By the way -- Despite the discussion in the article about the voltage regulator, TVB and I have discovered that the Wenzel ULN oscillators are very sensitive to external factors like power supply noise. When I was testing with an aged bench supply that apparently had some dried up electrolytics, the close in noise was degraded by as much as 20 dB from the spec. With a really good power supply, spec was met easily.
John ---- Mike Fahmie said the following on 01/23/2008 07:22 PM: > The Wenzel article mentions that care was taken to minimize power supply > noise and HEATER NOISE. I had never considered the effect of the magnetic > field from the heater winding coupling into the oscillator circuitry. > > Fortunately (aka luckily), I had always wound my heater coils with 2 > conductor thermocouple wire (the constantin conductor is quite resistive) > and brought the return current back through the copper conductor just for > convenience, oblivious to the field cancellation feature! Another example > of being right for the wrong reason! > > -Mike- > WA6ZTY > > > At 07:12 AM 1/23/2008, you wrote: >> Hello All-- >> >> I suppose that most on this list already know all about >> this, but as a newbie to considerations about low noise >> oscillators, I found the Wenzel, Inc article on design >> notes for ultra-low noise oscillators interesting-- >> >> Just in case anyone on the list has not seen it: >> >> http://www.wenzel.com/pdffiles1/pdfs/RFDesign1.pdf >> >> Mike Baker >> ------------------------------- >> >> _______________________________________________ >> 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.