[Elecraft] K3: SWR Accuracy

[Don Wilhelm]

Ken,

If folks would accept the fact that the typical wattmeter may be in 
error by as much as 20%, such discussions would be "put to bed" more 
quickly.
I can believe that a calibrated LP-100 will be good to 5% or less, but 
the others need to have proof of accuracy before I will budge from my 
skepticism.  Note well that this statement regards the forward power 
indication only - the indicated SWR has many other variables and can be 
in error by more than the stated 20%.  I will say that most all will 
properly indicate a 1.0 SWR when the impedance is 50 ohms non-reactive, 
but at points away from that value, inaccuracies loom large.

73,
Don W3FPR

Kenneth Waites wrote:
> Where there is additional loss in the coax line, the swr will be lower;
> This, in addition to the transformer effect of additional length of coax.
> It sound to me like there is some loss in the external SWR meter that causes the transceiver to see more loss that the external swr meter is seeing.
> I think what you are seeing should be expected.
>  
> Ken K5WK
>   
>