[Elecraft] [K3] K3: SWR meter adjustment

[N0SA]

Here are the results on three bands:
Each radio or antenna analyzer is connected to the exact same coax, there
are
no added switches or connections, the coax goes straight to the antenna.
              K3       IC-7000      Palstar Antenna analyzer
40M        1.1:1         1.5:1              1.6:1
30M         1.2:1        1.5:1              1.6:1
20M        1.1:1         1.5:1              1.4:1

Sure looks like the K3 is off to me comparedf to the other two 
Larry
N0SA


Ron D'Eau Claire wrote:
> 
> Is that on all bands? 
> 
> How long is the coaxial cable between the K3 and the external meter? 
> 
> Both of those things will have a pronounced effect on the SWR. Even though
> the K3 has found a 1.0:1 match, that says nothing about the SWR on the
> coaxial line. The readings you see on an external SWR meter may vary
> widely
> if the system is not terminated in a 50-ohm non-reactive load. An antenna
> seldom presents a 50 ohm non-reactive load. 
> 
> First put a known good dummy load on the rig. That will keep the SWR on
> the
> coax low. Now compare your external meters with the K3 using a very short
> piece of coax (a few inches) and do the comparison at a fairly low
> frequency
> - 160 or 80 meters - to reduce the effects of any remaining stray
> reactance.
> Check one meter at a time since the SWR meter itself adds a little
> reactance. They should agree fairly well under those conditions. A range
> of
> 0.2 is pretty common (i.e. 1.0:1 and 1.2:1), but I'd start to question the
> meter if one read 1.5:1 and the other 1.0:1 under those conditions. 
> 
> Ron AC7AC
> 
> -----Original Message-----
> I just noticed that the SWR meter readings on my K3 do not match my
> IC-7000
> or my Palstar antenna analyzer. The Icom and the Palstar both read the
> same
> but the K3 reads lower.
> The K3 reads 1.0:1 the others read 1.5:1.
> Is there an adjustment for the K3, or am I just being too critical here?
> Larry
> N0SA
> -- 
> 
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