In message <[email protected]>, 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 [email protected] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
