Arnold Tibus wrote: > Hi, > HP was using in their 500MHz counter 5345A a noise generator > (zener diode with amplifier on PC board 'A8 PLL Multiplier Noise Generator > board') to modulate via a varactor and a tank circuit the 10 MHz > reference frequency coming from the ocxo 10811A. > "4-126, As the erratic changes in noise affect CR12's capacitance, the > phase of the 10 MHz signal shifts rapidly. The result ia a 500 MHz time base > signal that is phase modulated so rapidly and erratically that it cannot be > harmonically related to any input signal." > Intersting technique, easy to follow. > Is that what was searched, would such a circuit help? > The manual is freely available via the net as .pdf. > Perhaps that board, cannibalized from an old counter, could be used... > I think it is necessary for TIC to get statistically correct intermediate > counts. > > cheers, > Arnold, DK2WT > > Arnold
Circuit is fine for the application it was designed for. However for measurement purposes accurately calibrating the phase noise spectrum it generates poses some interesting challenges. Bruce _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
