From: Bruce Griffiths <[EMAIL PROTECTED]> Subject: Re: [time-nuts] Double ovened 10811-60158 on ebay Date: Sat, 12 Jul 2008 21:16:41 +1200 Message-ID: <[EMAIL PROTECTED]>
Hej Bruce, > A box with multilayer walls: insulator/metal/insulator/ metal etc does a > much better job of attenuating thermal fluctuations. > The insulator layer only need be significantly poorer at conducting heat > than the metal layer. > Tufnol sheets are OK for the insulator layers, they bond well to > aluminium sheets with epoxy. Well, it was not about doing the perfect box in any sense, but just "casing" an OCXO within a box can have rather noticeable effects on the OCXOs ability to handle temperature changes. The degree of the filter can then be varied at need. > You just need to remove the few watts of heat from the OCXO without too > large an internal temperature rise. Indeed, but the over will not burn as much as it's immediate surrounding is hotter than if it was sitting there alone in the box. Providing a too good insulation is certainly a concern. The trick is really to make the insulation-heatmass-insulation-heatmass stages. Just adding one such stage can be sufficient. Cheers, Magnus _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
