There is one additional component that Don forgot and that is the
replacement of one of the miniature RFC chokes on the KIO2 with a
toroid equivalent. I have suggested to Elecraft that they revise the
KIO2 to use a toroid at that location to prevent problems with people
(like me) who simply plugged everything into a KAT100-2 without
benefit of any instructions other than the knowledge that it was
easily done. It worked fine for me for two years when a surge on the
KIO2 lines between the K2 and the external KPA100 blew out the
miniature RFC. Four turns through an FT23-43 and a quick solder job
and I was back in business. AFAIK, that is the only "gotcha" to
watch out for with remoting the KPA100. There were even instructions
for building the Y-cable to interconnect the base K2, the KPA100 and
your computer in either the KIO2 or KPA100 manual.
73,
Mike WA3KYY
At 07:09 PM 3/8/2006, Don Wilhelm wrote:
Rob,
I would guess that Elecraft folks are not ready to put up with the headaches
that could arise with the AUXBUS timing should someone want to put a 10 or
15 foot cable on a remote KPA100/KAT100-2 combination. At the moment, those
folks have their hands full and do not have time to test it properly. So if
I were in their shoes, I would not put out instructions for doing anything
that has not been adequately tested - the Elecraft name and reputation do
depend on the results.
That certainly should not limit an individual from trying it, if it doesn't
work, one can always revert to the 'standard' installation. There are a
growing number of us who have mounted the KPA100 externally, and within the
implementation limits of those success stories, we can say what we have
found to work - my connecting cables are about 2 feet long, I can't speak
for anything longer and I don't have the KAT100-2 here, only the external
amp.
In my opinion, the 'kit of parts' to mount the KPA100 externally is in the
box of parts for the KAT100-2 - the KPA100 will plug nicely into the
provided connectors on the KAT100-2 board (except for the KPA100 speaker).
73,
Don W3FPR
> -----Original Message-----
> I am considering increasing the power of my bells and whistles QRP K2
> to 100w. (Seems a long time to the next sunspot maximum and I am
> growing old).
>
> Don and Lyle have given very helpful advice on building the power amp
> and auto tuner into a separate unit and I would like to follow
> this course.
>
> Lyle does of course rightly add "at your risk" headers to his page.
>
> My question is why there is no Elecraft kit of parts and stepwise
> instructions to provide for this requirement - it seems to be an
> obvious component of a modular system which can be used in the shack
> and mobile. A "factory approved" set of instructions and components
> fills a market need.
>
> Rob M0RAC
> K2 3314
>
> Robert A Cochrane
> 7 Lawn Terrace
> Blackheath
> London SE3 9LJ UK
>
> Tel (44) 020 8297 1978
> Mob (44) 07764 197 701
>
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