As an aside, how do the Wavecrest machines work? Do they just run the signal into a low-jitter ADC with a high-quality clock and derive all the timing information digitally, or is the box full of low-noise tunable synthesizers, mixers, filters, and the usual stuff?
-- john, KE5FX > > Hi Henk, > > try running your PRS10 from a Pb battery, with nothing else > connected (no > RS232 etc). > > The plot I sent you was from a PRS running from a switching power > supply, > with RS-232 connected to some other stuff. > > Also, try making the sine wave of the PRS10 into a nice, fast edge rate > square-wave with a Fairchild NC7SZ04 driver inverter for example. > The Wavecrest > units don't work as well with sine waves as with square waves. On > the SZ04, put > a 10nF cap in series to the input, and a 1 MEG resistor from > it's input pin > to it's output pin. Feed the chip from a very low noise 5V power source. > Insert a 40-50 Ohm resistor into the output path going to the > coax. Put an > attenuator/AC-coupler into the coax so the Wavecrest doesen't get > overloaded by > the 2.5Vpp DC signal. Result: low noise comparator/buffer :) > _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts