Icom Ic-78 Hf Tranciever Instruction Manual

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. 

IMPORTANT
READ THIS INSTRUCTION MANUAL
CAREFULLY
before attempting to operate the
transceiver.
SAVE THIS INSTRUCTION MANUAL.This
manual contains important safety and operating in-
structions for the IC-78.
EXPLICIT DEFINITIONS
i
PRECAUTIONS
RWARNING HIGH VOLTAGE! NEVERat-
tach an antenna or internal antenna connector during
transmission. This may result in an electric shock or
burn.
RNEVERapply AC to the [DC13.8V] jack on the
transceiver rear panel. This could cause a Þre or ruin
the transceiver....

1
1
TABLE OF CONTENTS
q
w
er
IMPORTANT .............................................................. i
EXPLICIT DEFINITIONS ........................................... i
PRECAUTIONS ........................................................ i
1 TABLE OF CONTENTS  ....................................... 1
SUPPLIED ACCESSORIES  ..................................... 1
2 PANEL DESCRIPTION ................................... 2 Ð 7
nFront panel  ....................................................... 2...

nFront panel 
qPOWER SWITCH [PWR]
å
Push momentarily to turn power ON.
¥ Turn the optional DC power supply ON in advance.
åPush for 1 sec. to turn power OFF.
åWhile pushing and holding [SET], push [PWR] to
enter the 
initial set mode. (p. 28)
wMICROPHONE CONNECTOR [MIC]
Accepts supplied or optional microphone.
¥ See p. 45 for appropriate microphones.
¥ See p. 7 for microphone connector information.
eHEADPHONE JACK [PHONES](p. 11)
Accepts headphones.
¥ When headphones are connected, the internal
speaker...

3
2PANEL DESCRIPTION
!3ATTENUATOR SWITCH [ATT](p. 19)
Push to turn the 20 dB attenuator function ON and
OFF.
!4TUNER SWITCH [TUNER] (p. 18)
åPush to turn the antenna tuner function ON and
OFF.
åPush for 1 sec. to manually tune the tuner.
¥ An optional antenna tuner must be connected.
¥ When the tuner cannot tune the antenna, the tun-
ing circuit is bypassed automatically after 20 sec.
!5SET SWITCH [SET]
åPush for 1 sec. to enter the 
quick set mode.
(p. 28)
åPush and hold [SET], then push [PWR] to enter...

4
2PANEL DESCRIPTION
nFunction display
qLOCK INDICATOR(p. 14)
Appears when the dial lock function is in use.
wRECEIVE INDICATOR
Appears while receiving a signal or when the
squelch is open.
eTUNE INDICATOR
åAppears or disappears when the connected au-
tomatic tuner is tuned completely, depending on
connected antenna tuner type.
åFlashes while tuning.
rTRANSMIT INDICATOR
åAppears while transmitting.
åFlashes while transmit frequency is indicated.
tALARM INDICATOR
*This indicator appears only some...

5
2PANEL DESCRIPTION
nRear panel
qANTENNA TERMINAL [ANT](p. 9)
Connects a 50 ½antenna with a PL-259 connector
and a 50 ½coaxial cable.
wDC POWER SOCKET [DC 13.8V](p. 10)
Accepts 13.8 V DC through the supplied DC power
cable.
eTUNER CONTROL SOCKET [TUNER](p. 11)
Accepts the control cable from an optional antenna
tuner.
rREMOTE JACK [REMOTE](p. 11)
For use with a personal computer for remote opera-
tion of transceiver functions, and data cloning be-
tween transceivers.
tEXTERNAL SPEAKER JACK [EXT SP]...

6
2PANEL DESCRIPTION
D D
ACC SOCKET INFORMATION
¥ ACC socket
¥ When connecting the ACC conversion cable (OPC-599)
ACC PIN # NAME DESCRIPTION SPECIFICATIONS
ACC 1
ACC 2
À FSKKÄ AF
Á GNDÅ SQLSÂ SENDÆ 13.8 V
à MODÇ ALC
À 8 VÄ ALC
Á GNDÅ NCÂ SENDÆ 13.8 V
à BAND
11
22
33
44
88
77
66
55
9
10 11 1213
12
3 4
7 65
Rear panel
view
12348 7 6 5 9
10 11 1213
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. Ñ
Input/output pin.
Ground level : Ð0.5 V to...

7
2PANEL DESCRIPTION
nMicrophone (HM-36)
¥ DESCRIPTION
qUP/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 PADDL in initial set mode. (p. 32)
wPTT 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...

3
8
INSTALLATION AND CONNECTIONS
nAntenna connection
For radio communications, the antenna is of critical impor-
tance, along with output power and sensitivity. Select an-
tenna(s), such as a well-matched 50 ½antenna, and feed
line. 1.5:1 or better of Voltage Standing Wave Ratio (VSWR)
is recommended for your desired band. Of course, the trans-
mission line should be a coaxial cable.
CAUTION: Protect your transceiver from lightning
by using a lightning arrestor.
nUnpacking
After unpacking, immediately...