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" <[EMAIL PROTECTED]> To: "Discussion of precise time and frequency measurement" <[email protected]> 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 [EMAIL PROTECTED] > > Bill, K8CU > www.realhamradio.com > > ----- Original Message ----- > From: "Rick Karlquist" <[EMAIL PROTECTED]> > To: "Discussion of precise time and frequency measurement" > <[email protected]> > Cc: "Discussion of precise time and frequency measurement" > <[email protected]> > 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 > > > > > > > > > _______________________________________________ > > > time-nuts mailing list > > > [email protected] > > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > > > > > > > > > > > > > _______________________________________________ > > time-nuts mailing list > > [email protected] > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
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