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| R (readability | R1 to R5 |
| S (Signal strength) | S1 to S9 |
| T (Tone) | T1 to T9 |
The phonetic alphabet is meant as an aid to the spelling of a call sign or word, and must be learned.
Repeaters are to relay FM signals in the VHF and UHF bands. Access is normally gained by a tone-burst at 1.75kHz for 0.5 seconds. Satellites allow long distance communication, and they operate in a number of modes.
Safety is of obvious prime importance. Good earthing, adequate mains isolation and correct maintenance procedures are paramount.
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| Some material Copyright John Bowyer G4KGS. |
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