[Elecraft] K3 - Numeric SWR Display

[Joe Subich, W4TV]

>       Alternately, feeding through one or more half-waves of 
> coax will give you good accuracy while letting you get far 
> enough away from the antenna to not affect the measurement.

Only if the feedline has zero loss.  Force 12 are known for 
making their antennas "look better" by specifying the SWR 
through 100 feet of feedline. 



> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jessie 
> Oberreuter
> Sent: Thursday, September 18, 2008 2:42 AM
> To: Bill W5WVO
> Cc: LIST - elecraft; Cranz Nichols
> Subject: Re: [Elecraft] K3 - Numeric SWR Display
> 
> 
> 
> 
> On Wed, 17 Sep 2008, Bill W5WVO wrote:
> 
> > Actually, looking at transmission line SWR at the transmitter is a 
> > poor way to adjust an antenna. To get it right, you need to use a 
> > complex impedance analyzer like the now-ubiquitous MFJ-259B (or 
> > equivalant instrument), and put it as close to the antenna 
> feedpoint 
> > as possible. Adjust as close as you can get for Xc=0, Xl=0, 
> R=50. You 
> > can't do that with an SWR bridge! :-)
> 
>       Alternately, feeding through one or more half-waves of 
> coax will give 
> you good accuracy while letting you get far enough away from 
> the antenna 
> to not affect the measurement.
> 
> 
> 
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