Topband: New MFJ 259C available

[Carl]

Im waiting for N6LF to add that to his review results.
http://www.antennasbyn6lf.com/files/vna_comparisons.pdf

Carl
KM1H


----- Original Message ----- 
From: "Paul Christensen" <w9ac at arrl.net>
To: <topband at contesting.com>
Sent: Tuesday, March 04, 2014 10:25 AM
Subject: Re: Topband: New MFJ 259C available


>I had a look at the matching Rosenberger calibration standards and for the 
>money, the kit is a bargain.  At first, I was disappointed to see what 
>amounts to only 1% resistive load accuracy.  The displayed image on the 
>website shows a calibration standard that reads about 49.5 ohms.  But, the 
>software automatically compensates for the disparity.  It's possible to use 
>a DMM with 4-wire resistance capabilities to measure the exact DC 
>resistance then enter the value in a table to get excellent operating 
>accuracy, certainly better than 0.1%.  Depending on the accuracy needed, 
>the VNWA software allows for several other important compensating factors.
>
> http://www.hamcom.dk/VNWA/Rosenberger%20Cal%20standards_rev2.pdf
>
> My only concern with the VNWA is in its ability to measure Topband antenna 
> systems where sweeps are required into the AMBC band.  I'm still looking 
> for input from anyone who has made such measurements.
>
> Paul, W9AC
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