- 1. [TowerTalk] Metal roof (score: 1)
- Author: ChrisB@prism.co.za (Chris Burger)
- Date: Mon, 11 Jun 2001 09:26:35 +0200
- Some anecdotal evidence that could be useful. In 1988, I operated as 3DA0/ZS6BCR. I used a Butternut HF2V on 160, in the middle of a corrugated iron barn roof, perhaps 20 x 40 m in size and peaked. T
- /archives//html/Towertalk/2001-06/msg00204.html (7,370 bytes)
- 2. [TowerTalk] Metal roof (score: 1)
- Author: "Dan Schaaf" <dan-schaaf@att.net>
- Date: Fri, 5 Aug 2011 14:25:04 -0400
- Gee, if the roof is resonant on any band of interest, it might detune your antennas. Or it might make one antenna more directional than it already is. But, a roof mounted vertical would get the added
- /archives//html/Towertalk/2011-08/msg00033.html (7,111 bytes)
- 3. Re: [TowerTalk] Metal roof (score: 1)
- Author: Pete Smith <n4zr@contesting.com>
- Date: Fri, 05 Aug 2011 14:44:11 -0400
- Without any direct experience, other than a trap vertical on a 20 x 40 metal roof made up of 4x8 metal sheets, I'd say a vertical would work fine, but anything else nearby could be adversely affected
- /archives//html/Towertalk/2011-08/msg00034.html (8,133 bytes)
- 4. Re: [TowerTalk] Metal roof (score: 1)
- Author: Jim Lux <jimlux@earthlink.net>
- Date: Fri, 05 Aug 2011 12:40:29 -0700
- But... what about all the harmonic generating diodes from the chicken wire under the stucco, or the woven mesh of a chain link fence. I think the harmonics & diodes thing pops up more in situations w
- /archives//html/Towertalk/2011-08/msg00035.html (7,377 bytes)
- 5. Re: [TowerTalk] Metal roof (score: 1)
- Author: "David Jordan" <wa3gin@comcast.net>
- Date: Fri, 5 Aug 2011 18:13:22 -0400
- Our court house has a copper metal roof (flat). Hustler Vertical antennas require an added $45. shunt coil (16 turns) to couple the low impedance to 52ohm coax. The Hustler vertical trap antennas are
- /archives//html/Towertalk/2011-08/msg00036.html (9,858 bytes)
- 6. [TowerTalk] Metal roof (score: 1)
- Author: "Dan Schaaf" <dan-schaaf@att.net>
- Date: Fri, 5 Aug 2011 18:33:41 -0400
- Yes, Hustler BTV antennas were made for the space cadet who doesn't believe that radials are necessary for a properly efficient vertical antenna. However, if an owner of a BTV goees to the DX Enginee
- /archives//html/Towertalk/2011-08/msg00037.html (7,952 bytes)
- 7. Re: [TowerTalk] Metal roof (score: 1)
- Author: "Jim W7RY" <jimw7ry@gmail.com>
- Date: Fri, 5 Aug 2011 15:34:49 -0700
- Now that is a comparison! Buxcom to DX Engineering. "hahaha" Rolling my eyes... 73 Jim W7RY _______________________________________________ _______________________________________________ TowerTalk m
- /archives//html/Towertalk/2011-08/msg00038.html (11,279 bytes)
- 8. Re: [TowerTalk] Metal roof (score: 1)
- Author: "David Jordan" <wa3gin@comcast.net>
- Date: Fri, 5 Aug 2011 18:39:52 -0400
- HAHA, Hey, he makes a nice OCF at a reasonable price and guess what, he gives 10% discounts to Public Safety ACS groups. Yes, roll your eyes for a few more moments... a ham radio business that provid
- /archives//html/Towertalk/2011-08/msg00039.html (12,304 bytes)
- 9. Re: [TowerTalk] Metal Roof (score: 1)
- Author: Gilbert Kauffmann <k3cc@verizon.net>
- Date: Thu, 11 Jan 2018 11:19:50 -0500
- I live on top of Niles Hill about 2,300 ASL and the winds is unbelievable high... I lost part of my shingle roof twice and the insurance company dropped me..... Now, I have a metal roof, fantastic,
- /archives//html/Towertalk/2018-01/msg00053.html (7,128 bytes)
- 10. Re: [TowerTalk] Metal Roof (score: 1)
- Author: Grant Saviers <grants2@pacbell.net>
- Date: Thu, 11 Jan 2018 09:26:59 -0800
- What does "interferes with the 2 meter repeater" mean? We could get in the ballpark SWR curves to prove an A4S tribander was assembled correctly for FD at about 60' out and 42' up from a 56 x 70 x 14
- /archives//html/Towertalk/2018-01/msg00055.html (9,184 bytes)
- 11. Re: [TowerTalk] Metal Roof (score: 1)
