Icom Ic-78 Hf Tranciever Instruction Manual

29
5SET 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 auto-
matically.
¥ 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...

30
5SET 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...

31
5SET 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 conÞrmation 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 conÞrm it. This function can be
turned OFF for silent operation.
The default is...

32
5SET 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 microphoneÕs [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...

33
5SET MODE
¥ OPTION Filter
When an optional IF Þler is installed, this selection is necessary, otherwise the
Þlters cannot be selected. Selections available are FL-96, FL-222, FL-52A, FL-
53A, FL-257 and none (default). See p. 21 for usable Þlters for each mode and
see p. 38 for Þlter installation.
¥ Expand Filter
When an optional IF Þlter is installed, this selection expands Þlter and Þlter se-
lection (W/N) key combination in operating mode independently.
The default is oF (off).
¥ Filter select...

6EXTRA FEATURES
34
nINTRODUCTION
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 indi-
cated.
[FC] 
nVFO operation
DEntering VFO mode 
DTuning
The transceiver has several ways of tuning for tem-
poral operation as follows;
¥ Tuning with the channel selector
By rotating...

6EXTRA FEATURES
35
DChannel programming
The programmed frequencies, both transmit and re-
ceive, in operating channel can be re-programmed
from the VFO mode.
¥ Simplex channel programming
qPush [FC] for 1 sec. to enter VFO mode.
wPush [ÃDN]/[UPº] 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.
eTune to the desired receive frequency with the
channel selector, or...

36
6EXTRA FEATURES
n2-Tone alarm operation
The 2-tone alarm is used for instant emergency opera-
tion. When the 2-tone alarm function is activated, the
call channel (2182 kHz, distress channel, is pre-pro-
grammed) is selected automatically, and emits a dis-
tress alarm.
DOperation
åPush [TONE] to emit a distress alarm signal for a
speciÞed time period from the speaker only.
¥ Ò Ó appears.
¥ Push [TONE] again to cancel the distress alarm signal
emission.
¥ Push [CALL] to return to previous condition....

7
37
INSTALLATION AND CONNECTIONS
nOpening the transceiverÕs 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.
qRemove the 5 screws from the top of the trans-
ceiver and 4 screws from the sides, then lift up the
top cover.
wRemove the 5 screws from the...

38
7INSTALLATION AND  CONNECTIONS
nCR-338 HIGH STABILITY CRYSTAL UNIT
By installing the CR-338, the total frequency stability
of the transceiver will be improved.
qRemove the bottom cover as shown in the previous
diagram.
wDisconnect W2 from J4401 (MAIN unit) and W3
from J4201 (MAIN unit).
eRemove 9 screws from the PLL unit, disconnect P4
from J201 (MAIN unit) and P2 from J401 (MAIN
unit), then remove the PLL unit. rRemove the supplied internal crystal and replace
with the CR-338.
tReturn the PLL unit,...