In message <[email protected]>, Bruce Griffiths writes: >Hal Murray wrote:
>Thermal wave reflection at boundaries/interfaces does occur: If your frequency or voltage standard is in a physical environment where these effects are relevant, you have much bigger problems to deal with before thermal reflection becomes your number one priority :-) Lets stay real here. Summary: For PLL steered devices, you want your device enclosed by a thermal mass which is again enclosed by a layer of thermal isolation. The goal is to filter/average all rapid (daily ?) external temperature influences, only letting through such slow variations (seasonal ?) which the PLL can comfortably cope with. Even if you use active temperature control, peltier or otherwise, it is still a good idea to employ a thermal mass to cope gracefully with power-failuers and other equipment glitches. Poul-Henning PS: The thermal mass need not be solid blocks of metal, regular ceramic bricks or tiles work fine. -- 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.
