[ARC5] GF-11/12 frequency lowering

[Dennis Monticelli]

Thanks for the inputs.  Actually, I was referring to the transmitter, not
the receiver.  The transmitter has a much less complicated coil set.  I was
thinking about padding down the VFO tank and the PA tank.  I didn't think
there was enough range in the screw adjustments to swing 5%.  Any thoughts
regarding the transmitter?




On Tue, Aug 23, 2011 at 9:31 AM, <WA5CAB at cs.com> wrote:

> I haven't, and don't recall anyone else ever mentioning it.  But the coils
> are match-marked to a specific serial number receiver.  I don't know, and
> the manuals don't say, whether the tweaking was done in the receivers or the
> coils, but logic says it must have been the coils.  If what you are trying
> to do is to get the frequency to match the tuning chart, I see no real
> "collector" reason not to tweak the coils.  So long as you edit somehow the
> serial number on the coil to match the receiver it now belongs to.  The odds
> of anyone ever again matching the coil up to its original receiver are quite
> small.
>
> I'll add (although I have never looked carefully at the coil sets to prove
> it) that there is probably some way in which to adjust the coils, as well as
> maybe "select on assembly" padder capacitors.
>
>
> In a message dated 08/23/2011 02:46:41 AM Central Daylight Time,
> dennis.monticelli at gmail.com writes:
>
> Has anyone tried capacitively padding a GF-11/12 to bring the freq down
> slightly (about 5%)?   I would like to do it in a gentle way such that the
> caps could be easily unsoldered to restore originality.  Of course another
> way to do this is to locate and acquire a different coil set.
>
> Dennis AE6C
>
>
>
> Robert Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480