For a simple transmitter, how about a sound card mode that uses the sound card in STEREO mode with I and Q components on L and R channels, feeding two balanced modulators, and build a phasing-type exciter to do J2D type emissions?
Maybe not quite as simple as AM, DSB, or NBFM, but probably pretty close. A companion receiver could use the same scheme to produce a simple I and Q output to feed to a sound card. And no crystal filters on either one... - ps kd4e wrote: >> Interesting. Run PSK on AM and you get two sidebands for diversity >> reception and a pilot carrier. This could make building small PSK rigs >> easier... >> Leigh/WA5ZNU > > What about DSB or NBFM, same result? >
