[time-nuts] HP 10811 "salvage"

Bill Jones, K8CU k8cu at realhamradio.com
Sat Feb 3 02:28:00 UTC 2007


For those interested, the SC cut crystal specs are here:
http://www.realhamradio.com/crystal.pdf

It is a 3rd Overtone not a 5th as I thought. Mine was marked as 70.0-degrees
on the xtal case. A photo I took is attached.

Good luck,

Bill, K8CU

----- Original Message ----- 
From: "Bill Jones, K8CU" <k8cu at realhamradio.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Saturday, February 03, 2007 1:45 AM
Subject: Re: [time-nuts] HP 10811 "salvage"


> You may try a replacement crystal from Jason Kutz. I remember him saying
he
> had 16-years experience as a commercial oscillator designer. He had
several
> hundred crystals and sold a few on eBay last fall. Not an exact physical
> match (his are TO-8 package sans the threaded stud) and they are 70-degree
> units so you would need to drop your oven 10-degrees from the stock HP
> values. For thermal mass attachment you could try thermal epoxy or rig up
> your own preferred attachment method. He also had some commercial 5 MHz
and
> 15 MHz crystal values.
>
> Otherwise they are 5th overtone 10-MHz parallel crystals made by Colorado
> Crystal and are new old stock. I think they may work for a replacement in
> the 10811. If you want a spec sheet Jason may offer you one or you can
just
> let me know.
>
> Jason was helpful to me and offered advice on my experimental dewar shop
> standard oscillator project.
>
> His email address is jcklkutz at yahoo.com
>
> Bill, K8CU
> www.realhamradio.com
>
> ----- Original Message ----- 
> From: "Rick Karlquist" <richard at karlquist.com>
> To: "Discussion of precise time and frequency measurement"
> <time-nuts at febo.com>
> Cc: "Discussion of precise time and frequency measurement"
> <time-nuts at febo.com>
> Sent: Friday, February 02, 2007 10:04 PM
> Subject: Re: [time-nuts] HP 10811 "salvage"
>
>
> > You need a parallel resonant crystal (~20 pF) at 10 MHz.
> > If you get a series resonant one, it will be high in frequency
> > in the 10811.
> >
> > Rick Karlquist N6RK
> >
> >
> >
> >
> > Scott Newell wrote:
> > > At 03:45 PM 2/2/2007 -0500, Mark Amos wrote:
> > >>
> > >>Now I know that it won't be as stable as the original fancy SC-cut
> > >> crystal
> > > from HP, but it might be stable
> > >>enough to use as a non-critical bench oscillator for experimenting,
etc.
> > > I'll keep it running for a while
> > >
> > > Hey, you might bug Chuck Wenzel.  He *gave* me an SC cut rock once,
> > > just for fun.  (I think he said it failed his phase noise specs, so he
> > > couldn't
> > > use it.)  At least the turnover temp would be a better fit than a room
> > > temp
> > > AT
> > > cut rock...
> > >
> > >
> > > --
> > > newell  N5TNL
> > >
> > >
> > > _______________________________________________
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> > > time-nuts at febo.com
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> > >
> > >
> >
> >
> >
> > _______________________________________________
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>
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