I'm posting an alert with details on this by end of day today. (Both on
the web page and to the Elecraft list.) We're just finalizing the docs
right now.
This will include the serial number range and instructions on adding the
ground wire to correct it. We only became aware of this late last week
and finalized the correction and docs this week. All new production had
this corrected.
73, Eric
Gary Hembree wrote:
Fred,
The front panel ground patch has fixed all of the problems associated with using biased element microphones that I am aware of. The original three K3s affected were SN 690, 728 and 729. Since then several others have complained about the same problems, although I haven't heard if the patch worked for them.
The symptoms on my K3 were exactly the same as on yours when I used the
Elecraft Proset. Additional problems surfaced when using the Elecraft MH2 hand
mike. All of these abnormalities vanished when I grounded (with one small
wire) the two capacitors that have the missing ground trace on the front panel
board. These are bypass capacitors by the way, not blocking. An official
field repair notice is expected soon from Elecraft.
73
Gary, N7IR
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