[time-nuts] Bad batch of HP10811's

Jim Palfreyman jim2 at tasmail.com
Sun Jan 14 16:18:29 EST 2007


I bought one that had this problem over a year ago. The seller (John Royer) wasn't interested in helping even though it was supposed to be working. Didn't even answer my emails. I ended up opening it up and found a device on the outer PCB not plugged into both its sockets (I presume this is the thermal fuse others were talking about). I nice gentleman opened his up and sent me a photo so I could see how it plugged in (I didn't know what it was or if polarity was important).

Worked like a dream ever since.

Jim Palfreyman

On Sunday, January 14, 2007 at 02:40:46 PM, Discussion of precise time and frequency measurement wrote:

> Time-nuts,
>  
> Seems like a bad batch of HP10811's was dumped on e-bay over the holidays...  Some (at least 
> 2) won't tune up to 10MHz: one won't adjust above 9,999,530 and the other peaks around 
> 9,999,920 after warming up for a day or so.  It seems to stay on frequency (albeit the wrong 
> one...)
> 
> I did some preliminary checks (internal reference voltages, OK, etc.)  I'm thinking that it 
> must be a bad crystal to be this far off. 
> 
> C'est une cause perdue? (I.e. did I buy a "parts" unit?)
> 
> Mark
>  
> 
> 
> 
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