PS Engineering PMA9000EX Pilot’s Guide - Manual (Page 5)

202-920-0100 Page 5 OCT. 2010
1.2 COM Audio Receive Selector (3)
Communication audio from the other radio, not selected for transmit,
can be heard by pressing the associated
RCV button. You will always hear the
audio from the selected transceiver.
1.3 NAV Audio selection (4)
VHF Navigation receiver audio is selected
through two momentary, push-button,
backlit switches. VHF Navigation aid au-
dio push buttons are labeled N1, N2.
The users can identify which receivers are
selected by noting which green LEDs are lit above the button.
2.0 Marker Beacon Receiver (5)
2.1 Marker Beacon Operation (5)
The Marker Beacon Receiver uses visual and audio indicators to alert
you when the aircraft passes over a 75 MHz transmitter.
The Blue lamp, labeled “O”, is the Outer Marker lamp and has an
associated 400-Hertz 'dash'
tone. The lamp and tone will
be keyed at a rate of two
tones/flashes per second
when the aircraft is in the
range of the Outer Marker
Beacon.
The Amber lamp, labeled
“M”, is the Middle Marker lamp and is coupled with a 1300 Hertz
tone. It is keyed alternately with short 'dot' and long 'dash' bursts at 95
combinations per minute.
The White lamp, labeled “I”, is the Inner marker and has a 3000 Hertz
'dot' tone. The lamp and tone will be keyed at a rate of six times per
second.
The MKR button controls audio selection, marker sensitivity, and
audio muting, and lamp test.
• MKR button press of < 1 second: toggles between high
and low receiver sense