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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-55-00-006
General
The DME interrogator tunes to 252 channels and calculates
distance information for all the channels in the DME range.
There are 200 DME channels for the VHF NAV frequencies. The
other 52 channels are for military TACAN functions. The DME
receive frequency is 63 MHz above or below the transmit
frequency.
Purpose
These are the purposes of the DME interrogator:
* Interrogate DME stations
* Receive the station replies
* Receive audio identifiers
* Calculate slant range distances.
Frequencies
These DME tuning frequencies are in the VHF band:
* 108.00 to 117.95 MHz for DME stations with VOR or ILS
* 133.30 to 135.95 MHz for DME only stations.
Front Panel
The front panel of the DME interrogator has these features:
* LED status indicators
* A self test switch.
DME SYSTEM - INTERROGATOR
EFFECTIVITY
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DME SYSTEM - INTERROGATOR
DME SYSTEM - INTERROGATOR
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-55-00-007
General
The L-band DME antenna transmits the interrogator output
signal and receives the ground station reply and identification
signals.
Physical Description
The antenna has an o-ring moisture seal and attaches to the
airplane with four screws. The DME and the ATC antennas are
the same and are interchangeable.
Training Information Point
Extra force on the antenna may be necessary to break the
weatherproofing seal. To prevent damage to aircraft skin or
electrical cable at the antenna base, carefully pry around the
antenna with a sealant removal tool.
DME SYSTEM - ANTENNA
EFFECTIVITY
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DME SYSTEM - ANTENNA
DME SYSTEM - ANTENNA
EFFECTIVITY
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DME SYSTEM - ANTENNA
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The navigation (NAV) control panels supply frequency inputs
and test commands to these navigation radios:
* DME
* ILS
* VOR.
When you put a paired VOR or ILS frequency into the navigation
control panel, it also goes to the DME interrogator. The DME
tunes a DME frequency in the range of 108MHz to 117.95MHZ.
Set the frequency on the navigation control panel for these
audio outputs:
* VOR and DME station identification
* ILS and DME station identification.
Operation
The NAV control panels have an active frequency display
window and a standby frequency display window. The
frequency that shows in the active frequency display window
is the frequency that the navigation radios use for operation.
The standby frequency display window shows the next
frequency you will use.
The transfer switch is a momentary action switch. It transfers
the frequency in the standby frequency display window to the
active frequency display window. When you push the switch, the
frequency that is in the active frequency display window
transfers to the standby frequency display window.
The frequency select control is a continuous rotary knob. There
is an inner knob and an outer knob. The outer knob sets the tens
and ones. The inner knob sets the tenth and one hundreth
numbers.
At power up, the frequency displays show the last frequency
entry before power down.
The NAV control panel continuous BITE function monitors the
operation. The NAV control panel shows FAIL in the active and
the standby frequency display windows when there is a failure.
The monitor in the NAV control panel monitors the 28v dc input.
If the monitor does not get the 28v dc, the frequency display
windows are blank.
DME SYSTEM - NAVIGATION CONTROL PANEL
EFFECTIVITY
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