[Repeater-Builder] Re: Heavy Duty Antenna question....
Doug, Not to take anything from the SCALA antennas, because they can make some pretty impressive antennas, but as indicated, the ultra heavy duty antennas are very spendy. They also make normal antennas that are not designed for extreme conditions. Having said that for 440 MHz I really like these Telewave antennas. Telewave does give a very nice HAM Discount also and these are UPS shippable. These are rugged antennas and will survive some pretty extreme conditions. We do make a simple ice bridge above the loops to help break up a major piece of falling ice to avoid a direct hit on the loops. http://www.telewave.com/pdf/TWDS-7033.pdf Best bang for the buck is the two loop ANT 450D3. I have one of these on our 420 linking hub repeater on a site that is typically snowed in about 6 months each year and it actually will out talk the 444 repeater on a DB Products 8 loop antenna. Another Nice thing is that these are very broad band 406-512 MHZ and you can adjust the loops to provide the best coverage pattern for your site. Joe - WA7JAW --- In Repeater-Builder@yahoogroups.com, batwing411 batwing...@... wrote: Thanks for all the recommendations. Fired an email off to Scala, curious to see what they come back with. I read thru a few Scala datasheets... curious that they do not give wind loading with radial ice... and... just my .02 here... from the pictures in their catalog... those antennas sure don't look very durable to me... keep the recommendations coming - specific models would be quite helpful (especially at 440MHz) doug
RE: [Repeater-Builder] Re: Heavy Duty Antenna question....
Doug, If your antenna is going to be subject to 100+ mph winds, it should be braced at the top, and possibly in the middle as well. Moreover, there's no way that any antenna that is supported only at the bottom will survive extended exposure to high winds and ice buildup. The answer may be to side-mount the antenna on a standoff, with an insulated top brace. If the antenna is constrained from waving in the wind, even a medium-duty antenna will stand up well to blustery winter weather. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of batwing411 Sent: Monday, May 31, 2010 10:32 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Heavy Duty Antenna question Thanks for all the recommendations. Fired an email off to Scala, curious to see what they come back with. I read thru a few Scala datasheets... curious that they do not give wind loading with radial ice... and... just my .02 here... from the pictures in their catalog... those antennas sure don't look very durable to me... keep the recommendations coming - specific models would be quite helpful (especially at 440MHz) doug
Re: [Repeater-Builder] Re: Heavy Duty Antenna question....
And just to follow up on my suggestion, Comprod's site says that they offer a line that will survive 200 MPH, heavy snow/ice. Chuck WB2EDV - Original Message - From: Eric Lemmon wb6...@verizon.net To: Repeater-Builder@yahoogroups.com Sent: Tuesday, June 01, 2010 10:01 PM Subject: RE: [Repeater-Builder] Re: Heavy Duty Antenna question Doug, If your antenna is going to be subject to 100+ mph winds, it should be braced at the top, and possibly in the middle as well. Moreover, there's no way that any antenna that is supported only at the bottom will survive extended exposure to high winds and ice buildup. The answer may be to side-mount the antenna on a standoff, with an insulated top brace. If the antenna is constrained from waving in the wind, even a medium-duty antenna will stand up well to blustery winter weather. 73, Eric Lemmon WB6FLY -Original Message- From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of batwing411 Sent: Monday, May 31, 2010 10:32 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Heavy Duty Antenna question Thanks for all the recommendations. Fired an email off to Scala, curious to see what they come back with. I read thru a few Scala datasheets... curious that they do not give wind loading with radial ice... and... just my .02 here... from the pictures in their catalog... those antennas sure don't look very durable to me... keep the recommendations coming - specific models would be quite helpful (especially at 440MHz) doug Yahoo! Groups Links No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.819 / Virus Database: 271.1.1/2911 - Release Date: 06/01/10 14:25:00
[Repeater-Builder] Re: Heavy Duty Antenna question....
I would look at these Telelwave antennas. We have had very good luck with them on some pretty nasty sites here in Oregon. http://www.telewave.com/pdf/TWDS-7045.pdf 175 MPH wind rating and 150 MPH wind rating with a 1/2 of ice loading. As Fred mentioned Kathrein Scala makes a pretty stout antenna also. I would think either one of these companies could come up with a solution for you that would outlast a fiberglass antenna in your extreme conditions. Good Luck, Joe - WA7JAW _ From: Repeater-Builder@yahoogroups.com [mailto:repeater-buil...@yahoogroups.com] On Behalf Of batwing411 Sent: Monday, May 31, 2010 12:07 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Heavy Duty Antenna question well, i tried to search, but.. alas, sorting thru 1400+ posts just isn't going to work. i need actual use facts on high altitude (11k feet), severe duty antenna selection... i've always been a stationmaster (fiberglass) antenna guy - and never had a problem... but...i've never put an antenna up at this height. i am going to need something good for 150+ MPH winds, ICE, etc. Open to ideas.
[Repeater-Builder] Re: Heavy Duty Antenna question....
Thanks for all the recommendations. Fired an email off to Scala, curious to see what they come back with. I read thru a few Scala datasheets... curious that they do not give wind loading with radial ice... and... just my .02 here... from the pictures in their catalog... those antennas sure don't look very durable to me... keep the recommendations coming - specific models would be quite helpful (especially at 440MHz) doug
