Navigation (Nav) Receiver; Transponder - Cirrus DESIGN SR20 Information Manual

Section 7 Cirrus Design
Airplane Description SR20

Navigation (Nav) Receiver

The Garmin GNS 430 provides an integrated Navigation (NAV)
receiver with VHF Omnirange/Localizer (VOR/LOC) and Glideslope
(G/S) capability. The VOR/LOC receiver receives VOR/LOC on a
frequency range from 108.000 Mhz to 117.950 Mhz with 50 kHz
spacing. Glideslope is received from 329.150 to 335.000 in 150 kHz
steps. The Nav receiver controls are integrated into the Garmin GPS
430 control mounted in the center console. The receiver control
provides active and standby frequency indication, frequency memory
storage, and knob-operated frequency selection. IDENT audio output
for VOR and LOC is provided to the audio system. The Nav antenna is
mounted on top of the vertical tail. 28 VDC for navigation receiver
operation is controlled through the Avionics Master Switch on the
bolster switch panel and supplied through the 5-amp GPS1 circuit
breaker on the Avionics Non-Essential Bus.

Transponder

The airplane is equipped with a single Garmin GTX 320 or GTX 327
ATC Mode C (identification and altitude) transponder with squawk
capability. The transponder system consists of the integrated receiver/
transmitter control unit, an antenna, and an altitude digitizer. The
receiver/transmitter receives interrogations from a ground-based
secondary radar transmitter and then transmits to the interrogating Air
Traffic Control Center. Digitized altitude information is provided by a
altitude digitizer (encoder) plumbed into the airplane static system.
The transponder and integrated controls are mounted in the center
console. The transponder control provides active code display, code
selection, IDENT button, and test functions. The display is daylight
readable and dimming is operator controlled through the INST lights
control on the instrument panel bolster. The transponder antenna is
mounted on the underside of the fuselage just aft of the firewall. 28
VDC for transponder operation is controlled through the Avionics
Master Switch on the bolster switch panel. 28 VDC for receiver,
transmitter, and altitude encoder operation is supplied through the 2-
amp ENCODER/TRANSPONDER circuit breaker on the Avionics
Essential Bus.
7-74 P/N 13999-002 Info Manual
September 2011