Howard W. Ashcraft wrote: >> I have been building a GPSDO around an HP10544A that I purchased on >> eBay. After some teeth-gnashing, I have concluded that the 10544A is >> defective. When attached to a load (it is supposed to be rated into 50 >> ohms) the frequency drops radically, and in fact, the frequency is >> dependent upon load, never a good thing. In addition, the output into a >> high impedance load has strong collateral/noise signals that are >> confusing downstream circuitry. You can get a somewhat dirty sine wave >> if you use a high-pass filter setting on an oscilloscope. I took a look >> on an SA and saw a fair amount of energy bouncing around 1.9 Mhz.
I didn't know what a 10544a was so I googled. Lo and behold! Our own leapsecond dude has a schematic. http://www.leapsecond.com/museum/10544/ --- John De Armond See my website for my current email address http://www.neon-john.com Cleveland, Occupied TN All great things are simple and many can be expressed in single words: Freedom, Justice, Honor, Duty, Mercy, Hope. -Churchill _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
