Special communications evaluation report

This Special TRACALS Air-to-Ground communications evaluation report is a consolidation and in-depth analysis of the results of four evaluations on Rivet Switch and 4-channel keying equipment. The four evaluations were conducted at Altus AFB, OK, Eglin AFB, FL, Richards-Gebaur AFB, MO, and Vance AFB, OK. Included in this report are important equipment maintenance trends and system problems. The equipment maintenance trends include results of RF frequency accuracy, equipment meter circuit, and other transmitter and receiver test measurements. An alignment procedure for the Rivet Switch/4-channel key systems is presented and can be used throughout the Air Force for alignment and troubleshooting of air-to-ground communications systems. The principles presented in this report are applicable to all TRACALS communications systems. The concepts can be adapted for other transmitter, receiver, audio, and keying equipment.