[Elecraft] Adding KPA100 to KAT100-2

[Don Wilhelm]

Tom,

Your connections all seem to be correct.  It should make no difference 
if the DE-9 cable is connected to the KAT100 or the KPA100 - try both.  
If it works plugged into the KAT100 and not plugged to the KPA100, then 
likely one of the miniature inductors in the KPA100 AUX I/O circuits is 
open.

You have 3 things that could be the source of the problem - the base K2, 
the KPA100 and the KAT100.  I suggest you eliminate one of them to 
troubleshoot the problem.  I would suggest that the easiest is to 
eliminate the KPA100 first - proceed as follows:

Remove the internal ribbon cable in the EC2 enclosure from the KAT100 
board (leave the other internal cables in place - place the KPA100 
upside down to the right of the EC2 enclosure), put the AUX I/O cable on 
the KAT100 connector, and run the RF out of the base K2 to the RF IN 
jack of the KAT100 - then try the base K2 and the KAT100 (without the 
KPA100).  Resolve any problems with that setup first, then add the 
KPA100 to the mix only after the KAT100 and the base K2 are working 
properly together.  If you have problems only after adding the KPA100, 
you have something open between the KPA100 AUX I/O connector and the end 
of the ribbon cable.

73,
Don W3FPR

Tom Z wrote:
> I am finally getting around to moving my KPA100 from the K2 case to
> the EC2 enclosure that houses my KAT100 tuner. I must be missing
> something obvious - basic K2 appears to work but never accesses ANT2
> and none of the KAT100 SWR lights work (although the AN1/2 LEDs do
> work, and think they are switching).
>
> Here is what I think are the connections:
> Internal to the EC2:
> AUX connector on KPA100 to AUX header on KAT100 board
> AUX 12V connector on KPA100 to AUX12v connector on KAT100 board
> AUX RF connector on KPA100 to AUX RF connector on KAT100 board
>
> External connections:
> 12V connected to K2 and KPA100 (but not to KAT100)
> AUX/IO connector from K2 to KPA100 AUX/IO connector
> K2 ANT OUT (BNC) to AUX RF (BNC) on KAT100
> KPA100 RF OUT to KAT100 RF IN
> ANT1 and ANT 2 to my antennas
>
> When I try to tune, the KAT100 relays do some clicking, but no SWR
> LEDs illuminate. The first time I tried this, I had the KPA100 ANT
> connector open - so hopefully I did not damage anything (was running
> only 20 w TUNE for a few seconds)
>
> Possible error - do I need to connect the external AUX connector to
> the KAT100 connector, instead of the KPA100 connecotr?
>
> Any help appreciated.
>
> 73,
>
> Tom KG3V
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