCH CONTROL [RF/SQL]

(outer control; pgs. 15, 31)
Adjusts the squelch threshold level. The squelch re­moves noise output from the speaker (closed con­dition) when no signal is received.

•The squelch is available for all modes.

•The control can be set as the squelch plus RF gain
controls or squelch control only (RF gain is fixed at
maximum) in initial set mode.

y RIT CONTROL [RIT] (inner control; p. 19)

➥Shifts the receive frequency ±1.2 kHz for clear re-

ception of an off frequency signal.

• Rotate the control clockwise to increase the fre­quency, or rotate the control counterclockwise to
decrease the frequency. “ ” appears on the
display.

u IF SHIFT CONTROLS [SHIFT]

(outer control; p. 20)
Shifts the center frequency of the receiver’s IF
passband.

•Rotate the control clockwise to shift the center fre­quency higher, or rotate the control counterclock­wise to shift the center frequency lower.

i LOCK SWITCH [LOCK] (p. 14)

Push momentarily to turn the dial lock function ON
and OFF.

• The dial lock function electronically locks the chan-

nel selector.

o CHANNEL SELECTOR

Selects an operating channel, sets conditions in the
quick/initial set mode items, etc.

!0 PREAMP SWITCH [P.AMP] (p. 19)

Push to turn the preamp ON or OFF.

!1 FC SWITCH [CH]

➥Push to change the indication, channel comment

or stored frequency. (p. 14)

☛This key action only for some versions.
➥

Push for 1 sec. to entering into VFO mode. (p. 35)

!2 MEMORY CHANNEL UP/DOWN SWITCHES

[√ DN]/[UP ∫]

➥Push to select the operating channel. (p. 13)
➥Push for 1 sec. to start scanning. (p. 14)
➥Push to select the

quick/initial set mode

items

while

quick/initial set mode

is selected. (p. 28)

➥Push to select the digit of channel comment while

editing. (p. 27)

2

2

PANEL DESCRIPTION

PWR

Speaker

Function Display

@1 @0 !9

!7

!5

!4

!6

!3
!2

!0

!8

!1

o

iuytre

w

q

3

2

PANEL DESCRIPTION

!3 ATTENUATOR SWITCH [ATT] (p. 19)

Push to turn the 20 dB attenuator function ON and
OFF.

!4 TUNER SWITCH [TUNER] (p. 18)

➥Push to turn the antenna tuner function ON and

OFF.

➥Push for 1 sec. to manually tune the tuner.

• An optional antenna tuner must be connected.

• When the tuner cannot tune the antenna, the tun­ing circuit is bypassed automatically after 20 sec.

!5 SET SWITCH [SET]

➥Push for 1 sec. to enter the

quick set mode

.

(p. 28)

➥Push and hold [SET], then push [PWR] to enter

the

initial set mode

. (p. 28)

➥Push to change the meter function; (p. 16)

•PO: indicates the relative RF output power.

•ALC: Indicates ALC level.

•SWR: Indicates the SWR over the transmission
line.

!6 MIC COMPRESSOR SWITCH [COMP] (p. 17)

Turn the Mic. compressor function ON and OFF.

!7 KEYPAD

The keypad can be used for several functions as
described below:
➥[0] to [9]
— For entering operating channel number. (p. 13)
— Selects a character during channel comment

programming. (p. 27)
➥[ENT]
— Direct channel number input. (p. 13)
➥[TXF]
— Transmit frequency indication. (p.14)
— Selects a space and changes the editing digit

during channel comment programming. (p. 27)

!8 NOISE BLANKER SWITCH [NB] (p. 19)

➥Turns the noise blanker ON and OFF. The noise

blanker reduces pulse-type noise such as that
generated by automobile ignition systems. This
function is not effective against non pulse-type
noise.

➥Push [NB] for 1 sec. to enter the noise blanker

level setting condition.

!9 TONE SWITCH [TONE]

☛

This key action may differ according to version.

➥Selects the call channel and emits a distress

alarm tone from the speaker. (p. 36)

➥Transmits a distress alarm or alarm testing signal

when pushed for 1 sec. (p. 36)

•Cancel the distress alarm tone emission, or dis­tress alarm transmission.

➥Selects the tuning step item in the

quick set mode

directly.

➥No function is assigned.

@0 CALL SWITCH [CALL]

➥Push to select call channel.

•Push again to return to previous condition.

@1 MODE SWITCH [MODE] (p. 15)

Push to change an operating mode.

•Push [MODE] for 1 sec. during SSB mode to
switch between LSB or USB.

•Push [MODE] for 1 sec. during CW or RTTY
mode, to switch between CW and CW reverse or
RTTY and RTTY reverse. “ ” appears on the
display.

4

2

PANEL DESCRIPTION

■ Function display

q LOCK INDICATOR (p. 14)

Appears when the dial lock function is in use.

w RECEIVE INDICATOR

Appears while receiving a signal or when the
squelch is open.

e TUNE INDICATOR

➥Appears or disappears when the connected au-

tomatic tuner is tuned completely, depending on
connected antenna tuner type.

➥Flashes while tuning.

r TRANSMIT INDICATOR

➥Appears while transmitting.
➥Flashes while transmit frequency is indicated.

t ALARM INDICATOR

☛This indicator appears only some versions.

Appears while 2-tone alarm is emitting or transmit­ting

y FUNCTION INDICATORS

➥“P.AMP” appears when preamp is activated.
➥“ATT” appears when the RF attenuator is acti-

vated.

➥“NB” appears when the Noise Blanker is acti-

vated.

➥“BK” appears when the semi break-in function is

selected in

quick set mode

.

➥“F-BK” appears when the full break-in function

activates in CW mode. (p. 23)

➥“VOX” appears when the VOX function is se-

lected in

quick set mode

.

➥“COM” appears when the speech compressor ac-

tivates in SSB mode.

➥“SCAN” appears during scanning.

•Flashes when scan is paused.

u SIGNAL/SQL/RF-GAIN METER

➥Functions as an S-meter while receiving.
➥Functions as a Power, ALC or SWR meter while

transmitting. (p. 16)

i VFO/MEMORY INDICATOR

➥“MEMO” appears during regular operation.
☛This indicator appears only some versions.

➥“VFO” appears during VFO operation.

o CHANNEL NUMBER READOUT (p. 13)

Shows the selected channel number.

!0 BLANK INDICATOR

Appears when no frequency programmed channel
is selected.

!1 SPLIT INDICATORS (p. 13)

Appears when the duplex channel, in which differ­ent frequencies between transmit and receive are
programmed, is selected.

!2 RIT INDICATOR (p. 19)

Appears when the RIT function is in use.

!3 CHANNEL READOUT

Shows the memory names, or stored frequency of
the selected channel.

!4 REVERSE INDICATOR (p. 15)

Appears when the CW reverse or RTTY reverse
mode is selected.

!5 WIDE/NARROW FIL TER INDICATORS (pgs. 21, 22)

➥“ ” appears when the wide IF filter is selected.
➥“ ” appears when the narrow IF filter is se-

lected.

!6 MODE INDICATORS (p. 15)

Indicates the temporarily selected operating mode.

!6 !4

!5

u

oi

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w

!0

!3

!1

t
y

q

!2

5

2

PANEL DESCRIPTION

■ Rear panel

q ANTENNA TERMINAL [ANT] (p. 9)

Connects a 50 Ω antenna with a PL-259 connector
and a 50 Ω coaxial cable.

w DC POWER SOCKET [DC 13.8V] (p. 10)

Accepts 13.8 V DC through the supplied DC power
cable.

e TUNER CONTROL SOCKET [TUNER] (p. 11)

Accepts the control cable from an optional antenna
tuner.

r REMOTE JACK [REMOTE] (p. 11)

For use with a personal computer for remote opera­tion of transceiver functions, and data cloning be­tween transceivers.

t EXTERNAL SPEAKER JACK [EXT SP]

Connects an 8 Ω external speaker, if desired.

•When an external speaker is connected, the inter­nal speaker does not function.

y ACCESSORY SOCKET [ACC] (p. 6)

Enables connection to external equipment such as
a TNC for data communications or a linear ampli­fier, etc.

u ELECTRONIC KEYER JACK [KEY]

Accepts a paddle to activate the internal electronic
keyer.

• Selection between the internal electronic keyer
and straight key operation can be made in initial
set mode.

i ALC INPUT JACK [ALC]

Connects to the ALC output jack of a non-Icom lin­ear amplifier.

o SEND CONTROL JACK [SEND]

Goes to ground while transmitting to control exter­nal equipment such as a linear amplifier.

• Max. control level: 16 V DC/2 A

!0 GROUND TERMINAL [GND] (p. 9)

Connects the terminal to ground.

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rtyuio!0

Rear panel view

When connecting
a straight key

When connecting
a paddle

(dot)
(com)
(dash)

(⊕)

6

2

PANEL DESCRIPTION

DD

ACC SOCKET INFORMATION

• ACC socket

•When connecting the ACC conversion cable (OPC-599)

ACC PIN # NAME DESCRIPTION SPECIFICATIONS

1 8 V Regulated 8 V output.

