J-Pole antennas are a 1/2 wave element with a 1/4 wavelength matching stub. The Matching stub allows the dipole to be fed from the bottom end without interference from the feed line. Open Line (J), tapped coax, or LC Circuit can be used to match the dipole to a coax at the end, accomplishing the same performance, including the same overhead null one expects from a vertical dipole.
Art, KC6UQH
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Andrew Rich Sent: Saturday, April 16, 2011 11:03 PM To: KF1BUZ Cc: [email protected] Subject: [amsat-bb] Re: ground plane on
http://www.youtube.com/watch?v=L4v9wKMxRHQ&feature=youtube_gdata_player
Sent from my iPhone Andrew Rich
On 17/04/2011, at 15:53, KF1BUZ [email protected] wrote:
A Copper Jpole, has this been tried? Just thinking it might make my getting into the birds better.
Thanks Dan KF1BUZ
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