drjim
Premium,MVM
join:2000-06-13
Torrance, CA
clubs:
| reply to Axilla
Re: Satellite Users & Antennas
I've got an Arrow I use for portable ops, and they're nicely made. One "dirty little secret" about them is the 70cm elements are about 1/2" too short. They were modeled by several people based on the 'as-shipped' dimensions, and those dimension scale perfectly for elements that are insulated from the boom. Since the elements go *through* the boom, they wind up being too short! I got some threaded 1/4" thick aluminum spacers, and add one under each element before I put it together, and the gain is noticeably improved on 70cm.
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One man's Magic is another man's Engineering. |
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Axilla
Finger, Finger
Premium,Mod
join:2001-03-26
Schofield, WI
clubs: | IS that the jpole or a the yagi you are talking about? |
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drjim
Premium,MVM
join:2000-06-13
Torrance, CA
clubs: | The dual-band Yagi. |
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jlramirez
Premium
join:2004-10-01
Montgomery, IL
clubs:
| reply to drjim
said by drjim  : Since the elements go *through* the boom, they wind up being too short! I got some threaded 1/4" thick aluminum spacers, and add one under each element before I put it together, and the gain is noticeably improved on 70cm. I read about that with them (electrically being part of the boom instead of insulated as per the design they were modeled after). I'll have to try it with my Arrow and see the difference.
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Fiber Optics is the future of high-speed internet access. Stop by the BBR Fiber Optic Forum. |
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