Re: [WISPA] 900 antenna question
You hit the nail on the head on the difference Mounting. And then additionally F/B ratio. When it comes to Horizontal 900 120 sectors, options are limited. A 4 ft - 15 wide antenna takes a lot of wind abuse. We use the MTI's occasionally, for low to ground installs. Or where we can mount the antenna to a structure that already has mass to create isolation, like brick penthouses, or when we mount on seperate sides of a hill, and have the dirt help F/B ratios, or when its just a single sector on a thinner pole. But when we go up on a tower, I'd never take a chance with one of the hose clamp mounts, its not worth the liability at 300 feet up. For tower mount, where we do three sectors, I only use Tiltek. They have 20db F/B, which is needed for close mounting, and solid mounting hardware for up to 4.5 pole. For around $530 at Winncomm, its the way to go. However, the mount is over engineered, for a simple low to ground mount. Shims are required to attach to 2 pole. So for low to ground, low risk installs, where its easy for inspection, and antennas don;t need to be right on top of each other, its easier and cheaper to just use the MTIs/Teletronics. Depends on the need. The thing to remember is that F/B ratios are generally MAX isolation, not minimum. So when you are doing 120 sectors, the adjacent sectors overlap a bit. With only 3 sectors in 900, its not possible to skip every other channel like 5.8, so antenna isolation becomes a much bigger deal, and how sharp the cut off on edges. What antenna to use, depends on your isolation characteristics that you are mounting to. This is a tiltek \ _ /with two metal fnages to help isolate and have a tight cut off on edges. Here is the MTI..._ Just the panel itself. Which do you think will work better for isolating from the adjacent sector antenna closely mounted on a tower? Here is where I use MTI/ \or \ I Big fat hill I 50 feet of verticle seperation minimum or Penthouse I __ I / Just my opinion. Tom DeReggi RapidDSL Wireless, Inc IntAirNet- Fixed Wireless Broadband - Original Message - From: Mike Bushard, Jr [EMAIL PROTECTED] To: 'WISPA General List' wireless@wispa.org Sent: Wednesday, November 22, 2006 11:41 PM Subject: RE: [WISPA] 900 antenna question Why don't you just get these? MT-243015/NH - 902-928 MHz 11dBi 180° Horizontal Pol. It's made by MTI, the same brand as the Teltronics. We run MTI 120's for all of our Horizontal towers (17 of these antennas deployed total right now). The mount scared me a little though, it is a Cast V (Same style as the Orthogon Radios) and then you secure it with hose clamps. It seems to work well thought. I think the down tilt gauge is kinda cheesy, so we bought a incli-meter from the local tower crew. Mike Bushard, Jr Wisper Wireless Solutions, LLC 320-256-WISP (9477) 320-256-9478 Fax -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brian Rohrbacher Sent: Wednesday, November 22, 2006 10:24 PM To: WISPA General List Subject: Re: [WISPA] 900 antenna question I don't know but until now the best 180* antenna I can find is the 8dbi from superpass (which I installed today and were crap). This one looks nice. Brian Travis Johnson wrote: Hi, Looks to me like it's about 5db off at 180 degrees. What's the price on this antenna? Travis Microserv Brian Rohrbacher wrote: http://www.teletronics.com/15-404.pdf What would the gain at 180* be on this antenna. I want to make sure I am reading it right. Brian -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] 900 antenna question
Mike Bushard, Jr wrote: Why don’t you just get these? MT-243015/NH - 902-928 MHz 11dBi 180° Horizontal Pol. Who do you buy them from and how much? It's made by MTI, the same brand as the Teltronics. We run MTI 120's for all of our Horizontal towers (17 of these antennas deployed total right now). The mount scared me a little though, it is a Cast V (Same style as the Orthogon Radios) and then you secure it with hose clamps. It seems to work well thought. I think the down tilt gauge is kinda cheesy, so we bought a incli-meter from the local tower crew. Mike Bushard, Jr Wisper Wireless Solutions, LLC 320-256-WISP (9477) 320-256-9478 Fax -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brian Rohrbacher Sent: Wednesday, November 22, 2006 10:24 PM To: WISPA General List Subject: Re: [WISPA] 900 antenna question I don't know but until now the best 180* antenna I can find is the 8dbi from superpass (which I installed today and were crap). This one looks nice. Brian Travis Johnson wrote: Hi, Looks to me like it's about 5db off at 180 degrees. What's the price on this antenna? Travis Microserv Brian Rohrbacher wrote: http://www.teletronics.com/15-404.pdf What would the gain at 180* be on this antenna. I want to make sure I am reading it right. Brian -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
RE: [WISPA] 900 antenna question
