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Types of Modulation
Structure of a Shortwave Radio Link
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5-unit code 50 bauds amplitude amplitude modulation antenna ARQ system ARQ terminal automatic bandwidth bauds bit error rate Block diagram carrier character error rate check information Class of emission code combinations coder connection data protection systems data transmission decoder delay demodulator diplex diversity method diversity reception employed encryption error bursts error detection facsimile falsified forward error correction frequency modulation frequency shift frequency-shift keying input circuit interference keying message transmission modulation rate noise output circuit phase picture frequency protection methods radio circuits receive branch receiving end receiving station repetition cycle repetition request RQ signal RT Radio transmitter shift register shortwave links shortwave radio links shortwave range shown in Fig sideband signal element signal-to-noise ratio space diversity start-stop stop polarity subscriber synchronizer telegraph and data telegraph speed teleprinter telex terminal equipment traffic transmission channel transmission path transmit branch types of transmission voice-frequency telegraph wave WTK channel