[Elecraft] KXPA100 Thermal Fault

[Russell Conner]

Crazy. Find one from Newegg for far less.
On Jul 20, 2014 5:25 PM, "David Cole" <dave at nk7z.net> wrote:

> Fans are always good...  I saw someone selling a thermostatically
> controlled fan for 70 bucks recently...  Built for whatever you want to
> use it on.  I wish I knew where he got his thermostat from...  I would
> build it myself...  Can't bring myself to spend 70 bucks on a fan.
> --
> Thanks and 73's,
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>
> On Sun, 2014-07-20 at 16:54 -0700, george fritkin via Elecraft wrote:
> > Why not run it at 50 watts and give up the 3db.  Probably will not make
> a difference in number of contacts and your thermal problem should go away.
>  Also what is SWR
> >
> > George, W6GF
> >
> >
> > On Sunday, July 20, 2014 4:23 PM, Bert via Elecraft <
> elecraft at mailman.qth.net> wrote:
> >
> >
> >
> > I used my KX3/KXPA100 in the NAQP RTTY contest this weekend. The KX3 with
> > added-on heat sink worked very well; however, the KXPA100 repeatedly
> faulted
> > with HI TEMPERATURE indicated on the KX3 at full output after prolonged
> > operating (lots of CQ'ing with short pause intervals). PA.X temp
> indicated at
> > failure was around 60C...as it should. Shack temperature was around 70
> > degrees  F
> > Yes, I know all about digital modes and full power stressing amplifiers,
> > etc. What I want to know is how to mitigate this interruption yet run
> full
> > output. To that end, I have a couple ideas: what if I mounted the amp
> > vertically  so the heatsink fins "drew" cooler air through themselves via
> > convection?  Secondly, would a couple muffin fans mounted atop the
> cooling fins do
> > the job?
> > The net of this is that I'd like to enjoy the full benefit of having a
> > high-quality 100-Watt amplifier, regardless of mode or key-down time.
> >
> > Bert N4CW/K1IMI
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