Don,
I think that idea has merit. I have problems with the idea that the
S-85 is intended to have nothing where C62 is located in the S-40B
because everything else looks the same on the schematics, I think.
I wonder whether accidental omission of C62 would still allow sufficient
stray coupling (think "accidental gimmick") so that the S-85 would
function but not be subject to proper alignment on Bands 1 and 2.
The two halves of L6 need not have the same inductance because an
examination of the switch shows that they are cut in separately on the
two bands and the frequency ranges involved would require different
inductances for resonance.
73,
Maynard
W6PAP
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On 2/13/25 16:38, don Root wrote:
Maynard,? ?for C62 just remove the part no, the Bakelite, and the
voltage, or chop the Cap out, leaving the short leads close together et
voila.. 2 pF.. makes the bean counters happy. ??And frustrates US to no
end.
Now why the apparent high mutual inductance for L6 ? ¡looking at
Emanuele¡¯s pictures. Oh well but some interaction during alignment?
?Back to alignment.
I really hope Emanuele has triple checked that the main tuning dial has
not slipped a bit; he now doubt has, but just in case!
*From:*[email protected]
[mailto:[email protected]] *On Behalf Of *Maynard Wright via
groups.io
*Sent:* Thursday, February 13, 2025 6:32 PM
*To:* [email protected]
*Subject:* Re: [HallicraftersRadios] S-85 refurbish: I've got a problem
during the RF alignment of bands 1 and 2 - trimcaps don't peak!
Hi, Emanuele,
That's an interesting thought about a gimmick capacitor. But the parts
list for the S40B specifies C62 as 2.2mmf, 500 V, bakelite, with a
Hallicrafters part number (47A160-4).
73,
Maynard
W6PAP
--
don??? va3drl
