In January I was asked to speak to the Kitchener COPA group about the work I have been doing. Full disclosure I sell Stratux hardware on amazon.ca, if you purchased a Stratux kit from there it was from me.
I have been active in the Stratux community since the beginning and have been working to develop an inexpensive ISM band ground station so that we can get subscription free in flight weather data similar to the US ADS-B network. There is another group working with Nav Canada and IC along with the FAA on a test site for UAT station but they appear to be bogged down getting those groups to cooperate.
We have gone over a few different radio options in the last year and have settled on using the TI CC1310 since it does a great job of decoding UAT (and just about any other FSK signal). LORA was considered as well and gave excellent range but the closed protocol and limited chipsets made it less attractive then a more generic chipset. We considered using high power base stations to get range similar to the US towers but the industry Canada licenses would have been cost prohibitive. The ISM bands in Canada and the US allow for unlicensed transmitters to operate at up to 1 watt so we figured we can start there. The CC1310 has a companion amplifier that boosts the output up to 1 watt and the entire thing can run off of a USB port so it is ideal for what we want to do. The test samples of the CC1310 with the 1 watt booster are currently is production, hopefully we can get some out for testing by the end of March.
The transmitter and receiver setups are pretty simple, they are both basically just a Stratux with a V3 UATRadio running different software. The transmitter will have a 1 watt radio while the receiver just uses the standard UATRadio. The transmitter does not need a 1090 MHz SDR but ideally will have a GPS installed.
The software for the transmitter is pretty simple, it just connects to a wifi or Ethernet network and pulls data for the surrounding area and starts broadcasting. Because we are using low power a good antenna with a clear view of the sky will be a must.
The receiver is even easier it is just a Stratux with a UATRadio and a version of the software that supports the protocol. The EFB's don't seem to care where the data is coming from and even display the tower locations correctly (I test with Foreflight and FltPlan GO.)
For more information check out http://canada.stratux.me/ there is a google group linked there which we are using for discussion.
My printer is not in very good shape after being run hard like that.
An enclosure is something that will need to be thought about. I have my antenna mounted on the peak of my roof and the pi lives in the attic in a normal Stratux case.
Ideally we keep the distance to the antenna short and power the pi via POE.
There were some issues with the 1 watt radios and the main developer does not have much time to work on them.
The google group is private so I can approve you later this evening.
If you are interested in doing some test flying it will work with the standard UATradio but at 25 mw it likely won't have much range.
The only person still actively testing is a guy in India who has government permission to operate at high power, it appears to work quite well with a properly sited tower.