[Premium-Rx] SDR as a means of decoding low-frequency IF output of premium receivers

Charles P. Steinmetz charles_steinmetz at lavabit.com
Sun Oct 9 18:35:59 EDT 2011


Pierre wrote:

>This receiver has an IF ouput jack (of 30kHz). Rather than
>using an SDR with Tayloe QAD detector, I am looking now
>for a direct input of that signal into an A/D converter and
>processing/decoding most modes

Allowing for sidebands above the nominal 30 kHz IF, you will need an 
A/D converter running at 100 kilosamples/second or more.  This is 
well within state-of-the-art for A/D converters, but it is 
substantially faster than one usually sees in sampled-IF radios today 
(i.e., it would require more A/D performance and more DSP horsepower 
than designers normally use).

Do you intend to design your own sampled IF using an A/D or DSP eval 
board (or your own board design), or were you looking for a 
plug-and-play solution that someone has already developed?

Best regards,

Charles








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