Cessna TURBO CENTURION T210M 1978 Pilot Operating Handbook page 251

PILOT'S OPERATING HANDBOOK
SUPPLEMENT
SSB HF TRANSCEIVER
(TYPE ASB-125)
SUPPLEMENT
SSB HF TRANSCEIVER
(TYPE AS B-1 25)
SECTION 1
GENERAL
The ASB-125 HF transceiver is an airborne, 10-channel, single side-
band (SSB) radio with a compatible amplitude modulated (AM)
transmitting-receiving system for long range voice communications in
the 2 to 18 MHz frequency range. The system consists of a panel mounted
receiver/exciter, a remote mounted power amplifier/power supply, an
antenna coupler and an externally mounted, fixed wire, medium/high
frequency antenna.
A channel selector knob determines the operating frequency of the
transceiver which has predetermined crystals installed to provide the
desired operating frequencies. A mode selector control is provided to
supply the type of emission required for the channel, either sideband, AM
or telephone for public correspondence. An audio knob, clarifier knob and
squelch knob are provided to assist in audio operation during receive. In
addition to the aforementioned controls, which are all located on the
receiver/ exciter, a meter is incorporated to provide antenna loading
r eadouts.
The system utilizes the airplane microphone, headphone and speaker.
When two or more radios are installed, a transmitter selector switch and a
speaker-phone switch are provided.
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