HI In other words the hard part of the task still remains to be done.
Bob On Mar 4, 2010, at 4:45 PM, Bruce Griffiths wrote: > The specifications for the maximum output given on the datasheet are so wide > that the 20% higher than typical beat frequency amplitude may well be within > spec. > The RPD-1's were being over driven by about 2.5dBm or so, which would also > tend to increase the output. > > A test made with 500 ohms to ground as shown in a Minicircuits application > note had about the same output as when terminating the IF port in 50 ohms + > 47nF. > > The remaining questions are: > 1)What effect does the IF port termination have on the phase detector phase > noise spectrum? > > 2) What effect does the IF port termination have on the noise to phase > detector gain ratio? > > Bruce > > Joseph M Gwinn wrote: >> [email protected] wrote on 03/03/2010 10:56:46 PM: >> >> >>> From: >>> >>> Bruce Griffiths<[email protected]> >>> >>> To: >>> >>> Discussion of precise time and frequency measurement >>> >> <[email protected]> >> >>> Date: >>> >>> 03/03/2010 11:03 PM >>> >>> Subject: >>> >>> Re: [time-nuts] DMTD Mixer Terminations >>> >>> Sent by: >>> >>> [email protected] >>> >>> Whilst your corrected measurements for the 10534 and 10514 are now >>> within about 10% of those found by NIST for one of their mixers, the >>> discrepancy with Minicircuits estimates for the RPD-1s is somewhat >>> larger but their phase detector gain specs seem incompatible with their >>> max output specs. >>> >> The diode ring mixers MiniCircuits offers as phase detectors are usually >> designed for and characterized at 500 ohms load, not 50 ohms. Does this >> resolve the discrepancy? >> >> Joe >> >> >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
