HF Communication Trials with BOAC Aircraft on the Polar Route.
ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (ENGLAND)
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Results are presented from a series of trials over a twelve month period between BOAC Boeing 707 aircraft on the polar route to Tokyo and Cove Radio Station RAE. Long term frequency predictions proved successful in maintaining a high level of successful contacts 94 of calls at ranges up to 2200 nautical miles during day and night. Graphs are presented of the variation of recieved signal levels over the year at different ranges, together with the distribution of fading depths and periods. The results show that, for most of the hear, although adequate for the transmission of routine voice messages, signal to noise ratios on the air-to-ground link leave little in hand for more complex traffic. Directional receiving aerials are essential. Author
- Radio Communications