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 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).
nQuick set mode items
¥ Filter
This item selects Þlter 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
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 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 selectorÕs tuning.
The default is 1 k (1 kHz).
nQuick set mode itemsÑ (continued) 
						

							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 on.
nInitial 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
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 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 ÒAutoÓ is selected, the baud rate is automati-
cally 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 ad-
dress in hexadecimal code. The IC-78Õs 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 ÒonÓis selected, changing the frequency, oper-
ating mode, etc. on the IC-78 automatically changes those of connected trans-
ceivers (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 ÒonÓ when operating the transceiver with the IC-735.
The default is oF (off).
nInitial set mode itemsÑ (continued) 
						

							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 (Wide)
When an optional IF Þlter is installed, you can arrange the wide Þlter selection.
(p. 22)
This item appears only when the Expand Filter, as above, is turned ON.
nInitial set mode itemsÑ (continued)
¥ Filter select (Narrow)
When an optional IF Þlter is installed, you can arrange the narrow Þlter selection.
(p. 22)
This item appears only when the Expand Filter, as above, is turned ON. 
						

							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 the channel selector, operating fre-
quency 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.
åFor duplex operation setting, push [TXF] then set
the transmit frequency, after the receive frequency
is set. Appears only when 1 Hz 
tuning step is selected.
Changing digit; according to selected tuning step
¥To set to 25.118 MHz
¥To set to 706 KHz (0.706 MHz)
¥To set to 5.0000 MHz 
¥To change 13.1430 MHz to 13.3190 MHz
¥Start 
						

							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 keypad. (p. 34)
¥ Selects operating mode and other settings, such as Þl-
ter selection, RF attenuator, etc., if necessary.
rPush [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
qStore receive frequency as instructed above.
wPush [TXF] to indicate the transmit frequency.
¥ The ÒTXÓ indicator blinks.
eTune to the desired transmit frequency with the
channel selector, or keypad. (p. 34)
rPush [ENT] for 1 sec. 
(3 beeps are emitted), to store
the transmit frequency into the selected channel.
¥ The Ò Ó indicator appears.
[FC] 
[ENT] 
DCall channel programming
The programmed frequencies, both transmit and re-
ceive, in call channel can also be re-programmed
from the VFO mode.
åSelect channel 0 (call channel) with the keypad in
the channel mode or [ÃDN]/[UPº] in the VFO
mode.
¥ The channel 0 cannot be selected with the channel se-
lector 
¥ 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.
åSet 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 chan-
nel.
[TXF] 
[ENT]  
						

							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.
åPush [TONE] for 1 sec. to transmit a distress alarm
or alarm testing signal for a speciÞed time period.
¥ Ò Ó appears with the transmit indicator.
¥ Push [TONE] again to cancel the distress alarm signal
transmission.
¥ Push [CALL] to return to previous condition.
[TONE] 
DChannel clearing
If un-necessary channels are available, the stored fre-
quency can be cleared. The cleared channels are
skipped in the channel mode operation, 
qSelect desired channel in channel mode. (p. 13)
wEnter VFO mode by pushing [FC] for 1 sec.
¥ Channel selection with [ÃDN]/[UPº] is also possible
in the VFO mode.
ePush [0], then [ENT].
rPush [ENT] for 1 sec. 
(3 beeps are emitted), to clear
the selected channel.
¥ The Ò Ó indicator appears.
Note:Blank channels cannot be selected with
[ÃDN]/[UPº], and channel selector; can only
be selected with the keypad.
Appears when cleared. 
						

							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 bottom of the trans-
ceiver, then remove the bottom cover.
nOptional bracket and carrying handle
DMounting bracket
An optional IC-MB5 MOBILE MOUNTING BRACKETis
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.
DCarrying handle
An optional handle allows you to easily carry and
transport the transceiver.
Attach the MB-23 
CARRYING HANDLEwith the supplied
rubber feet as shown. 
						

							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, plugs and flat cables to their
original positions.
yAdjust the reference frequency at C16 using a fre-
quency counter if desired.
¥ Connect the frequency counter to P 2 (PLL unit).
uReturn 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 16MAIN unit
PLL  unit
nOptional IF Þlters
Several IF Þlters are available for the IC-78. You can
install 1 Þlter for 455 KHz IF. Choose the appropriate
Þlter for your operating needs. (pgs, 21, 22)
DInstallation
qRemove the bottom cover as shown on the p. 48.
wRemove 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.eInstall the de-
sired 455 KHz
filter as shown
in the diagram
at right.
rMount the filter
with the sup-
plied washers
and nuts.
tSolder the 4
leads.
yReturn the
MAIN unit and
bottom cover to
their original po-
sitions.
After filter installation, specify the installed filter
using 
initial set mode. (p. 33) Otherwise, the in-
stalled Þlter will not function properly.
J 701
P1P5
W4
Tr-clamper 
Tr-clamper MAIN unitJ4101
J1
W5
Optional IF filter 
Solder 4 leads
Solder the 4 leads