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13995 USB Digital Signal

simpilo

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Joined
Sep 18, 2018
Messages
504
Location
Oklahoma City,OK
Looks like digital maybe a form of RFID but I doubt it's RFID because RFID sounds different. Sounds like a sick Motorola Smartzone control channel. Similar was on 13985khz USB

 

DaveNF2G

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Jan 23, 2001
Messages
9,211
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Rensselaer, NY
That used to be a MARS band. I don't know if it still is, but if it is something connected to the military, then the protocol might be STANAG.
 

ka3jjz

Wiki Admin Emeritus
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Jul 22, 2002
Messages
21,765
Location
Bowie, Md.
I would tend to suspect a PACTOR idle, at least that was my first guess when I heard it...the repeating tones are typical of an idle signal, or a modem waiting for input....Mike
 
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