Hi > On Dec 8, 2014, at 10:35 PM, Brooke Clarke <bro...@pacific.net> wrote: > > Hi Rich: > > Did you use the 723 or . . . .? > As far as I know the 723 is supposed to have low noise.
There are more modern parts with lower close in noise. Linear Technology has a number of them. Your filter caps take out the broadband stuff, close in is all that really matters. Bob > > Mail_Attachment -- > Have Fun, > > Brooke Clarke > http://www.PRC68.com > http://www.end2partygovernment.com/2012Issues.html > http://www.prc68.com/I/DietNutrition.html > Richard (Rick) Karlquist wrote: >> >> >> On 12/8/2014 4:53 PM, Bert Kehren via time-nuts wrote: >>> We solved that problem by attaching the regulators to the FRK back plate >>> which is with fan control is kept within 0.01C. We did not do it for that >>> purpose but found that we needed some more heat in order to keep the fan in >>> an >>> optimum fan speed. Rb, OCXO and Fan power transistor are on the back >>> plate. Works for us. >>> Bert Kehren >>> >> >> When I designed the E1938A, I chose a reasonable looking voltage >> reference IC and put it inside the oven. I figured that was >> the end of it as far as tempco was concerned. It was, but it >> turned out that the *noise* of the reference was unacceptable >> and of course the oven does nothing to fix that. I had to >> switch to a lower noise reference. >> >> Rick Karlquist N6RK >> _______________________________________________ >> 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. >> > > _______________________________________________ > 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. _______________________________________________ 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.