[time-nuts] Best phase detector / mixer for 100MHz?

Bob Camp lists at rtty.us
Mon Nov 26 20:02:18 UTC 2012


Hi

.... or you could see if somebody with it already in their free time related
program would add a sound card or set of cards to the mix of devices they
support.

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Magnus Danielson
Sent: Monday, November 26, 2012 2:52 PM
To: time-nuts at febo.com
Subject: Re: [time-nuts] Best phase detector / mixer for 100MHz?

Anders,

On 11/26/2012 10:45 AM, Anders Time wrote:
> Thanks a lot guys for all the input!
> The nist articles was a very interesting read. I have ordered the
> minicircuits ZRPD-1 and will try to build the 2N2222A mixer to to see how
> far that will take it. I probably also will build a low noise jfet preamp
> to see if that will reduce the noise. But I probably have to go to build
> myself a crosscorrelation system to be able to<-180dBc with confidence. Is
> there any cheap way into cross correlation measurement, using high quality
> soundcard for example? Or do I have to buy one of these big old expensive
> dual FFT analyzers?

If you can handle the frequency limitation of the audio-card, you can do 
that. Cross-correlation using FFT isn't that hard to achieve, and good 
FFT libraries exist. FFTW for instance and a handfull lines of code do 
it all.

Cheers,
Magnus

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