[Elecraft] K3 SWR Accuracy - reprise

[N8LP]

That's a good question, Paul. I have a medium power, 150 ohm load laying
around that I made up a couple years ago for testing purposes. I just
checked it with my VNA and it has an SWR of 2.92, pure resistive. I did a
quick test with the K3 at 25W, and it measured between 2.4 and 2.7 depending
on band. That's about the same percentage error as the 25 ohm load, but it's
impossible to know if the error is in the same direction. I would think that
you could calculate the direction using the "tuned" L-network values of a
KAT3, but I don't have one installed. 

Larry N8LP



P.B. Christensen wrote:
> 
>> consistently lower than Jack's, ie. 1.6 on most bands with a 2.0 load.
>> Not 
>> a
>> big deal, but as long as you're in there tweaking the code, can you
>> verify
>> that it works with non-KAT3 radios as well?
> 
> I'm curious -- are those who see a smaller indicated VSWR reading on the
> K3 
> meter with a 25-ohm load seeing the same discrepancy with a 100-ohm load? 
> This may partially explain why some owners are seeing varying results
> under 
> a 2:1 VSWR since that ratio can be comprised of those two resistance loads 
> or an infinite set of resistive + reactive conditions -- any of which can 
> form a load impedance of 25 or 100 ohms.
> 
> Paul, W9AC
> 
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