[time-nuts] Super stable BVA Quartz resonators... BVA??

[Alan Melia]

Berndt I believe you are describing a "Triax" connector I found them through
Trompeter but I believe they are sold by Farnell and RS Components in the
UK. The same connector was used I think on some of the HP system digital
voltmeters.
Cheers de Alan G3NYK

----- Original Message -----
From: "Bernd T-Online" <BNeubig at t-online.de>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Sunday, December 09, 2007 2:21 PM
Subject: Re: [time-nuts] Super stable BVA Quartz resonators... BVA??


> Tim Shoppa wrote:
> > For a while, didn't HP sell temperature probes which were in fact
> > quartz crystals? Oscillation frequency was converted by some simple
> > electronics to a temperature, and at the time (60's?) they were
> > exquisitely convenient for measuring way better than a tenth of a
> > degree.
> > Either the frequency drift was negligible or it
> > was so slow that I don't remember any manual removal of frequency
> > drift effects.
> > I'm guessing the probe crystals were some special cut (don't know
which!)
> > which was fairly linear or at least monotonic over the measurement
> > temperatures. I'm guessing that HP chose a cut which had a very large
> > tempco such that tempco dominated over any frequency drift.
>
> They did indeed. This was the HP2801A, later followed by the HP2804A.
> It uses a so-called LC-cut (Linear Coefficient) quartz crystal sensor,
> which is a doubly rotated cut with ultra-linear frequency vs.
> temperature characteristic with a slope of 35.4 ppm/K.
>
> For more information see http://hparchive.com/Journals/HPJ-1965-03.pdf
>
> BTW: I proudly own a HP2801A plus two crystal sensor elements. However I
> cannot connect them to the instrument, because the 2801A has a special
> connector for it. It looks like a smaller version of a BNC connector,
> but the bayonet has three "nipples" instead of two. Does anyone on the
> list know what kind of connector that is and where to get the
> counterpart (plug)?
>
> Regards
>
> Bernd
> DK1AG
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.