Output voltage : 8 V ±0.3 V
Output current : Less than 10 mA

2 GND Connects to ground. —

Input/output pin.

Ground level : –0.5 V to 0.8 V

3 SEND Goes to ground when transmitting.

Input current : Less than 20 mA

When grounded, transmits.
4 BDT Data line. —
5 BAND Band voltage output.

6 ALC ALC voltage output.

Control voltage : –4 V to 0 V
Input impedance

: More than 10 kΩ
7NC — — —
8

13.8 V

13.8 V output when power is ON. Output current : Max. 1 A

9 TKEY Key line. —

10 FSKK RTTY key input.

Ground level : –0.5 V to 0.8 V
Input current : Less than 10 mA

11 MOD Modulation input.

Input impedance

: 10 kΩ

Input level : Approx. 100 mV rms

12 AF

AF detector output.

Output impedance

: 4.7 kΩ

Fixed, regardless of [AF] position. Output level : 100–300 mV rms

13 SQLS

Squelch output. SQL open : Less than 0.3 V/5 mA
Goes to ground when squelch opens.

SQL closed :

More than 6.0 V/100 µA

13

10 11 12

9

1234

Rear panel

view

8765

➀ FSKK ➄ AF
➁ GND ➅ SQLS

➂ SEND ➆ 13.8 V
➃ MOD ➇ ALC

➀ 8 V ➄ ALC
➁ GND ➅ NC

➂ SEND ➆ 13.8 V
➃ BAND

13

9

10 11 12

1122334

5

4

8877665

ACC 1

2

4

1

ACC 2

5

3

76

7

2

PANEL DESCRIPTION

■ Microphone (HM-36)

•DESCRIPTION

q UP/DOWN SWITCHES [UP]/[DN]

Change the selected readout frequency or memory
channel.

• Continuous pushing changes the frequency or
memory channel number continuously.

• The [UP]/[DN] switch can simulate a key paddle.
Preset in the CW P ADDLin initial set mode. (p. 32)

w PTT SWITCH

Push and hold to transmit; release to receive.

•MICROPHONE CONNECTOR

(Front view)

CAUTION: DO NOT short pin 2 to ground as this

can damage the internal 8 V regulator.

q

w

y GND (PTT ground)

t PTT

r Main readout squelch switch

q Microphone input

w +8 V DC output

e Frequency up/down

u GND

(Microphone ground)

i Main readout AF output

(varies with [AF])

•HM-36 SCHEMATIC DIAGRAM

+

+

q

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ert

y

u

i

4700 p

4700 p

10 µ

0.33 µ

MICROPHONE

MIC
ELEMENT

2 k

470

DOWN UP

PTT

RECEIVE
TRANSMIT

MICROPHONE CABLE MICROPHONE PLUG

[MIC]

FUNCTION DESCRIPTION

Pin No.

w +8 V DC output Max. 10 mA

e

Frequency up Ground
Frequency down Ground through 470 Ω

r

Squelch open “Low” level
Squelch closed “High” level

3

8

INST ALLATION AND CONNECTIONS

■ Antenna connection

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 feed
line. 1.5:1 or better of Voltage Standing W ave Ratio (VSWR)
is recommended for your desired band. Of course, the trans­mission line should be a coaxial cable.

CAUTION: Protect your transceiver from lightning

by using a lightning arrestor.

■ Unpacking

After unpacking, immediately report any damage to the
delivering carrier or dealer. Keep the shipping cartons.

For a description and a diagram of accessory equip­ment included with the IC-78, see ‘Supplied acces­sories’ on p. 1 of this manual.

■ Selecting a location

Select a location for the transceiver that allows ade­quate air circulation, free from extreme heat, cold, or
vibrations, and away from TV sets, TV antenna ele­ments, radios and other electro-magnetic sources.

The base of the transceiver has an adjustable stand
for desktop use. Set the stand to one of two angles de­pending on your operating conditions.

■ Grounding

To prevent electrical shock, television interference
(TVI), broadcast interference (BCI) and other prob­lems, ground the transceiver through the GROUND
terminal on the rear panel.

For best results, connect a heavy gauge wire or strap
to a long earth-sunk copper rod. Make the distance be­tween the [GND] terminal and ground as short as pos­sible.

R WARNING: NEVERconnect the [GND]

terminal to a gas or electric pipe, since the connec­tion could cause an explosion or electric shock.

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 transis­tor. 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-78 has an SWR meter to monitor the
antenna SWR continuously.

PL-259 CONNECTOR INSTALLATION EXAMPLE

30 mm ≈9⁄8 in 10 mm ≈3⁄8 in 1–2 mm ≈1⁄16 in

q

Coupling ring

w

e

30 mm

10 mm (soft solder)

10 mm

Soft
solder

1–2 mm

solder solder

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.

r

Screw the coupling
ring onto the
connector body.

9

3

INST ALLA TION AND CONNECTIONS

■ Required connections

PWR

MICROPHONES (p. 45)

SM-20

or SM-6,
SM-8

HM-36

GROUND (p. 8)

Use the heaviest gauge wire
or strap available and make
the connection as short as
possible.

Grounding prevents electrical
shocks, TVI and other
problems.

ANTENNA
[Example]: 1.8–30 MHz bands

DC POWER SUPPLY

PS-85

CW KEY

A straight key can be used when the
internal electronic keyer is turned
OFF in “CW PADDL” in

initial set

mode

. (p. 32)

AH-710

•Front panel

•Rear panel

10

3

INST ALLA TION AND CONNECTIONS

■ Power supply connections

Use an optional PS-85

DC POWER SUPPLY

when operat-

ing the IC-78 with AC power. Refer to the diagrams
below.

CAUTION:

Before connecting the DC power cable,

check the following important items. Make sure:

•The [PWR] 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.

Red : positive + terminal
Black : negative _ terminal

CONNECTING A VEHICLE BATTERY

NEVER connect to

a 24 V battery.

NOTE: Use terminals for
the cable connections.

CONNECTING NON-ICOM DC POWER SUPPLY

CONNECTING PS-85 DC POWER SUPPLY

DC power
socket

DC power cable

DC power
socket

PS-85

Connect to an AC outlet
using the supplied AC cable.

DC power supply

13.8 V 20 A

_

+

AC outlet

AC cable

Grommet

Supplied
DC power cable

_ black

_

black

12 V
battery

20 A fuses

Supplied
DC power cable

+

red

+ red

Crimp

Solder

3

INST ALLA TION AND CONNECTIONS

11

■ Advanced connections

PWR

MIC

The AFSK modulation signal can be
input from [MIC]. (p. 25)

HEADPHONES

•Front panel

ANTENNA

Connects a linear amplifier, etc.

[REMOTE] (pgs. 41, 42)
Used for computer control and transceive operation,
and cloning operation between transceivers.

[SEND], [ALC]
Used for connecting a
non-Icom linear ampli­fier.

EXTERNAL SPEAKER (p. 44)

SP-21, etc.

ACC SOCKETS (p. 6)

AT-120,
AT-130, or
AH-4 (p. 44)

AH-2b

or long wire

with

•Rear panel

3

INST ALLA TION AND CONNECTIONS

12

■ External antenna tuners

CONNECTING AN ANTENNA TUNER (p. 44)

Coaxial cable (from the tuner)

Long wire or optional AH-2b

Control cable

Ground

IC-78

Ground

AT-120/AT-130/AH-4

4

OPERATION

13

■ 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.

D Using the channel selector

Rotate the channel selector clockwise (channel num­ber increases) or counterclockwise (channel number
decreases) to select desired channel.

This is the most useful way of channel selection.

D Using up/down switches

Push [√ DN]/[UP ∫] on the front panel or the micro­phone to select the desired channel.

This way is convenient when changing a small num­ber of channels.

• When a duplex channel (different frequencies be-

tween transmit and receive) is selected, “ ” ap­pears.

D Using the keypad

Enter the number of the desired channel number using
the keypad (0 to 9), then push [ENT].

This way is convenient for remembering the usage and
stored channel number, or when changing large a
number of channels.

• When a duplex channel (different frequencies be-

tween transmit and receive) is selected, “ ” ap­pears.

• When a blank channel (no frequency is programmed)

is selected, “ ” appears.

Channel 1

Channel 2

Channel 99

Rotate the
channel selector

Push [√ DN]/[UP ∫]
switch

to select a
channel

or

• Example 1— selecting channel 8

Push

Push

Push Push

Blinks

• Example 2— selecting channel 25

Push

Blinks

Blinks

4

OPERATION

14

■ Frequency indication

By pushing the [FC], channel comment indication or
frequency indication can be selected.

D Transmit frequency indication

By pushing the [TXF], transmit frequency is indicated,
regardless channel comment or frequency indication.

While transmit frequency is indicated, “ ” flashes.

■ Lock function

The lock function electronically locks the main dial to
prevent accidental channel changing.

Push [LOCK] to turn the lock function ON and OFF.
Before channel selection, turn this function OFF.

