michael taylor-3 wrote:
>
>
> I thought it is meant to be read, any K3 _up to_ S/N 211 may need the
> modification. I take it that after that point in time a change was
> made. Or am I just reading things backwards? Similar to how a number
> of modifications were available/needed for early model K2s whereas a
> late model K2 had very few mods / re-work needed.
>
Correct...units prior to ~211 will need it and afterwards will not. If
yours is near 211 (+/-), you may need to check the capacitance of C222 using
a capacitance meter. It should read ~0.1 uF (or ~100 pF) if the mod has
been installed (if not it will read ~1 uF).
I'm guessing on this, and hopefully Eric or Wayne should confirm, but I
would expect that both the HAGC and keying mods were implemented in
production at the same time, since the S/N transition is the same for both
(i.e. ~211). If this is true, you can easily determine if your unit was
modified by looking for a discrete 1.8k resistor installed between C196 and
C197 as shown in the HAGC mod instructions. If that resistor is in place,
it's a good bet that C222 has been replaced as well, but a capacitance meter
will tell for sure.
73, Bill W4ZV
--
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