[Elecraft] ID a small board

[Paul Kirley]

The K3 is a QRP rig with a KPA3 100W option.  Without the KPA3, the K3's low-power amplifier becomes its final amplifier instead of being the KPA3's driver.

I have the board you describe in front of me.  Mine is 41 mm by 9mm.  The board is intended to pass the output of the low-power amplifier to the antenna in case the KPA3 is not part of the K3.  It is not used in a K3 that has the KPA3.

The 12V Sense Mod 1N4148 is a mod to the KPA3 and is unrelated to the bypass module.  I installed that mod 12 years ago; your K3S/KPA3(A) probably doesn't need it.

73, Paul W8TM

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N4FN sed:
Recently I purchased a KPOD from a local SK's estate. In a small zip bag
was board with a 4 pin connector on each end. On the back it is printed
"Remove to instal KPA3". In searching the parts list it says the KPA3 is a
12V Sense Mod 1N4148. On the front next to the connectors are marked J67a
and J67B and the component is marked C241.
I am trying to figure out what this module is and how it was used. It came
with the KPod but I am not sure it has any bearing. My radio is a K3s
Many thanks    Neil   N4FN