[time-nuts] HP10811 taxonomy?

[Bob Camp]

Hi

A couple of possibilities:

The 10544 has a bigger lump of quartz (BT is thicker) in it = good for
aging.

The 10544 could have been on power a lot longer = good for aging.

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Richard (Rick) Karlquist
Sent: Thursday, March 11, 2010 10:53 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP10811 taxonomy?

It is entirely possible that a 10544 could have excellent aging and beat
a 10811.  The SC cut doesn't improve aging.  The other "disadvantages"
of the 10544 in terms of electronics also don't affect aging.  The
main advantage of the 10811 is that it is much better from a cold start
in an instrument.  Not something that affects time-nuts users.

Rick Karlquist N6RK

Robert Atkinson wrote:
> Hi Charles,
> See http://www.leapsecond.com/museum/10811a/90027-1.pdf for details of the
10811D/E versions and options. It's been appended to this copy of the A/B
manual http://www.hparchive.com/Manuals/HP-10811AB-Manual.pdf
>  
> Hope this helps.
>  
> Robert G8RPI.
> 
> --- On Thu, 11/3/10, Charles P. Steinmetz <charles_steinmetz at lavabit.com>
wrote:
> 
> 
> From: Charles P. Steinmetz <charles_steinmetz at lavabit.com>
> Subject: [time-nuts] HP10811 taxonomy?
> To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
> Date: Thursday, 11 March, 2010, 4:07
> 
> 
> Has anyone compiled a taxonomy of the apparently numerous variants of
10811 OXOs?  (Distinguishing features, rated performance, used in what
instruments, etc.)
> 
> Also, I found Mark's observation that 10544s may drift less than 10811s
interesting.  I own several 10544As and have experience with perhaps several
dozen others, and think very highly of them, but haven't seen enough 10811s
for a meaningful comparison ("meaningful" being a relative term, when the
sample sizes are as low as dozens).  What have others observed?
> 
> Best regards,
> 
> Charles
> 
> 
> 
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