[Elecraft] KX3 Go Box

2014-06-06 Thread Howard Hoyt 

Hi Ken, list,

I've done some pretty serious thermal studies of the KX3 
(http://proaudioeng.com/wp-content/uploads/2014/03/PAE-Kx31-chart1.jpg).  I looked that 
the Go Box concept a while ago and agree; The problem with the idea is that 
the KX3 uses the case back for all it's PA heatsinking.  In the KX3 case design the 
front-half of the clamshell case is almost completely thermally disconnected from the 
case back (only the thumbscrew area is in contact), and cannot remove PA heat by 
conduction.  In the Go Box concept the front panel is the only thing exposed to ambient 
air flow.  If the back part of the case was to be sealed in a closed cavity or encased in 
foam, heat build-up would be inevitable.  The Go Box idea may not kill the KX3's 
performance (drift, thermal limitations) if the KX3 is only used as a receiver or very 
low duty-cycle operation.  Of course, one could put a fan in the box, but here we go 
again, killing the KX3's most hard-won and fantastic attributes: low power consumptio
n, no moving parts and no acoustic noise.

Howie - WA4PSC



How about heat dissipation if the intent is to operate the radio
in the box and encased in foam?

Ken - K0PP
On Jun 6, 2014 5:50 AM, Jeff Herrher...@comcast.net  wrote:




Saw this onhttp://www.amateurradio.com/
http://www.oe2atn.at/tom/gobox/


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Re: [Elecraft] KX3 Go Box

2014-06-06 Thread Anthony Scandurra 
The case is clearly not sealed.  Notice the gaps on all four sides of the
panel insert.  Is it enough?  Maybe...

Of course, the user should keep the entire case in the shade, too.

73, Tony K4QE


On Fri, Jun 6, 2014 at 12:30 PM, Howard Hoyt hh...@mebtel.net wrote:

 Hi Ken, list,

 I've done some pretty serious thermal studies of the KX3 (
 http://proaudioeng.com/wp-content/uploads/2014/03/PAE-Kx31-chart1.jpg).
  I looked that the Go Box concept a while ago and agree; The problem with
 the idea is that the KX3 uses the case back for all it's PA heatsinking.
  In the KX3 case design the front-half of the clamshell case is almost
 completely thermally disconnected from the case back (only the thumbscrew
 area is in contact), and cannot remove PA heat by conduction.  In the Go
 Box concept the front panel is the only thing exposed to ambient air flow.
  If the back part of the case was to be sealed in a closed cavity or
 encased in foam, heat build-up would be inevitable.  The Go Box idea may
 not kill the KX3's performance (drift, thermal limitations) if the KX3 is
 only used as a receiver or very low duty-cycle operation.  Of course, one
 could put a fan in the box, but here we go again, killing the KX3's most
 hard-won and fantastic attributes: low power consumptio
 n, no moving parts and no acoustic noise.

 Howie - WA4PSC


  How about heat dissipation if the intent is to operate the radio
 in the box and encased in foam?

 Ken - K0PP
 On Jun 6, 2014 5:50 AM, Jeff Herrher...@comcast.net  wrote:


  Saw this onhttp://www.amateurradio.com/
 http://www.oe2atn.at/tom/gobox/


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