Moto300/Orthogons can do dual payload so you need both polarities to achieve 300 megs.
DSJ -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tom DeReggi Sent: Friday, January 27, 2006 3:52 PM To: WISPA General List Subject: Re: [WISPA] Multiple Radios on Single antenna > What are the advantages of using > both polarities for the same signal in a good LOS environment? There isn't. But having one on standby means, that when someone deploys on that channel/pol, in seconds you can switch polarities, to get past it. Broadcasting on DualPols, does have benefits in NLOS environments. However, the antenna design is more critical for transmitting on both at the same time. Often the Dual Pol antenna is used to create Circular polarity, such as the higher end Proxim Dual Pol gear. Or Orthogon that may compare signals to self correct them. Tom DeReggi > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > On Behalf Of Tom DeReggi > Sent: 17 January 2006 18:08 > To: WISPA General List > Subject: Re: [WISPA] Multiple Radios on Single antenna > > I'm not saying there isn;t a benefit now and then sharing a Dual pol > antenna > > between two freqs, otherwise nobody would make them. BUt.... > > We have found most tower agreements also, have restrictions in the > agreement > > that disallow using multiple radios our spectrum ranges on the > antennas without paying for that as a second antenna, even though > taking up only one antenna position. > > We found that its just as easy to sneak/put up a second antenna, > without managers knowledge as it is to put up a dual freq antenna > without them knowing. So normally you gotta pay regardless, if you do > it honestly. It becomes an issue of wether you are honest about what you put up, versus > sneaking up extra options without paying. Wether its spectrum or > antennas > is irrelevant. Most tower owners don't audit their sides regularly > because its jsut to expensive and even if they do, the auditors often > are over worked, and don't always check thouroughly what they are > required to supposed to check. Most colocators also aren't short on > antenna space, so they are really charging you based on the value you > are receiving being there, not really the actually antenna space. > Although special cases do apply such as with windload requirement of > over weighted towers or towers like clock tower that have a limited > number of window openings for the antennas. > > I also find saving money isn't that much of a savings because the > antenna makers then also charge more for the dual pol antennas to > counter most of your planned savings. > > However, saving on time, clearly is an option, with only one antenna > to carry and bolt up. However you may run into issues, where the > alignment of the antennas may need to be varied to get optimal signal > based on wether you > > are aligning for 5.8 or 2.4. So because we like to engineer for > OPTIMAL signal, apposed to compromised mostly best signal, we prefer > to use seperate > > antennas. > > As a disclaimer: We pay for all our colocated antennas at our cell > sites, and we do that because we honor our tower relationships, and > have negotiated > > good terms, and do not want to abuse the trust they have in us, so we > maintain good relations. I mention sneaking up antennas only because, > every > > once in a while, we may have sneaked up an antenna to do the inital > testing (which often requires it left there for a few days), so that > we can avoid the lengthly antenna request process and timely paper > work until after we are certain that the link is doable and tested. > We justify sneaking the antenna up, because not only are we saving us > time, we also are saving the management a lot of time, preventing the > need to do paperwork unnecessarilly, if we are unsuccessful in pulling > off the link we > engineered. I do not advise attempting to pull one over on Management > companies. If the Management company does not care what spectrum gets > used, and charging just for the antenna space, the more power to you > for being smarter. > > Tom DeReggi > RapidDSL & Wireless, Inc > IntAirNet- Fixed Wireless Broadband > > > ----- Original Message ----- > From: "Chadd Thompson" <[EMAIL PROTECTED]> > To: "WISPA General List" <wireless@wispa.org> > Sent: Tuesday, January 17, 2006 10:30 AM > Subject: RE: [WISPA] Multiple Radios on Single antenna > > >> Who sells dual band antennas? That could save some money on tower >> space and simplify some installations. >> >> Thanks, >> Chadd >> >> -----Original Message----- >> From: [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] >> Behalf Of Tom DeReggi >> Sent: Tuesday, January 17, 2006 9:19 AM >> To: WISPA General List >> Subject: Re: [WISPA] Multiple Radios on Single antenna >> >> >> . However, I am aware of many successfuly using 2.4 and 5.8 from the >> same antenna. >> >> >> -- >> No virus found in this outgoing message. >> Checked by AVG Free Edition. >> Version: 7.1.375 / Virus Database: 267.14.19/231 - Release Date: >> 1/16/2006 >> >> -- >> 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/ > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.1.375 / Virus Database: 267.14.19/231 - Release Date: > 16/01/2006 > > > -- > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.1.375 / Virus Database: 267.14.19/231 - Release Date: > 16/01/2006 > > > -- > 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/
