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SDR Based Flight Tracking

I recently had the need to track the arrival of a flight into the airport near my house.  Of course, I could use any of the online services available for this, but being a HAM radio operator, I wanted to track this data myself.  I discovered that with a $30 RTL-SDR dongle, this can easily be done.

First, I built a co-linear antenna for this.  This is a simple antenna made by connecting stub pieces of coax together.  I opted for a 4 element co-linear which is not the best configuration.  I will at some time build an 8 element and place it within a PVC pipe.  This is just a proof of concept.

Using the plans here https://www.balarad.net/ I made a 4 element antenna.

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