[time-nuts] Morion MV89A position
Poul-Henning Kamp
phk at phk.freebsd.dk
Wed Jan 29 15:54:05 UTC 2014
In message <20140129193210.W9lqik4I at smtp16.mail.yandex.net>, Charles Steinmetz
writes:
>>Your aluminium box will very efficiently transport temperature
>>changes from its full surface to your OCXO.
>
>I don't believe you understand how it works. The air space in the
>enclosure isolates the oscillator from the cast box.
Sorry, I had read it as you had the OCXO in close contact with the
box.
>>A plastic box with lid and filled with dry sand will do much better
>>than your alubox.
>
>I experimented with dry sand and found that its thermal resistance
>increased faster than its thermal capacitance. By the time there was
>sufficient capacitance there was way too much thermal resistance.
I'm not too fond of sand either, but I found it way better than air
for double-oven OCXOs. Keeping the box air-tight (and sand-tight!)
is pretty important though.
--
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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