Back in 2014, I built a Franklin antenna, and a small fiberglass post to mount it on our roof, to receive ADS-B broadcasts from airplanes with a flightradar24 receiver. We recently had our house fumigated for termites, and since this involves enclosing the entire house in an air-tight tent, it was safest for the antenna …
I was asked in a comment in the previous post to share the details of the antennas I made, so here we go. The other antenna in the picture is the J-pole tuned for the 2m amateur band at 144-148MHz. I actually started out building one for the VHF aviation band at 115-135 MHz, based …
I was asked in a comment in the previous post to share the details of the antennas I made, so here we go. The Franklin antenna was made as described here, made out of #6 gauge copper wire (which is 4.1mm diameter). However, bending 4mm copper wire in sharp angles isn’t so easy if you …
Continue reading ‘More antenna business: The 1090MHz Franklin’ »
Over the last couple of weeks I’ve played a bit with “software-defined radio”. By happenstance, I came across the website Flightradar24 which is a Swedish startup company that is building a global flight tracking network. Airplanes have transponders that reply to radar interrogation, and in the latest implementation called “ADS-B”, they are doing away with …