January 1974 | NTIA Technical Memo OT TM 74 183
May 1975 radio propagation predictions for U.S. lnformation Agency, Voice of America broadcast coverage, Vols. I and II,
Abstract: VOLUME I: HF radio propagation predictions are calculated for Voice of America circuits using the OT/ITS prediction program. Some of the parameters given are maximum usable frequency, the optimum traffic frequency, the lowest useful frequency, available signal-to-noise ratio, and circuit reliability. VOLUME II: HF radio propagation predictions are calculated for 35 circuits from the Voice of America transmitting facility at Tinang, P.I., 30 circuits from their facility at Kavala, Greece, 12 circuits from their transmitting facility at Greenville, N.C., and 21 circuits from their transmitting facility at Wooferton, England, using the OT/ITS prediction program. The program selects the optimum antenna at the facility for each circuit and the antenna identification and gain are listed in the predictions.
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