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Chapter 7 Plug-in Modules
44472A Dual 4-Channel VHF Switch Module
4
7
44472A Simplified Schematic
A simplified schematic is shown below. The 44472A VHF Switch module
contains of two groups (GROUP 0 & GROUP 1) of 4-to-1 coaxial MUXs.
The two groups are isolated from each other and also from the
mainframe chassis ground to eliminate ground loops. Furthermore, the
shield (or low) of each channel is NOT switched; the shields of the four
channels in each group are in common. A tree relay scheme is used to
provide higher isolation between channels and from open channels to
common. Channels are numbered as 00 through 03 for group 0, and 10
through 13 for group 1.
NOTE: GROUNDS ARE NOT COMM
BETWEEN GROUP 0 AND GROUP 1
COMMON 0
CHANNEL 3
CHANNEL 2
CHANNEL 1
CHANNEL 0
GROUP 0
COMMON 1
CHANNEL 13
CHANNEL 12
CHANNEL 11
CHANNEL 10
GROUP 1
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