Jeff, You are correct, a J Pole is an end fed dipole on its side. Max gain at the horizon and extinction at 90 degree elevation. The J section is for matching and does not radiate. Gain = 2.1 dBi at the horizon.
Art, KC6UQH
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Jeff Moore Sent: Sunday, May 12, 2013 10:48 AM To: amsat-bb@amsat.org Subject: [amsat-bb] Re: J-Pole Antenna
I wouldn't recommend a J-pole for satellite work unless you expect to only work sats on the horizon. The J-Pole antenna has a low take-off angle and almost NO radiation overhead, an plain 1/4 wave ground plane antenna would work better for the sats.
J-poles are great terrestrial communications antennas, not so much for working overhead satellite passes. An Eggbeater or quadrifiliar antenna would be a better choice.
7 3
Jeff Moore -- KE7ACY
On 5/12/2013 8:00 AM, Werner, HB9BNK wrote
Thank you all for your valuable hints and advices !
I will now build such an antenna and then supply here the results.
73 Werner, HB9BNK
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