[time-nuts] Frequency referenced temperature regulator

Bob Camp lists at rtty.us
Mon Nov 8 17:07:21 UTC 2010


Hi

A lot will depend on the internal construction of the SMD crystal. You would
want to avoid evacuated packages. They will indeed respond much faster than
a conventional leaded BAW. 

You may be surprised at just how good the tempco is on your junk box
crystals. For a good thermometer cut you want something above 10 ppm / C. To
get that with an AT bar, you just about have to put it in the dicing saw
backwards. 

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Poul-Henning Kamp
Sent: Monday, November 08, 2010 11:53 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Frequency referenced temperature regulator

In message <79B9C6DD6AC84DD0B38BC8CA0450DF87 at vectron.com>, "Bob Camp"
writes:
>Hi
>
>The nice thing about a SAW is that you can bond it directly to the surface
>being measured. That reduces lag quite a bit. 

You can do the same by using a modern SMD X-tal...

And I don't have ready access to SAW devices, whereas I have tons of
Xtals of all sorts in my junkbox.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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