Rev E TR-220 90 008 088-1
2-9
2.9.2 Direct Connect
The Direct Connect Cable, supplied with the Test Set, allows the operator to conduct
transponder tests directly from the transponder under test. Utilizing the direct connect
method eliminates possible antenna and cable losses and ensures the operator the
transponder is operating at its full potential. The TR-220 has a built in 50 dB attenuator,
thus eliminating the need to connect an external attenuator for power and frequency
measurements. Simply connect the supplied cable from the test set to the transponder to
be tested. Ensure that if your transponder has multiple antennas (diversity equipped), to
terminate the second antenna to prevent damage to the transponder.
If you are not using the Direct Connect method, but the directional antenna method, you
must install the supplied termination cap on the DIRECT CONNECT port. If it is not
properly installed, the Test Set display will prompt the operator to remove the antenna.
Before testing utilizing the supplied Direct Connect cable, the operator must enter the
appropriate cable loss to ensure accurate measurements.
1. Access the ANT GAIN menu by turning the Test Set “ON” with the UUT FUNCTION
switch in the SETUP position. Locate the Cable Loss menu by toggling the
AUTO/MANUAL switch. Enter the correct values that are affixed to the supplied
cable by using the UP/FWD, DOWN/REV switch. If you are using a different cable, it
is important to know the cable loss value or inaccurate results will occur. Once
completed, turn “OFF” the Test Set or toggle to AUTO switch. The value will remain
in the Test Set memory. You will only need to reenter the value if another cable is
utilized or it is repaired.
Measurements utilizing the direct connect method have an accuracy of ± 2 dB.
2.9.3 TAP-200 Antenna Coupler (Optional)
The TR-220 can be used with the (optional) TAP-200 Anti Radiation Antenna Coupler for
testing transponders (fig 2-5). The Antenna couplers provide a limited amount of
attenuation, approximately 20 dB, to prevent the transmission of the transponder signal
into the airspace above the aircraft under test. The Antenna Couplers may only be
utilized on blade type antennas.
Direct Connection
REMOVE ANTENNA
Cable Loss: 1.8 dB
Chg: Up/Dn Cont:AUTO
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