In a message dated 4/24/2007 15:14:11 Pacific Daylight Time, [EMAIL PROTECTED] writes:
>> It is unclear to me if the spurious is normal or not. The spurious of >> my PRS10 is 60dB down the 10MHz so it is strange that you see no >> spurious. >> 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 :) bye, Said ************************************** See what's free at http://www.aol.com. _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
