[Elecraft] KPA500 Heat Expansion Pop

[Gary Hinson]

RR

The amp was totally silent for the first few weeks of its life.  The clicks
only started happening after a mains brown-out here (the mains went down and
back up several times in rapid succession as they tried to clear a fault in
the local grid, I guess).  I wondered if that event might have damaged
something but everything apart from the popper works well.  

I tried reloading the firmware* just in case that had been corrupted, but no
change.

The amp only pops when its warm i.e. in use, so it does seem to be
temperature-related.

73
Gary
ZL2iFB

* By the way, I couldn't locate the KPA500 firmware on the Elecraft website
(maybe I overlooked it but I couldn't see a link), but anyway the KPA
Utility found it for me.

> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net [mailto:elecraft-
> bounces at mailman.qth.net] On Behalf Of Joe Word
> Sent: Friday, 9 December 2011 10:40 a.m.
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] KPA500 Heat Expansion Pop
> 
> Gary,
> 
> That sounds like what I am hearing, thought it was a relay controlling the
fan,
> but as you said, it did not pop when the fan came on/off.
> 
> Joe  N9VX
> 
>
----------------------------------------------------------------------------
------------------
> ---------------
> Mine pops or clicks too.
> 
> In my case, it sounds like a relay switching.  I thought at first it was
something
> sensing the temperature and changing the fan speed, but the pop doesn't
> (often) coincide with a change in fan speed, so I think that's a red
herring.
> 
> Another ZL told me his KPA does the same thing.
> 
> Our amps still work just fine though!
> 
> 73
> Gary  ZL2iFB
> 
> 
> 
> On Thu, Dec 8, 2011 at 12:37 PM, Joe Word <joe.n9vx at gmail.com> wrote:
> > My KPA500 has developed a heat expansion pop. When it heats up and
> > then cools down I get a pop from inside the amp. It does this now
> > every time I make a SSB transmission.
> >
> > Anyone else experience this? If so, any resolution?
> >
> > Joe  N9VX
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