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Mystery signal from a helicopter

www.windytan.com Research & data Technical reports Hardware & electronics Class of 2023-01 Hall of Fame
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Resurfaced independently across 6 calendar years, with breakout response in 2 of them.

submissions
6
submitters
6
observed span
2014–2023
peak thread · 78 comments
1101 pts
latest 20+ return · 2023-01-24
177 pts

Submission timeline

2007–2026

One slot for every year since HN launched. Height is that year's peak points; orange marks a 100+ point or 50+ comment breakout. Select a bar to open its strongest thread.

First comments on top threads

HN comment order

We operate news helicopters at TV stations around the US and they all use a similar system. Basically the right channel of audio is typically the microphone from the pilot or reporter and the left channel is the audio feed transmitting what is basically modem data back with the GPS coordinates of the helicopter and some other data. This data is used at the antenna site to track the helicopter and point the antenna in the correct direction to keep…

graupel·1101-point thread·

Sox is amazing. I used it about 10 years ago to take raw audio of paintball guns shooting and help pre-process said audio for analysis of shots per second. It was great for a bunch of reasons: - it could so a frequency analysis to show me which frequencies were present in the audio - I figured out there was the frequency of the sound when the ball left the barrel but also a frequency for the gun's firing mechanism…

Her blog is full of all kinds of really cool projects! I encourage you to check them out.

The first top-level comment from each of the four biggest threads, in HN’s own order. Excerpts are shortened; open a comment for full context.

Breakout years
2

100+ points or 50+ comments

Total points
1290

reference only — not used in Hall rules or ranking

Total comments
106

reference only — not used in Hall rules or ranking

Every submission

DateTitle as submittedByPointsComments
2014-02-01Mystery signal from a helicopterFirst breakout · Best threadschappim110178
2015-03-10Mystery signal from a helicopterfilleokus40
2017-04-03Mystery signal from a helicopterkNawade20
2020-11-20Decoding Helicopter GPS Coordinates from a YouTube Video (2014)frakt0x9031
2021-05-06Mystery Signal from a Helicopter (2014)_Microft30
2023-01-24Mystery Signal from a Helicopter (2014)Hall induction · Latest 20+ point returntomduncalf17727