Could someone tell me what is making this signal?

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nd5y

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It might help if you posted the frequency and location where it was heard.
It sounds like 1200 baud AFSK data like what is used by SCADA, ANI and OTAR.
 

5Rya

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I'm surprised as its been going on for at least an half hour on and off. I would think the dispatcher would come on and say there is an open mic.
 

RFI-EMI-GUY

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It is probably SCADA. If this is a fire dispatch channel, it could be Zetron fast FSK polling various fire stations to ensure a link is available for the station alerting. You should hear voice dispatch occasionally. Otherwise it is just SCADA terminals such as used at sewage pump stations .
 
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