[MRCA] Trimmer Capacitors

[Rob Flory]

I had a similar problem with Navy RBM and RBS receivers.  I was able to fix
the caps by wedging the plates apart and soldering  the shaft.

RF


On Sat, Sep 6, 2014 at 10:58 AM, D. Platt <jeepp at comcast.net> wrote:

>  Folks,
>
> As I mentioned in an earlier article in *Electric Radio*, the ceramic
> trimmer capacitors used in the four "modules" in the BC-348( ) receivers
> are further showing failures.  Note that this does not include the J, N,
> and Q models as they have an entirely different variety of trimmer.  I have
> just completed going over three more BC-348 receivers, one Q model, and two
> R models.  Both R models had capacitor issues with a total of four failed
> capacitors.  In each case, the capacitor was without the retaining collar
> thus allowing the spider to spring back, effectively shorting out the
> capacitor.  Fortunately, I had a few spares was was able to simply (sic)
> remove and replace each defective component.  At this point, though, I'd to
> again admonish all to inspect their affected BC-348 receivers.
>
> As a preventative, one might consider spraying some DeOxit on the front of
> the capacitor, prior to adjustment.  This may relive any corrosion between
> the hex collar and the fixed collar, below.  If one always adjusts the
> capacitor via the screwdriver slot, and not the hex head*, there's not much
> else to do to avoid a failure.
>
> Regards   Jeep - K3HVG
>
> * In most cases, the hex head is recessed and can't be used, anyway.
>
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