Icom IC-25A Instruction Manual page 20

from the speaker stops and set it just below this threshold. (When adjusting the Squelch
control setting, if some communication signals can be heard, turn the tuning control either
direction and set it where only noise can be heard.) The transceiver will now remain silent
until an incoming signal is received which opens the squelch and lights the RECEIVE in-
dicator. If the squelch is unstable due to the reception of weak signals or mobile stations,
adjust the squelch control further until the proper threshold is obtained.
· For tuning, Memory Channel operation and Scanning operation refer to "HOW ТО TUNE"
on page 10, "Memory CHANNEL OPERATION" on page 13, and "SCANNING OPERA-
TION" on page 13,
TRANSMITTING
For simplex operation, set the SIMPLEX/DUPLEX Switch in the "SIMP" position.
For duplex operation, set the SIMPLEX/DUPLEX Switch in the "DUP" position and the
DUPLEX MODE Switch іп the "NOR" or "REV" position according to repeater's input
frequency.
When the IC-25A/E is first turned ON, the OFFSET frequency will be preset 600KHz. This
OFFSET frequency is normal repeater input/output frequency separation.
If you desire to operate repeaters that have a frequency difference other than +600KHz, reset
the OFFSET frequency to desired frequency. Refer to "RESETTING THE OFFSET FRE-
QUENCY" on раде 12. |
If the lower output power (1 watt) is sufficient, set the Squelch Control and RF Power Switch
to the LOW (out) position.
Depress the PTT (push-to-talk) Switch on the microphone and the transceiver will transmit.
At the same time the TRANSMIT indicator will illuminate red and the S/RF indicator will
provide an indication of relative power output of the transmitter.
If you need a tone-burst for initial access of the repeater, depress the Tone Call Switch for the
required period. (Tone-burst periods vary individually from 100 milliseconds to 2 seconds.)
(IC-25A : The Tone Call circuit is not installed.)
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