Some RF thoughts, without a whole lot of RF design experience (though I
spent years keeping broadcast transmitters on the air)...
        It seems that DDS would result in a lower chip count than a PLL
synthesizer if you can hit the frequencies you need to hit. I'm just real
impressed with DDS.
        What are you going to do for tuning of the front end as the receive
frequency is changed? One way, of course, is to have a varactor in the
front end BPF and tune it with a voltage from the PIC PWM. It seems like
it'd be difficult to get this to track the LO, though. I like the idea
used in some receivers of having a broad front end filter that covers the
whole band of interest. The first conversion is an up-conversion, which
moves the image frequency way far away from the band you're receiving.
        Just some thoughts. I haven't tried building any of these things. Maybe
some day. Also, I'd some day like to generate SSB totally in DSP. Send in
audio and out comes SSB!

Harold
WA6FDN, but pretty inactive


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Lighting control for theatre and television at http://www.dovesystems.com


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