User's Manual

Model 1150A DVOR
2-72 Rev. - November, 2008
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Table 2-2 VOR Ground check Offset Table
Antenna #
(0-47)
Ground Check
(GCSC4..1)
Final Antenna #
(0 -47)
Antenna #
(0-47)
Ground Check
(GCSC4..1)
Final Antenna
#(0-47)
1 0 1 4 0 4
1 1 4 4 1 7
1 2 7 4 2 10
1 3 10 4 3 13
1 4 13 4 4 16
1 5 16 4 5 19
1 6 19 4 6 22
1 7 22 4 7 25
1 8 25 4 8 28
1 9 28 4 9 31
1 10 31 4 10 34
1 11 34 4 11 37
1 12 37 4 12 40
1 13 40 4 13 43
1 14 43 4 14 46
1 15 46 4 15 1
2 0 2 \ \ \
2 1 5 \ \ \
2 2 8 \ \ \
2 3 11 47 0 47
2 4 14 47 1 2
2 5 17 47 2 5
2 6 20 47 3 8
2 7 23 \ \ \
2 8 26 \ \ \
2 9 29 47 14 41
2 10 32 47 15 44
2 11 35
2 12 38
2 13 41
2 14 44
2 15 47
2.3.2.23 Commutator CCA (1A10, 1A11) Theory
The Commutator CCA measures 15-7/8" high and 14-7/8" wide. There are two Commutator CCAs installed in the
electronics cabinet. They are located on the upper left and upper right side of the cabinet and may be accessed by
removing the side panels of the transmitter cabinet. The right (viewed from the front) Commutator CCA is used to
switch the RF signals to all the odd antennas, and the left Commutator CCA drives the even antennas. Each
Commutator has twenty-six N type RF connectors and two 37-pin D-shell connectors.
2.3.2.23.1
Commutator CCA Block Diagram Theory
Refer to Figure 2-27. There are two Commutator CCAs installed in the Commutator rack, one to switch the RF
signals to all the odd antennas, and the other to drive the even antennas. Since both CCAs perform exactly alike, the
discussion is limited to the odd antenna switch circuit board.
To simplify the interconnection of the signals and antennas used in the 48 antenna system, Table 2-1 is available as
an aid. The pin numbers of the 012257 Pin Driver CCA and the 012702 Commutator do not match due to the
different styles of connector (i.e. 40 pin dual row on the backplane and 37 pin D type).