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Field notes on complex Wi-Fi.
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Free Space Path Loss Diagrams
Free Space Path Loss (or FSPL) represents the amount of energy that a given radio wave loses as it travels through the air away from its source. Understanding FSPL will help us understand how far a Wi-Fi signal can go. It is also widely used by Wi-Fi survey tools to predict Wi-Fi signal propagation.
François Vergès, CWNE #1805 min read
60GHz Regulations in Canada
Wi-Fi, as most of us know, operates on the 2.4GHz or 5 GHz band. But there are, actually, others 802.11 protocols utilizing other frequency bands (900MHz, 60GHz,…). Today, we will be talking about the regulations of using the 60GHz frequency band in Canada. This band is used for the 802.11 protocols known as 802.11ad (now 802.11-2016 Clause 20) and 802.11ay.
François Vergès, CWNE #1802 min read
Motion Detection System creating Interesting Interference
If you are like me and you love interference stories, this is one of them! I came across this interesting interference while I was performing an assessment for one client.
François Vergès, CWNE #1801 min read
Interference that looks like Wi-Fi but is not (Televic Conference System)
Performing a spectrum analysis for one of my customer last week, I discovered a funny interference I wanted to share with you. The interference was found in a training classroom of a typical office environment.
François Vergès, CWNE #1803 min read
Co-Channel Contention (CCC) explained with simple drawings
I came across some documentation I have made and I was explaining how Co-Channel Contention can have a bad impact on airtime using simple drawing. I thought I might as well share these diagrams with you! I have included the PDF and Microsoft Visio version so you guys can change the colours if you would like.
François Vergès, CWNE #1801 min read
Industry Canada new 5GHz band regulations
UPDATE – July 2025: ISED has updated their radio standards specifications for Wi-Fi equipments operating in the 5GHz frequency band. Check out this article to see what is new: Updated 5 GHz Wi-Fi Regulations in Canada (RSS-247, July 2025)
François Vergès, CWNE #1803 min read
Make Wi-Fi Visible S02E01 – Omnidirectionnal Antennas
Welcome to season 2 of "Make Wi-Fi Visible"! Previously in season 1, we presented radio frequency features using light analogies. In this new season, we are going to focus on antennas.
François Vergès, CWNE #1802 min read
Make Wi-Fi Visible – Season 1 Recap
As 2014 is ending today, this makes it the perfect day to do a recap of the first season of Make Wi-Fi Visible. This series of articles is aimed to explain Wi-Fi concepts using the light analogy.
François Vergès, CWNE #1802 min read
Make Wi-Fi Visible #6 – Radio Frequency Absorption
As we all know, Wi-Fi is amazing. The only thing is… it’s invisible.
François Vergès, CWNE #1801 min read
Make Wi-Fi Visible #5 – Radio Frequency Scattering
As we all know, Wi-Fi is amazing. The only thing is… it’s invisible.
François Vergès, CWNE #1802 min read
Make Wi-Fi Visible #4 – Radio Frequency Diffraction
As we all know, Wi-Fi is amazing. The only thing is… it’s invisible.
François Vergès, CWNE #1802 min read
Make Wi-Fi Visible #3 – Radio Frequency Refraction
As we all know, Wi-Fi is amazing. The only thing is… it’s invisible.
François Vergès, CWNE #1802 min read