KPA100 final test.

[bdenley]

Don et al:
I am doing the final test on a KPA100 kit that I have assembled.  Every test has been nominal but my W2 peaks out at 20 watts.  I do get 5 watts when set at 5, etc. but for any setting above 20, I just get 20 watts out.  If I go into tune mode for 10 sec or so, the KPA100 transistors do get hot.  Every resistance test, etc. has been perfect, my bias is set at .97 amps.  T-R is set to 8R- HOLD.

Any ideas would be appreciated.

Brian
KB1VBF
Sent from my iPad
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[Michael Eberle]

Have you double checked that the W2 is on the 200 or 2000 watt scale as
opposed to 20 watts?

Mike
KI0HA

On 5/22/2015 6:42 PM, Brian Denley wrote:
> Don et al:
> I am doing the final test on a KPA100 kit that I have assembled.  Every test has been nominal but my W2 peaks out at 20 watts.  I do get 5 watts when set at 5, etc. but for any setting above 20, I just get 20 watts out.  If I go into tune mode for 10 sec or so, the KPA100 transistors do get hot.  Every resistance test, etc. has been perfect, my bias is set at .97 amps.  T-R is set to 8R- HOLD.
>
> Any ideas would be appreciated.
>
> Brian
> KB1VBF
> Sent from my iPad
>

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[Don Wilhelm-4]

Brian,

The KPA100 TUNE automatically limits the power to 20 watts.
Hold TUNE and DISPLAY together and the power output should be what is
set on the power knob.
If you have not yet balanced and calibrated the KPA100 wattmeter, use an
external wattmeter that you can trust and adjust the forward power pot
so the K2 display agrees with the external wattmeter.

73,
Don W3FPR


On 5/22/2015 7:42 PM, Brian Denley wrote:
> Don et al:
> I am doing the final test on a KPA100 kit that I have assembled.  Every test has been nominal but my W2 peaks out at 20 watts.  I do get 5 watts when set at 5, etc. but for any setting above 20, I just get 20 watts out.  If I go into tune mode for 10 sec or so, the KPA100 transistors do get hot.  Every resistance test, etc. has been perfect, my bias is set at .97 amps.  T-R is set to 8R- HOLD.
>
> Any ideas would be appreciated.
>
>

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