For a channel to be available both ends have to be clear for many many miles. They keep this band pretty pristine due to the long distance nature of the use. I think they keep it cleaner than is needed but the rules were probably created back in the analog era.
From: Faisal Imtiaz Sent: Tuesday, November 28, 2017 11:17 AM To: af@afmug.com Subject: Re: [AFMUG] PMP on 6 GHz That is a fair question.... but I think it needs to be answered by the Hardware Mfg as well.. in terms of how much SNR do they need for max modulation. While I am open to being 'educated' and gain a better understanding ... up to now, from what I see in the field, I see the the manner in which Licensed Freq are allocated / acquired is tremendously wasteful... Lots a lots of 'holes' in the part 101 allocations e.g. for a channel to be available, it has to clear both locations A & Z, so if A is congested, and Z is not, one cannot have a clear channel. or (more realistic).... if A and Z have just the right mix of channels in use, then while one cannot have a free channel, but there is plenty of open spectrum. Keep two things in mind.. that this conversation / dialog with the FCC is within the context of two key points. 1) Protect the licensed links 2) open up more freq in the band. 3) allow for PTMP use (using similar mechanism as CBRS band). So.. I am curious to hear what is the "Technical" argument, and what is the "practical" argument and would like to separate it from 'knee jerk' reactions. Regards Faisal Imtiaz Snappy Internet & Telecom http://www.snappytelecom.net Tel: 305 663 5518 x 232 Help-desk: (305)663-5518 Option 2 or Email: supp...@snappytelecom.net -------------------------------------------------------------------------------- From: ch...@wbmfg.com To: af@afmug.com Sent: Tuesday, November 28, 2017 12:17:25 PM Subject: [AFMUG] PMP on 6 GHz Over on the WISPA list, they are discussing the idea of unlicensed PMP on 6 GHz part 101 frequencies. If Tim Hardy or Liz Creekmore are on, I would like to know how far down an interferer must be to get a channel on the lower portion of that band. I know that I could not get on license due to the fact that someone else was on the freq about 100 miles away with their antenna pointed away from us. But the F/B ratio or a side lobe said our signal would still interfere with them. I can only imagine that someone lighting up on your 6 GHz channel, even low power indoors would exceed the interference limit in many cases if they were within 10 miles or so of your antenna. But it can be calculated. Like to know the real numbers. I think that the protection must exceed the protection from other licensed systems. And that is likely impossible.
