LMO Instability

[Mark Johnson]

Sounds like the rotor on the LMO variable cap is intermittently making 
contact. I've seen this many times. Once in a while you get lucky and a bit 
of contact cleaner will do it. I use the cleaner and then I solder some 
copper braid directly to the rotor shaft, (just ahead of the variable cap 
frame; use a large HOT soldering iron), and the other end right to ground. 
Use just enough braid to "wind" around the rotor shaft without interfering 
with the rotor's ability to  fully turn. That's a permanent fix for sure!

Mark V Johnson VE3DJU/VE3DDI
----- Original Message ----- 
From: "Goss, Ed" <Ed.Goss at JHUAPL.EDU>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Saturday, December 15, 2007 5:28 PM
Subject: [HEATH-TEMPE] LMO Instability


Hello,
     I know this topic has been discussed before, but now that my SB-401 LMO 
is acting up, I can't find the pertinent e-mails. The 401 has developed a 
very warbly, unstable LMO...very noticeable when spotting. The frequency 
jumps around when trying to zero-beat a signal.  Can someone remind me of 
the fix for this? Thanks!
--Ed--




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