[Elecraft] [K3] SWR - Numerical Indication

[Dick Dickinson]

Hi Andy,

 

Thanks for sharing your thoughts.

 

Do you find a high degree of correlation between your (assumed) K3 and
KAT500 SWR readings across various levels of SWR?  

 

 

Kindly,

Dick - KA5KKT 

ANDY DURBIN
<mailto:elecraft%40mailman.qth.net?Subject=Re%3A%20%5BElecraft%5D%20%5BK3%5D
%20SWR%20-%20Numerical%20Indication&In-Reply-To=%3CMW2PR16MB236246C089BBD96E
AD3432F38CAD0%40MW2PR16MB2362.namprd16.prod.outlook.com%3E> a.durbin at
msn.com 
Sun Dec 2 15:13:21 EST 2018 

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  _____  

"Is this 1.0:1 SWR across the entire 40 meter band curious or remarkable?"

 

I'd guess that it's improbable and likely the result of measurement error.
The reflected voltage will be zero for low or high power if the antenna
system is a perfect match .  However, the (measured) reflected voltage will
also be zero for an imperfectly matched antenna system when there is not
enough power for the reflected voltage to be above the detection threshold
on the measurement device.    The Elecraft SWR meters that I have (KPA500
and KAT500) will indicate SWR 1.0:1 with no forward voltage and also with
some forward voltage and no reflected voltage.   You have to know when to
believe the reading and that may be only when the reading is not 1.0:1.

 

Running the sweep with higher power may give quite different results, but
running high power antenna sweeps may be considered anti-social.    An
antenna analyzer will probably give a much better indication of your antenna
system characteristics.

 

Andy, k3wyc

 

  _____