Rev E TR-220 90 008 088-1
2-41
2.16 DME Tests
The TR-220 is capable of selecting any of the DME frequencies of 108.0 – 117.95 MHz channels.
The Test Set simulates a ground station at an operator selected range and velocity. When the
operator initiates the test, the Test Set range, TO or FROM, will decrease to 0 nmi., and return
back to the pre-selected range. The operator may also freeze the simulation at any point during
the simulation.
The following paragraph will describe the procedure to properly conduct a test of a DME
Receiver. The Directional Antenna is utilized for DME testing.
2.16.1 DME Setup
1. Connect the directional Antenna and follow the procedures as outlined in
Paragraph 2.9.1.
2. Turn the Test Set “ON” by toggling the ON/OFF switch to the ON position. Verify
the green LED is illuminated.
3. Select DME using the UUT FUNCTION switch and verify the following display:
(note that DME velocity will be the last selected velocity).
4. To select the appropriate frequency, place the CHN/ALT-DIST-VERT SPEED
switch in the CHN/ALT position. Using the UP/FWD-DOWN/REV switch, select
the desired DME channel. The operator may select any frequency from 108.00 to
117.95 MHz.
5. To select the range from the UUT, place the CHN/ALT-DIST-VERT SPEED
switch in the DIST position and toggle the UP/FWD-DOWN/REV switch to the
appropriate range. The Test Set range can be varied from 0 – 250 nmi, in 1 nmi
increments (default distance is 50nmi).
6. Select the velocity of the scenario by toggling the INCREASE-DECREASE
VELOCITY switch to INCREASE or DECREASE the AUT velocity (120-1200Kts
in 10 Kt increments).
7. To begin testing, toggle the TO/START-FROM/STOP switch either “UP” or
“DOWN”. By toggling the switch “UP”, the operator will select TO the AUT. The
Test Set will begin decreasing the distance to the AUT at the selected velocity
and display the UUT PRF in Hz.
108.00MHz 350K 0Hz
50.0nmi Ident Hold Τ
108.00MHz 350K 18Hz
47.5nmi Ident ToΤ
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