I personally dont run 180's, so I dont know. I think we get our 120's for about 700. We get ours from CTI. Mike Bushard, Jr Wisper Wireless Solutions, LLC 320-256-WISP (9477) 320-256-9478 Fax -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brian Rohrbacher Sent: Friday, November 24, 2006 11:16 AM To: WISPA General List Subject: Re: [WISPA] 900 antenna question Mike Bushard, Jr wrote: Why dont you just get these? MT-243015/NH - 902-928 MHz 11dBi 180° Horizontal Pol. Who do you buy them from and how much? It's made by MTI, the same brand as the Teltronics. We run MTI 120's for all of our Horizontal towers (17 of these antennas deployed total right now). The mount scared me a little though, it is a Cast V (Same style as the Orthogon Radios) and then you secure it with hose clamps. It seems to work well thought. I think the down tilt gauge is kinda cheesy, so we bought a incli-meter from the local tower crew. Mike Bushard, Jr Wisper Wireless Solutions, LLC 320-256-WISP (9477) 320-256-9478 Fax -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brian Rohrbacher Sent: Wednesday, November 22, 2006 10:24 PM To: WISPA General List Subject: Re: [WISPA] 900 antenna question I don't know but until now the best 180* antenna I can find is the 8dbi from superpass (which I installed today and were crap). This one looks nice. Brian Travis Johnson wrote: Hi, Looks to me like it's about 5db off at 180 degrees. What's the price on this antenna? Travis Microserv Brian Rohrbacher wrote: http://www.teletronics.com/15-404.pdf What would the gain at 180* be on this antenna. I want to make sure I am reading it right. Brian -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
RE: [WISPA] 900 antenna question
You can't really tell because they have not put a scale on the rings in the diagram. There are multiple ways to measure this and report the data. Some programs will report the strongest point on the pattern as zero db and reference the rest of the points in the pattern as negative db which would be below the strongest point. In that way it is a relative measurement to the highest gain. Some programs will report the points in the pattern as the actual gain at that point and that could be is dbi or dbd. It is important to know which they are using. I have seen 900 MHz antennas referenced either way. Looking at this diagram and just scaling it myself this looks to be about 8.12 dbi at the 180 mark in the pattern. Thank You, Brian Webster www.wirelessmapping.com http://www.wirelessmapping.com -Original Message- From: Brian Rohrbacher [mailto:[EMAIL PROTECTED] Sent: Wednesday, November 22, 2006 12:41 PM To: Conversations over a new WISP Trade Organization Subject: [WISPA] 900 antenna question http://www.teletronics.com/15-404.pdf What would the gain at 180* be on this antenna. I want to make sure I am reading it right. Brian -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] 900 antenna question
Hi, Looks to me like it's about 5db off at 180 degrees. What's the price on this antenna? Travis Microserv Brian Rohrbacher wrote: http://www.teletronics.com/15-404.pdf What would the gain at 180* be on this antenna. I want to make sure I am reading it right. Brian -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
Re: [WISPA] 900 antenna question
I don't know but until now the best 180* antenna I can find is the 8dbi from superpass (which I installed today and were crap). This one looks nice. Brian Travis Johnson wrote: Hi, Looks to me like it's about 5db off at 180 degrees. What's the price on this antenna? Travis Microserv Brian Rohrbacher wrote: http://www.teletronics.com/15-404.pdf What would the gain at 180* be on this antenna. I want to make sure I am reading it right. Brian -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
RE: [WISPA] 900 antenna question
Why dont you just get these? MT-243015/NH - 902-928 MHz 11dBi 180° Horizontal Pol. It's made by MTI, the same brand as the Teltronics. We run MTI 120's for all of our Horizontal towers (17 of these antennas deployed total right now). The mount scared me a little though, it is a Cast V (Same style as the Orthogon Radios) and then you secure it with hose clamps. It seems to work well thought. I think the down tilt gauge is kinda cheesy, so we bought a incli-meter from the local tower crew. Mike Bushard, Jr Wisper Wireless Solutions, LLC 320-256-WISP (9477) 320-256-9478 Fax -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brian Rohrbacher Sent: Wednesday, November 22, 2006 10:24 PM To: WISPA General List Subject: Re: [WISPA] 900 antenna question I don't know but until now the best 180* antenna I can find is the 8dbi from superpass (which I installed today and were crap). This one looks nice. Brian Travis Johnson wrote: Hi, Looks to me like it's about 5db off at 180 degrees. What's the price on this antenna? Travis Microserv Brian Rohrbacher wrote: http://www.teletronics.com/15-404.pdf What would the gain at 180* be on this antenna. I want to make sure I am reading it right. Brian -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/ -- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
