[Heath] SB-104A VFO question

[Mark Johnson]

Sandy, my guess is that the rotor of the variable capacitor in the vfo is not grounding. The wiper contacts are dirty. If that is the case, I've never had success, at least long term success, with cleaning the contacts. Using a fairly heavy soldering iron, I carefully solder a piece of copper braid to the rotor of the variable cap and the cap's grounded frame. Just insure the braid is small enough to not interfere and that it neatly winds around the shaft as the cap is turned. That cures it! I do this on all heath VFO/LMO variable caps. 

Mark VE3LU

From: ac1wye at gmail.com
To: Heath at puck.nether.net
Date: Mon, 9 Apr 2012 12:33:52 -0400
Subject: [Heath] SB-104A VFO question



Hello, gang, My ‘104A is running fine, except for one little annoying thing: sometimes when tuning, the sensitivity of the optical encoder in the VFO gets weird (at least I think it’s an optical encoder…) Once in a while, if I try to tune, say, less than a full kHz, the display and the frequency will jump a bunch. For instance, if I try to move just .1kHz, it’ll jump .4 or .5. If I wiggle the VFO knob and try again, it’ll settle down. Loose ground somewhere, maybe? 73, Sandy AC1Y Alexander N. Gerli5805 Newhall RoadDurham, NC 27713-2615919-489-9638 A Scotsmen walks about 900 miles each yearScotsmen drink about 40 gallons of whisky each yearScotsmen get about 25 miles per gallon 
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