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Re: [RFI] RF Impedance measurement

To: <rfi@contesting.com>, "George Johnson" <w1zt@comcast.net>
Subject: Re: [RFI] RF Impedance measurement
From: "Tom Rauch" <w8ji@contesting.com>
Reply-to: Tom Rauch <w8ji@contesting.com>
Date: Mon, 25 Oct 2004 14:28:12 -0400
List-post: <mailto:rfi@contesting.com>
> I am looking at the MFJ 259B and Autek VA-1.  Both seem
capable and my MFJ
> 259 has been OK for antenna work I have done in the past.
I have had a
> good history with Autek products also.  Any pro and con
experience would be
> appreciated.  Also, any other options would be useful.


IMO, since I have both, the MFJ 259 is better when it is
calibrated correctly.
I know they went for at least a few years calibrating
incorrectly by setting bias at a fixed voltage instead of
for minimum harmonics into a low Z load at lowest typical
battery voltage.

I have calibration details at:

http://www.w8ji.com/mfj-259b_calibration.htm

73 Tom


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