Email from a reader

Thanks for the spreadsheet I did end up adapting it for our own use but decided not to go into economic viability at this time in Canada the are just too many unknowns.

Right now we still don’t have a data base administrator in Canada and the regulations haven’t been enacted, one big issue is channel bonding the government tells me they are working on it for 2 adjacent channels (we would like more) and this would make a huge difference to what we can do with present equipment

 The 6Harmonics gear we are using is already capable of this, it was just a software upgrade.

Anyway we have been running a small test project and our preliminary report is available here, please feel free to spread it around but bear in mind it is preliminary if you spot any typos or bad links please let me know, also anything you might like added.

Thanks for your help in the past.     Colin Mudle

TV White Space hype

We all know that TVWS has been substantially hyped.  In the USA especially, it has been quite disappointing.  I won’t name any names, but I (and some people following this blog) have been already burned…. That may be what we get for being innovators, early adopters & leaders.

That being said, 6Harmonics appears to be making strides in TVWS tech for markets outside of USA.  There, where there is more spectrum available and local regulators allowing more power… interesting results may flourish

I’m hearing whispers of 150Mbps theoretical deployments coming next year.  We’ll see; it may happen, it may not. Definitely, expecting real world deployments to live up to their theory has only been a recipe for DISASTER in the TVWS world as we have lived and learned.

Here is a site where you may monitor some new trials, happening in rural Canada, funded by the Canadian Internet Registration Authority – these are the guys that get some of the money every time you register a Canadian website on the web.




All the Ways Your Wi-Fi Router Can Spy on You

From The Atlantic:

By analyzing the exact ways that a wi-fi signal is altered when a human moves through it, researchers canSeewhat someone writes with their finger in the air, identify a particular person by the way that they walk, and even read person’s lips with startling accuracy-in some cases even if a router isn’t in the same room as the person performing the actions.

After memorizing body shapes, the system, which the researchers named FreeSense, watches for people walking across its line of sight.

A pair of MIT researchers wrote in 2013 that they could use a router to detect the number of humans in a room and identify some basic arm gestures, even through a wallA group of researchers led by a Berkeley Ph.D. student presented technology at a 2014 conference that couldHearwhat people were saying by analyzing the distortions and reflections in wi-fi signals created by their moving mouths.

Bullet Points Summary: State of LTE-Advanced

Here’s a neat article on the state of “LTE Advanced”:

Executive Summary:

  • 5G standardization is expected no earlier than 2020
  • The term “LTE-Advanced” really means LTE Carrier Aggregation. LTE Carrier Aggregation is the combining of two (or more) LTE component carriers into a wider logical channel, allowing for faster peak and median downlink rates, and more efficient network resource utilization.
  • We are expecting to see 4×4 MIMO capable smartphones making their way into the US market before the end of the year – Sony demoed a phone at Mobile World Congress 2016 that achieves a 400Mbps over the air speed out of a single 20MHz channel with 4×4 MIMO.  So, at least one OEM has figured out antenna design for MIMO!
  • Bleeding edge techniques that increase SINR (Signal to Interference Noise Ratio) will enable the possibility of 256 QAM deployments, that send 8 bits per transmission, 33% more efficient than 6 bits per transmission.  256 QAM is something that can be enabled with a firmware upgrade.

Feasibility Calculator for TV White Space

Made a feasibility (cost and ROI, or Return on Investment) estimate calculator. This focuses on TV White Space equipment using the 6Harmonics vendor.

If you have any questions about using the calculator or simply want to talk some ideas over, contact me at +1 (917) 754-7298 or send an email to [email protected] – I’d be happy to give you access to the spreadsheet or google doc.

The main takeaway that you should be reading from this is that TV White Space is not that great of an opportunity for most Wireless ISPs, since the ROI (24 months, but maybe less if you custom configure a setup..) and cost layouts are not great, especially considering the low bandwidth throughput (60mbps raw rate per tower, and as you can see from the spreadsheet, that is divided up into many subscribers, especially once you take the subscription factor into account).

TV White Space is appropriate when you both (I) absolutely need a Non-Line of Sight solution and you do not have high bandwidth requirements.


FCC height limitation for antennas in the TVWS band..

A site with an elevation of up to 220 meters above average terrain could be used with a 30-meter antenna, or a site with a higher elevation above average terrain could be used with a shorter antenna, provided the sum of the site elevation above average terrain and antenna height above ground does not exceed 250 meters.

Source:  2012 Memorandum;


This article offers a very helpful guide on how to use the FCC HAAT calculator, using just Google Earth and the lat/long coordinates of your tower.



But let’s say you absolutely need an exception:

Then you will need to submit a written, factual statement to the FCC justifying a waiver – why you can’t build at 30 meters, what public interest benefits there would be, etc.  Lerman Senter PLLC is one firm that could help you (you would have to contact them directly for a quote); or we could introduce you.