Hi all.
I've stumbled across this thread as I too have noticed the "beeps" which are still being broadcast on 91.9 FM @ 12/09/2014.
Can anyone recommend a site / method of trying to nail down what they are? No real reason, but I have a theory and it's driving me mad not knowing...
Having spent some time listening, I've established that "normally" you hear one high-pitch beep or tone, roughly once a second. At times, this stops and after a short length of silence (not timed it exactly, but it feels like 30 seconds / 60 seconds), you get a single low-tone beep.
This low-tone single beep will then be repeated, including the silence gap OR at some point, instead of this low-tone single beep, you hear five quick high-pitch beeps, followed then by the single high-pitch beep every second.
I've always been fascinated by things like "Numbers" Stations, the Conet Project, and odd sounds you can pick up on the radio, and so this intrigues me greatly.
My theory is that this is some sort of "tracking" signal like you sometimes see naturalists using where-by they fit a radio collar to a Grizzy Bear or some other animal, then follow its movements by using a directional Ariel.
I get the impression that the continuous beeps are some sort of "moving" or "all OK" transmission, and the pauses and low-tones are some sort of indication of a loss of signal / non-moving condition. The five-beeps after single low-tone appears to be a "re-established" / "moving again" indication.
I've listened to this signal for a number of days and heard solid periods of low-tone beeps and pauses, solid long periods of the continuous once a second beeps and everything in-between.
Anyone want to speculate / suggest a way of researching this? I did stumble across Gun Dog collars that emit tones in the field, but nothing that made me think "That's it..."
Given that Grizzly Bears aren't that prevalent in darkest Chelmsford, Essex, I'd love to get to the bottom of this.
My next thought would be to try tuning into 91.9 at different locations, moving further out from where I can currently hear the signal, to see if it gets stronger / weaker and narrow down whether it's a local broadcast etc. I've tried researching the tone patterns on the 'Net and the frequency, but come up blank.
Thanks for any input.
Regards
Last edited by James UK : 13-09-2014 at 15:58