[Hallicrafters] Re: Dipole antenna

[Howard R. Weeks]

Bill,

I agree - all antennas or wire will radiate to some extent.  Their
efficiency as a radiator
depends on their dimensions relative to the frequency they are being used
on.  A tuner
does not change that.  The tuner will cancel out all the reactance in the
antenna as seen by
the transmitter.  But it does not change conditions in the antenna itself.
A happy SWR meter on the transmitter side of a tuner does not mean that the
antenna is working
any differently than it's dimensions dictate.

Howard Weeks
Harlem, GA




----- Original Message -----
From: "Bill Gerhold" <k2wh at optonline.net>
To: "'Howard R. Weeks'" <weeksh at bellsouth.net>;
<hallicrafters at mailman.qth.net>
Sent: Wednesday, February 23, 2005 6:02 PM
Subject: RE: [Hallicrafters] Re: Dipole antenna


That's a pretty strange statement.  An antenna that does not radiate?
Perhaps you meant something else because all antennas radiate and all
antennas will radiate whatever power they accept minus of course I2R losses
in the antenna element(s) itself.

A tuner cancels out reactance in the antenna system and then adjusts the
impedance to something the radio likes ~ 50 ohms.  The radio does not "Know"
the antenna is beyond the tuner.  It just likes the tuner.  Don't' believe
me?  Put an SWR bridge on the output of the tuner and one on the input of
the tuner.  1:1 into the tuner and just about anything on the output of the
tuner.

K2WH

-----Original Message-----
From: hallicrafters-bounces at mailman.qth.net
[mailto:hallicrafters-bounces at mailman.qth.net] On Behalf Of Howard R. Weeks
Sent: Wednesday, February 23, 2005 5:56 PM
To: hallicrafters at mailman.qth.net
Subject: Re: [Hallicrafters] Re: Dipole antenna

Let me add another opinion.

Tuners might permit your transmitter or receiver to "like" the antenna
impedance
a bit better - but they do not help an antenna that does not radiate to
radiate better!

Howard Weeks
Harlem, GA