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:
<http://www.hoffmann-hochfrequenz.de/downloads/preliminary_ssm2210.zip>
Gerhard
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