Data bursts on yellow dot

[Tim-B]

Does anyone know who is transmitting data bursts on the yellow dot itinerant frequency (464.55 MHz) in Lafayette in the area near Cajun Field or Blackham Coliseum? I am hearing a series of 1/2 second burst follow by 1/2 second of silence, then burst, silence, burst, silence over and over for several minutes then quiet for a couple of hours then several minutes of bursts again. Fatima school was using that freq for their maintenace people but they have since moved to another frequency after the bursts began.

It sounds exactly like this but the transmissions continue on for far longer than the clip below:

http://kb9ukd.com/digital/452.825-telem.wav

If you play this clip and set your media player on a continuous loop to play the clip over and over then you will hear exactly what I am hearing on the frequency. Can anyone ID what kind of data transmission this is or who may be using it?

I did a license search in Lafayette for that frequency and among the results I found that there were several companies that do GPS/RTK surveying like Fugro Chance and C.H. Fenstermaker, etc. Maybe this is some type of surveying telemetry?

 

[slayer816]

That reminds me of train EOT telemetry I used to try to follow with an old BC350. It's probably changed since then (I programmed everything in my first scanner since I was thrilled just to hear noise).

Ahh memories. Data sounds aren't that impressive anymore but I still like to figure out who is beeping. I would bet money its telemetry.

 

[nd5y]

It's GPS RTK. Probably something like this Trimble

 

[Tim-B]

That's what I figured. I have been out in the field with surveyors before when they were surveying in the Houma area for an oil and gas seismic shoot about 15 or so years ago. On that trimble website on the home page there is a picture of a tripod with a white disk about a foot in diameter on top of it. The surveyor I was with had and antenna like that one a pole about 7 feet long and it was connected by wire to a box he carried. He used it to find the exact points for shot holes and receiver probes. He said it was accurate to about 6 inches.

 

[ecps92]

+1 And it's worse when you find them interfering with a Repeater , because they are on the 465-470 side.

I recall a thread last year, where one was in the Amateur band, up in Canada

It's GPS RTK. Probably something like this Trimble