Cessna Hawk XP R172K Pilot Operating Handbook page 118

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1. CHANNELWINDOW - 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 side band operation for long range
voice communications.
AM - Selects compatible AM operation and full AM reception.
TEL - Selects upper sideband with reduced carrier, used for
public correspondence 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 back-
ground noise (decreases squelch action); counterclockwise ro-
tation decreases background noise.
5. CLARIFIER CONTROL - Used to "clarify" single sideband
speech during receive while in USB mode only.
6. CHANNELSELECTOR CONTROL - Selects desired channel.
Also selects AM mode if channel frequency is 2003 kHz, 2182 kHz
or 2638 kHz.
7. ON - AUDIO CONTROL - Turns set ON and controls receiver
audio gain.
Figure 1. SSB HF Transceiver Operating Controls
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other countries, only the upper sideband may be used. Use of lower side
band is prohibited.
(2) Only AM transmissions are permitted on frequencies 2~03 kHz,
2182 kHz, and 2638 kHz. The selection of these channels WIll auto-
matically select the AM mode of transmission.
SECTION 3
EMERGENCY PROCEDURES
There is no change to the airplane emergency procedures when this
avionic equipment is installed.
SECTION 4
NORMAL PROCEDURES
COMMUNICATIONSTRANSCEIVER OPERATION:
(1) XMTR SEL Switch -- SELECT transceiver. .
(2) SPEAKER/PHONE (or AUTO) Switch -- SELECT deair ed mode.
(3) ON-AUDIO Control -- ON (allow equipment to.warm up ~or 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 the audio gain .counte~clockwise. for
normal noise output, then slowly adjust clockwi se untrl the receiver
is silent.
(7) Clarifier Control -- ADJUST when upper Single sideband RF
Signal is being received for maximum clarity.
(8) Mike Button:
a. To Transmit -- DEPRESS and SPEAK into microphone.
b. To Receive -- RELEASE.
NOTE
Voice communications are not available in the LSB mode.
NOTE
Lower sideband (LSB) mode is not legal in the U. S.,
Canada, and most other countries.
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