K1 Low Power on 20M band once ATU is installed...

[Elecraft mailing list]

I just built a new K1 and had some problems with the output power. To  make
a long story short I
ended up having to lower the values of R5 and  R11...  This brought the
power levels up on
the 40 M band from 1.5  to 6.5 Watts and on the 20 M band from 0.5 to 5.5
Watts.
 
Figured all was well now until I installed the new ATU....

For some  reason my output power on the 20M band into a 50 Ohm dummy load
is
only  around 0.7 Watts now with the ATU installed.  If I remove it - it  
goes  back up to normal!

Any  ideas?

Thanks,

Michael
n2zdb
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[Don Wilhelm-4]

Michael,

Did you change the jumper next to the BNC jack when you installed the
KAT1?  If you failed to do that, the K1 would show a low power even
though it was actually developing full power output.
Make sure the ATU menu is set to CAL P.

If you are measuring power output with an external wattmeter, then check
the soldering of the KAT1 toroid leads.  You should not see any enamel
on the solder side of the board and you should see a bit of tinned lead
above the board.

73,
Don W3FPR

On 2/13/2016 11:11 PM, Michael via Elecraft wrote:

> I just built a new K1 and had some problems with the output power. To  make
> a long story short I
> ended up having to lower the values of R5 and  R11...  This brought the
> power levels up on
> the 40 M band from 1.5  to 6.5 Watts and on the 20 M band from 0.5 to 5.5
> Watts.
>  
> Figured all was well now until I installed the new ATU....
>
> For some  reason my output power on the 20M band into a 50 Ohm dummy load
> is
> only  around 0.7 Watts now with the ATU installed.  If I remove it - it
> goes  back up to normal!
>
> Any  ideas?
>
> Thanks,
>
> Michael
> n2zdb
> ______________________________________________________________
> 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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