PS Engineering PMA6000M-C Pilot’s Guide - Manual (Page 9)

202-066-0002 9 PMA6000 –Mono Pilot Guide
Internal Recorder System (Option 1, only)
The recorder function is automatic. Pressing the momentary
switch will cause the last message to play (incoming radio and
transmit sidetone). This will be heard in the pilot headset only.
To hear older messages, push the playback button repeatedly
to “back up” the recorder, until the desired message is heard.
The recorder is a continuous loop, and newest ones will over-
write the oldest messages. The IRS has an internal squelch
that prevents storing ‘dead’ air. A radio signal of more than 1
VRMS is needed to trigger the IRS. Therefore, if the IRS does
not seem to be recording, increase the aircraft radio volume
slightly. Holding the button for more than two seconds stops
playback. The next button push will acess the prior message.
Marker Beacon (PMA6000M-C)
The Marker Beacon Receiver included in the PMA6000M-C
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 air-
craft 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 min-
ute.
The White lamp, labeled "I” is the Air-
way/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 audio from the Marker Beacon Re-
ceiver can be heard by selecting the "M"
push-button switch.
A 3-position switch is used to set the re-
ceiver sensitivity and to test the indicator
lamps. Use "H IGH " sensitivity initially.
Figure 5 Marker Bea-
con