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It could be a licensee, or some rougue radio dealer that setup and unsuspecting customer with SCADA-like or simple remote controlling hardware, it could very well be simplex. You can use DTMF encoder/decoders to kick on relays for various things, setup/knockdown repeaters, etc. The receiver radio basically has an output that drives a relay and then things that can be done are many...high and low voltage switching. It could also be a trigger of some sort sending the DTMF, and the receiver just goes into alarm to signify something happened....could be an alarm, alert, water level, power out, door that opened...etc. Those are some more elaborate examples, but in the radio biz I setup a fire departments' big siren on the roof of the FD to blow by remote, also setup thier garage doors to go up when a certain code was used, and a real cool one...gas pumps active for 15 minutes after a code was put through. If you are hearing a rapid string, it is pre-programmed and is likely intentional. Legit use of the freq? Probably not.

I have a 14 year old kid in my neighborhood that heard me on his bubble pack radio and called for me. I answered and told him about the GMRS thing. He now listens to ch15, our receive for our repeater pair, and pushes his call button on ch1 when he hears me get home. I talk to him all the time now. I told him to tell his parents what he is doing and keep them informed. He knows who I am and what I do, and has confirmed it with the deputies at his school. His parents are fine with it and he is really getting into radio because of it. I found him a scanner for next to nothing, and have cleared it with his parents to give it to him. He wants to be a police officer and really likes talking with me. I think he is even going to join my office's explorer group. All that from hearing us on a bubble pack radio. Sounds like a next generation radio guy. Jerry