Basic Voice Receive And Transmit; Mode Selection; Rf Gain And Squelch - Icom IC-78 Instruction Manual

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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.
Microphone
connector
w Selects the desired channel to be received with the
Channel Selector, [UP p] or [q DN], or 10-key pad.
• The S-meter shows signal strength when signal is received.
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Mode selection

The following modes are available in the IC-78:
SSB (LSB/USB), CW, CW REV (CW reverse), RTTY,
RTTY REV (RTTY reverse) and AM.
➥ Push [MODE] to select desired operation mode.
➥ Hold down [MODE] for 1 second to change be-
tween 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.
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RF gain and Squelch

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 the Ini-
tial Set mode (p. 30).
• [RF/SQL] control priority
Set mode setting SSB, CW, RTTY
rS (RF/SQL) RF/SQL
At (Auto) RF gain
Sq (SQL)
SQL*
(default)
* 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)
The squelch is available for the other modes.
• A segment is displayed in the S-meter to indicate the
S-meter squelch level.
[RIT]
[AF]
[RF/SQL]
AM
RF/SQL
SQL*
SQL*
when no 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. 18)
y Push [TUNER] to tune the antenna tuner, if connected.
• The "TUNE" icon blinks for 1 to 2 seconds for the first
tuning on a channel.
u Hold down [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.
OPERATING MODE SELECTION
USB LSB
CW CW
RTTY RTTY
AM
• When set as the [RF/SQL] control
Maximum RF gain
Squelch is open.
RF gain adjustable
range
• When set as the [SQL] control
Squelch is open.
Shallow
• When set as the [RF] control
Maximum RF gain
Adjustable range
Minimum RF gain
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OPERATION
MODE
Push
Hold down
MODE
for 1 sec.
S-meter squelch
threshold
S-meter squelch
S-meter squelch
threshold
S-meter squelch
Deep
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