I’m not sure why TVWS has to be based on WiMAX or LTE. Seems to me you need 4 things:
- comply with the spectral mask including guardbands - work with the spectrum database - bond non-adjacent 6 MHz channels (preferably more than 2) - connectorized for an external antenna It will be interesting how close the FCC rules for 3550-3650 follow TVWS. If they are similar, and Cambium modifies their 3650 version of PMP450, that might be the critical mass for them to look at a TVWS version. That assumes they could meet the spectrum mask and do channel bonding. I don’t think there’s any obvious reason to an outsider why that would not be possible. I know, you’re going to say that you need the WiMAX/LTE voodoo. But do you? If you are just trying to go through trees, and you can operate at a frequency where the trees become translucent to RF, isn’t that enough voodoo? We’re not trying to do mobile voice+data with call handoffs and multipath from urban clutter. Let’s face it, if 900 MHz had enough spectrum for wider channels and wasn’t all polluted from FHSS mesh stuff like smartgrid, it would be fine without any magical supersauce from the cellular world. Maybe I’m wrong about the spectral mask, if the adjacent channel interference requirement is too tight to meet with DSP techniques alone. But with an SDR platform you’d certainly have an advantage over trying to do it with a WiFi chipset. Maybe Ubiquiti’s airPrism technology is an attempt to move in that direction, although that seems to be on the rcv side. From: Mike Hammett via Af Sent: Saturday, September 20, 2014 2:11 PM To: af@afmug.com Subject: Re: [AFMUG] TVWS Alive or Dead? Was: Re: Dear Cambium It's not great, but not as bad as you think. Only the NE most portion of your network doesn't have at least two channels available. That's all Runcom needs. It's not significantly more expensive than the PMP platform and delivers more (throughput and range) than PMP in 900. ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com -------------------------------------------------------------------------------- From: "George Skorup (Cyber Broadcasting) via Af" <af@afmug.com> To: af@afmug.com Sent: Friday, September 19, 2014 8:27:15 PM Subject: Re: [AFMUG] TVWS Alive or Dead? Was: Re: Dear Cambium Don't you still have to get an experimental license for TVWS at this point? Part of the problem here is that we're too close to the Chicago metro broadcast area. There were no usable channels the last time I looked at one of the databases. Even in the more rural parts of our network farther away from Chicago, maybe there's a chance, but it would be too much investment for too little gains. Current cost of the available gear, and future gear probably won't be any cheaper. Plus the HAAT restrictions. If you can use it, great! I hope you do, and make lots of money at it. Seriously. But I have a genuine fear that the FCC, who has been throwing loads of poo at us recently, will change their minds and sunset our access to the spectrum while it's being auctioned behind our backs at the same time they control our transmitters via database. We'll see how the 3550-3700 thing goes. On 9/19/2014 7:35 PM, Matt Jenkins via Af wrote: > You think TVWS is dead? I am curious why. > > I feel it's a hope on the next hill over not a dream on the distant > horizon. > > We are going to trial the Runcom Wimax product ASAP in TVWS. For us, a > lot of our area isn't even serviceable with 900mhz (assuming clean > spectrum). Customer's less than a mile away would have too many trees > for 900 to connect. Yes, even when that 900 was installed 150ft up a > tree. > > TVWS has the chance to reach lots of those who don't have access to > broadband or even cell service. For many people a 2mbps/256kbps is way > better than satellite. They can VPN, game, and VOIP. They might not be > able to stream high def all day but they can get satellite TV for > that. Its the trade off for living so rural. > > For the past 6 months we have been deploying Telrad WiMAX in 3.65 and > it's coverage and performance has been phenomenal. I am really excited > to see what WiMAX applied to TVWS from Runcom can do. There has been > talk about how the FSK is still a thriving product. In perfect > conditions FSK provides 14mbps aggregate throughput. Runcom is > estimating 15-20mbps aggregate throughput in average conditions. You > also get 2 APs per Base Station with a built in ASN or use a gateway.
