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From: cyamamot@nunki.usc.edu (Cliff Yamamoto)
Newsgroups: sci.electronics,rec.ham-radio
Subject: A digital Panadaptor (Spectrum Analyzer) for under $300
Keywords: DSP, A/D, low cost
Message-ID: <2153@nunki.usc.edu>
Date: 14 Dec 88 14:49:23 GMT
Reply-To: cyamamot@nunki.usc.edu (Cliff Yamamoto)
Organization: University of Southern California, Los Angeles, CA
Lines: 16


	I would like to know if anyone has attempted to make/sucessfully made
a homebrew analyzer in the digital domain.  The ouput would be a list of freqs
within the spectrum that exceed a preset level. The vertical resolution doesn't
have to be good, an 8-bit video A/D @50MHz should be fine for 10.7 or 21.4Mhz
IF signals.  And the horizontal resolution has to only be 5kHz (just to pick
up NBFM or AM signals at least).

	However, if I want (somewhat) real-time capability, don't I need a
fast DSP chip?  Provided the A/D, memory & DSP cost doesn't exceed $300, how
much more support circuitry is needed?

	Any pointers toward helpful books/magazines or suggestions for parts,
construction and implementation would be appreciated.  I hope a project like
this at such a cost is not too far fetched.

Cliff Yamamoto