Need some radio scanning expert to help me out.

Hi there guys

I got my RTL832u stick in the post, about 2 weeks ago, and it's amazing what I can recieve in my area with a small antenna.

I've already figured out how to decode pagers, and it's fascinating to watch all the text come up on the screen.Round about 152mhz, I hear this strange tone. I know it's data of some sort, but I'm not sure what kind.

I've taken a 7 second sample of what I'm hearing, hopefully somebody here will know.Here's the link.

https://mega.co.nz/#!EFVh3DoT!Q41DIX99XXMPAQ7XjSlZckOz6sYQHVcYMOl4dfUrcBM

Would somebody who knows what it is please let me know?

Thanks