[time-nuts] HP 10811 EFC

Bob Camp lists at rtty.us
Fri Oct 29 12:36:37 UTC 2010


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. 


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of EWKehren at aol.com
Sent: Friday, October 29, 2010 5:00 AM
To: time-nuts at febo.com
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.
now I have some very good units and I am worried I may change something and

degrade performance. Any comments?
Bert Kehren
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