On 18 July 2011 11:12, WB6BNQ <[email protected]> wrote: > Thinking about it Poul, > > That explains why the preferred "frying pan" is made of cast iron in > deference to > the modern light weight ones they sell these days; better temperature control > across the cooking area. I knew I was saving old used cast iron pans for a > reason. Now I know what I am going to do with them.
OT: They also work well on an induction hob if you ever go that way, whereas a lot of older style, or cheaper, stainless steel have non magnetic bases. Steve > And I agree, people are not thinking about the reason for the heat regarding > the > Rb. Everything in its proper balance. > > Bill....WB6BNQ > > > Poul-Henning Kamp wrote: > >> Cooling Rb's is a much misunderstood discipline. >> >> Most Rb's have a specified "base plate temperature range". >> >> For instance the PRS10 specifies -20..+65°C >> >> Cooling Rb's should happen only through the base-plate. >> >> Cooling other surfaces creates unwanted temperature gradients inside >> the Rb unit. >> >> The colder you run a Rb, the more power it uses to keep important >> bits inside warm. >> >> Running it near the top end of the range wears out the electronics >> in it faster. >> >> No matter what kind of cooling, it is important that it offers >> sufficient cooling capacity for the internal ovens to have a >> margin to work with. >> >> For frequency stability, you should strive to have a constant >> baseplate temperature. >> >> Putting a fan on anything, will generally speed up and amplify the >> effects of any ambient temperature changes. >> >> For optimal frequency stability, you want to do is mount >> your Rb on a huge lump of iron which you can keep at a >> constant temperature around 35-40°C by natural convection. >> >> Iron is better than Cu/brass/Al because it conducts heat slower and >> less eagerly, thus attenuating ambient temperature fluctuations. >> >> -- >> 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. > > > _______________________________________________ > 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. > -- Steve Rooke - ZL3TUV & G8KVD The only reason for time is so that everything doesn't happen at once. - Einstein _______________________________________________ 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.
