Revision 4 - December 17,1998 Ryan TCAD 9900 Series Page 2-19
2.17 ELECTRICAL WIRING OF TRANSPONDER COUPLER
The Transponder Coupler connectors are type-N for the transponder antenna cable
connections, and BNC for the output to TCAD. Refer to Figure 2-8 for coupler size, and
Figure 2-14 or Figure 2-15 as appropriate for wiring. Refer to Figure 2-17 for cable
fabrication and connection.
NOTE: Route the coupler cable away from possible sources of EMI such as DME,
transponder cables, suppression lines from other equipment or high-current
power cables.
A. The coaxial cable going from the transponder to the transponder
antenna may be cut anywhere along the cable length, and install type-N
plug connectors appropriate for the coaxial cable size. Type-N
connectors for small diameter coaxial cables are supplied, and type-N
connectors for larger diameter (RG-8, etc.) cables are available on
request. The transponder coupler should be installed in an accessible
location.
B. Connect the cable end from the transponder antenna to the coupler
connector marked “ANT.”
C. Connect the cable end from the transponder to the coupler connector
marked “XPDR”.
D. Prepare a 50 ohm coaxial cable, going from the coupler to the
Processor, with BNC plug connectors on both ends. Connect one end
of this cable to the Coupler BNC connector labeled “TCAD,” and
connect the other end to the Processor BNC connector marked
“COUPLER”.
E. For dual transponder installations, use two Transponder Couplers.
Connect the Coupler outputs that would normally go to the Processor
to a BNC T-adapter. Then connect the coaxial cable from the T-adapter
to the Processor (See Figure 2-15).
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