Viavi AVX-10K Operation Manual page 264

Antenna Coupler Usage for Transponder Diversity Testing
NOTE: This procedure describes typical diversity transponder testing. Actual steps to
be followed might be outlined in the aircraft maintenance manual. If that is the case,
the maintenance manual should be followed.
For transponder diversity testing, two UC-584 couplers will be needed along with a short
coaxial cable and a 50-ohm load. The AVX-10K-CNS kit comes with two couplers – a
UC-584 and a UC-584S. The UC-584 coupler is typically used on bottom mounted
antennas as it has a clamping mechanism to hold it in place. The UC-584S is typically
used on top mounted antennas as it has a hooking mechanism that a pole can be attached
to the coupler in order to lower it onto a top antenna.
To connect the UC-584 coupler to the aircraft antenna:
1) Please coupler over the antenna, guiding the antenna into the slot of the coupler.
2) Push the coupler firmly against the aircraft until the gasket material on the rim of
3) Lock the coupler into place by pushing the lever on the side of the coupler into the
NOTE: Coupler must be tightly pressed and locked in place for the AVX-10K test set to
function properly. If not, the measurement functions may not be accurate.
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the coupler is completely depressed tightly against the aircraft.
locked position.
AVX-10K Operation Manual
Figure F-7 Antenna Couplers
Chapter F Standard Accessories and Procedures
Appendix F. Standard Accessories and Procedures
Rev 004
F - 7