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I believe it is pretty much standard that the Mark is the lower RF
frequency. For AFSK using a SSB transmitter that means that the audio Mark tone is the higher frequency and the transmitter is set to LSB which inverts it to the lower RF frequency. For amateur and most commercial operation, the RF Mark frequency is generally given as the assigned frequency. The military uses the center, half way between Mark and Space as the assigned frequency. Because they assign channel frequencies as the center of the assigned bandwidth, this always puts the FSK signal in the center of the channel. |
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