Cessna 1980 172RG Cutlass Pilot Operating Handbook page 122

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HF
SSB TRANSCEIVER
(TYPE ASB-125)
1. CHANNEL WINDOW - Displays selected channel.
2. RELATIVE POWER METER - Indicates relative radiated power of the power
amplifier/antenna system.
3. MODE SELECTOR CONTROL - Selects one of the desired operating modes:
USB - Selects upper sideband operation for long range voice communica-
tions.
AM - Selects compatible AM operation and full AM reception.
TEL - Selects upper sideband with reduced carrier, used for public corres-
pondence telephone and ship-to-shore.
LSB - (Optional) Selects lower sideband operation (not legal in U.S.,
Canada and most other countries).
4. SQUELCH CONTROL - Used to adjust signal threshold necessary to activate
receiver audio. Clockwise rotation increases background noise (decreases
squelch action); counterclockwise rotation decreases background noise.
5. CLARIFIER CONTROL - Used to "clarify" single sideband speech during
receive while in USB mode only.
CHANNEL SELECTOR CONTROL - Selects desired channel. Also selects AM
6.
mode if channel frequency is 2003 kHz, 2182 kHz or 2638 kHz.
7. ON - AUDIO CONTROL - Turns set ON and controls receiver audio gain.
HF
Figure 1. SSB
Transceiver Operating Controls
2
PILOT'S OPERATING HANDBOOK
SUPPLEMENT
1 July 1979
'
S OPERATING HANDBOOK
PILOT
SUPPLEMENT
SECTION 2
LIMITATIONS
There is no change to the airplane limitations when this avionic
equipment is installed.
SECTION 3
EMERGENCY PROCEDURES
There is no change to the airplane emergency procedures when this
avionic equipment is installed.
SECTION 4
NORMAL PROCEDURES
COMMUNICATIONS TRANSCEIVER OPERATION:
The pilot should be aware of the two following radio
operational restrictions:
a. For sideband operation in the United States, Canada
and various other countries, only the upper sideband
may be used. Use of lower sideband is prohibited.
b. Only AM transmissions are permitted on frequen-
cies 2003 kHz, 2182 kHz and 2638 kHz. The selection
of these channels will automatically select the AM
mode of transmission.
SEL
Switch (on audio control panel) -- SELECT transceiv-
1. XMTR
er.
SPEAKER/PHONE Selector Switches (on audio control panel) --
2.
SELECT desired mode.
3. ON-AUDIO Control -- ON (allow equipment to warm up for 5
minutes for sideband or one minute for AM operation and adjust
audio to comfortable listening level).
4. Channel Selector Control -- SELECT desired frequency.
5. Mode Selector Control -- SELECT operating mode.
6. SQUELCH Control -- ADJUST clockwise for normal background
noise output, then slowly adjust counterclockwise until the
receiver is silent.
1 July 1979
HF
SSB TRANSCEIVER
(TYPE ASB-125)
NOTE
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3