[Antennas] Antenna Balls

2003年6月24日 00:47:17 -0500

Actually this is no joke. Anything at the top of the vertical will serve as
top loading if it provides additional capacity to ground. A large copper
toilet bowl doesn't do all that much on a full size vertical, but on a
shortened vertical, it probably is worth considering as a means for raising
the driving point impedance.
73/72, George
Amateur Radio W5YR - the Yellow Rose of Texas
Fairview, TX 30 mi NE of Dallas in Collin county EM13QE
"In the 57th year and it just keeps getting better!"
<mailto:[email protected]>
----- Original Message -----
From: "Ron W7MRR" <[email protected]>
To: <[email protected]>; <[email protected]>
Sent: Monday, June 23, 2003 8:00 PM
Subject: RE: [Antennas] Antenna Balls
>> Hi Tim:
>> I was told many years ago that a ball was added to the end of a
vertical antenna to act as a capacity top. There was actually an article in
QST many years ago suggesting the addition of a copper toilet plunger to the
top of a wire vertical because it would draw more RF to the top. Maybe it
was just a little bathroom humor, but it did look more effective.
>> Ron W7MRR
>>>>> --- On Mon 06/23, Tim [email protected] wrote:
> From: Tim [mailto: [email protected]]
> To: antennas@mailman.<input class="txtDsp" type="text" size="8"
name="word6" value=".net
> "
> Date: 2003年6月23日 19:02:58 -0500
> Subject: [Antennas] Antenna Balls
>> Someone asked me today "What is the purpose of the little ball at the end
of<br>a mobile antenna? Someone told me that if I cut it off to tune my
antenna I<br>will ruin the antenna."<br><br>As embarrassing as it is the
only answer I could give was "Well I see no<br>reason why you cannot cut off
the ball to tune the antenna and the only<br>reason I know of that the ball
is there is for static dissipation/control<br>and improve the
antenna<br>efficiency by not ending the antenna in an abrupt point"<br><br>I
have never really questioned it so I really was not prepared to answer the<b
r>question with any authority, but I said I would try to find an
answer.<br><br>You Gurus of the Radiant arts help me out here.<br><br>- - -
<br><br>Your moderator for this list is:<br>Larry Wilson KE1HZ
[email protected]@mailman.<input class="txtDsp" type="text"
size="8" name="word10"
value=".net<br">http://mailman.net/mailman/listinfo/antennas<br>
>> _______________________________________________
> Join Excite! - http://www.excite.com
> The most personalized portal on the Web!
> - - -
>> Your moderator for this list is:
> Larry Wilson KE1HZ [email protected]
> _______________________________________________
> Antennas mailing list
> [email protected]
> http://mailman.qth.net/mailman/listinfo/antennas