[Elecraft] K3S QST Article

[Kevin]

That's harmonics which the FCC regulates to -43 dBc or better, better 
being a bigger number, on 160-10m, and -60dBc for 6 meters and up. That 
number IS regulated.

That is not the same as two tone TX IMD which is specified by Elecraft 
as around -30dB, and NOT regulated by the FCC, because most hams can't 
measure it accurately.


On 10/18/2016 2:53 PM, Wes Stewart wrote:
> What method(s) did you use to verify the accuracy of your dB(c) 
> numbers?  I get a little queasy when I see "-48.5 dBc."
>
> On 10/18/2016 10:51 AM, Jim Brown wrote:
>> On Tue,10/18/2016 3:43 AM, Yngvi (TF3Y) wrote:
>>> How fast does IMD deteriorate with increased power from the K3S or K3?
>>>
>>> What are the IMD figures when running 20-25W driving a linear amp. 
>>> such as
>>> the KPA500?
>>
>> I've looked carefully at this, and so has my neighbor Bob Wolbert, 
>> K6XX, who is an engineer at Elecraft and a serious contester. The 
>> first link shows my measurements, the second is a pdf of the slides 
>> for a talk that K6XX gave to NCCC three years ago. It includes 
>> measured data showing how TX power out and DC voltage affect IMD.  In 
>> my measurements, increased IMD causes CW bandwidth to increase. You 
>> can see that difference by comparing measurements at 30W, 50W, and 100W.
>>
>> http://k9yc.com/P3_Spectrum_Measurements.pdf
>>
>> http://k9yc.com/K6XXAmpTalk.pdf
>>
>> 73, Jim K9YC
>
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-- 
R. Kevin Stover
AC0H
ARRL
FISTS #11993
SKCC #215
NAQCC #3441


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