There are many changes from the S-40A to S-40B and later versions.
Its obvious that cost cutting had something to do with it but I think
the B had more modern circuits in several places.
I think it was found that the simpler circuits in the B and S-85
performed as well or better than the earlier ones.
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On 2/10/2025 1:41 PM, Maynard Wright via groups.io wrote:
Yes, it is balanced on Bands 3 and 4 above 5.3 MHz. But the two coils
for the lower bands have no primary windings and terminal A1 connects to
the top of the coil for either Band 1 or 2. When the switch S1A
connects to either 1 or 2, the two primary windings for 3 and 4, as well
as terminal A2, are left floating. My measurements of my S-40B confirm
this.
Note that this is only for the S-40B and S-85 and is completely
different from the S-40A.
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