- Author: Gilbert Kauffmann <k3cc@verizon.net>
- Date: Thu, 11 Jan 2018 13:29:29 -0500
- Tnx Grant, My repeater is desensed....Folks from 30 to 40 miles are not heard.... Xmit seems ok but the pattern is off.... The tower is on the East side of the house... the xmit favors the East si
- /archives//html/Towertalk/2018-01/msg00058.html (10,486 bytes)
- 12. Re: [TowerTalk] Metal Roof (score: 1)
- Author: Jim Brown <jim@audiosystemsgroup.com>
- Date: Thu, 11 Jan 2018 10:59:42 -0800
- Hi Skip, The "interference" is probably passive intermod (rectification at one or more joints in that roof) that is generating a spur on the input frequency of the repeater. If this is the cause, th
- /archives//html/Towertalk/2018-01/msg00061.html (8,510 bytes)
- 13. Re: [TowerTalk] Metal Roof (score: 1)
- Author: Kent Olsen <kilo6dko@gmail.com>
- Date: Thu, 11 Jan 2018 11:10:09 -0800
- Jim How would one "bond" a metal roof joint? The joints crimped together all along the joint? Thanks 73 Kent N6WT _______________________________________________ _____________________________________
- /archives//html/Towertalk/2018-01/msg00062.html (8,900 bytes)
- 14. Re: [TowerTalk] Metal Roof (score: 1)
- Author: Jim Brown <jim@audiosystemsgroup.com>
- Date: Thu, 11 Jan 2018 11:19:24 -0800
- Probably something like that, but it's not my expertise -- you'll have to take that up with someone who knows the metal being used and how to properly bond it. I'd start with the roofer, but don't e
- /archives//html/Towertalk/2018-01/msg00063.html (10,077 bytes)
- 15. Re: [TowerTalk] Metal Roof (score: 1)
- Author: GARY HUBER <glhuber@msn.com>
- Date: Thu, 11 Jan 2018 19:29:12 +0000
- I agree with Jim as I ran into the same problem at work. Twelve story office building with a copper roof. Any two meter transmission at that building roof area over two Watts and intermod products wo
- /archives//html/Towertalk/2018-01/msg00064.html (9,361 bytes)
- 16. Re: [TowerTalk] metal roof (score: 1)
- Author: Gilbert Kauffmann <k3cc@verizon.net>
- Date: Thu, 11 Jan 2018 14:54:34 -0500
- Tnx My 2 meter repeater antenna is 40 ft above the metal roof and attached to the East side wall of the house.... It seems that on xmit it favors an Eastern direction as if the signal is reflected.
- /archives//html/Towertalk/2018-01/msg00066.html (8,450 bytes)
- 17. Re: [TowerTalk] Metal Roof (score: 1)
- Author: Grant Saviers <grants2@pacbell.net>
- Date: Thu, 11 Jan 2018 17:31:56 -0800
- For the old style galvanized corrugated panels on my barn and shed I added a stainless SMS about every 2' on the overlapped seam. It was time to paint the rusting panels so a coat of aluminum roof pa
- /archives//html/Towertalk/2018-01/msg00067.html (11,704 bytes)
- 18. Re: [TowerTalk] Metal Roof (score: 1)
- Author: Kevin Kidd <kkbroadcastengineering@gmail.com>
- Date: Thu, 11 Jan 2018 20:59:36 -0600
- In another life far, far away at a Motorola MSS, after having fought the PIM caused by rear seat springs in a sparkling new 1988 Cadillac that were desensing the receiver of a full duplex Motorola Pu
- /archives//html/Towertalk/2018-01/msg00068.html (10,307 bytes)
- 19. Re: [TowerTalk] Metal Roof (score: 1)
- Author: Jim Brown <jim@audiosystemsgroup.com>
- Date: Thu, 11 Jan 2018 20:30:57 -0800
- The pros who have chimed in certainly know this, but I'm emphasizing this point for Gilbert. BECAUSE this is a repeater, suppression of any intermod must be REALLY REALLY good to keep it below the le
- /archives//html/Towertalk/2018-01/msg00069.html (9,527 bytes)
- 20. Re: [TowerTalk] Metal Roof (score: 1)
- Author: "Jeff DePolo" <jd0@broadsci.com>
- Date: Fri, 12 Jan 2018 01:13:40 -0500
- I believe you're speaking of a second-order mix. Third-order mixes tend to be more problematic in a repeater installation as they yield "in-band" mix products. Third-order mix amplitude varies as th
- /archives//html/Towertalk/2018-01/msg00070.html (9,175 bytes)
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