1-4
GTX 327 MAINTENANCE MANUAL
Rev B
190-00187-05
1.3.4
Radar Screen, TCAS Display
The radar screen displays returns from both the primary surveillance radar system and the ATCRBS. The ATC
system controllers use these returns, called targets, to identify traffic. Similarly, the TCAS display indicates the
presence of airborne traffic showing direction, distance and altitude.
1.3.5
Mutual Suppression Pulses
Other equipment on board the aircraft may transmit in the same frequency band as the transponder, such as DME
or another transponder. Mutual suppression is a synchronous pulse that is sent to the other equipment to suppress
transmission of a competing transmitter for the duration of the pulse train transmission. The transponder
transmission may be suppressed by an external source and other equipment on board may be suppressed by the
transponder. This feature is designed to limit mutual interference.
1.4
TECHNICAL SPECIFICATIONS
Refer to the GTX 327 Installation Manual for a complete list of specifications.
SPECIFICATION
CHARACTERISTIC
TSO, JTSO
TSO C74c Class 1A, JTSO-C74c Class 1A
RTCA/DO-160D
Refer to GTX 327 Installation and Operation Manual,
190-00187-02, Appendix A
Power Requirements
11.0 to 33.0 Vdc; Power Input: 15 Watts typical, 22 Watts
maximum
Transmitter Frequency
1090 MHz
Transmitter Power
125 Watts minimum, 150 Watts nominal at the antenna
through 1.5 dB coax.
Receiver Frequency
1030 MHz
Receiver Sensitivity
-74 dBm Nominal for 90% replies*
Mode A Capability
4096 Identification Codes
Mode C Capability
100 Foot Increments from –1000 to 63,000 feet
External Suppression Input
Low
≤
0.5 V; High
≥
8 V
*
Units P/N 011-00490-00 prior to S/N 83707331, P/N 011-00490-01 prior to S/N 83925021 and
P/N 011-00490-10 prior to S/N 84000116 have an MTL of -72 dBm.
The document reference is online, please check the correspondence between the online documentation and the printed version.
