KXPA100 Power Out Issue

[Terry]

I have noticed over the past weeks that my KXPA100 will not put out any more
than 70-80 watts when I am running my KX3 showing 100 watts output.  The
attenuator is not on.  I have two antennas.  One is a 3 element yagi that is
below 1.2:1 on all bands without the tuner, so when I tune, it just tweaks
it.  Still only 80 W out.  My other antenna is a MyAntennas 10-80 EFHW, also
resonant below 1.5:1 on 80 and 40, the primary bands I operate on.  I get 70
watts out on that antenna.  Everything is grounded properly.  This is a
fairly recent issue.

 

I have tried the amp with my KX2 as well, to make sure it is an amp problem
and not a radio problem, and I get the same result of reduced power output.

 

Any thoughts?

 

Thanks,

 

Terry

N7TB

 

 

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[Grant Youngman-2]

Have you done/redone the Power Output Display Calibration?  See Appendix B in the manual.

Grant NQ5T

> On Sep 7, 2020, at 2:35 PM, Terry Brown <[hidden email]> wrote:
>
> I have noticed over the past weeks that my KXPA100 will not put out any more
> than 70-80 watts when I am running my KX3 showing 100 watts output.  The
> attenuator is not on.  I have two antennas.  One is a 3 element yagi that is
> below 1.2:1 on all bands without the tuner, so when I tune, it just tweaks
> it.  Still only 80 W out.  My other antenna is a MyAntennas 10-80 EFHW, also
> resonant below 1.5:1 on 80 and 40, the primary bands I operate on.  I get 70
> watts out on that antenna.  Everything is grounded properly.  This is a
> fairly recent issue.
>
>
>
> I have tried the amp with my KX2 as well, to make sure it is an amp problem
> and not a radio problem, and I get the same result of reduced power output.
>
>
>
> Any thoughts?
>
>
>
> Thanks,
>
>
>
> Terry
>
> N7TB
>
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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[Elecraft mailing list]

Hi,The Operators manual rev A7, says a minimum of 13.8 v to get !00 W output. There have been several posts in the past that if the dc is less than 13.8 results in less than 100 w output from the KXPA100. 73Jim HK7SSS In a message dated 9/7/2020 11:38:19 AM Pacific Standard Time, [hidden email] writes: 
I have noticed over the past weeks that my KXPA100 will not put out any morethan 70-80 watts when I am running my KX3 showing 100 watts output.  Theattenuator is not on.  I have two antennas.  One is a 3 element yagi that isbelow 1.2:1 on all bands without the tuner, so when I tune, it just tweaksit.  Still only 80 W out.  My other antenna is a MyAntennas 10-80 EFHW, alsoresonant below 1.5:1 on 80 and 40, the primary bands I operate on.  I get 70watts out on that antenna.  Everything is grounded properly.  This is afairly recent issue. I have tried the amp with my KX2 as well, to make sure it is an amp problemand not a radio problem, and I get the same result of reduced power output. Any thoughts? Thanks, Terry N7TB______________________________________________________________ 
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