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Machine gun like sound in El Paso, TX

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lmore3

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I recently got a Midland X-Talker ALR2 and I was scanning the different channels and on 467.6875 there is what i assume to be some sort of data packet. I've read that the sound may be caused by a truck engine but I can still hear the noise even when I'm in my house. I've included a spectrogram of the audio clip. Here it is: https://clyp.it/f11jh4l0
 

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jonwienke

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Sounds like P25 digital. DMR has a slower pulse rate.
 

a417

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There will come a time when Google will return "You are hearing DMR/P25 radio transmissions" when people ask "what is that machine-gun like sound on xxx.xx mhz?"

. It used to be rare & far-between....now it's like carpet bombing.
 

Skypilot007

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That doesn't sound like DMR or P25. It's something else. On a side note I work in a large industrial park and I hear similar sounds on various FRS, GMRS and MURS frequencies quite often. It's some kind of low power data transmissions. I have picked them off with SDR# running DSD plus and I get no decode. Why they are on these frequencies, who knows.
 

nd5y

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Wichita Falls, TX
That doesn't sound like DMR or P25. It's something else. On a side note I work in a large industrial park and I hear similar sounds on various FRS, GMRS and MURS frequencies quite often. It's some kind of low power data transmissions. I have picked them off with SDR# running DSD plus and I get no decode. Why they are on these frequencies, who knows.
Right. Its some type of SCADA.
 
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