On Mon, 2011-02-14 at 11:59 -0600, [email protected] wrote: > My experience is that with the crappy little grey or black pigtails your > signal sucks. The copper braided pigtails like the Laird/Pac ones seem to do > great. Not that I 'm downing Wisp-router, but they have always carried the > crappy ones. I have avoided ordering any pigtails from them for quite a > while so I don't know if they are still shipping those. Roc-noc, Wlanparts, > Titan, to name a few always seen to ship the good copper ones. I've had 72 > clients connected to a Mikrotik AP running a horizontal omni with little > performance issues besides that fact that it had 72 clients on it... :) > > > Chris >
Wow! 72 clients on an omni. That's impressive. Thats probably the only antenna trasnmiting around that area. I have an omni with 20 clients and get all sort of interference problems. Well, I'm glad I got a lot of explanations from the list. I WILL be printing these to show my friend. I just learned he has 6 radios installed on a RB600. How about that for self interference.... > -----Original Message----- > From: Brian Webster > Sent: Monday, February 14, 2011 10:06 AM > To: 'WISPA General List' ; [email protected] > Subject: Re: [WISPA] My friend's logic > > I agree with Fred. It's not about the number of clients that causes the > problem. The physical separation of the radios is probably the key factor in > the increased performance. Putting multiple radios with possibly leaky > pigtails inside the same enclosure can introduce opportunities for > self-interference by near field RF energies and mixing products. Unless an > enclosure have been specifically designed, tested and built for that > particular combination or radios and cable routing, there is no telling how > it may or may not perform. Adding more radios to the MT just compounds the > problem. Having the RF section outside the MT box is never a bad idea to > avoid this phenomenon. > > Thank You, > Brian Webster > Skype: Radiowebst > www.wirelessmapping.com > www.Broadband-Mapping.com > > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of Fred Goldstein > Sent: Monday, February 14, 2011 9:35 AM > To: [email protected]; WISPA General List > Subject: Re: [WISPA] My friend's logic > > At 2/14/2011 08:50 AM, OptimumWS wrote: > >Hello. > > > >Thought I share this with the list. > > > >I have a friend that is using MT as ap on one of his towers with his > >radios in 10MHz and on another tower bullets with sector panels, > >similar set up on both towers except for the radios. He was explaining > >that he finds the bullets outperforms the ubiquiti radios on the MT by > >far. His > >explanation: > > > >"The reason why bullets outperfoms the radios intalled on a router > >board is because of the pigtail used from the radio to the antenna. > >This pigtail works like a electricity cable in that the thicker the > >cable the more current is able to pass through so, the mikrotik > >pigtails are way too thin. When there is a certain number of clients > >connected to that radio the pigtail saturates the radio traffic because > >of the 'high traffic or current passing through the pigtail' and as a > >result; links between clients and ap can be slow and performance > >decreases. Now, the bullets do not have any pigtail or other connector > >and thats a reason why links with bullets are more stable and performs > >better than having a routerboard and radios with pigtails." > > > >What you guys think of his logic? > > > >Note: > >Posted this on dslreports wisp mainling list as well so, for those also > >registered to that list: sorry for the double posts. > > This was discussed on some vendor forums too, I think UBNTs. > > Most pigtails shipped with radios are too cheap for their own good. They > are not properly shielded. Some WISPs have found that they can put more > radios on a tower if they use better pigtails, which they either make > themselves or hand-select (one person found that Laird pigtails were > sometimes good, but not all of them). > > Pigtails can be lossy, reducing effective antenna gain, and can leak, which > makes it susceptible to local interference. This has nothing to do with the > number of clients, though. That's just silly. > > > -- > Fred Goldstein k1io fgoldstein "at" ionary.com > ionary Consulting http://www.ionary.com/ > +1 617 795 2701 > > > > ---------------------------------------------------------------------------- > ---- > WISPA Wants You! Join today! > http://signup.wispa.org/ > ---------------------------------------------------------------------------- > ---- > > WISPA Wireless List: [email protected] > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 10.0.1204 / Virus Database: 1435/3443 - Release Date: 02/14/11 > > > > -------------------------------------------------------------------------------- > WISPA Wants You! 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