SB-101 frequency drift

[Mark Johnson]

Pete...From my experience, if its  a distinct, but small "jump" in frequency 
when tuning around the band or sitting on one frequency, its a good chance 
the wiper contact on the variable cap in the LMO is dirty and not making 
good contact. Again, from my experience, no amount of cleaning or the use of 
conductive grease (yeech) will resolve it. I go to the trouble of taking the 
LMO out, removing the side covers, and then I solder a good conductive braid 
right to the variable cap rotor to ground. There is enough shaft to allow 
this. You need a good hot soldering iron to do this but it can be easily 
done. Of course, you need enough braid to allow for full rotation of the 
variable cap. I've done this fix on all the SB Series rigs I have, including 
an SB-104 I had. Its  a permanent and solid fix.

Mark V. Johnson VE3DJU/VE3DDI
----- Original Message ----- 
From: "Pete" <aa9nf at YAHOO.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Friday, December 23, 2005 9:26 PM
Subject: [HEATH-TEMPE] SB-101 frequency drift


>I recently had my SB-101 repaired, aligned, and
> calibrated by RTO.  The rig is working really well and
> I've made some really enjoyable contacts on SSB.
>
> I do notice that the frequency drifts a little bit
> back and forth during a QSO, both on receive and
> transmit, even when the rig has been on and warmed up
> for several hours.  Is this normal for this rig?
>
> Pete
> aa9nf
>
>
>
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