[Elecraft] K3 Enhancements and Application Notes Page (CW rise

[Stewart Baker]

Same here. My Serial # 307, didn't have it.

73
Stewart G3RXQ
On Sat, 29 Mar 2008 10:57:38 -0500, Phil & Debbie Salas wrote:
> My K3, Ser. No 308, does NOT have the HAGC mod.  So the SN 211 
guestimate
> appears pretty far off.
>
> Phil - AD5X
>
> "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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