[Elecraft] Vedr: SWR Readings:Differences

[Per-Tore]

Hi,

Martin makes an important point!
The VSWR indicated on the K3 is measured between tuner and PA. The tuner does not influence the VSWR on the feeder.

P-T / LA7NO

> On 3. sep. 2014, at 12:18, Martin Storli - LA8OKA <arcticpeak at yahoo.no> wrote:
> 
> The first thing you need to do is to use the same SWR-meter both at the tower and at you're K3.
> When measurering close to the K3 and if it is a big difference between you're SWR meter and the K3, the K3 is probably indicating the wrong SWR, or the K3 tuner is coupled in making the SWR to be something quite different than it actually is.
> 
> If both SWR-meters show higher SWR in the shack than at you're tower, there is probably something wrong in the last coax run, hook it up to a dummyload and measure SWR. The SWR shall normally be lower in the shack than at you're tower due to the losses in the coax.
> 
> Martin Storli 
> LA8OKA
> Oslo, Norway 
> 
> ARCTICPEAK's Radio pages! 
> http://www.arcticpeak.com/radio.htm
> 
> 
> ________________________________
> Fra: "pastormg2 at verizon.net" <pastormg2 at verizon.net>
> Til: elecraft at mailman.qth.net 
> Sendt: Onsdag, 3. september 2014 2.06
> Emne: [Elecraft] SWR Readings:Differences
> 
> 
> Good Evening,
> This is Mark Griffin, KB3Z and I have some questions regarding the SWR readings I get at my tower versus what I get on my K3. I will give the SWR readings that I got at my tower for a 40 meter rotatable dipole at 55 feet.
> 
> Tower:
> 
> 7000  2.2
> 7025  1.8
> 7050  1.5
> 7075  1.3
> 7100  1.0
> 7125  1.1
> 7150  1.3
> 7175  1.6
> 7200  2.0
> 7225  2.2
> 
> K3 Readings:
> 
> 7000  3.5
> 
> 7025  3.2
> 
> 7050  2.9
> 
> 7075  2.6
> 
> 7100  2.4
> 
> 7125  2.3
> 
> 7150  2.4
> 
> 7175  2.5
> 
> 7200  2.6
> 7225  2.9
> 
> What would cause such a big difference. The cable run from my antenna switch on the tower to my K3 is only an additional 75 feet. I am using RG-213 cable. Is there anyway that I can test the SWR reading that my K3 is giving me?
> 
> Mark Griffin, KB3Z
> 
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