NELC UHF Tactical Satellite Communications Terminal for Apollo 9, 10, and 11 Recovery Missions.
Technical Document Jan-Aug 69,
NAVAL ELECTRONICS LAB CENTER SAN DIEGO CA
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Simplex FM system -- tested in Apollo 9 recovery operations and used in Apollo 10 and 11 -- consistently established satisfactory voice communication of excellent quality through the TACSAT-1 satellite. The equipment provided for the operation of two simultaneous audio channels on all three missions. Interference to other services was not observed interference from other services was minimal. Performance of a withinband teletype circuit was degraded by mutual interference within the system use of an improved telegraph terminal is recommended. Simplex operation is shown to provide several advantages over duplex operation. Author
- Radio Communications