|To:||Steve Katz <firstname.lastname@example.org>|
|Subject:||RE: [BULK] - [TowerTalk] Omni Directional Antenna on Tower|
|From:||Dino Darling <email@example.com>|
|Date:||Thu, 06 Jan 2005 09:04:06 -0800|
Actually, don't EVER use LMR-400 for a duplex operation. There is some
interaction between the braid and the foil shield that causes noise and
harmonics in a duplex operation. Actually, it always does it, but in a
simplex operation, it doesn't cause a problem. The RG-214 has a double
braid and does not have the silver/aluminum interaction and is a good choice.|
If you MUST have more information, I will dig it up for you. I learned this from the experts on the Yahoo Repeater Group...
Also, another trick is to spin the rotor fully clockwise. Bring the coax up to just below the rotor and then wrap it loosely around the rotor in a clockwise rotation 1-turn.this is the tightest this loop would ever get. As the rotor turns counter-clockwise, this single loop will open up (like a rope opens up when you twist it opposite of its natural twist). Its easier on the coax and it doesn't flex as much as the normal way of looping past the rotor.
At 11:47 AM 01/05/2005 -0800, you wrote:
::I'd put the antenna on top and let it rotate. Use 100% shielded, or at least double-shielded flexible cable (LMR400UF/RG-214/U, etc.) for the rotor loop, and hardline below that point. I did this with one of my repeaters for years. Used to crack up the users with "you're kind of weak, but let me swing the Stationmaster around on you..." -WB2WIK/6
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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