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190-00906-01 GTX 23 Installation Manual
Rev. C Page 1-4
1.5 Mutual Suppression Pulses
Other equipment on board the aircraft may transmit in the same frequency band as the transponder. DME,
TCAS, or another transponder are examples of equipment that operate in the same frequency band. 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 transmission. The transponder transmission is suppressed by
an external source, and other equipment on board that transmit in the same frequency band are suppressed
by the GTX 23 transponder. This feature is designed to limit mutual interference.
1.6 Interface Summary
The GTX 23 provides the following interface connections via the rear connector. See Section 4 and
Appendix C for connection details.
• External IDENT input
• External STBY input (useful for dual transponder installations)
• External mutual suppression pulse input/output
• Aircraft power input (14/28 Vdc)
• RS-232 input #1 connection for altitude and unit control data
• RS-232 output #1 connection for TIS and unit status
• RS-232 input #2 connection for GPS data for ADS-B
• Supports Comm-A and Comm-B protocol
• ARINC 429 outputs for TIS data
The GTX 23 supports the following list of Comm-B Definition Subfield (BDS) registers:
• BDS (0,0) Air Initiated Comm-B (AICB)
• BDS (1,0) Data Link Capability Report
• BDS (1,7) Common Usage Ground Initiated Comm-B (GICB) Capability Report
• BDS (1,8) Mode S Specific Services GICB Capability Report
• BDS (1,9) Mode S Specific Services GICB Capability Report
• BDS (1,D) Mode S Specific Services Protocols (MSP) Capability Report
• BDS (2,0) Aircraft Identification
• BDS (4,0) Selected Vertical Intention
• BDS (5,0) Track and Turn Report
• BDS (6,0) Heading and Speed Report
• BDS (0,6) Extended Squitter surface Position
• BDS (0,5) Extended Squitter Airborne Position
• BDS (0,8) Extended Squitter Aircraft Identification and Category
• BDS (0,9) Extended Squitter Airborne Velocity – Subtypes 1 and 3
• BDS (0,A) Extended Squitter Event Driven Data
• BDS (6,1) Emergency/Priority Status
• BDS (6,5) Aircraft operational Status