[Elecraft] KPA500 clicks and thermal design

[Michael Blake]

My KPA500 clicking has pretty much stopped as well.  The transformer noise has also reduced in amplitude over time (about 3 months).

Michael Blake
k9jri at mac.com

On Apr 21, 2018, at 03:26 PM, Craig Buck <radiok4ia at gmail.com> wrote:

Make sure the transformer is on straight and secured. Mine clicked for a
while but has since stopped.

On Sat, Apr 21, 2018, 1:35 PM ANDY DURBIN <a.durbin at msn.com> wrote:

I find the "clicks" my KPA500 makes as its temperature changes to be quite
distracting. Part of the problem is that I'm chasing a problem where the
KPA500 changes band spuriously and the thermal clicks sound too much like
the relays re-configuring the LPF.


To what extend does the thermal design require conduction between the PA
heat sink and the case metalwork? Would the thermal management be
compromised if very thin mylar strips were placed between the heat sink and
the case side panel , case rear panel, or Z bracket?


Any other proven techniques for eliminating the thermal
expansion/contraction clicks? (I know the manual says this is normal so no
need to tell me that).


73,

Andy k3wyc
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to radiok4ia at gmail.com

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Elecraft at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to k9jri at mac.com