[time-nuts] Sound Card Spectrum Analyzer

Gerhard Hoffmann dk4xp at arcor.de
Fri Feb 19 09:29:54 UTC 2010

Bob Camp wrote:
> Hi
> Ok, A bit more info:
> 1) Quadrature PLL using an RPD-1 DBM and a home brew lock box. 
> 2) Willingness to accept that I'm measuring a pair of oscillators
> 3) Plenty of sources at the appropriate frequencies
> 4) First took a shot at this in 1975 (I forget the Fluke app note number ...) been doing it ever since
> 5) Appropriate preamp between the RPD and sound card is a work in progress

I have built this preamp for this purpose:



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