■ Scan function

Scan function repeatedly scans programmed chan­nels. This function is convenient to wait for calls on
multiple channels.

q Set [RF/SQL] control at the center (12 o’clock) po-

sition (opening squelch), then rotate [RF/SQL]
control clockwise to the position where the noise
disappears.

w Push [√ DN] or [UP ∫] for 1 sec. to start channel

scan.

• The “SCAN” indicator appears.

e When a signal is received, channel scan pauses

on that channel.

r Push [√ DN] or [UP ∫] to cancel channel scan.

NOTE: The scan resume condition (the action
after signal receiving) can be selected as “scan re­sume” or “scan cancel” in the

initial set mode

(p. 31).

Push

Channel indication

Push

Frequency indication

Push

Flashes

Transmit frequency indication

ch 2 ch 3 ch 4

ch 1

BLANK

ch 99

Shallow

Squelch control

BLANK

ch 5

ch 6ch 7

Recommended
position

Deep

Appears while lock function is activated.

[√ DN]/[UP ∫]
switches

Appears while
scanning.

15

4

OPERATION

■ Mode selection

The [RF/SQL] control adjusts either the RF gain or
the squelch. The action depends on the operating
mode and the condition of the RF/SQL item in

initial

set mode

(p. 31).

•[RF/SQL] control priority

* The RF gain is set to maximum level when the [RF/SQL]

is set as [SQL] control.

The

RF gain

is used to adjust the receiver gain.

•Shallow rotation moves the S-meter to the right indicating
the signal strength which can be received.

The recommended position for RF gain is the 12
o’clock position since this sets RF gain to the max.

The

SQUELCH

removes noise output from the
speaker (closed condition) when no signal is received.
The squelch is available for the other modes.

•Asegment appears in the S-meter to indicate the S-meter

squelch level.

•When set as the [RF/SQL] control

•When set as the [SQL] control

•When set as the [RF] control

■ RF gain and Squelch

Set mode setting SSB, CW, RTTY AM

rS (RF/SQL) RF/SQL RF/SQL

At (Auto) RF gain SQL*

Sq (SQL)

SQL* SQL*

(default)

■ Basic voice receive and transmit

q Check the following in advance:

➥ Microphone is connected.
➥ [AF] control is set to minimum position.
➥ [RF/SQL] is set to center position (squelch open).
➥ [RIT] control set to center position.

w

Selects the desired channel to be received with the
channel selector, [√ DN]/[UP ∫], or 10-key pad.

•

The S-meter shows signal strength when signal is received.

e Adjust [AF] to the desired audio level when receiv-

ing a signal.

r Push [MODE] to select the desired operation mode,

if the received signal is in a different mode.

t If the bass or treble of the receive audio is too

strong, rotate [RIT] control to obtain clear audio.
(p. 19)

y

Push [TUNER] to tune the antenna tuner, if connected.

• “TUNE” indicator flashes for 1 to 2 sec. for the first tun­ing on a channel.

u Push and hold [PTT] on the microphone, and speak

into the microphone at a normal voice level.

• The RF meter shows the output power according to your
voice level, when RF power meter is selected.

i Release [PTT] to return to receive.

[

RIT

]

[AF]
[RF/SQL]

Microphone
connector

The following modes are available in the IC-78:
SSB (LSB/USB), CW, CW REV (CW reverse), R TTY,
RTTY REV (RTTY reverse) and AM.

➥ Push [MODE] to select desired operation mode.
➥ Push [MODE] for 1 sec. to change between USB

and LSB, CW and CW reverse or RTTY and RTTY
reverse. (SSB, CW and RTTY mode only)

•The selected mode is indicated in the function display.

Note: The selected mode can be used for temporary

operation only.

OPERATING MODE SELECTION

USB LSB

CW CW

RTTY RTTY

AM

Maximum RF gain

Squelch is open.
RF gain adjustable

range

Squelch is open.

Shallow Deep

Maximum RF gain

Adjustable range

Minimum RF gain

MODE

Push
momentarily

MODE

Push
for 1 sec.

S-meter squelch
threshold

S-meter squelch

S-meter squelch
threshold

S-meter squelch

16

4

OPERATION

ï Meter function

The bar meter in the function display acts as an S­meter (for relative signal strength) during receive and
can be selected for one of three functions during
transmit.

• Push [SET] to select the PO, ALC and SWR meter
mode.

• Measuring SWR

q Confirm that the output power is over 30 W.
w Push [SET] to select the SWR meter.
e Push [MODE] to select CW or RTTY operation.

•Key down or push [PTT] to transmit; then read the ac­tual SWR from the meter:

≤1.5; well matched antenna
≥1.5; check antenna or cable connection, etc.

Display

Measurement

Indication

PO Indicates the relative RF output power.

ALC

Indicates the ALC level. When the meter
movement shows the input signal level ex­ceeds the allowable level, the ALC limits the
RF power. In such cases, reduce the micro­phone gain (see above).

SWR Indicates the SWR over the transmission line.

■ Functions for transmit

ï Output power and microphone gain

•Setting output power

q Push [SET] for 1 sec. to select

quick set mode

.

w Push [∫ UP]/[√ DN] to select “RF POWER”.
e Rotate the main dial to select the desired output.

•Output power is displayed in 101 steps (L, 1–99 and H)
but is continuously selectable.

•Available power
SSB/CW/RTTY: 2 (or less) to 100 W
AM: 2 (or less) to 40 W*

*Carrier power

Maximum output
power is selected.

•Setting microphone gain

Microphone gain must be adjusted properly so that
your signal does not distort when transmitted.

q Select SSB or AM mode.
w Push [SET] for 1 sec. to enter the quick set mode.
e Push [∫ UP]/[√ DN] to select “MIC GAIN”.
r Adjust the mic gain while speaking into the micro-

phone, so that the ALC meter does not exceed the
ALC zone.

t Push [SET] to exit

quick set mode

.

Microphone gain
is set to 50.

ALC zone

The best match is in this range.

17

4

OPERATION

ï Microphone compressor

IC-78 has a built-in, low distortion Mic compressor
circuit. This circuit increases your average talk power
in SSB mode and is especially useful when the re­ceiving station is having difficulty copying your signal.

q Select USB or LSB mode.
w Push [COMP] switch to turn mic compressor ON.

•“COM” indicator appears.

e Confirm the ALC level.

•Push [SET] to select the ALC meter.

•Speak into the microphone at a normal voice level.

•If the ALC meter peak past the ALC zone, re-adjust the
mic. gain. (p.16)

•Be sure the mic gain is in the range of 20 to 50.

Note: When the ALC meter peaks above the ALC

zone, your transmitted voice may be distorted.

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.

q Select “VOX” in

quick set mode

.

•Push [SET] for 1 sec. to select

quick set mode

.

•Push [∫ UP]/[√DN] to select “VOX”.

w Rotate the channel selector to turn VOX function

ON.

e Select “VOX GAIN” in

quick set mode

.

•Push [∫ UP]/[√DN] to select “VOX”.

r While speaking into the microphone, adjust [VOX

GAIN] with the channel selector, until the trans­ceiver is transmitting.

t Select “VOX DELY” in

quick set mode

.

•Push [∫ UP]/[√DN] to select “VOX Delay”

t While speaking into the microphone, adjust [VOX

DELY] as desired.

y Select “ANTI-VOX” in

quick set mode

.

• Push [∫ UP]/[√ DN] one or more times to select “AN
VOX”

u If the receive audio from the speaker switches the

transceiver to transmit during receive, adjust the
“ANTI-VOX” to the point where it has no effect.

i Push [SET] to exit

quick set mode

.

ï VOX operation

Rotate the
channel selector

ONOFF

[COMP] switch

Adjust [MIC GAIN] so that the ALC
meter reads within the ALC zone.

ALC zone

Appears when
mic compressor
is activated.

18

4

OPERATION

The AT-120, AT-130 or AH-4 matches the IC-78 to a
long wire antenna more than 7 m (23 ft) long (3.5 MHz
and above).

• See p. 11 for connection.

• See the connected antenna tuner’s instruction man­ual for installation and antenna connection details.

• Setting example:

NEVER operate the AT-120, AT-130 or AH-4 without

an antenna wire. The tuner and transceiver will be
damaged.

NEVER operate the AT-120, AT-130 or AH-4 when it
is ungrounded.

Transmitting before tuning may damage the trans­ceiver. Note that the AT-120, AT-130 or AH-4 cannot
tune when using a 1⁄2 λ long wire or multiple of the op­erating frequency.

TUNER OPERATION

•Tuner type setting (p. 32)

q Push [PWR] for 1 sec. to turn power OFF.
w Enter

initial set mode

.

• Turn power ON while pushing and holding [SET].

e Push [UPY] or [Z DN] to select [TUNER].
r Selects connected antenna tuner type by rotating

the channel selector.

• no : no antenna tuner is selected.

• 4 : AH-4 is selected.

• 12 : AT-120 is selected.

• 13 : AT-130 is selected.

y Push [PWR] for 1 sec. to turn power OFF.
u Push [PWR] to turn power ON again.

• MANUAL TUNING

q Set the desired channel.
w Push [TUNER] to start tuning.

• “ ” blinks and “CW” appears while tuning.

e “”lights constantly when tuning is completed.

