[Elecraft] Re: MFJ259

[Vic K2VCO]

Don Wilhelm wrote:
> Jack,
> 
> Yes, connecting a measureing instrument directly to an antenna can be
> troublesome if there are strong broadcast stations in the area or other
> sources of signals that can fool the instrument.
> 
> Zack Lau addressed that situation in a Technical Correspondence article in
> QST a while ago - his answer was to measure the antenna indirectly with an L
> network - the L network provides selectivity - adjust the L network to
> provide a 50 ohm match, then remove it from the antenna, terminate what was
> the measurement side with 50 ohms and measure the side previously connected
> to the antenna.
> 
> Sounds like a sane way to approach it to me.

I'm not sure of the reasoning, but he also said that if you do this, you 
need to reverse the sign of the reactance that you get when you measure 
the network.
-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco