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A comment on Software-Defined Radio for Engineers (2018) [pdf]. Parent comment

Re:Software-Defined Radio for Engineers (2018) [pdf] by rtrunck on Monday March 10, 2025 @06:15PM (#43326720)
As a pilot with an amateur radio license (though an inexperienced ham) this sounds really interesting. Could you elaborate more on building the VOR receiver?
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Re:Software-Defined Radio for Engineers (2018) [pdf] by mikewarot on Monday March 10, 2025 @06:44PM (#43326976)
The transmitter has an electronically switched antenna that virtually moves in a circle at 3600 rpm, causing FM modulation phased with direction. The carrier is also AM modulated with a reference phase signal.

I built a gnu radio flowgraph to receive both and display heading to the VOR.

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Re:Software-Defined Radio for Engineers (2018) [pdf] by pyinstallwoes on Monday March 10, 2025 @07:18PM (#43327289)
Woah coming from a dsp / synth background that’s wild to hear.
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Re:Software-Defined Radio for Engineers (2018) [pdf] by mikewarot on Tuesday March 11, 2025 @11:47AM (#43333650)
Sorry I was working from memory yesterday... It's 1800 rpm / 30 Hz, not 60.

https://en.wikipedia.org/wiki/VHF_omnidirectional_range

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