[Elecraft] [ELECRAFT] KPA500 NEW OWNER QUESTIONS.......

[Kevin der Kinderen]

And now the voice of caution.

I think the KPA500 with the KAT500 and my Flex are a wonderful combination.
That said, my KPA500 stopped working. It appears, after reviewing the logs,
I hit it with 75 watts and probably blew one of the diodes in the front
end. I can dig up the explanation if needed. It may have been a case where
it took me a while to realize what I was doing. In fact, I can't remember
the event other than it was logged by the KPA500. By the way... just having
that log available is valuable.

I now have the Flex set to 25 watts max out.

73,
Kev K4VD


On Thu, Feb 28, 2019 at 4:22 PM Barry Simpson <vk2bj.au at gmail.com> wrote:

> I have had my KPA500 for around 5 years. I frequently feed through 200w
> from my TS990S.
>
> I have also accidentally abused it many times by putting 100w or more into
> it or using the wrong antenna or some such operator error.
>
> It has always just faulted appropriately and come back up smiling.
>
> It is a tough little cookie !
>
> Barry VK2BJ
>
> Sent from my iPad
>
> > On 1 Mar 2019, at 06:12, Bob McGraw K4TAX <rmcgraw at blomand.net> wrote:
> >
> > Yes, improperly or incorrectly using ALC with any amp or any
> transceiver, for that matter,  can and usually does produce distortion and
> splatter.   Just look at some of the signals on the bands and observe the
> ALC overshoot which exists with many radios.   And it is made worse by the
> addition of an amplifier in line. It isn't pretty!.   Yet it has little
> impact on the on frequency signal as heard and thus the "great signal"
> complements follow. But look at the other factors where you will find "NOT
> so great signal".   These points should be addressed as well.
> >
> > 73
> >
> > Bob, K4TAX
> >
> >
> >> On 2/28/2019 1:04 PM, john at kk9a.com wrote:
> >> I have not used ALC with any amplifier since transceivers switched to
> transistor finals. From what I have read on this list, using ALC improperly
> can cause distortion.  Just be very careful with your drive level. I
> believe that the KPA500 can handle 100 watts in bypass, 200 watts may be
> pushing it. The KPA500 is a very nice amp and it is easy to use with any
> transceiver.
> >>
> >> GL,
> >> John KK9A
> >>
> >>
> >> JIM LAGESON N0UR wrote
> >> _Thu Feb 28 13:07:27 EST 2019_
> >>
> >>
> >> -------------------------
> >>
> >> I have never owned an amp before and recently put together a KPA500. All
> >> seems to be working well, but I have a few questions. I am using with a
> >> IC-7300.
> >>
> >> How important is the ALC cable? I notice it is not included in the Basic
> >> Cabling Diagram in the manual but is discussed later in the manual.
> >>
> >> If I were accidently to run 100 watts into the KPA500 will the PWRIN HI
> >> Hard Fault/STBY protect itself before any damage is done. Would ALC
> protect
> >> me from that?
> >>
> >> Is it standard procedure to keep the KPA500 in line when turned off and
> not
> >> in use? I see you may run up to 200 through the KPA500 in STBY.
> >>
> >> Is there any concerns or settings on radio when running full break in
> on CW?
> >>
> >> Thanks
> >> Jim-N0UR
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