On Sun, 2004-07-11 at 21:15 +0100, rolf heidenborg wrote: > Have I missed something ? Is RTTY a hardware function and not a > software managed with help of soundcard function in the K2 ?
RTTY uses FSK (frequency shift keying), which consists of shifting a carrier between two frequencies. Some radios have an FSK mode where the radio will generate the carrier, and shift it according to a digital input from a TNC or a computer serial or parallel port. Kind of like CW - the rig generates the carrier, it's controlled by a digital input (a key). If a rig doesn't have an FSK mode, you can use a TNC or computer soundcard to generate the carrier at audio frequencies, and feed it into the mic input. This is usually called AFSK (the A stands for audio). Properly generated AFSK is indistinguishable from FSK. -- 73, Brian VE7NGR _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
