Northern Airborne Technology 802 - Manual (Page 23)

802-009 Switch Panel
SM802 Installation and Operation Manual
Section 3 Rev: 1.00 Issue 4 Page 3-3
3.3.2 MIC SELECT Switch
The MIC SELECT switch is a 5-position rotary control (VHF1, VHF2, HF1, HF2, and
PASS) used to select the transceiver for transmission.
During PTT key, it connects the mic input to the selected transmitter or PA mic
output. In transmitter positions, it turns on the PTT Mute function of the Model 700,
and in the PASS position, it turns on the PA Key (sidetone) function of Model 700
and enables PASS volume control to the PA amplifier. In the HF1 and HF2 positions
it allows for antenna switching unit control.
3.3.3 BOTH/VOICE/IDENT Switch
The BOTH/VOICE/IDENT switch is a three-position switch used for selecting the
navigation filter modes.
BOTH position:
No filtering, both identifier and voice filtering functions are
switched off.
VOICE position: Voice filtering is switched on.
IDENT position: Identifier filtering is switched on.
3.3.4 NORM MIC/OXY MIC Switch
The NORM MIC/OXY MIC switch is a two-position rotary control used to select
the mic for transmission/PA use. During PTT, the selected Mic is connected to
the HOT MIC output and to the selected transmitter mic output.
NORM MIC: Connects the normal mic input to the HOT MIC output.
OXY MIC: Connects the Oxygen mic input to HOT MIC output. Also turns
ON the following Model 700 functions: INPH Hot switch, INPH to
SPKR switch and Speaker switch.
3.3.5 HI/LO MKR Sensitivity Switch
The HI/LO MKR Sensitivity switch is a two-position switch used to select the Marker
receiver sensitivity.
3.3.6 Transmission Functions
3.3.6.1 Keyed Transmission
To key a selected transmitter, the pilot may either use the yoke mounted Push-To-Talk (PTT) key switch
with the NORM or OXY microphones or the PTT key switch on a hand-held microphone. The MIC
SELECT rotary switch on the 802-009 Switch Panel determines which transmitter is to be keyed and
ENG-FORM: 806-0112.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.