Recently we at @ttncat had to prepare a crash course on LoRa, LoRaWAN and The Things Network for a professional school in Barcelona. It was a 15 hours course that covered from the very basics to some more advanced topics on RF like link budget, attenuation or impedance matching. It was fun to go back to my years at college and revisit and update some of those topics. And at the same time it was a great opportunity to upgrade my toolbox.
I’d like this to be the first of a series of posts about radio frequency. Talking about tools and devices I already had and some of the new ones I now own. I think they might be of some interest for newbies and makers since -due to my budget- they tend to be low cost devices. At least I hope you will find it interesting to know they exist.
I don’t pretend to write these posts in any specific order but I’m just starting with what I feel is one of the most basic concepts, and it’s that a radio device outputs energy. So maybe one of the first questions is “how much energy?“.
So RF power monitoring is the first step to analyze how a certain radio sends data by quantitatively measuring how much energy it outputs. You probably know this is called “power” and power is measured in Watts (W). Radio Liberty (a CIA-founded organization meant to broadcast anti-comunist propaganda) had a facility in Pals, Girona, from where they could reach as far as Moscow. The facility consisted on 6 radio towers with an overall output of 1.5MW (that’s megawatts).