(except when AT-120 is connected; the indicator

goes out)

• When the connected wire cannot be tuned, the “ ”
goes out, the antenna tuner is bypassed and the an­tenna wire is connected to the antenna connector on

the transceiver directly.

r To bypass the antenna tuner manually, push

[TUNER]. (AH-4 only; starts tuning again when AT­120 or AT-130 is connected)

For mobile operation

For outdoor operation

Long wire

Optional AH-2b
antenna element

MIC

IC-718

PHONES

SQL AFSHIFT RIT

LOCK

MODE

FILTER

TS

PWR

TUNER

∫

∫

COMP

P.AMP

UP

NB

ATT

SET

CH

DN

ENT

F-INP

V/M

1

MW

4

A=B

2

M=CL

5

SCN

8

ANF

0

NR

.

A/B

3

VOX

97

SPL

M V

6

▲



AT-120
AT-130
AH-4

RR

WARNING: HIGH VOLTAGE!

NEVER touch the antenna element while tuning or

transmitting.

Tuning is required for each frequency. Be sure to
re-tune the antenna before transmitting when you
change the frequency— even slightly.

ï Optional A T -120/AT -130/AH-4 operation

Tuning indicator;
Blinks: While tuning
Appears: Tune is completed
Disappears: Tune is not completed
(When AT-120 is connected, the

indicator disappears even when
tuned completely.)

[TUNER] switch

4

OPERATION

19

■ Functions for receive

ï RIT function

The RIT (Receive Incremental Tuning) function com­pensates for off-frequencies of communicating sta­tions. The function shifts the receive frequency up to

1.2 KHz without moving the transmit frequency.
q Rotate the RIT control to cancel the off-frequen-

cies.

•“ ” appears on the display.

•The transmit frequencies are not shifted.

w To cancel the RIT function,

rotate the RIT control to the
center position.

•“ ” disappears.

ï Preamp

The preamp amplifies received signals in the front
end circuit to improve the S/N ratio and sensitivity.
Turn this function ON when receiving weak signals.

➥ Push [P.AMP] to turn the the preamp ON and OFF.

• Preamp functions below 1.6 MHz, but sensitivity may
be reduced in some cases.

ï Attenuator

The attenuator prevents desired signals from distort­ing when very strong signals are near the desired fre­quency or when very strong electric fields, such as
from broadcasting stations, are near your location.

➥ Push [ATT] to turn the 20 dB attenuator function

ON and OFF.

•“ATT” appears when the attenuator is turned ON.

ï Noise blanker

The

noise blanker

reduces pulse-type noise such as
that generated by automobile ignition systems.
q Push the [NB] switch to turn the noise blanker ON.

• [NB] indicator appears.

w Push the [NB] for 1 sec. to enter the noise blanker

level setting condition.

e Rotate the channel selector to adjust the noise

blanker level.

r Push [NB] to exit the setting condition.
t Push [NB] again to turn the noise blanker function

OFF.

• [NB] indicator disappears.

• When using the noise blanker, received signals
may be distorted if they are excessively strong.

• The noise blanker function in AM mode can be

deactivated depending on

initial set mode

setting.

(p. 31)

RIT off position

Appears when the
preamp is ON.

Appears when the
attenuator is ON.

[NB] switch

Appears when the
noise blanker is ON.

20

ï Meter peak hold

The meter peak hold function freezes the highest dis­played bar segment in any meter function for about

0.5 sec. so that you can more easily read the meter.
This function can be turned ON and OFF in

initial set

mode

. (p. 31)

The IF shift function electronically narrows the pass­band frequency of the IF (intermediate frequency)
and cuts out higher or lower frequency components
of the IF to reject interference. The function shifts the
IF frequency up to ±1.2 KHz in SSB/CW/RTTY
modes and up ±250 Hz in CW-narrow/RTTY narrow
modes. The IF shift is not available in AM mode.

IF SHIFT OPERATION EXAMPLE

•Adjust the [SHIFT] control for a minimum interfer­ence signal level.

• When IF shift is used, the audio tone may be
changed.

•Set the IF shift control to its center position when
there is no interference.

g

ï IF shift function

4

OPERATION

Both controls at
center position

SHIFT SHIFT

Cutting a lower
passband

Initial reception of a signal
results in an S-meter reading
of 40 dB.

The highest indicated bar
remains displayed for 0.5 sec.
even when the signal strength
decreases.

Cutting higher
passbands

SHIFT

IF center frequency

Interference

Desired signal

Passband

Desired si

Passband

Interference

nal

21

4

OPERATION

■ Filter selection

The filter selection switches the IF passband width as
shown in the table at right.

The filter selection is for temporal setting.
q Select the desired mode programmed channel.

(p. 13)

w Push [SET] for 1 sec. to enter

quick set mode

.

e Push [UPY] or [ZDN] several times until “FILTER”

appears on the display.

r Rotate the channel selector to select desired pass-

band width.

• Either “ ” or “ ” does not appear while the nor­mal filter is selected.

•“ ” appears when the wide filter is selected.

•“ ” appears when the narrow filter is selected.

t Push [SET] to exit

quick set mode

.

•Optional filter variations

When an optional filter is installed, set the optional
filter in

initial set mode

. An optional filter is not se-

lected by default.

Name Band width Mode

FL-52A 500 Hz/–6dB CW/RTTY-N
FL-53A 250 Hz/–6dB CW/RTTY-N

FL-96 2.8 KHz/–6dB SSB-W
FL-222 1.8 KHz/–6dB SSB-N
FL-257 3.3 KHz/–6dB SSB-W

•Filter construction (Rx)

•Filter selection table
no FL-52A FL-53A FL-96 FL-222 FL-257

WIDE 6 kHz* 6 kHz* 6 kHz*

6 kHz*

6 kHz*

6 kHz*

SSB

2.8 kHz 3.3 kHz

NORMAL 2.4 kHz 2.4 kHz 2.4 kHz 2.4 kHz 2.4 kHz 2.4 kHz

NARROW — 500 Hz* 250 Hz* — 1.8 kHz* —

WIDE 6 kHz* 6 kHz* 6 kHz*

6 kHz*

6 kHz*

6 kHz*

CW

2.8 kHz 3.3 kHz

NORMAL 2.4 kHz 2.4 kHz 2.4 kHz 2.4 kHz 2.4 kHz 2.4 kHz

NARROW — 500 Hz 250 Hz — 1.8 kHz —

WIDE 6 kHz* 6 kHz* 6 kHz*

6 kHz*

6 kHz*

6 kHz*

RTTY

2.8 kHz 3.3 kHz

NORMAL 2.4 kHz 2.4 kHz 2.4 kHz 2.4 kHz 2.4 kHz 2.4 kHz

NARROW — 500 Hz 250 Hz — 1.8 kHz —

WIDE — — — — — —

AM

NORMAL 6 kHz 6 kHz 6 kHz 6 kHz 6 kHz 6 kHz

NARROW 2.4 kHz

2.4 kHz 2.4 kHz 2.4 kHz 2.4 kHz 2.4 kHz

500 Hz* 250 Hz* 2.8 kHz* 1.8 kHz* 3.3 kHz*

*Can be used when the expanded filter selection is turned on in the

initial set mode

. (see next page)

2nd IF signal

CFWS450HT (6 kHz)*

3

Through

FL-65 (2.4 kHz)*

FL-257 (3.3 kHz)*

FL-96 (2.8 kHz)*
FL-222 (1.8 kHz)*
FL-52A (500 Hz)*
FL-53A (250 Hz)*

1

2

2

2
2
2

2nd IF signal/DET

1

AM; Narrow,

*
SSB/CW/RTTY; Normal

2

*

OPTION

3

*

AM; Normal,

SSB/CW/RTTY; Wide

22

4

OPERATION

When an optional filter is installed, set the optional fil­ters in

initial set mode

. Optional filters are not se-

lected by default. (p. 33)

D Optional filter setting

q While pushing and holding [SET], push [PWR] to

enter

initial set mode

.

w Push [UPY] or [ZDN] several times until “FIL” ap-

pears on the display.

e Rotate the channel selector to select the installed

filter.

•“no,” “52A,” “53A,” “96,” “222” and “257” indicate no op­tional filter, FL-52A, FL-53A, FL-96, FL-222 and
FL-257, respectively for 455 kHz IF filter selection.

r Push [PWR] for 1 sec. to exit

initial set mode

.

D Expanded filter selection

The selectable filter combinations can be expanded
by setting the expanded filter selection to ON. Then
extra wide or narrow filter can be selected on desired
mode.

q While pushing and holding [SET], push [PWR] to

enter

initial set mode

.

w Push [UPY] or [Z DN] several times until “EXP

FIL” appears.

e Rotate the channel selector to turn the expanded

filter selection ‘on’.

•If ‘on’ is selected, the expanded filter selection can be
used.

•Wide/narrow filter selection
r Push [UP Y] several times until

“WIDE ✻✻” or “NAR ✻✻” appears
on the display.

t Push [MODE] several times to se-

lect the desired mode.

y Rotate the channel selector to se-

lect a filter.

u Repeat steps t and y to select

IF filters for other modes, if de­sired.

