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PMA7000M Pilot Guide
202-780-0604
Cellular telephone sidetone
As shipped from PS Engineering, the PMA7000M provides cellular tele-
phone sidetone (the user’s voice fed back to the headset). Some cell phones
provide sidetone. In PMA7000M Telephone sidetone can be enabled/
disabled by a internal modification. Con-
tact PS Engineering for information.
Marker Beacon
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 associ-
ated 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 audio from the Marker Beacon Receiver can be heard by selecting the
"MKR" push-button switch. To adjust the volume level, there is a service
adjustment located on the top of the unit.
A three-position switch is used to set the receiver sensitivity and to test the
indicator lamps. Use "
HI
" sensitivity initially. This allows you to hear the
outer marker beacon about a mile out. Then select the “
LO
” sensitivity to
give you a more accurate location of the Outer Marker. The momentary
down switch position is marker test, labeled "
T/M
" and illuminates all
three lamps simultaneously to assure the lamps (internal and external) are
in working order. TST does not activate MM sense output.
Pressing the marker mode select down (to “
T/M
”) will cause the marker
Warning:
United States FCC Regulations contained in 47 CFR § 22.925 contain prohi-
bition on airborne operation of cellular telephones. “Cellular telephones in-
stalled in or carried aboard airplanes, balloons or any other type of aircraft
must not be operated while such aircraft are airborne (not touching the
ground). When any aircraft leaves the ground, all cellular telephones on board
that aircraft must be turned off.”