|[AMRadio] antenna tuners|
collinsradio at adelphia.net
Fri Apr 21 05:21:37 EDT 2006
Could you please explain, using an MFJ antenna analyzer, what is the meter
showing on the instrument?
I would think that the total system, that is feedline and flat top or
antenna if you prefer, is resonating at the point shown on the meter? Or am
I wrong? In any case, I love that device for checking out the "resonant"
point of the antenna system - note that I did not say just antenna.
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----- Original Message -----
From: "Gary Schafer" <garyschafer at comcast.net>
To: "'Discussion of AM Radio'" <amradio at mailman.qth.net>
Sent: Thursday, April 20, 2006 10:12 PM
Subject: RE: [AMRadio] antenna tuners
> This is another tidbit to keep in mind for those that still may think that
> an antenna has to be resonant to give 1:1 swr.
> A dipole antenna rarely is 50 ohms at resonance. It is very dependent on
> height above ground as to what impedance it presents at the feed point. It
> can range anywhere from below 30 ohms to above 70 ohms.
> So if you cut your antenna so that you have 1:1 swr at the transmitter end
> of the coax, the antenna is probably not tuned to resonance! You have
> detuned the antenna to change its impedance that the coax sees.
> Only rarely does a resonant antenna turn out to be 50 ohms.
> Gary K4FMX
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