• The filter combinations are stored
depending on operating modes.

i Push [PWR] for 1 sec. to exit

ini-

tial set mode

.

■ Filter setting

•Narrow filter setting table

•Wide filter setting table

no FL-52A FL-53A FL-96 FL-222 FL-257

SSB

no no no

96 (2.8 kHz)

no

257 (3.3 kHz)

THU (6 kHz) THU (6 kHz) THU (6 kHz) THU (6 kHz) THU (6 kHz) THU (6 kHz)

CW

no no no

96 (2.8 kHz)

no

257 (3.3 kHz)

THU (6 kHz) THU (6 kHz) THU (6 kHz) THU (6 kHz) THU (6 kHz) THU (6 kHz)

RTTY

no no no

96 (2.8 kHz)

no

257 (3.3 kHz)

THU (6 kHz) THU (6 kHz) THU (6 kHz) THU (6 kHz) THU (6 kHz) THU (6 kHz)

AM

——————

: default

no FL-52A FL-53A FL-96 FL-222 FL-257

SSB

—nono

— 222 (1.8 kHz)

—

52A (500 Hz) 53A (250 Hz)

CW

—

52A (500 Hz) 53A (250 Hz) — 222 (1.8 kHz)

—

RTTY

—

52A (500 Hz) 53A (250 Hz) — 222 (1.8 kHz)

—

AM

NOR (2.4 kHz) NOR (2.4 kHz) NOR (2.4 kHz) NOR (2.4 kHz) NOR (2.4 kHz) NOR (2.4 kHz)

52A (500 Hz) 53A (250 Hz) 96 (2.8 kHz) 222 (1.8 kHz)

257 (3.3 kHz)

: default

23

4

OPERATION

■ Function for CW

ï Connection for CW

1234

8765

9

10 1112

13

Paddle

[ELEC KEY]

[MICROPHONE]

See p. 25 for connection details:
Paddle operation from front panel
MIC connector.

Straight key

Microphone

Initial set mode

setting (p. 32)

4

8

12

[ACC]

123

765

9

10 11

13

For no break-in operation:

Connect an external switch such as

a foot switch; or use the RTTY

SEND terminal for all bands.

(See p. 25)

: normal

: reverse

: off

: UP/DN key

ï CW operation

q Connect a paddle or straight key as above.
w Select CW (or CW-REV) programmed channel.
e Set CW break-in operation as semi break-in, full

break-in or OFF. (see p. 30)

• Push [SET] for 1 sec. to enter

quick set mode

.

• Push [UPY] or [ZDN] several times until “BK-IN” ap-

pears, then rotate the channel selector to select the
desired condition:

FL: full break-in
SE: semi break-in
oF: no break-in

r Set the CW delay time when semi break-in opera-

tion is selected. (see p. 30)

• Push [SET] for 1 sec. to enter

quick set mode

; push
[UP Y] or [ Z DN] several times until “BK-DELAY” ap­pears, then rotate the channel selector to select the de­sired delay time.

CW mode and semi
break-in operation
is selected.

Delay time of 6 dots
is selected in quick
set mode for semi
break-in operation.

4

OPERATION

24

ï CW pitch control

The received CW audio pitch and monitored CW
audio pitch can be adjusted to suit your preferences
(300 to 900 Hz) without changing the operating fre­quency.

q Push [SET] for 1 sec. to enter quick set mode.
w Push [∫ UP]/[√ DN] one or more times until “CW

PITCH” appears, then rotate the main dial to set
the desired pitch. (p. 29)

ï CW reverse mode

The CW-R (CW Reverse) mode receives CW signals
with a reverse side CW carrier point like that of LSB
and USB modes. Use this mode when interference
signals are near the desired signal and you want to
change the interference tone.

q Push [MODE] one or more times to select CW

mode.

w Push [MODE] for 1 sec. to switch between CW and

CW-R modes.

ï Electronic CW keyer

The IC-78 has an electronic keyer. Both keying speed
and weight (the ratio of dot : space : dash) can be set
in

quick set mode

.

•Setting the electronic keyer

q Push [MODE] one or more times to select CW

mode.

w While pushing and holding [SET], push [PWR] to

enter

initial set mode

.

e Push [∫ UP]/[√ DN] one or more times until “CW

PADDL” appears, then rotate the main dial to se­lect the paddle type.

• When “ud” is selected, the up/down switches on the mi­crophone can be use as a paddle.

• When using up/down switches as a paddle, squeeze
keying function is not available.

r Push [∫ UP]/[√ DN] one or more times until “KEY

RAT” appears, then rotate the main dial to select
the desired weight.

• Key weight can be selected from 2.8 to 4.5.

t Push [∫ UP]/[√ DN] one or more times until “KEY

SPD” appears, then rotate the main dial to select
the desired weight.

• Key weight can be select from 6 to 60.

Paddle operation from front panel MIC connector

Connect a CW paddle as at right to operate an elec­tronic keyer from the front panel MIC connector.

•This function is available from the front panel mic con­nector only.

• Be sure to select item “n,”“r,”or “oF” in CW PADDL in

initial set mode.

•Connect straight key to “DOT” side.

This shows the
default setting for
the CW pitch control
(600 Hz).

BFO

Desired signal
(600 Hz)

CW mode (USB side)

Interference
(800 Hz)

1/3 octave

Push for 1 sec.

MODE

Desired signal
(600 Hz)

CW REV mode (LSB side)

1/2 octave

BFO

Interference
(400 Hz)

KEYING WEIGHT EXAMPLE: morse code “K”

DOT

DASH

(Fixed*)

Weight setting:
1:1:3 (default)

Weight setting:
Adjusted

Adjustable range SPACE (Fixed*)

*SPACE and DOT length can be adjusted with “KEY SPD
in the quick set mode only.

Paddle operation

DOT

CW
paddle

DASH

3.9 kΩ ±5%

2.2 kΩ ±5%

DASH

MIC U/D

front panel
MIC connector

yY

eY

E

4

OPERATION

25

■ Function for RTTY

ï Connection for RTTY (FSK)

Rear panel

TU or TNC

Personal computer

Rear panel
view

Use either the ACC or one of the two

1

⁄8″ plugs.

*

1

Connect SQL line when required.

SQL*

1

AF out
SEND
GND
FSKK

GND

AF

2-conductor

1

⁄8″ plug

[ACC]

[EXT SP]

1234

5678

9101112

13

ï Connection for AFSK

To a TU or TNC
and personal computer.

Use either the ACC or microphone connector.

SQL*

1

AF out
AF in

SEND
GND

1234

5678

9101112

13

Rear panel
view

*

1

Connect SQL line when required.

q Mic input

[MIC] connector

(Front panel view)

1

2

345

678

i AF output

u Mic GND

y PTT GND

t PTT

r SQL

[ACC] connector

4

OPERATION

26

ï RTTY (FSK) operation

q Connect a terminal unit as at p. 25.
w Select RTTY (or RTTY-R) mode with [MODE].
e Select the desired FSK tone and shift frequencies

as below.

r Set the desired frequency with the channel selec-

tor.

t Operate the connected PC or TNC (TO).

PRESETTING FOR RTTY

•Tone frequency

q Push [SET] for 1 sec. to enter

quick set mode

.

w Push [∫ UP]/[√DN] several times until “TON 2125”

appears, then rotate the channel selector to select
the desired tone frequency.

• Shift frequency

q Push [SET] for 1 sec. to enter

quick set mode

.

w Push [∫ UP]/[√ DN] several times until “SIFT 170”

appears, then rotate the channel selector to select
the desired tone frequency.

• RTTY reverse mode

Received characters are occasionally garbled when
the receive signal is reversed between MARK and
SPACE. This reversal can be caused by incorrect
TNC connections, settings, commands, etc.

To receive a reversed RTTY signal correctly, select
RTTY-R (RTTY reverse) mode.

•Push [MODE] for 1 sec. to select RTTY-R (RTTY re­verse) mode.

ï RTTY (AFSK) operation

q Connect a terminal unit as on p. 25.
w Select SSB (LSB) mode with [MODE].

•Generally, LSB is used on the HF bands.

e Select the desired FSK tone/shift frequencies and

keying polarity the same way as FSK operation.

r Set the desired frequency with the main dial.
t Operate the connected PC or TNC (TO).

space

170

Hz

mark

2125

Hz

RTTY mode
is selected.

RTTY mark frequency
is set to 2125 Hz.
2125, 1615 and 1275
Hz are available.

RTTY shift frequency
is set to 850 Hz.
850, 425, 200 and
170 Hz are available.

ReverseNormal

mark

space

2125

Hz

170

Hz

BFO

BFO

displayed freq.displayed freq.

27

4

OPERATION

■ 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.

q Select the desired channel by pushing

[√ DN]/[UP ∫], rotating the channel selector, or
using the keypad. (p. 13)

w Push [FC] to select channel comment indication, if

desired.

e Push [ENT] for 1 sec. to enter channel comment

programmable mode.

