[EMAIL PROTECTED] wrote: > 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 :)
And on the opposite front, the TSC-5120 isn't very happy with a square wave input, particularly if harmonics fall within its input range. The symptom is lots of spurs showing up in the phase noise plots. Adding a low pass filter with an appropriate cutoff helps a lot. John _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts