[time-nuts] HP 10811 EFC

EWKehren at aol.com EWKehren at aol.com
Fri Oct 29 09:07:19 EDT 2010


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,  
lists at rtty.us 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:  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.
But  
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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