• 1st digit blinks

r Push corresponding keys to enter desired charac-

ters. (see the following chart)

• Push [√ DN]/[UP ∫], or rotate the channel selec­tor to move the cursor to select the next charac­ter, or to change the digit.

t Push [ENT] for 1 sec. to store the channel com-

ment.

ï Corresponding characters

(1), (space), (’),

( ( ), ( ) ), (∗), (+),

(–), (/), (<), (=),

(>), (@)

(4), (G), (H), (I)

(7), (P), (R), (S)

(space w/change digit)

KEY Assignable characters

(2), (A), (B), (C)

(5), (J), (K), (L)

(8), (T), (U), (V)

(0), (Q), (Z)

KEY Assignable characters

(3), (D), (E), (F)

(6), (M), (N), (O)

(9), (W), (X), (Y)

KEY Assignable characters

Push for 1 sec.

Push for 1 sec.

• Channel comment programming example

×4 (I)

×4 (C)

×1 (2)

×4 (O)

×2 (M)
×2 (2 spaces)

Push or rotate channel
selector, then;

5

28

SET MODE

■ 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.

• Quick set mode is selected and one of its items ap­pears.

w Push [UPY] or [Z DN] to select the desired item.
e Rotate the main dial to set the values or conditions

for the selected item.

r Repeat w and e to set other items.
t To exit quick set mode, push [SET] momentarily.

D Initial set mode operation

q Push [PWR] for 1 sec. to turn power OFF.
w While pushing and holding [SET], push [PWR] to

turn power ON.

• Initial set mode is selected and one of its items appears.

e Push [UPY] or [Z DN] to select the desired item.
r Rotate the main dial to set the values or conditions

for the selected item.

t Repeat e and r to set other items.
y To exit initial set mode, push [PWR] for 1 sec. to

turn power OFF.

u Push [PWR] to turn power ON again.

• The conditions selected in initial set mode are now ef­fective.

Item

Value of
Condition

Item

Value of
condition

[DISPLAY EXAMPLE: INITIAL SET MODE]

[DISPLAY EXAMPLE: QUICK SET MODE]

[DIAL]

[√]

[∫]

[SET]

[DIAL]

[PWR]

[√]

[∫]

[SET]

29

5

SET MODE

•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 auto­matically.

•Mic gain

This item adjusts microphone gain from 0 to 99 and H by indication, however, it
can be adjusted continuously.
The default is 50.
Note that while adjusting the mic gain, the ALC meter is displayed automatically.

•VOX gain

This item adjusts the VOX gain for the VOX (voice activated transmit) function.
The default is 50.

•Anti VOX level

This item adjusts the ANTI-VOX gain for the VOX (voice activated transmit).
The default is 50.

•CW pitch

This item adjusts CW pitch. CW pitch is adjustable from 300 Hz to 900 Hz in
10 Hz steps.

The default is 60 (600 Hz).

•VOX delay

This item adjusts VOX (voice activated transmit) delay time. The delay time can
be adjusted from 0 to 2 sec. in 0.1 sec. units.
The default is 10 (1.0 sec).

■ Quick set mode items

•Filter

This item selects filter bandwidth from wide, normal, and narrow.
The default is normal (no indication appears).

•VOX function

This item selects the VOX function from ON and OFF.
The default is of (OFF).

30

5

SET MODE

•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.

•BK-IN delay

This item adjusts break-in delay time for CW semi break-in operation. The delay
time is selectable from 2.0 to 13 (dots).
The default is 7.

•Key speed

This item adjusts the CW key speed. The key speed can be selected from 6 to
60* wpm.
The default is 20 wpm.

*40, 44, 47, 50, 52, 54, 56, 57, 59 cannot be selected.

•Key ratio

This item sets the CW key ratio (or weight). The ratio can be selected from 2.8 to

4.5.
The default is 30 (3.0).

•RTTY shift

This item adjusts RTTY shift. There are 4 selectable values: 170, 200, 425 and

850.
The default is 170 Hz.

•Dimmer

This item selects LCD back light brightness. There are 3 selectable values: Off,
Low and High.
The default is HI (High).

•RTTY mark tone

This item selects RTTY tone. There are 3 selectable values: 1275, 1615 and
2125 Hz.
The default is 2125 Hz.

•Tuning step

This item selects tuning step for the channel selector’s tuning.
The default is 1 k (1 kHz).

■ Quick set mode items— (continued)

31

5

SET MODE

•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).

•Beep level

Adjusts the confirmation beep level from 1 to 99.
The default is 50.

•Side-tone level

Adjusts the CW side-tone level from 1 to 99.
The default is 30.

•Beep

A beep sounds each time a switch is pushed to confirm it. This function can be
turned OFF for silent operation.
The default is on.

■ Initial set mode items

•Meter peak hold

Selects meter peak hold function on or off.
The default is on.

•Scan resume

Selects the scan resume function ON or OFF.
ON: Resumes 10 sec. after stopping on a signal (or 2 sec. after a signal disappears);
OFF: Does not resume after stopping on a signal.
The default is on.

•AM Noise blanker

When this item is set to ON, the noise blanker function is available in AM mode.
This is useful when communicating in AM mode (the noise blanker function should

not be used when listening to regular AM broadcasts as it may degrade the receive audio)

.

The default is on.

•Scan speed

Selects scanning speed from High and Low.
The default is HI (High).

32

5

SET MODE

•Key type

Selects the CW paddle type. Four selections are available.

•n : normal (for electronic keyer use)

• r : reverse (for electronic keyer use)

•oF : Turns OFF the electronic keyer (for straight key use)

•ud : For using the microphone’s [UP]/[DN] keys instead of the paddle.
The default is n (normal).

•Tuner type

Selects the connected antenna tuner type. Four selections are available.

•no : No optional tuner is connected.

•4 :When AH-4 is connected.

•12 :When AT-120 is connected.

•13 :When AT-130 is connected.
The default is no.

•Number of maximum memory channels

Sets number of programmable memory channels from 1 to 99.
The default is 99.

•CI-V baud rate

Sets the data transfer rate. When “Auto” is selected, the baud rate is automati­cally set according to the connected controller or remote controller.
The default is At (Auto).

•CI-V address

To distinguish equipment, each CI-V transceiver has its own Icom standard ad­dress in hexadecimal code. The IC-78’s address is 62.
When 2 or more IC-78s are connected to an optional CT-17 CI-

V LEVEL CON

-

VERTER

, 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. When “on”is selected, changing the frequency, oper­ating mode, etc. on the IC-78 automatically changes those of connected trans­ceivers (or receivers) and vice versa.
The default is on.

•CI-V 731 mode

When connecting the IC-78 to the IC-735 for transceive operation, you must
change the operating frequency data to 4 bytes.

•This item MUST be set to “on” when operating the transceiver with the IC-735.

The default is oF (off).

■ Initial set mode items— (continued)

33

5

SET MODE

•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, FL­53A, FL-257 and none (default). See p. 21 for usable filters for each mode and
see p. 38 for filter installation.

•Expand Filter

When an optional IF filter is installed, this selection expands filter and filter se­lection (W/N) key combination in operating mode independently.
The default is oF (off).

•Filter select (Wide)

When an optional IF filter is installed, you can arrange the wide filter selection.
(p. 22)
This item appears only when the Expand Filter, as above, is turned ON.

■ Initial set mode items— (continued)

•Filter select (Narrow)

When an optional IF filter is installed, you can arrange the narrow filter selection.
(p. 22)
This item appears only when the Expand Filter, as above, is turned ON.

6

EXTRA FEATURES

34

■ 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.

To enter VFO mode, push [FC] for 1 sec.

•VFO indicator appears.

• In the VFO mode, channel comment cannot be indi­cated.

■ VFO operation

D Entering VFO mode

D Tuning

The transceiver has several ways of tuning for tem­poral operation as follows;

• Tuning with the channel selector

By rotating the channel selector, operating fre­quency changes in the desired tuning step, set in
the

quick set mode

. (p. 30)

This is the most convenient way when searching
for signals around the pre-programmed frequency.

• Tuning with the keypad

Enter the frequency as follows.

➥ For duplex operation setting, push [TXF] then set

the transmit frequency, after the receive frequency
is set.

[FC]

•Start

•To set to 25.118 MHz

•To set to 706 KHz (0.706 MHz)

•To set to 5.0000 MHz

Appears only when 1 Hz
tuning step is selected.

Changing digit; according to selected tuning step

•To change 13.1430 MHz to 13.3190 MHz

6

EXTRA FEATURES

35

D Channel programming

The programmed frequencies, both transmit and re­ceive, 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.

•Any channels, even blank channels, can be selected.

•If you want to select the desired channel with keypad,
select the channel before entering VFO mode.

e Tune to the desired receive frequency with the

channel selector, or keypad. (p. 34)

•Selects operating mode and other settings, such as fil­ter selection, RF attenuator, etc., if necessary.

r Push [ENT] for 1 sec. (3 beeps are emitted), to store

the frequency into the selected channel.

•Reprogram the channel comment, if necessary. (p.27)

• Split (duplex) channel programming

q Store receive frequency as instructed above.
w Push [TXF] to indicate the transmit frequency.

