Marker beacon operation (10) – PS Engineering PMA8000B X User Manual
Page 8
Page 8
202-890-0202
PMA8000B Pilot Guide Rev. 6
This button cycles through the intercom modes, from top to bottom
and then back up, ISO, ALL, Crew, ALL, and ISO. An LED shows
the active mode .
I
SO
: The pilot is isolated from the intercom and is connected only to
the aircraft radio system. He will hear the aircraft radio reception (and
sidetone during radio transmissions). The copilot and passengers will
hear the music sources as configured by the audio panel configuration
Function keys. See page 11—Smart Function Keys for more details.
A
LL
: All parties will hear the aircraft radio and intercom. Crew will
hear Entertainment 1, passengers can hear Entertainment 1 or 2. Dur-
ing any radio or intercom communications, the music volume auto-
matically decreases. The music volume increases gradually back to
the original level after communications have been completed.
C
REW
: Pilot and copilot are connected on one intercom channel and
have exclusive access to the aircraft radios. Again, the music that the
crew and passengers will hear is determined by the Smart Function
Keys.
Marker Beacon Operation (10)
The Marker Beacon
Receiver uses visual
and audio indicators
to alert you when the
aircraft passes over a
75 MHz transmitter.
The Blue lamp, la-
beled “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 cou-
pled 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 audio from the Marker Beacon Receiver can be heard by select-
ing the "MKR" push-button switch. To adjust the volume level, there
is a service adjustment located on the top of the unit.