Hi Sounds like that's less than $100 on a home brew basis.
There are several variations you could try. None of them break the bank. All do a quadrature test on a pair of OCXO's. Bob On Aug 20, 2010, at 2:17 PM, "Rick Karlquist" <rich...@karlquist.com> wrote: > Mark J. Blair wrote: >>> oscillator inside a Tbolt then I don't think that a frequency >>> discriminator will be sensitive enough, although I might be wrong. >> >> I got the impression that for "good" OCXOs like the HP 10811 or >> (supposedly) the OCXO in my TBolt, the delay line method wouldn't provide >> enough sensitivity for measuring close-in phase noise. > > Right, the delay line method is a non-starter. > > >> >>> Despite what you said, you might want to consider buying an HP 10811 >>> oscillator or similar which you could use in a phase detector >>> measurement system which is likely to give superior results. >> > > On the 10811 production line, they would use Anzac AMC-123 amplifiers > to drive a +17 dBm mixer, and then amplify the IF output with a low noise > current amplifier like the Linear LT1028. You can easily homebrew > this setup. You will need to have a DC coupled connection to the IF > output to make a narrow PLL that drives the EFC of one of the oscillators. > You can use a PC based audio spectrum analyzer program to look at the > phase noise output. You can break the PLL to get a beat note to calibrate > the system. The AMC-123 can also be homebrewed by reading the > patent, which is listed on the data sheet. No need at all to get > a 3048, etc. > > 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.