[Elecraft] Part across ant output on KPA100

[Don Wilhelm]

Glenn,

You are reading from the newer KPA100 manual and you have an older 
KPA100 on your hands.

That would be RFC10, and will be found in KPA100s without the more 
recent T/R switch upgrade KPA100UPKIT.
If you look closer, you will find toroids at L15 and L16 wound on red 
toroid cores, and a similarly marked RF Choke at RFC1.

That T/R switch design change was to combat a potential parasitic 
oscillation just above the 40 meter ham band.  I would suggest that you 
install the KPA100UPKIT on that KPA100 while you are working on it.

If it does not have the upgraded shield - with the spring clips, speaker 
shield, narrow opening above the SO-239 jack with 2 soldering lugs that 
connect the shield directly to the SO-239 jack, you should also install 
the KPA100SHLDKIT (or something like that designation).

73,
Don W3FPR

Glenn Biggerstaff wrote:
> Hi ,I am repairing a KPA100 that suffered some lightning damage .I have 
> fixed most of it ,but have a question .The alignment and Installation 
> (page 44 in the manual ) calls for >10 k  from the center pin of the ant 
> connector (J2) and ground. I have that but only with a part that seems 
> to be added from the center pin to ground removed .It is marked 5800 101 
> and I think it is a inductor. It measures a couple of tens of an ohm dc 
> and seems to be about 880 uh .Is it supposed to be there ?I don't see it 
> on the schematic .
> Glenn WW4B
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