[Elecraft] KPA500 troubles

[Guy Olinger K2AV]

Kpa500 on 60 is illegal unless you have a *measured and
documented* VERY lossy antenna that would reduce the effective radiated
power to the same as 100 watts on a dipole. The simple 99 percent answer is
that on 60m SHUT OFF the Kpa500 and run 100 watts barefoot.

73, Guy K2AV

On Thursday, November 12, 2015, W4GRJ <w4grj at satterfield.org> wrote:

> Since I have never operated on 60m ever... You figure it out
> Jack
> W4GRJ
>
> On Nov 11, 2015, at 3:33 PM, Jim Brown-10 [via Elecraft] <
> ml-node+s365791n7610243h47 at n2.nabble.com <javascript:;>> wrote:
>
> On Wed,11/11/2015 12:10 PM, W4GRJ wrote:
> > Got the KPA500 back from Elecraft.
> > Problem found: L22 and other components in the 60M low pass filter
> circuit
> > burnt through the LPF PCB.
>
> 60M LPF??? Last I looked, the US power limit on 60M is 100W relative to
> a half wave dipole.
>
>
>
> > Repair $650 later: Replaced low pass filter module and installed QSK mod.
> >
> > On the phone I asked what caused the failure, answer was no idea other
> than
> > component failure. I understand stuff fails but I thought I would get
> more than 2 years before a major expensive failure.
>
> The LPF is on the output of the amplifier. One possible cause of failure
> could be lightning.
>
> > Previously had a Ameritron ALS-600 for 5+ years never a problem, sold it
> to
> > purchase the KPA500.
> >
> > Sometimes the grass is not greener.
>
> My only experience with an ALS-600 was at a contest station in PJ4
> several years ago. I found it to be a really inferior amp - most of the
> time, I was lucky to get 300W out if it. No comparison to a KPA500.
>
> 73, Jim K9YC
>
>
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