User's Manual

Model 1150A DVOR
9-10 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.
Figure 9-6 VOR Obstruction Light Interconnect Diagram without Photo Sensor
9.5.18
Cutting Antenna Cables to Proper Electrical Length
The RF cables from commutator to the antenna cables are precut and phased matched at the factory. It is
recommended that the cables remain at the length set by the factory. Excess cable should be neatly stored outside the
shelter. The cables must be firmly held by tie wraps (provided) to prevent damage to stress caused by wind gusts.
If the cables must be cut then a vector voltmeter or network analyzer must be used to verify that all the cables are
within +/-2 degrees.
NOTE
A common mistake in cutting or measuring cable phase results in one or more cable with a phase
length 180 degrees different than all other cables. To check for this mistake check cable length at
50% of the station frequency. All cables should then be the same length and any that were in error
by 180 degrees at station frequency will now be in error by 90 degrees at 50% of the station
frequency.
9.5.19
Tuning the Antennas
Refer to Section 9.4.6 of the DVOR Antenna Manual.
9.5.20
Sideband RF Feed Cables to Commutator Connections
Using Figure 9-7 as a guide attach all sideband antenna RF feed cables to the right or left commutator CCAs as
required. The odd numbered antennas are connected to the left side as viewed from the rear of the cabinet and the
even numbered antennas are connected to the right side of the cabinet.
NOTE
If the DVOR is co-located with a DME, it is advisable to also run the DME RF cables and
obstruction light power cable at this time.