You're mostly correct. You need to top -65 dB to get full modulation when you have -95 dB of noise, so you still need the -55 signals if you're near any civilization.
----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com ----- Original Message ----- From: "Marlon Schafer (509.982.2181)" <o...@odessaoffice.com> To: "WISPA General List" <wireless@wispa.org> Sent: Monday, February 10, 2014 11:19:32 AM Subject: Re: [WISPA] Are we being muscled out of the 5265 - 5700 frequencies? I’m with Forrest here. Back in the “back ol’ days” of everyone running amps (we had to back then in many cases) some vendors loved to sell more power. More power means faster service at longer ranges right? WRONG. Carrier to interference level is where your speed and distance comes from. The high power systems, as Forrest says, cause the radios to produce much more *detectable* power outside their main band. That power outside the main band causes the interference. It was always a struggle, but when I used to do interference I convinced many WISPs that LOWER powers would actually improve the performance of their networks. It was nearly 100% true. In the rare cases when lower power levels didn’t work it was because people were trying to use higher powers to over-ride physics and go through trees, buildings etc. One very important note here. If you do try lower power levels you’ll have to lower ALL of the devices back down to reasonable levels (RSSI should be between –65 and –75 for most modern radios to perform their best, –55 will work but see the above notes about self inflicted interference....). A quick check is to shut down all of your AP’s in an area and see what the noise goes to. Oh yeah, very few radios really report accurate interference information. If you are checking those levels via anything other than a real spectrum analyzer you’ll likely find out that there are also other things happening in your area. Call if you’d like and we can talk this out a bit more. 509.988.0260 laters, marlon From: Forrest Christian (List Account) Sent: Sunday, February 09, 2014 9:53 AM To: WISPA General List Subject: Re: [WISPA] Are we being muscled out of the 5265 - 5700 frequencies? I'm going to agree with others... Running outside legal limits doesn't look good to the FCC, and it sounds like you are definitely running outside the limits since you are whining about the ability to run your radios in a mode which seems to have no use than to exceed the limits. I will also add that if you're running all your radios hotter than they should be that your nose floor problem is most likely self inflicted. My experience over the years is that radios are designed to run at a specific tx power and if you're exceeding it you get a lot of out of channel bleed over. Even if the radios don't do this you are introducing far more rf than is likely needed causing an overall rising of the noise floor. Please don't interpret everyone's ire incorrectly. We've just all either dealt with an operator like you are now or have been an operator like you are now. And right now we're trying to gain credibility with the FCC which is hard to do when some operators are flagrantly breaking the rules. Which makes us a bit grumpy. I'm sure some of your neighbors out there would love to help you better understand what you are doing to yourself and help you improve your operations which will in turn improve your quality of service. Heck, I'd drive over there for a weekend if my schedule wasn't so packed. In any case please ask for help in appropriate spots and let us help you reap the rewards of a correctly and legally operating network. On Feb 8, 2014 4:49 PM, "Art Stephens" < asteph...@ptera.com > wrote: Recent events make me wonder if the FCC is trying to muscle wisps out of these frequencies. Since we are primarily Ubiquiti equipment I can only speak from that platform. First the latest firmware update removes compliance test which for about 40% of our equipment deployed would render them unusable since 5735 - 5840 runs at - 50dBm or higher noise levels in our area, Second is new product released only supports 5735 - 5840. Seems like DFS is such a pain that manufacturers do not want to mess with it. Case in point the new NanoBeam M series only support 5725-5850 for USA. Worldwide version which we are not allowed to buy or deploy supports 5170-5875. Seems the only alternative is to go with licensed P2MP which makes more money for the FCC and drives the cost of wireless internet up for both wisps and consumers. -- Arthur Stephens Senior Networking Technician Ptera Inc. 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