Subj : Looking into HAMing...
To   : Deuce
From : Frank
Date : Sat Aug 20 2005 01:40 am

  Re: Looking into HAMing...
  By: Deuce to Frank on Fri Aug 19 2005 11:21 pm

 >  > Just wondering if you have ever seen any published radiation patterns
 >  > on this type antenna?

 > I looked like the antenna on our dispatch centre was a professional J-Pole..
 > though possibly it was a pair of whips I suppose.  I'll stop in next week an
 > ask if they have the manual for it laying about.

   Great,

   You can find J-Pole antenna dimension calculators on the web that will
  give you exact build dimensions for the frequency you want to operate on.

   You couldn't consider one for HF because of size but they do great for VHF 
  and UHF. Very easy to build and offer comperable performance to commercial
  verticals (I think).

    On the type I have built (1/2" copper pipe) the biggest problem is making 
  a strong/weather proof connection across the J. This may be an advantage to
  building one like Angus mentioned.

    I honestly think if you build one, especially if you can pick up the 
  materials cheaply you won't be disapointed. There are also plans on the
  web to build these out of 400 hom ladder line. I've never built one of 
  these but I'm told they work well also.

    Good luck. they work.


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