At 10:16 AM +0000 1/4/12, [email protected] wrote:
Date: Wed, 04 Jan 2012 00:58:24 -0800
From: Hal Murray <[email protected]>
To: Discussion of precise time and frequency measurement
<[email protected]>
Subject: Re: [time-nuts] crunching numbers from XOR phase detector
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<[email protected]>
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Neat. Thanks for sharing.
With a XOR, you can't tell which input is higher frequency. I think you can
fix that with a second XOR and a delay line.
I think 90 degrees of delay will provide the most information. At 10 MHz,
that's 25 ns. I think that's about 15 feet of good coax.
Beware of teflon dielectric cable, as the teflon knee is centered
around room temperature, making delay cables of teflon quite
sensitive to slight changes in temperature.
<http://www.micro-coax.com/pages/technicalinfo/applications/27.asp>
Joe Gwinn
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