Bob Thanks that is even better. I did not think of that. I can do that by swapping the leads at the board interface and stay away from the Osc. circuit itself. Will try that when I replace the OCXO of my FRK-H with a super 10811. Bert Kehren In a message dated 10/29/2010 8:37:13 A.M. Eastern Daylight Time, [email protected] writes:
Hi If you are going to tear into the unit, lift the 100K (R2) that goes to the 6.4 V reference and bring that out. Ground the existing EFC lead and feed the new one with a (low) positive voltage. Bob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Friday, October 29, 2010 5:00 AM To: [email protected] Subject: [time-nuts] HP 10811 EFC I have in the past reversed the varactor, grounding R2 to get a positive tuning voltage from 1.5 to 12 Volt. Also brought out the 5.7 volt for reference purposes. That way every thing was positive. Is easy to get to. But now I have some very good units and I am worried I may change something and degrade performance. Any comments? Bert Kehren _______________________________________________ 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.
