Using a 396XT. It sounded like analog, so I set it to analog only and search for a tone...no CTCSS. Like I've said before, I'd heard both P25 and analog traffic in the past on the same freq.I have never heard that type of data from P25. I have heard a full time data channel on the USCG, and seen the NAC to confirm it being P25, and it sounds nothing like that at all.
My guess??? Telemetry of some sort...maybe for remote alarming. The FBI used to have all sorts of stuff like that in the old days, but slower data rates.
What scanner was used?
From the transmitter's hang time at the end of your recording it seems to me that 167.4375 is a repeater output. So what is heard maybe getting in through the repeater's input frequency. If you know the input freq. you may want to monitor it. It's strange that no CTCSS is being encoded, in all the FBI repeater interefence cases I've heard, either the 167.9 or EOM tones were present.
But if it is getting into the repeater, it needs a PL of 167.9. And if it is coming from the repeater, he should see the 167.9 PL on the scanner.
I say it is either on frequency data (not common, but I have heard the FBI do it), or an image on his scanner.
telemetry,you mean this sort of deal-e-o..It could be intended data on a frequency12.5kHz either side of the repeater input resulting from poor or no frequency coordination.
This happened for years on an FBI repeater input of 165.9000 analog, ATF's channel 5 simplex 165.9125 analog CSQ would often interfere causing the three associated FBI repeater outputs to transmit semi intelligent voice with 167.9.
Anybody know the 167.4375 repeater input frequency?
Wondering if it might be FAA telemetry data audio.
Off topic, but I have to say this:telemetry,you mean this sort of deal-e-o..
Phila. is test site of new satellite-surveillance radio system | Philadelphia Inquirer | 04/27/2010
the newly online sat system for aircraft?