El 09/03/2010 21:15, rein...@ix.netcom.com escribió: > Sorry Ralph, > > I did not read the header..... > > > &3 Rein W6SZ > > -----Original Message----- > >> From: Ralph Mowery<ku...@yahoo.com> >> Sent: Mar 10, 2010 12:25 AM >> To: digitalradio@yahoogroups.com >> Subject: Re: [digitalradio] Re: Question for experts >> >> If you are doing what I think, you have just built a complicated CW >> transmitter. Start with a crystal oscillator, go to a ballanced modulator >> and then filter out one sideband. >> This is similar to how cw is often generated in a SSB transceiver. >>
Well, actually FSK or ASK of two tones is hard to tell from each other "on the air". A friend built such a modem, I contributed a couple of ideas, using ASK with TTL logic to key a solid state laser from a crystal derived clock. The optical link worked flawlessly. What you see as result of using your example are random frequency and amplitude tones in the spectral display, sometimes simulteneously, sometimes, not. So, what? 73, Jose, CO2JA
