User's Manual

Model 1150A DVOR
Rev. - November, 2008
This document contains proprietary information and such information may not be disclosed
to others for any purposes without written permission from SELEX Sistemi Integrati Inc.
6-9
l. S
elect screen Monitors>>Data>>Sideband Antenna VSWR, observe odd numbered Antenna VSWR. The
displayed VSWR should be between 1.20 to 1.27 for odd numbered antennae. If not within range then the
1A4A1 Sideband amplifier (with built-in VSWR measurement circuitry) should be replaced.
m. Turn both transmitters off. Move the load barrel, bullet, and TEE to the Sideband 2 feed cable at 1A10J25.
n. Turn on both transmitters. Select screen Monitors>> Data>> Sideband Antenna VSWR, observe even
numbered Antenna VSWR. The displayed VSWR should be between 1.20 to 1.27 for even numbered
antennae. If not within range then the 1A4A1 Sideband amplifier (with built-in VSWR measurement
circuitry) should be replaced.
o. Turn off both transmitters. Remove termination, TEE and bullet. Place cables in their original positions.
p. Turn the system on and clear the bypass condition by clicking by clicking on the bypass button.
6.4.6
Verification of BITE Frequency Counter Calibration
a. Turn off AC/DC power.
b. Remove Transmitter 1 Audio Generator 1A3A2 and place on an extender CCA.
c. Turn on power. Log onto the PMDT and turn on Transmitter 1 by clicking the Tx 1 Antenna Button on the
side bar.
d. Connect a frequency counter probe to TP24 on 1A3A2.
e. Observe the 30 Hz AM frequency on Transmitter Data >> Transmitter 1 and verify it is within ±1.0% of
the reading from the frequency counter.
f. Connect the external frequency counter to 1A3A1-J2 on the Transmitter 1 Synthesizer.
g. Observe the Carrier frequency on Transmitter Data >> Transmitter 1 and assure it is within ±1.0% of the
reading from the frequency counter.
h. Turn off AC/DC power on VOR front panel. Remove the Audio Generator 1A3A2 CCA from extender. Put
the Transmitter 2 Audio Generator CCA 1A3A9 on extender.
i. Turn on AC/DC power on VOR front panel. Change operating transmitter to 2 by pointing to Tx 2 antenna
on the sidebar..
j. Connect a frequency counter probe to TP24 on 1A3A9.
k. Observe the 30 Hz AM frequency on Transmitter Data >> Transmitter 2 and verify it is within ±1.0% of
the reading from the frequency counter.
l. Connect the frequency counter to 1A3A11-J2 on the Transmitter 2 Synthesizer.
m. Observe the Carrier frequency on Transmitter Data >> Transmitter 2 and assure it is within ±1.0% of the
reading from the frequency counter.
n. Turn off the power and remove Transmitter 2 Audio Generator CCA 1A3A9 from extender and place the
Audio Generator CCA back into its original position.
6.4.7
Verification of BITE Wattmeter Calibration
a. Point and click the of f button to turn off both VOR transmitters
b. Insert a 250 Watt plug-in element into the thru-line wattmeter body in the carrier feed cable.
c. Point and click the Tx 1 antenna button to turn on Transmitter. Point and click the Bypass button to place
the transmitter in BYPASS.
d. Select screen Transmitters >> Data>> Tx 1, observe Carrier power output. The displayed output is to
coincide with the external wattmeter indication.
e. If the levels are not the same, carefully adjust (on the 1A4A4 RF Monitor Assembly) the CSB FWD
potentiometer, 1A4A4R1 (CSB FWD ADJ). Turning the pot clockwise will decrease power reading and
counterclockwise will increase.
f. Point and click the off button to turn off both VOR transmitters.
g. Insert a 5 Watt plug-in element into the thru-line wattmeter body in the Sideband 1 feed cable, 1A11J25.
h. Turn on Tx 1. Select screen Transmitters>> Data>> Tx 1. Observe Sideband 1 power output. The displayed
output power is to coincide with the external wattmeter indication.
i. If the levels are not the same, carefully adjust the Sideband 1 forward power detector potentiometer
1A4A1R2 located on the Sideband Generator Assembly.
j. Point and click on Tx 2 Antenna button to change Transmitters.
k. Select screen Transmitters>> Data>> Tx 2. Observe Sideband 1 power output.