[time-nuts] HP 10811A/B OCXO OP/SRV manual is onlineathparchive.com AND HP 5501B manual.

[Magnus Danielson]

From: Dr Bruce Griffiths <bruce.griffiths at xtra.co.nz>
Subject: Re: [time-nuts] HP 10811A/B OCXO OP/SRV manual is onlineathparchive.com AND HP 5501B manual.
Date: Wed, 08 Nov 2006 11:25:44 +1300
Message-ID: <455107E8.1020201 at xtra.co.nz>

> To measure the Allan variance you need at least 2 (preferably more) 
> stabilised lasers and a mixer (photodiode) plus a suitable amplifier to 
> produce a beat signal for analysis.
> The beat frequency may be as high as 100 MHz with a pair of 5501s 
> (frequency/wavelength accuracy of 0.1ppm) so the photodiode and 
> associated amplifier will need adequate bandwidth.

It seems like three 5501s, optical splitters/joiners and a fairly normal
counters should allow for a three-cornered hat and then should the Allan
variance and friends be possible to measure.

Cheers,
Magnus