190-00906-01 GTX 23 Installation ManualRev. C Page 3-43.8.3 Performance (Ramp) TestCAUTIONIf the unit is removed from the aircraft and operated, always connect J2302 to anantenna or a 50 Ω, 5-Watt load. The GTX 23 transmits Mode S acquisitionsquitters about once per second whether interrogations are received or not. Theunit may become damaged if J2302 is not connected to a 50 Ω, 5-Watt load whenthe unit squitters,Installations require verification of proper operation of the transponder by testing as specified inAppendix F of 14 CFR, Part 43, to AC 43-6B, and/or other appropriate regulations. The test is typicallydone as a ramp test using a transponder ramp test set, such as the TIC TR-220, IFR ATC-601 or othersuitable Mode S transponder test set. The ramp test includes checks as follows:Reference Part 43 Appendix F:a. Reply Frequencyb. Suppressionc. Receiver Sensitivityd. Reply RF Output Powere. Mode S Diversity Channel Isolation (if applicable)f. Mode S Addressg. Mode S Formatsh. Mode S All-Calli. ATCRBS –Only All Callj. SquitterReference AC 43-6B and 14 CFR Part 43, Appendix E (c):a. Altitude Reporting3.9 Continued AirworthinessInstallations are required to test according to Title 14 CFR §§ 91.411 and 91.413 as well as Part 43Appendix F. Otherwise, maintenance of the GTX 23 is ‘on condition’ only.
