[Antennas] RE: shortening a dipole

Ron W7MRR [email protected]
Tue, 21 Oct 2003 15:41:08 -0400 (EDT) 

Hi Hart:

   Peter is right on [see Peter, not everyone on here is so negative].

   The best suggestion is to take your loaded 40 meter dipole [coils at each end] and feed it with 450 ohm open wire into a tuner.  This will operate just fine on all bands between your lowest frequency [40 meters] all the way up to 2 meters.  It's cheap, it works well and you have a clean looking multiband antenna.

Ron W7MRR




 --- On Mon 10/20, Peter Veach < [email protected] > wrote:
From: Peter Veach [mailto: [email protected]]
To: [email protected], [email protected]
Date: Mon, 20 Oct 2003 16:43:26 -0500
Subject: Re: [Antennas] RE: shortening a dipole

My understanding is that as a general rule, leaving the loading coils <br>near the ends of the antenna should be more efficient. However the <br>coils will have to be larger (more turns) as you move away from the <br>center and toward the ends. You could also try adding capacity hats on <br>the ends to make it look longer. I'm not sure what your setup looks <br>like, you should use ladder line if possible if you are trying to make <br>an 'all band antenna' out of this thing. Otherwise you will probably be <br>looking at some pretty substantial line losses. If you have to use <br>coax, you might be better off with traps so the match is decent on the <br>various bands. Your milage may vary and others will say that I don't <br>know what I am talking about so....take it for what it is worth.<br><br>73<br>-Pete<br><br><br>-----Original Message-----<br>From: "Hart Engel" <[email protected]><br>To: [email protected]<br>Date: Mon, 20 Oct 2003 17:18:13 -0400<br>Subject: [Antennas] RE: shortening a dipole<br><br>> Here is my current situation:<br>> <br>> At present I have a half wave dipole cut to 40M band which I use as<br>> well on <br>> 20M with a roller inductor antenna tuner.<br>> <br>> Due to the restricted length of the roof I have done the following:<br>> <br>> Each leg of the dipole is cut to 10M, then I took half of each leg<br>> [5M] and <br>> wrapped it around some pvc pipe and mounted that on the end of each<br>> leg and <br>> tied it to a pole on either end of the roof.<br>> <br>> My question is: If I put the coils in the middle of each leg will<br>> that <br>> radiate better than if I leave the coils at the end of each leg? or<br>> does it <br>> not matter in this case?<br>> <br>> As you can tell I have a limited space to stretch a dipole and would<br>> like to <br>> get the best bang for the buck as they say. My rig has only 10, 15,<br>> 20, 40, <br>> 160M on it.<br>> If you have any suggestions about improving my design let me know.<br>> <br>> Hart<br>> <br>> _________________________________________________________________<br>> MSN 8 with e-mail virus protection service: 2 months FREE*  <br>> http://join.msn.com/?page=features/virus<br>> <br>> - - - <br>> <br>> Your moderator for this list is:<br>> Larry Wilson KE1HZ [email protected]<br>> _______________________________________________<br>> Antennas mailing list<br>> [email protected]<br>> http://mailman.qth.net/mailman/listinfo/antennas<br><br>- - - <br><br>Your moderator for this list is:<br>Larry Wilson KE1HZ [email protected]<br>_______________________________________________<br>Antennas mailing list<br>[email protected]<br>http://mailman.qth.net/mailman/listinfo/antennas<br>

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