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12-5 kHz channels AFSK amateur radio amateur stations amplifier amplitude modulation AMSAT AMTOR antenna ARRL audio bandwidth baud Britain broadcast bulletins bytes cable call sign Canada carrier character code circuits colour communications contacts digipeaters dipole facsimile feeder Figure filter frame frequency modulation frequency shift GMT GMT ground plane ground station HF bands impedance input ionized Island Klingenfuss layer licence Maritime mobile MHz band MHz beacons MHz Downlink Mobile Tx mode Morse normally operation orbit oscillator packet radio picture polarized produce propagation Q code radiation radio amateurs radioteletype RAYNET receiving station reception repeater Republic RSGB RTTY Russia scan television sending sent sequence simplex Single sideband SINPO sunspot symbol telephony tone transmission transmitted transponder Uplink utility stations vertical VHF and UHF wave wavelength zone