Revision 4 - December 17,1998 Ryan TCAD 9900 Series Page 2-4
2.5 ANNUNCIATOR OUTPUT
An output is provided for a remote indication of traffic on the Display. A switched
ground is available from the Processor Unit. The output can be used for an annunciator
light. The output is grounded when traffic is displayed, and the circuit opens when traffic
is no longer displayed. See Annunciator light, Section VI, for more information.
NOTE: The Annunciator circuit requires a ground. Applying a voltage to this
input can damage the TCAD Processor.
The maximum current through the Annunciator output must be limited to 100mA.
2.6 COOLING
Elevated operating temperatures reduce reliability. Forced-air cooling is not required,
however, allow sufficient space around the Display to allow adequate convective cooling.
2.7 ANTENNA PLACEMENT CONSIDERATIONS
The top antenna is the primary antenna for the TCAD, and should be mounted as high up
and as far forward as practical, normally directly above the cockpit. Mounting the antenna
aft of this location will usually result in unsatisfactory performance. The antenna should
be a minimum of six inches aft of the windshield, with a minimum of six inches of
undisturbed ground plane around the antenna.
The bottom antenna requirements are less strict, but should be toward the front of the
aircraft and at least 36 inches from other L-band transmitting antennas. See Paragraph
2.13 for mechanical requirements. Section VI contains additional information on antenna
placement.
The cable lengths for the top and bottom antennas should be equivalent, having matched
attenuation within 0.2dB (matched within two inches). See Paragraph 2.18.
2.8 TRANSPONDER COUPLER
The Transponder Coupler supplies the Processor with a transponder transmit signal.
A Transponder Coupler is required for each transponder. The Coupler is normally
installed near the transponder, behind the instrument panel or in the equipment rack. See
Paragraph 1.7 for recommended interconnect cable type.
See Figure 2-8 for mounting dimensions and Figure 2-17 for installation of interconnecting
cables to the Transponder Coupler.
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