•The “TX” indicator blinks.

e Tune to the desired transmit frequency with the

channel selector, or keypad. (p. 34)

r Push [ENT] for 1 sec. (3 beeps are emitted), to store

the transmit frequency into the selected channel.

•The “ ” indicator appears.

D Call channel programming

The programmed frequencies, both transmit and re­ceive, in call channel can also be re-programmed
from the VFO mode.

➥ Select channel 0 (call channel) with the keypad in

the channel mode or [√ DN]/[UP ∫] in the VFO
mode.

•The channel 0 cannot be selected with the channel se­lector

•When the channel 0 is selected with [CALL], the stored
frequencies cannot be re-programmed.

• Pushing [FC] for 1 sec. to enter into VFO mode when

channel 0 is selected in channel mode.

➥ Set receive or both receive and transmit frequen-

cies, operating mode and other settings as above,
then push [ENT] for 1 sec. to store into call chan­nel.

[ENT]

[FC]

[ENT]
[TXF]

36

6

EXTRA FEATURES

■ 2-Tone alarm operation

The 2-tone alarm is used for instant emergency opera­tion. When the 2-tone alarm function is activated, the
call channel (2182 kHz, distress channel, is pre-pro­grammed) is selected automatically, and emits a dis­tress alarm.

D Operation

➥ Push [TONE] to emit a distress alarm signal for a

specified time period from the speaker only.

•“ ” appears.

• Push [TONE] again to cancel the distress alarm signal
emission.

•Push [CALL] to return to previous condition.

➥ Push [TONE] for 1 sec. to transmit a distress alarm

or alarm testing signal for a specified time period.

•“ ” appears with the transmit indicator.

• Push [TONE] again to cancel the distress alarm signal
transmission.

•Push [CALL] to return to previous condition.

[TONE]

D Channel clearing

If un-necessary channels are available, the stored fre­quency can be cleared. The cleared channels are
skipped in the channel mode operation,

q Select desired channel in channel mode. (p. 13)
w Enter VFO mode by pushing [FC] for 1 sec.

•Channel selection with [√ DN]/[UP ∫] is also possible

in the VFO mode.

e Push [0], then [ENT].
r Push [ENT] for 1 sec. (3 beeps are emitted), to clear

the selected channel.

•The “ ” indicator appears.

Note: Blank channels cannot be selected with

[√ DN]/[UP ∫], and channel selector; can only
be selected with the keypad.

Appears when

l

r

.

7

37

INST ALLATION AND CONNECTIONS

■ Opening the transceiver’s case

Follow the case and cover opening procedures shown
here when you want to install an optional unit or adjust
an internal unit, etc.

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 trans-

ceiver and 4 screws from the sides, then lift up the
top cover.

w Remove the 5 screws from the bottom of the trans-

ceiver, then remove the bottom cover.

■ Optional bracket and carrying handle

D Mounting bracket

An optional IC-MB5

MOBILE MOUNTING BRACKET

is
available to install the radio under a table, on a wall,
in a vehicle, etc.

Select an area to mount the transceiver keeping in
mind that the weight of the transceiver is approx.

3.80kg.

D Carrying handle

An optional handle allows you to easily carry and
transport the transceiver.

Attach the MB-23

CARRYING HANDLE

with the supplied

rubber feet as shown.

38

7

INST ALLA TION AND CONNECTIONS

■ 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 in the previous

diagram.

w Disconnect W2 from J4401 (MAIN unit) and W3

from J4201 (MAIN unit).

e Remove 9 screws from the PLL unit, disconnect P4

from J201 (MAIN unit) and P2 from J401 (MAIN
unit), then remove the PLL unit.

r Remove the supplied internal crystal and replace

with the CR-338.

t Return the PLL unit, plugs and flat cables to their

original positions.

y Adjust the reference frequency at C16 using a fre-

quency counter if desired.

• Connect the frequency counter to P 2 (PLL unit).

u Return the bottom cover to its original position.

CR-338

PLL unit

Internal crystal

W 3

W 2

J 4201

J 4401

P 4
J 201

J 401

P 2; Frequency check point
(Connect a frequency counter
and adjust the frequency to

64.00000 MHz with C 16.)

C 16

MAIN unit

PLL unit

■ Optional IF filters

Several IF filters are available for the IC-78. You can
install 1 filter for 455 KHz IF. Choose the appropriate
filter for your operating needs. (pgs, 21, 22)

D Installation

q Remove the bottom cover as shown on the p. 48.
w Remove 7 screws, connection cable p1 from J1, p5

from J701, W4 from J4101 and W5 from J4001 and
2 Tr-clampers as shown in the diagram below.

e Install the de-

sired 455 KHz
filter as shown
in the diagram
at right.

r Mount the filter

with the sup­plied washers
and nuts.

t Solder the 4

leads.

y Return the

MAIN unit and
bottom cover to
their original po­sitions.

After filter installation, specify the installed filter

using

initial set mode

. (p. 33) Otherwise, the in-

stalled filter will not function properly.

J 701

P1

P5

W4

Tr-clamper

Tr-clamper

MAIN unit

J4101

J1

W5

Optional IF filter

Solder 4 leads

Solder the 4 leads

PROBLEM POSSIBLE CAUSE SOLUTION REF.

RECEIVE

POWER

TRANSMIT

DISPLAY

8

39

MAINTENANCE

■ Troubleshooting

The following chart is designed to help you correct
problems which are equipment malfunctions.

If you are not able to locate the cause of a problem or
solve it through the use of this chart, contact your near­est Icom Dealer or Service Center.

Power does not come
on when the [PWR]
switch is pushed.

No sounds comes out
from the speaker.

Sensitivity is too low,
and only strong signals
are audible.

Received audio is un­clear or distorted.

Your signal does not
reach as far away as
usual.

Transmit signal is un­clear or distorted.

The displayed channel
does not change prop­erly.

• Power cable is improperly connected.

• Fuse is blown.

• Volume level is too low.

• The squelch is closed.

• The transceiver is in transmitting condi­tion.

• The antenna is not connected properly.

• Antenna is not properly matched to the
operating frequency.

• Wrong tuner condition is selected in set
mode.

• The attenuator is activated.

• Wrong type of mode (emission) is se­lected.

• Noise blanker is turned ON when receiv­ing a strong signal.

• The [RIT] control is rotated too far clock­wise, or counterclockwise.

• Antenna tuner is improperly matched to
the operating frequency when manual
tuning is selected.

• CW or RTTY mode is selected for voice
transmission.

• Wrong type of mode (emission) is se­lected.

• Microphone is too close to your mouth.

• The dial lock function is activated.

• A quick set mode is selected.

• Re-connect the DC power cable correctly.

• Check for the cause, then replace the fuse
with the spare one.
(Fuses are installed in the DC power cable

and the internal PAunit.)

• Rotate [AF] clockwise to obtain a suitable
listening level.

• Turn [RF/SQL] to the position which opens
the squelch.

• Check the SEND line of an external unit,
if desired.

• Re-connect to the antenna connector.

• Push [TUNE] to tune the connected an­tenna tuner.

• Set the proper condition for the connected
tuner.

• Push [ATT] to turn the attenuator OFF.

• Push [MODE] to select the proper operat­ing mode (emission).

• Push [NB] to turn the noise blanker OFF.

• Adjust the [RIT] control to receive proper
audio output.

• Push [TUNE] to tune the connected an­tenna tuner.

• Push [MODE] to select USB, LSB, or AM
mode.

• Push [MODE] to select the proper operat­ing mode (emission).

• Speak into the microphone naturally and
do not hold the microphone too close to
your mouth.

• Push [LOCK] to turn the lock function
OFF.

• Push [SET] to exit the quick set mode.

p. 10
p. 40

p. 15

p. 15

p. 5

p. 9
p. 18

p. 32

p. 19
p. 15

p. 19

p. 19

p. 18

p. 15

p. 15

p. 15

p. 14

p. 28

40

CIRCUITRY FUSE REPLACEMENT

The 13.8 V DC from the DC power cable is applied to
all units in the IC-78 through the circuitry fuse. This
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.

e Replace the top cover.

■ Fuse replacement

If a fuse blows or the transceiver stops functioning, try
to find the source of the problem, and replace the dam­aged fuse with a new, rated fuse.

CAUTION:DISCONNECT the DC power cable

from the transceiver when changing a fuse.

The IC-78 has 2 types of fuses installed for transceiver
protection.

•DC power cable fuses................................FGB 20 A

•Circuitry fuse ................................................FGB 4 A

DC POWER CABLE FUSE REPLACEMENT

■ Resetting the CPU

Returns programmed values in both

quick

and

ini-

tial set mode

to their defaults.

When first applying power or when the function seems
to be displaying erroneous information, reset the CPU
as follows:

q Make sure transceiver power is OFF.
w While pushing [UP Y] and [Z DN], push [PWR] to

turn power ON.

•The internal CPU is reset.

[PWR]

[√][∫]

8

MAINTENANCE

20 A
fuse

FGB 4 A

PA unit

9

REMOTE JACK INFORMATION

41

•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.

