[Elecraft] K3s Output on 6M

[Bob McGraw K4TAX]

Have you run a Transmitter Gain Calibration from the K3 Utility 
Application?  If you do, be sure to use a good dummy load connected 
direct to the radio with a known good short coax jumper.

The fact you have 3 different power indicating devices which all 
indicate different power values, I'd say you have a problem with your 
power measuring system, for starters.   Always when measuring power it 
is wise to use a known good 50 ohm dummy load.  And just because the 
label says 50 ohms is no sign it is really 50 ohms. Measure it with an 
ohm meter.   Power meters are voltage sensing circuits and the R value 
affects the voltage.  Thus, as examples, 100 watts into 45 ohms is 67.08 
volts, 100 watts into 50 ohms is 70.71 volts, and 100 watts into 55 ohms 
is 74.16 volts.    Even with a 1:1 SWR most antennas have some reactance 
and power indications will vary, depending on the complex Z.  It is not 
reliable to measure power with a reactive load such as an antenna.

Good luck.

73

Bob, K4TAX



On 7/10/2018 9:18 PM, Gary Smith wrote:
> Thanks Fred,
>
> Guess I have some issues with my K3s then.
> I think it's past warranty at this point.
> I'll break out the K3 and try to get it
> working in place of the K3s, send the K3s
> back for repair and figure how to get WSJT
> going with the K3 while 6 is still open.
>
> 73,
>
> Gary
> KA1J
>
>> My K3S shows 100 watts, my Bird 43 with a 100 watt element shows 105
>> watts, my Daiwa CN-801HP shows 105 watts.   All measurements are made
>> into a known 50 ohm dummy load.
>>
>> 73
>>
>> Bob, K4TAX
>>
>>
>> On 7/10/2018 7:03 PM, Gary Smith wrote:
>>> What is the expected output on 6 meters?
>>>
>>> The K3 shows 110W
>>> The P3 watt meter says 73.1W
>>> The LP-100A says 60.1W
>>>
>>> When I use the internal tuner it never
>>> breaks into the higher power range, it
>>> only outputs at 7 watts tops.
>>>
>>> On all the lower bands it puts out 100
>>> reliably.
>>>
>>> Thanks & 73,
>>>
>>> Gary
>>> KA1J
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