LiveATC Discussion Forums

Air Traffic Monitoring => Aviation Audio Clips => Topic started by: Squawk 7700 on September 26, 2009, 12:20:08 AM

Title: Mystery Interference Short Bursts *Mystery Solved*
Post by: Squawk 7700 on September 26, 2009, 12:20:08 AM

Mystery interference?

Audible as 6 short bursts in the attached audio clip. I hear this regularly in the air band, and today it was captured on the LAX feed. (Thanks to the KLAX feeder).

Wondering if anyone out there knows what this is? Pager? Intermod??? :?

Thanks.

Title: Re: Mystery Interference Short Bursts
Post by: dave on September 26, 2009, 07:53:00 AM

Sounds like either:

1) Packet radio transmission, or,
2) mobile data transmission

-dave

Title: Re: Mystery Interference Short Bursts
Post by: pilot_ngb on September 26, 2009, 09:03:25 AM

It's an ACARS tranmission.

Title: Re: Mystery Interference Short Bursts
Post by: Squawk 7700 on September 26, 2009, 10:46:08 AM

You guys are good!

I learn something new from this site every time!

Loaded up the scanner with known VHF ACARS frequencies and bingo, mystery solved.

Made a recording of what the ACARS data bursts sound like which confirms what I've been hearing for all these years.

Thanks LiveATC! :-D



 

Title: Re: Mystery Interference Short Bursts *Mystery Solved*
Post by: cessna157 on October 12, 2009, 12:18:26 AM

Sometimes, depending on the location of the receiver's antenna, you can hear the passage of the ARTS radar beam.  It can be heard as a chirp every 5-6 seconds or so.  I once flew over a nexrad radar dish and it had a much different, longer sound too.

Title: Re: Mystery Interference Short Bursts *Mystery Solved*
Post by: Unbeliever on October 15, 2009, 07:16:22 PM

Yeah, it's annoying when you've got Active Noise Reduction headsets and you are at a field with the surveillance radar on the field.  Every 5 seconds or so you get a little "yip-click" in the headset.   It gets really loud when you taxi right past the radar dish.

--Carlos V.