Up to 4 Icom CI-V transceivers or receivers can be
connected to a personal computer equipped with an
RS-232C port. See p. 32 for setting the CI-V condition
using set mode.

•Data format

The CI-V system can be operated using the following
data formats. Data formats differ according to com­mand numbers. Adata area or sub command is added
for some commands.

CONTROLLER TO IC-78

FEFEFE 62 E0 Cn Sc Data area FD

Preamble code (fixed)

Transceiver’s default address

Controller’s default address

Command number

(see table at right)

Sub command number

(see table at right)

BCD code data for frequency or

memory number entry

End of message code (fixed)

OK MESSAGE TO CONTROLLER

FE FE E0 62 FB FD

Preamble code (fixed)

Controller’s default address

Transceiver’s default address

OK code (fixed)

End of message code (fixed)

NG MESSAGE TO CONTROLLER

FE FE E0 62 FA FD

Preamble code (fixed)

Controller’s default address

Transceiver’s default address

NG code (fixed)

End of message code (fixed)

IC-78 TO CONTROLLER

FE E0 62 Cn Sc Data area FD

Preamble code (fixed)

Controller’s default address

Transceiver’s default address

Command number

(see table at right)

Sub command number

(see table at right)

BCD code data for frequency or

memory number entry

End of message code (fixed)

qwert y u

qwert y u

■ CI-V remote control

9–15 V DC

personal
computer

ct- 17

BC-25
(optional)

mini-plug cable

IC-78

9

CONTROL COMMAND

42

•Command table

Command Sub command Description

00 — Send frequency data
01 — Send mode data
02 — Read Upper/Lower frequencies
03 — Read frequencies
04 — Read operating mode
05 — Set operating frequency
06 — Set mode

08

— Set memory
— Set memory channel

0E

00 Scan stop
01 Memory scan start

11 — ATT

01 AF gain

14 02 RF gain

03 Squelch level

15

01 Read squelch Open/Close
02 Read S-meter level
02 PREAMP

16 22 Noise blanker

44 Microphone compressor

19 00 Read ID

■ 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.
w Connects a mini-plug cable between two IC-78’s

(master and sub) [REMOTE] jack.

e While pushing [TXF] and [FC], turn the master IC-

78 power ON.

r While pushing [SET] and [FC], turn the sub IC-78

power ON.

t Push [TONE] of the master IC-78 to start cloning.

• After cloning complete;

y Turn power OFF

[REMOTE] jack

Mini-plug cableto [REMOTE]

to other IC-78’s
[REMOTE]

Master transceiver
indication

Daughter transceiver

indication

Daughter transceiver
indication

Master transceiver
indicates “M”.

43

SPECIFICATIONS

■ GENERAL

•Frequency range :
Rx 0.030000–29.999999 MHz*

1

Tx 1.600000–29.999999 MHz*

2

*1Guaranteed range: 0.5–29.999999 MHz
*

2

Not guaranteed for some frequency bands

• Mode : USB, LSB, CW, RTTY, AM

• No. of memory channels : 99 (Duplex) +1 call

• Frequency stability :
Less than ±200 Hz from 1 min. to 60 min. after
power ON. After that rate of stability less than
±30 Hz/hr. at +25˚C (+77˚F). Temperature fluctua­tions 0˚C to +50˚C (+32˚F to +122˚F) less than
±350 Hz

•

Power supply requirement

(negative ground)

13.8 V DC ±15 %

• Current drain (at 13.8 V DC):
Receive Stand-by 1.3 A

max. audio 2.0 A

Transmit max. power 20.0 A

• Operating temp. range: –10˚C to +60˚C

; +14˚F to +140˚F

• Antenna connector : SO-239 (50 Ω)

• Dimensions : 240(W)×95(H)×239(D) mm

(projections not included)

97⁄16(W)×33⁄4(H)×913⁄32(D) in

• Weight (approx.) : 3.8 kg; 8 lb 6 oz

• ACC connector : 13-pin

■ TRANSMITTER

• Modulation system :
SSB Balanced modulation
AM Low level modulation

• Output power :
SSB, CW, RTTY 2–100 W
AM 2–40 W

• Spurious emissions : Less than –46 dB below peak

output power

• Carrier suppression : More than 40 dB

• Unwanted sideband : More than 50 dB

• Microphone connector: 8-pin connector (600 Ω)

■ RECEIVER

•Receiver system : Double-conversion

superheterodyne

• Sensitivity (10 dB S/N) :
SSB, CW, RTTY

0.16 µV (1.600–29.999999 MHz)

(0.5 µV at 12 dB SINAD)

AM 13 µV (0.5–1.599999 MHz)

2 µV (1.600–29.999999 MHz)

• Selectivity :
SSB, CW, RTTY More than 2.1 kHz/–6 dB

Less than 4.5 kHz/–60 dB

AM More than 6.0 kHz/–6 dB

Less than 20 kHz/–40 dB

• Spurious and image rejection ratio:

(1.600–29.999999 MHz) More than 70 dB

• Audio output power : More than 2.0 W at 10%

(at 13.8 V DC) distortion with an 8 Ω load

•RIT variable range : ±1200 Hz

•PHONES connector : 3-conductor 6.5 (d) mm

(1⁄4″)

•Ext. SP connector : 2-conductor 3.5 (d) mm

(1⁄8″)

/

8 Ω

All stated specifications are typical and subject to
change without notice or obligation.

10

SP-7 EXTERNAL SPEAKER

Compact speaker for base station op­eration. Height can be adjusted for
your convenience.

FL-52A, FL-53A, FL-96, FL-222
and FL-257 455 KHz FILTERS

• FL-52A: 500 Hz/-6dB
(CW/RTTY narrow)

• FL-53A: 250 Hz/-6dB (CW narrow)

• FL-96: 2.8 KHz/-6dB (SSB wide)

• FL-222: 1.8 KHz/-6dB (SSB narrow)

• FL-257: 3.3 KHz/-6dB (SSB wide)

CR-338 HIGH-STABILITY

CRYSTAL UNIT

Contains a temperature-compensat­ing oven heater and crystal unit for
improved frequency stability.

•Frequency stability:±0.5 ppm

AH-710 FOLDED DIPOLE

ANTENNA

Covers from 1.9–30 MHz bands. Has
an SO-239 connector. 30 m (98.4 ft)
coaxial cable with PL-259 connector
is supplied.

11

44

OPTIONS

AH-4 AUTOMA TIC ANTENNA

TUNER

Specially designed to tune a long wire
antenna for portable or mobile HF op­eration. The PTT tuner start function
provides simple operation.

•Input power rating: 120 W

SP-20 EXTERNAL SPEAKER

4 audio filters; headphone jack; can
connect to 2 transceivers.

•Input impedance: 8 Ω

•Max. input power: 5 W

AH-2b ANTENNA ELEMENT

A 2.5 m long an­tenna element for
mobile operation
with the AH-4.

•Frequency
coverage:

3.5–28 MHz
bands with the
AH-4

PS-85 DC POWER SUPPLY

Light weight switching regulator sys­tem power supply.

• Output voltage: 13.8 V DC

• Max. current drain: 20 A

SP-21 EXTERNAL SPEAKER

Designed for base station operation.
Input impedance: 8 Ω
Max. input power: 5 W

AT-130/E AUTOMATIC

ANTENNATUNER

Matches the transceiver to a long wire
antenna with a minimum of insertion
loss.

MN-100 ANTENNA MATCHER

Match the transceiver to a dipole an­tenna. Covers all HF bands from 1.5
to 30 MHz. 8 m×2 antenna wires
comes attached.

MN-100L ANTENNA MATCHER

Match the transceiver to a long wire
antenna. Covers all HF bands from

1.5 to 30 MHz. 15 m×1 antenna wire
comes attached.

approx. 24.5 m; 80.3 ft

11

45

OPTIONS

CT-17 CI-V LEVELCONVERTER

For remote transceiver control using a
personal computer. You can change
frequencies, operating mode, memory
channels, etc.

OPC-420 4-CONDUCTOR SHIELD CABLE

For the connection between transceiver and antenna tuner.
Compatible with the control cable, that is supplied with the
AT-120, AT-130 and AH-4. Cable length: 10 m (32.8 ft)

OPC-599 ADAPTER CABLE

13-pin, ACC connector to 7-pin + 8-pin ACC connector.

MB-23 CARRYING HANDLE

Carrying handle, convenient for
portable operation.

IC-MB5 MOBILE MOUNTING

BRACKET

Transceiver mounting bracket for mo­bile operation.

HM-36 HAND MICROPHONE

Hand microphone equipped with
[UP]/[DOWN] switches.

Same as supplied.

SM-8 DESKTOP MICROPHONE

Including 2 connection cables for si­multaneous connection of 2 trans­ceivers. Has [UP]/[DOWN] switches.

SM-20 DESKTOPMICROPHONE

Unidirectional, electret microphone for
base station operation. Includes
[UP]/[DOWN] switches and a low cut
function.

SM-6 DESKTOP MICROPHONE

Electret condenser-type desktop mi­crophone.

1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003 Japan

A-5658H-1EX-w
Printed in Japan
© 2000 Icom Inc.