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822-1293-322
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Model Number: TTR921
Description: TCAS RCVR/TRANS
Manufacturer COLLINS
Alternate Part Number
National Stock Number
Categories Receiver-Transceiver
Repair Capabilities YES
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Stock 0

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Product Details

The TTR-921 Transmitter-Receiver contains circuits for receiving, transmitting, signal processing (including computing), and interfacing with other components of the TCAS-94 system. A frequency source generates 1030 MHz for the transmitter output and receiver local oscillator with a receive frequency of 1090 MHz. The receiver has four individual RF and IF sections, one for each of the four directional segments of the TRE-920 directional antenna. At the receiver detector, the signals are combined to allow received-signal bearing information to be determined. This information is passed to the signal processor. The transmitter is a six-stage, solid-state circuit that develops 1800 watts. The phase of the four output signals shapes and points the beams, or generates an omnidirectional pattern. The TTR-921 requires two antennas; one must be mounted on top of the aircraft fuselage and the other on the bottom.

All TTR-921 units require ARINC 429 control format. Control data is generated in the TCAS control and is supplied through the active Mode S transponder. The TTR-921 is 7.64 inches in height, 7.77 inches in width, 15.26 inches in length, and weighs 18.5 pounds max requiring convection cooling and not forced air.

Part Number Differences:
Part NumberSB InstalledVoltage PowerSoftwareReplacement Part NumberSpecific Aircraft Usage
822-1293-0011-16, A, B, C115 VAC, 400 Hz or 28 VDCChange 7.0822-1293-002Boeing version of maintenance computer interface information
822-1293-0021-16, A, B, C115 VAC, 400 Hz or 28 VDCChange 7.0Can be Upgraded to 822-1293-033Boeing version of maintenance computer interface information
822-1293-0031-16, A, B, C, 502115 VAC, 400 Hz or 28 VDCCan be Upgraded to Change 7.1Can be Upgraded to 822-1293-033Boeing version of maintenance computer interface information
822-1293-0331-16, A, B, C, 504115 VAC, 400 Hz or 28 VDCChange 7.1Upgraded from 822-1293-002 and 822-1293-003Boeing version of maintenance computer interface information
822-1293-2201-16, A, B, C115 VAC, 400 Hz or 28 VDCChange 7.0Not ApplicableBoeing version of maintenance computer interface information
822-1293-3201-16, A, B, C115 VAC, 400 Hz or 28 VDCChange 7.0Not ApplicableAirbus version of maintenance computer interface information
822-1293-3211-16, A, B, C115 VAC, 400 Hz or 28 VDCChange 7.0Not ApplicableAirbus version of maintenance computer interface information
822-1293-3221-16, A, B, C, 501115 VAC, 400 Hz or 28 VDCCan be Upgraded to Change 7.1Can be Upgraded to 822-1293-332Airbus version of maintenance computer interface information
822-1293-3321-16, A, B, C, 504115 VAC, 400 Hz or 28 VDCChange 7.1Can be Upgraded to 822-1293-332Airbus version of maintenance computer interface information