Antennas; Microphone And Headset Installations - Cessna 172S NAV III Pilot Operating Handbook

CESSNA
MODEL 172S NAV III
SECTION 7
AIRPLANE AND SYSTEMS DESCRIPTION
AVIONICS SUPPORT EQUIPMENT
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ANTENNAS
Two combination VHF COM/GPS antennas are mounted on the top
of the cabin. COM 1/GPS 1 antenna is mounted on the RH side.
COM 21GPS 21GDL 69A antenna is mounted on the LH side. They
are connected to the two VHF communication transceivers and the
two GPS receivers in the GIA 63 Integrated Avionics Units, and the
GDL 69A.
A dipole navigation antenna element is mounted on either side of
the vertical stabilizer. This antenna provides VOR and glideslope
signals to the VHF navigation receivers contained in the G lA 63
Integrated Avionics Units.
The marker beacon antenna is mounted on the bottom of the
tailcone. It provides the signal to the marker beacon receiver located
in of the GMA 1347 audio panel.
The transponder antenna is mounted on the bottom of the cabin is
connected to the GTX 33 Mode S transponder by a coaxial
transmission cable.
The DME (if installed) antenna is mounted on the bottom of the
tailcone and is connected to the Honeywell KN 63 DME by a coaxial
cable.
MICROPHONE AND HEADSET INSTALLATIONS
Standard equipment for the airplane includes a hand-held
microphone, an overhead speaker, two remote-keyed microphone
switches on the control wheels, and provisions for communications
headsets at each pilot and passenger station.
The hand-held microphone includes an integral push-to-talk switch.
This microphone is plugged in at the center pedestal and is
accessible to both the pilot and front passenger. Pressing the push-
to-talk switch allows voice transmission on the COM radios.
The overhead speaker is located in the center overhead console.
Volume and output for this speaker is controlled through the audio
panel.
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