HF FSK is full power carrier. 100% duty cycle while transmitting. The AFSK SSB mode is linear and the signal level is controlled buy the audio drive level which must be held below the saturation point of the transmitter stages.
Bob Macklin K5MYJ Seattle, Wa. "Real Radios Glow In The Dark" ----- Original Message ----- From: "Dave Ackrill" <dave.g0...@tiscali.co.uk> To: <digitalradio@yahoogroups.com> Sent: Thursday, February 18, 2010 3:27 PM Subject: Re: [digitalradio] Re: Introduction and question > sholtofish wrote: >> Following on from this thread and reading some of Peter's comments makes >> me wonder what method is best for 300 baud HF packet with a TNC? FSK or >> AFSK? Or won't it make any difference? Will FSK result in a wider >> bandwidth? > > The main advantage of FSK, so I am led to believe, is that some radios > allow better filtering as standard for FSK than the SSB system used for > AFSK. > > I don't think that either is, necessarily, wider bandwidth. Unless > there's some problem with the audio drive for the 'A' in AFSK. > > Both should be the same in terms of baud rate and the spacing between > the Mark and Space ratio, I would think. > > Dave (G0DJA) > > > ------------------------------------ > > Try Hamspots, PSKreporter, and K3UK Sked Page > http://www.obriensweb.com/skedpskr4.html > Yahoo! Groups Links > > >
