07-25-2010, 06:01 PM
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Join Date: Dec 2008
Location: Silicon Valley CA, Storm Lake IA
Originally Posted by 1342
this is more like a reference i have a imax 20 feet off my chimney with two sections of 10 ft
mast and no ground.in the back yard i have a spare maco 5/8 with a hub and 4-10ft ground planes.i was thinking of setting the hub at the bottom by the feedline and i was not sure about whether i should isolate the antenna from the mast or not. thanks for those links booty i already read through all of those and nothing seems quite clear.i found a couple of posts on the net about people who have done this,one guy claimed he modified the bracket on the bottom and put 4 ground planes just under the tuning rings.the other guy with that picture claimed the same only he mounted them at the bottom by the feed like the picture.
I would just mount it on the masting directly below the antenna feedpoint. Otherwise, the IMAX will just use the masting for the ground plane. That is the way I have mine set up - BTW - works fine and has a low SWR to boot...
BASE: Kenwood TS-2000, GAP Titan DX, Diamond X50A, Sirio SY27-4, and IMAX 2000.
MOBILE: Galaxy DX99V w/RF Limited CR-577 mic, Sirio Z-180. Yaesu FT-8800R & Diamond NR-770.