AFSK is a bit trickier to set up and use, but when it is done correctly, it works just as well as FSK and will transmit a perfect RTTY signal. AFSK can be used with any SSB transmitter. Since not all transmitters support FSK input, there is another method available – AFSK. Check your owner’s manual if you’re not sure. FSK is simpler, easier and more foolproof than AFSK and is highly recommended if your transmitter supports FSK input. This signal may come from a TNC (Terminal Node Controller) such as a Kantronics KAM, an AEA PK-232, HAL DXP-38 or some other, or it may come from a soundcard program via one of your computer’s com ports. With FSK, your transmitter receives a simple on-off signal which causes the carrier frequency to shift back and forth. So what is the difference? It’s the way your transmitter generates the RF signal. If the transmitter is operating properly, the station receiving the RTTY signal can not tell any difference at all. MARK is always the higher RF frequency and SPACE is always the lower RF frequency. Regardless of which method is used, the RF signal sent out over the air is identical. FSK means Frequency Shift Keying and AFSK means Audio Frequency Shift Keying. You will often hear the terms FSK and AFSK when talking about RTTY on the HF bands.
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