[Elecraft] K3 HAGC mod pre S/N 211 (Was: K3 noise-blanker)

[Bill W4ZV]

Bill W4ZV wrote:
> 
> my guess is he may have had a pre-S/N 211 K3 (sans hardware AGC mod
> announced publicly on March 27 with the mod implemented in production
> units approximately mid-January).
> 


G4ILO wrote:
> 
> I believe that some K3's later than S/N 211 do not have the HAGC mod. Mine
> is S/N 222. While installing the KPA3 yesterday I checked the area of the
> mod and it looks exactly like the pictures of the unmodded board. The
> resistor that was changed to a LED looks just like all the other
> resistors, the two resistors that are shorted look just like resistors,
> and there is no added resistor linking two points. So unless the changes
> made in production were done in such a way that the board still looks the
> same, I must assume my K3 does not have the mod, and possibly others post
> S/N 211 haven't either.
> 

http://www.elecraft.com/K3/k3_app_notes.htm

"K3 RF Rev A boards with a  leaded resistor added between C196 and C197 have
this change.
All Rev B RF boards have this change."

If you don't have a Rev B board and there is no discrete resistor between
the two points above, you may not have the mod installed.

73,  Bill
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