[Elecraft] KAT100 Power Calibration Problem

[JeremyJones]

I've taken the watt meter out of the loop, and have the K2 set for 10W. 
Double checked the windings and solder on T1, and it still won't go below
30mV.  I definitely have C31 at the low spot as the voltage climbs on either
side.  I still can't get anywhere the voltage needed at U5 pin 5 for the
power calibration.

Jeremy
VA3ZTF


Don Wilhelm-4 wrote
> Jeremy,
> 
> Tune the capacitor very slowly and use a non-metallic tool.  The null is 
> sharp and deep.
> You must have a good 50 ohm dummy load connected.
> You may want to take your external wattmeter out of line to do the
> nulling.
> The actual voltage will depend on the power level, at 5 watts it should 
> be less than 10 mV, but you should be able to get it below 15 or 20 mV 
> if the power is 10 watts.  If you are using 20 watts or more from the 
> KPA100, then your 30 mV is probably OK.
> 
> Ideally, the voltage should go to zero, but being practical, one may not 
> be able to adjust the capacitor in fine enough increments to achieve 
> that goal.
> 
> 73,
> Don W3FPR
> 
> On 2/28/2014 4:32 PM, JeremyJones wrote:
>> I just reread Dons post, and he says less than 10mV, so I guess I have
>> some
>> trouble shooting to do with that first,
>>
>> Jeremy
>> VA3ZTF
>>
>>
>>
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