); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY While it is difficult to read the resistor values on that schematic (and as Bruce points out not really relevant as the diodes are reverse biased), it appears that since the varicap is referenced to ground, the 10544A's EFC is always positive. The 10811A goes from -5 to + 5 as the cathode end of the diode is referenced to +6.4 volts. All this time I had thought they were fairly interchangeable. - Mike
Mike B. Feher, N4FS 89 Arnold Blvd. Howell, NJ, 07731 732-886-5960 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Bruce Griffiths Sent: Sunday, October 28, 2007 9:53 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] EFC Input pin impedance for the HP 10544A and10811-6011 ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY xaos wrote: > Hello everyone, > > Does anyone know the input resistance of the EFC pin for the > HP 10544A and 10811-6011 OCXO's? > > I have the spec sheet but it is not listed. > > Can I assume something like 50K? This the the value for Crystek devices. > > -George > > George Look at schematic for 10544A: http://www.leapsecond.com/museum/10544/10544-3.gif As long as the varicap is reverse biased only the dc load on the EFC input is diode leakage. Bruce _______________________________________________ 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.
