[aprssig] DIY Spectrum Analyzer (Cable TV boxes 50-850 MHz tuners)

Robert Bruninga bruninga at usna.edu
Fri Apr 29 16:48:48 CDT 2016

Is there any value to a pile of old set-top cable boxes (maybe 30 or more
of them)?

Inside they have the typical DC voltage varactor tuned Cable Tuner modules
that people used to make cheap spectrum analyzers out of.  Lots of articles
back a decade or more ago.

A simple DC voltage could tune them from maybe 50 to maybe 800 or higher
MHz.  Output was probably around 50 MHz (Ch 3?)

Should I bring them to Dayton?  Or chuck-em.

Bob, WB4aPR
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