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Total 11 documents matching your query.

1. [TowerTalk] Rotator loops (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sat, 27 Feb 2010 06:36:49 -0500; I notice that typical ham rotator loops involve an unsupported loop that is perpendicular to the mast, and attached at top and bottom. It seems to me that this means a lot of flexing through 360 degr; /archives//html/Towertalk/2010-02/msg00631.html (9,654 bytes)
2. Re: [TowerTalk] Rotator loops (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Sat, 27 Feb 2010 05:11:17 -0800; I do with with my MonstIR rotator loop and it works great. The comment below was supposted to be in reference to a cable from the ground to the rotor on a frequently lowered crankup. Rick N6RK ______; /archives//html/Towertalk/2010-02/msg00635.html (11,305 bytes)
3. Re: [TowerTalk] Rotator loops (score: 1): Author: "Tony Brock-Fisher" <barockteer@aol.com>; Date: Sat, 27 Feb 2010 08:11:30 -0500; Pete That's what I use at the transition at the flat top of my Rohn 45. Essentially it's a one-turn loop around the mast before being secured to the mast. Out of concern for chafing against the top p; /archives//html/Towertalk/2010-02/msg00636.html (7,544 bytes)
4. Re: [TowerTalk] Rotator loops (score: 1): Author: "Anthony W. DePrato" <wa4jqs@mikrotec.com>; Date: Sat, 27 Feb 2010 08:55:25 -0500; Tony good ideal on the plastic loom. i wrapped my 40 meter beam about 10 years ago and after about 6 yrs started getting a lot of static when i turned the ant. then noticed the SWR would go up and do; /archives//html/Towertalk/2010-02/msg00639.html (8,762 bytes)
5. Re: [TowerTalk] Rotator loops (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Sat, 27 Feb 2010 06:33:57 -0800; I agree.. they also do this to accommodate the big difference in height as the mast extends, so the coax neatly stacks as it comes down. But, ZOMG,(<grin>) adding each loop of coax (if about 4 feet i; /archives//html/Towertalk/2010-02/msg00643.html (9,774 bytes)
6. Re: [TowerTalk] Rotator loops (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sat, 27 Feb 2010 10:07:24 -0500; Having designed and built those trucks for a few years, there are two issues here: 1) mast height is accommodated by the many turns of the "nycoil" which stretches like a slinky as the mast is raise; /archives//html/Towertalk/2010-02/msg00644.html (9,683 bytes)
7. Re: [TowerTalk] Rotator loops (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Sat, 27 Feb 2010 07:37:07 -0800; Interesting.. Do they use a more flexible chunk of feedline at the top? (I suppose, further, that the actual microwave up and downconverter is probably up at the antenna, so loss in the cable is less; /archives//html/Towertalk/2010-02/msg00650.html (9,396 bytes)
8. Re: [TowerTalk] Rotator loops (score: 1): Author: "WA3GIN" <wa3gin@comcast.net>; Date: Sat, 27 Feb 2010 11:22:54 -0500; I've always thought it would be interesting to use a short piece of the nycoil bracketed to the tower just below the top of the tower and pass the antenna coax through the nycoil to reduce the stress; /archives//html/Towertalk/2010-02/msg00656.html (9,821 bytes)
9. Re: [TowerTalk] Rotator loops (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sat, 27 Feb 2010 11:31:06 -0500; I assume that most of those turns, as Jim suggests, are for nesting and extending the telescoping mast on the TV truck. For a ham application, with a maximum of 450 degrees rotation between stops, it; /archives//html/Towertalk/2010-02/msg00657.html (11,088 bytes)
10. Re: [TowerTalk] Rotator loops (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sat, 27 Feb 2010 15:32:43 -0500; Generally not. The feedline tends to be a high quality foam .405" cable for the 2 GHz band. The transmitter (2W) was in the rack below with power amplifier (ca. 10W) mounted at the top. The loss pro; /archives//html/Towertalk/2010-02/msg00673.html (11,313 bytes)
11. Re: [TowerTalk] Rotator loops (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Sat, 27 Feb 2010 15:42:43 -0500; The commercially available nycoils are on the order of 36 inches in diameter when not extended. If one assumes three turns with 8" diameter at maximum clockwise rotation and a clockwise coil, rotati; /archives//html/Towertalk/2010-02/msg00674.html (13,558 bytes)

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