We do this with Motorola gear that is synchronized. Unsynched gear may not work well as the isolation between polarizations is not that great. One transmitter will be getting into the other receiver. It may be 20 dB down, but if it is coming out at +27 dBm it will still be hitting the input of the other unit at +7dBm. That is a powerful amount of interference.
----- Original Message ----- From: "Joe Miller" <[EMAIL PROTECTED]> To: "WISPA General List" <wireless@wispa.org> Sent: Monday, September 29, 2008 5:31 PM Subject: Re: [WISPA] Dual Pol Antennas > Now for the 64 dollar question on dual pol antennas...Can one run 2 > separate links using a Dual Pol Antenna pair. I'm looking at using 2 sets > of Trango Link 45's. I would like to run 1 link Vertical and 1 link > Horizional. using differant freqs of course. Can both of these links use > the same dual pol antennas pair. I want to use one for a backup. > > Best Regards, > > DSLbyAir, LLC > 228-238-2563 > > > --- On Mon, 9/29/08, Tom DeReggi <[EMAIL PROTECTED]> wrote: > >> From: Tom DeReggi <[EMAIL PROTECTED]> >> Subject: Re: [WISPA] Dual Pol Antennas >> To: "WISPA General List" <wireless@wispa.org> >> Date: Monday, September 29, 2008, 2:02 PM >> > They have SNR but not RSSI, which >> >> Does that mean they can't do a spectrum scan to get >> rssi of AP? And need to >> be associated to get a SNR? >> >> Tom DeReggi >> RapidDSL & Wireless, Inc >> IntAirNet- Fixed Wireless Broadband >> >> >> ----- Original Message ----- >> From: "jp" <[EMAIL PROTECTED]> >> To: "WISPA General List" >> <wireless@wispa.org> >> Sent: Monday, September 29, 2008 10:34 AM >> Subject: Re: [WISPA] Dual Pol Antennas >> >> >> > The NS5 two small antennnas in it, one for each >> polarity. They have SNR >> > but not RSSI, which >> > I don't like. They don't currently do WPA2+WDS >> together very well; the >> > firmware is >> > improving quickly and has a lot of room for >> improvement, but is promising. >> > You can't turn >> > radio power down lower than 10dbm, and it's a >> 50/50 chance whether the >> > radio will have an >> > SMA or reverseSMA connector if you want to use an >> external antennas. I'd >> > like to see a >> > few more months of polishing before recommending them. >> We have only used >> > them with MT and >> > nanostation APs. >> > >> > On Sun, Sep 28, 2008 at 01:49:02PM -0500, Tom DeReggi >> wrote: >> >> Just looked up the Arc wireless 5.x DP subscriber >> antenna. Looks like a >> >> pretty awesome option. >> >> 20dbi DP for around $60 + $60 for mount and >> enclosure if desired. Thats >> >> makin' it real. >> >> >> >> Not to switch subjects but... The NanoStation5, >> has two 14dbi Dual pol >> >> antennas inside. A great value, for near range >> residential, for $100. >> >> Any negatives with these units (for their >> purpose)? Do they report full >> >> RF >> >> stats such as SNR and RSSI of the link? >> >> >> >> Have people found that they work well with StarOS >> and Mikrotik APs? (for >> >> their purpose of a single user residential type >> CPE) >> >> >> >> Tom DeReggi >> >> RapidDSL & Wireless, Inc >> >> IntAirNet- Fixed Wireless Broadband >> >> >> >> >> >> ----- Original Message ----- >> >> From: <[EMAIL PROTECTED]> >> >> To: "WISPA General List" >> <wireless@wispa.org> >> >> Sent: Sunday, September 28, 2008 12:52 PM >> >> Subject: Re: [WISPA] Dual Pol Antennas >> >> >> >> >> >> > The MTI 5GHz dual-pol sectors we bought were >> around $600 if I remember >> >> > correctly. >> >> > >> >> >> Interesting. I wasn't saying that it >> isn't hard. >> >> >> >> >> >> Some manufacturers have found easy and >> cost effective ways to make >> >> >> Dual >> >> >> Pol >> >> >> antennas. But I'm guessing there >> could be some intelectual property >> >> >> patent >> >> >> issues, or anyone to do it? >> >> >> >> >> >> But there has to be some savings >> attributed to shared costs such as >> >> >> ... >> >> >> mounts, case, shipping costs, overhead, >> distributor markup, R&D. >> >> >> These >> >> >> things are all a tangable cost that goes >> toward the cost of a single >> >> >> pol >> >> >> antenna, and are not increased when the >> inside of the antenna design >> >> >> gets >> >> >> modified to be DP. I'd be intereted >> in what percentage of a single >> >> >> pol >> >> >> antenna cost is for the above 4 things >> compared to the element itself. >> >> >> >> >> >> Truthfully, we have come a long way with >> DP design and price for >> >> >> parabolics >> >> >> and subscriber panels. >> >> >> >> >> >> What realy confuses me is, why >> manufacturers still can;t come up with >> >> >> a >> >> >> low >> >> >> cost DP AP sector antenna? >> >> >> >> >> >> Its ironic as heck, that trango can sell >> an entire AP radio and int DP >> >> >> sector antenna, for less than third >> parties sell a single DP sector >> >> >> antenna >> >> >> by itself. >> >> >> >> >> >> Thats still the missing peice of the >> puzzle in 5.x Ghz DP. >> >> >> >> >> >> Its Ironic as heck... Titltek can make a >> 4ft 900Mhz dual pol 90deg for >> >> >> under >> >> >> $700. But can't find a < 2ft 5.x >> Ghz Dp 90 for less than a grand. >> >> >> The last few I did, I took my old Trango >> 5800s, drill holes in them >> >> >> for >> >> >> the >> >> >> pigtails, took out the SBC, and used them >> for the antenna. It was >> >> >> cheaper >> >> >> than buying an antenna. >> >> >> >> >> >> A couple vendors have represented that >> they can make them. But I don't >> >> >> see >> >> >> part numbers listed. I'd love to see >> these in the sub $300 range. >> >> >> >> >> >> Tom DeReggi >> >> >> RapidDSL & Wireless, Inc >> >> >> IntAirNet- Fixed Wireless Broadband >> >> >> >> >> >> >> >> >> ----- Original Message ----- >> >> >> From: "Chuck McCown - 3" >> <[EMAIL PROTECTED]> >> >> >> To: "WISPA General List" >> <wireless@wispa.org> >> >> >> Sent: Saturday, September 27, 2008 11:30 >> AM >> >> >> Subject: Re: [WISPA] Dual Pol Antennas >> >> >> >> >> >> >> >> >>>A dual pol panel antenna can be an >> order of magnitude more difficult >> >> >>>to >> >> >>>make >> >> >>> than a single linear polarized >> antenna. Almost all panel antennas >> >> >>> are >> >> >>> either an array of patches or an >> array of butterfly dipole elements >> >> >>> over >> >> >>> a >> >> >>> ground plane. Most designers are >> trying to put as much gain in the >> >> >>> area >> >> >>> as >> >> >>> they can. The means the feed network >> and driven elements are crammed >> >> >>> in >> >> >>> so >> >> >>> close together that you suffer some >> degradation. To make a dual pol >> >> >>> patch >> >> >>> you have to use a square patch. That >> already is less than optimum. >> >> >>> Then >> >> >>> you have to produce a second feed >> mechanism for feeding the second >> >> >>> feed >> >> >>> point on all the patches. That means >> other layers and intermediate >> >> >>> ground >> >> >>> planes etc. Not easy at all. >> >> >>> >> >> >>> ----- Original Message ----- >> >> >>> From: "Tom DeReggi" >> <[EMAIL PROTECTED]> >> >> >>> To: "WISPA General List" >> <wireless@wispa.org> >> >> >>> Sent: Saturday, September 27, 2008 >> 9:49 AM >> >> >>> Subject: Re: [WISPA] Dual Pol >> Antennas >> >> >>> >> >> >>> >> >> >>>> Drew, >> >> >>>> >> >> >>>> Who sells/stocks it? >> >> >>>> >> >> >>>> I also saw someone was selling >> what looked like the MTI Dual pol >> >> >>>> 25dbi >> >> >>>> for >> >> >>>> about $200, I think it was >> wlanparts.com. Thats starting to get >> >> >>>> affordable. >> >> >>>> >> >> >>>> I'm fine with Dual Pol dishes >> for $225, its a lot of metal. Plus >> >> >>>> there >> >> >>>> usually needed for more critical >> links. Also used more often on >> >> >>>> tower >> >> >>>> sites >> >> >>>> where I get charge per antenna. >> >> >>>> However, when a standard panel is >> only $50, it can't be that more >> >> >>>> expensive >> >> >>>> to add a couple more elements for >> the second pol. >> >> >>>> Clearly a lot of markup fat in >> the price model. I think there is a >> >> >>>> huge >> >> >>>> market for the dual pol Panels at >> sub $150, but at $250, a WISP >> >> >>>> really >> >> >>>> has >> >> >>>> to think about whether its worth >> their while, when they can just >> >> >>>> install >> >> >>>> two >> >> >>>> single pol antennas side by side. >> Expecially if isntalled on >> >> >>>> customer >> >> >>>> roofs >> >> >>>> where there aren;t colo fees. I >> see no reasons that the smaller gain >> >> >>>> panels >> >> >>>> couldn't be made and sold for >> sub $125. Don't get me wrong, its >> >> >>>> still >> >> >>>> good >> >> >>>> news to learn of new DP panels >> available as option. Trango also has >> >> >>>> their >> >> >>>> external model, but its about >> $300. >> >> >>>> >> >> >>>> Tom DeReggi >> >> >>>> RapidDSL & Wireless, Inc >> >> >>>> IntAirNet- Fixed Wireless >> Broadband >> >> >>>> >> >> >>>> >> >> >>>> ----- Original Message ----- >> >> >>>> From: "Drew Lentz" >> <[EMAIL PROTECTED]> >> >> >>>> To: "WISPA General >> List" <wireless@wispa.org> >> >> >>>> Sent: Friday, September 26, 2008 >> 6:58 PM >> >> >>>> Subject: Re: [WISPA] Dual Pol >> Antennas >> >> >>>> >> >> >>>> >> >> >>>>>A product I really like for >> dual-pole is the Mars WA56-DP25N. It's >> >> >>>>>a >> >> >>>>> pretty inexpensive panel from >> 4.9 - 5.875 @ 25dBi .. There are 2 >> >> >>>>> versions, 1 is the antenna >> alone, the other is with an enclosure. >> >> >>>>> Its >> >> >>>>> ~ >> >> >>>>> $260. I know its not $150, >> but its not too bad! >> >> >>>>> >> >> >>>>> -d >> >> >>>>> >> >> >>>>> >> >> >>>>> On Sep 25, 2008, at 10:04 PM, >> Mike Brownson wrote: >> >> >>>>> >> >> >>>>>> A broadband dual pol dish >> will work from 5.2 to 5.9Ghz. You'll >> >> >>>>>> get >> >> >>>>>> the same gain on both >> polarities. But there's noting I know of >> >> >>>>>> less >> >> >>>>>> than $150. Usually dual >> pol dishes are used where you may need a >> >> >>>>>> higher quality antenna, >> so all the manufacturers I know of >> >> >>>>>> (RadioWaves, Maxrad, Pac >> Wireless) for dual pol are the higher >> >> >>>>>> grade >> >> >>>>>> varieties. >> >> >>>>>> >> >> >>>>>> Mike >> >> >>>>>> >> >> >>>>>> >> ________________________________ >> >> >>>>>> >> >> >>>>>> From: >> [EMAIL PROTECTED] on behalf of Blair Davis >> >> >>>>>> Sent: Thu 9/25/2008 8:41 >> PM >> >> >>>>>> To: WISPA General List >> >> >>>>>> Subject: [WISPA] Dual Pol >> Antennas >> >> >>>>>> >> >> >>>>>> >> >> >>>>>> All this talk about Dual >> Pol feedhorns has got me curious.... >> >> >>>>>> >> >> >>>>>> I'm looking for a >> dual pol antenna... >> >> >>>>>> >> >> >>>>>> What I need is H-Pol on >> 5.3GHz band with 18db or more of gain and >> >> >>>>>> V- >> >> >>>>>> Pol on 5.8GHz with 15db >> or more of gain. A narrow beam width is a >> >> >>>>>> plus. >> >> >>>>>> >> >> >>>>>> A grid or a dish will be >> fine. I'd like to keep the price down as >> >> >>>>>> if it is over $150 or so, >> it really won't be cost effective. I >> >> >>>>>> can >> >> >>>>>> mount 2 antennas at this >> location if I have to. >> >> >>>>>> >> >> >>>>>> This is for a short link, >> about 2000ft, but it will be at the end >> >> >>>>>> of >> >> >>>>>> about 50ft of LMR-400. >> >> >>>>>> >> >> >>>>>> Thanks for any ideas.... >> >> >>>>>> >> >> >>>>>> Blair >> >> >>>>>> >> >> >>>>>> >> >> >>>>>> This email and any files >> transmitted with it are confidential and >> >> >>>>>> intended solely for the >> use of the individual or entity to whom >> >> >>>>>> they >> >> >>>>>> are addressed. If you >> have received this email in error please >> >> >>>>>> notify the system >> manager. This message contains confidential >> >> >>>>>> information and is >> intended only for the individual named. 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