Personally I also feel there is a flaw in the way EIRP is regulated on FHSS systems. The limit in 900 MHz is on total EIRP, not power spectral density. Somehow the FCC feels it is OK to concentrate 4 watts in one narrow hopping sub-channel as long as the dwell time isn’t too long. That’s like saying you can use a magnifying glass to concentrate sunlight on a single ant and it won’t hurt the ant as long as you move it to a different ant every second. No, you end up with a bunch of smoking ant carcasses on the sidewalk.
Also the smartgrid mesh networks seem to violate the spirit of the requirement that you can’t get around the EIRP limit by using multiple transmitters to send the same data, for example in a MIMO system. From: Jeremy Grip Sent: Tuesday, March 10, 2015 12:10 PM To: af@afmug.com Subject: Re: [AFMUG] More LTE tradgedy of the commons on 5 GHz.. +1 From: Af [mailto:af-boun...@afmug.com] On Behalf Of Peter Kranz Sent: Tuesday, March 03, 2015 12:02 PM To: af@afmug.com Subject: Re: [AFMUG] More LTE tradgedy of the commons on 5 GHz.. I think the point some are missing is the lesson learned from 900Mhz and smart meters. While 900Mhz is unlicensed spectrum, a single operator has managed to take it over in California to the point where no other user has any chance of using the spectrum for commercial purposes. By this I mean that PG&E’s deployment of smart meters on every power meter in the area, and on top of power poles, and other high sites, has raised the noise floor on this band to unusable levels for high speed communications. So by means of overwhelming numbers, PG&E managed to take over 900Mhz for its own users, stranding the investment of ISPs in this spectrum in affected markets. I don’t think the commissions initial concept of unlicensed spectrum was that a single operator would do this, I think they expected operators by this to use licensed spectrum. I’d like to see a limit on how many systems a particular entity can deploy in an unlicensed band. It could be some high number, like 1 million units. Peter Kranz Founder/CEO - Unwired Ltd www.UnwiredLtd.com Desk: 510-868-1614 x100 Mobile: 510-207-0000 pkr...@unwiredltd.com
