[Elecraft] High Current only on 20 Meters

[Adrian]

I get the same on my KX3 on 12m , When using an antenna analyser the 12m 
radiation resistance is lower (much less than 50 ohm),

with more reactance component than  in the other bands, and when the ATU 
corrects the reactance component of the load, the current

tends to be higher (multi-band antenna use with ATU). than the other 
bands with more radiation resistance values.

Do you have an antenna analyser ?

You are just on the edge. adj your power supply to 15v, and all will be 
well.


Adrian ... vk4tux

On 5/3/20 7:24 am, Leroy Buller wrote:
> Bob,
>
> Yes I think you are right but I think the amps Hp and Lp are ok because it
> just happens on 20 mtrs.  I think there is something bad in the LPF or
> ATU.  I betting on the ATU.  But not for sure.  Emailed support
> Lee
>
> On Wed, Mar 4, 2020, 2:11 PM Bob McGraw K4TAX <rmcgraw at blomand.net> wrote:
>
>> I would run a TX gain calibration using the K3 Utility and a 50 ohm dummy
>> load.   Then with an external power meter and dummy load, observe the power
>> output on each band.   Be sure the ATU is bypassed for this measurement.
>>   This would isolate the issue to the PA, ATU or low pass filter which is
>> band dependent.
>>
>> Bob, K4TAX
>>
>>
>> Sent from my iPhone
>>
>>> On Mar 4, 2020, at 12:46 PM, Leroy Buller <lee.buller at gmail.com> wrote:
>>>
>>> I have a K3 that seems to have a problem.  I am getting HI CURRENT
>> warning
>>> only on 20 meters.  The antenna is matched.  80, 40 and 15 do not have
>> the
>>> issue.  The current meter on the power supply does show quite a bit of
>>> current (20+ amps) on 20 meters but when I reduce power it stops giving
>> me
>>> the issue on 20 meters.  When I reduce power on 20 meters, the high
>> current
>>> goes away around 65 watts.
>>>
>>> Anyone have an idea what is going on?  I do appreciated the help
>>>
>>> Lee - K0WA
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