[time-nuts] Software defined spectrum analyzer

[John Miles]

> Hi Don.
>
> I'm ultra curious of how they did it. How did they covered the
> full BW they have.
> Did you looked inside, or did they sent a block diagram?
> (...I was born curious... it is not a new symptom!)

Page 27 of their manual at http://www.signalhound.com/manual.pdf has a block
diagram.  The first LO for VHF and up is the ADF4350 wideband synth (138
MHz-4.4 GHz, -86 dBc/Hz @ 10 kHz at 3.3 GHz).  Baseband processing is done
with an AD9864 IF digitizer.  The ADF4007 is used as a secondary divider for
the ADF4350 output, as part of their image-rejection scheme.

-- john, KE5FX