[Elecraft] [KX3] KX3 and Digital Modea (KM4VX)

[Fred Jensen]

FWIW and don't know how this would work on a KX3 but ...

When I still had my KPA100 on my K2, and was using the K2/100 in RTTY 
contests, I stuck a brushless 12 VDC computer muffin fan to the top of 
the heat sink, blowing down, with a little tab of velcro over the PA's. 
  I have a digital thermometer with a remote sensor on a very small 
wire, and I tacked it to one of the PA transistors.  I was able to run 
in a contest at 100 W and the PA temp stayed well within limits.  The 
heat sink stayed cool to the touch.

As I said, FWIW.  I finally sold the KPA100 and use my K2 as my field 
rig with the Alex Loop and no digital now.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
- www.cqp.org

On 7/23/2015 1:40 PM, KM4VX wrote:
> I have found that  the use of an inexpensive computer type fan on even low
> power running behind the KX3 works well  in allowing the full use of the
> digital modes, to include WSPR at 5 watts full cycle of 112 seconds. Thank
> you for all the thoughtful inputs. Running WSPR  at 3 watts does not require
> the fan, but at 5 watts the fan is adequate. The radio gets warms, but does
> not overheat. My KX3 came with the latest heat sink from ElecraftI, have not
> performed the temperature compensation mod,  and will not be buying any
> after-market heat sink. 73 Ron KM4VX