But previously you said you used the same cards and the original cards were xr5s?
Tom DeReggi RapidDSL & Wireless, Inc IntAirNet- Fixed Wireless Broadband ----- Original Message ----- From: "Kurt Fankhauser" <k...@wavelinc.com> To: <wireless@wispa.org> Sent: Wednesday, April 29, 2009 6:28 PM Subject: Re: [WISPA] RB333/433 eliminating self-interference test > > The RB600 was not in an indoor enclosure but just a normal outdoor > enclosure. The radio's were all low power CM9 cards and they were seeing > each other at -30's. > -- > Kurt Fankhauser > WAVELINC > P.O. Box 126 > Bucyrus, OH 44820 > 419-562-6405 > www.wavelinc.com > > > --------- Original Message -------- > From: WISPA General List <wireless@wispa.org> > To: WISPA General List <wireless@wispa.org> > Subject: Re: [WISPA] RB333/433 eliminating self-interference test > Date: 04/29/09 16:41 > >> >> Good point but..... the problem went away when the mcpi cards each had > their own SBC/Case, this would infer card to card or pigtail to pigtail > interference, since in all cases the dummy load was outside the cases, > from > what it sounds like. >> >> I guess that should be clarified.... >> >> Kurt, when you tested with teh RB600 and 3 cards on the adjacent slots, > was the RB600 also in a case with the holes metal taped? >> >> >> Tom DeReggi >> RapidDSL & Wireless, Inc >> IntAirNet- Fixed Wireless Broadband >> >> >> ----- Original Message ----- >> From: Jason Wallace >> To: WISPA General List >> Sent: Wednesday, April 29, 2009 12:11 PM >> Subject: Re: [WISPA] RB333/433 eliminating self-interference test >> >> >> Also, some dummy loads can act as a poor antenna. Was this part of the > experiment consistent both times? Maybe run some coax from the boxes > separate directions and then attach the dummy loads? >> >> Scott Carullo wrote: >> Another quick note... if you have individual units why even mount them >> like this inside a larger box? Why not put individual RB411s in their >> own > >> small box (say DCE 7x6x2) and put the box outside right under the >> antenna? > >> Then you would have even more seperation and distribute you eggs a bit > more >> too... >> >> Scott Carullo >> Brevard Wireless >> 321-205-1100 x102 >> >> -------- Original Message -------- >> From: "Kurt Fankhauser" <k...@wavelinc.com> >> Sent: Wednesday, April 29, 2009 10:36 AM >> To: "WISPA General List" <wireless@wispa.org> >> Subject: [WISPA] RB333/433 eliminating self-interference test >> >> About a week ago there was some discussion about 5ghz radio's being >> installed in the same board and causing self-interference on adjacent >> channels and possible even on the entire band thus decreasing throughput >> on >> backhauls. Because even if you were operating on frequency's 5745 and >> 5825 >> the two radio's would have side lobe harmonics that if installed in the >> same >> enclosure they would still "hear" each other at that short of > separation. >> I >> decided to combat this problem and find a solution and share my >> experience >> with the list. >> >> >> >> I installed a single XR5 card into 3 different RB433's with indoor >> enclosures. I also installed foil tape which I obtained from the local >> True >> Value store for $2.49 on all the vent holes and unused bulkhead >> connector >> holes. This was done in order to prevent RF side lobe leaks from the >> three >> radio's that would escape from the indoor enclosures themselves. Having >> only >> 1 card inside each enclosures I should not have a heat problem as the >> outdoor box will not be in direct sunlight. >> >> >> >> I then stacked all 3 enclosures on top of each other with dummy loads on >> each of the N-bulkhead connectors and did some testing. This is what I >> found: >> >> >> >> I set the bottom board as AP and the middle board as Client on frequency >> 5825. Even with this close of separation the two XR5's could only see >> each >> other at -83 on the same channel. With the top board connecting to the >> bottom board they could only see each other at -90. Keep in mind this is >> on >> the same frequency so adjacent channels should be much less than that >> possibly even in the -100 ranges. Wish I had a spectrum analyzer. With >> two >> boards separating the AP and Client there was no link at all. The two >> boards >> could not even see each other in an AP scan. >> >> >> >> Just as a comparison with the same radio's installed all on a RB600 not >> on >> top of each other but in the adjacent mpci slots the radio's were all >> seeing >> each other at -30's. So I gained roughly -55 db of separation by doing >> it >> this way. So all I would have to do now is make sure that the antennas >> on >> the tower have at least 10 foot of vertical separation and the >> self-interference problem should be gone and I should be enjoying much >> more >> throughput! >> >> >> >> Thoughts anyone? >> >> >> >> >> >> Kurt Fankhauser >> WAVELINC >> P.O. Box 126 >> Bucyrus, OH 44820 >> 419-562-6405 >> www.wavelinc.com >> >> >> >> >> >> >> >> >> >> >> > ---------------------------------------------------------------------------- >> ---- >> WISPA Wants You! 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