What is this noise on 345.000?

[brandon]

I have been hearing this strange noise on 345.000 that sounds like a woodpecker/knocking sound. I first thought it was some local noise, but I'm picking this up from both San Diego and Riverside County (about 90 miles distance), so it must be something else. This freq is used by USCG aircraft --- could this be some type of signalling data mode?

Here is a record: http://cl.ly/MfI2/345.0000.mp3

 

[Tech792]

I get the same thing here on the east coast at times. I've also heard it in the background when helos were up my way doing training out over the water so its probably coming from a helo. Almost sounds like a machine gun at times.

 

[Rt169Radio]

Sounds like a digital data transmisson, how long does the noise stay for?

 

[gvranchosbill]

Here is some Low Power devices and freqs.

315.000 MHz for North American made cars.
Remote keyless System (RKS)
Remote Keyless Entry Systems (RKE)
Remote keyless Ignition System (RKI)

345.000 MHz ADT Home Security System (Machine Gun Sound)

433.920 MHz for European,Japanese and Asian cars.
Remote keyless System (RKS)
Remote Keyless Entry Systems (RKE)
Remote keyless Ignition System (RKI)

Wireless Door Bell SHUNDA
284.4000 MHz Door Bell
225.5000 MHz Chime

Car Alarm SEGA SE-600 Key Fob
301.3200 MHz Alarm Rx module

Car Alarm MICRO Key Fob
301.6700 MHz Alarm Rx module

Air Conditioning WOOKEE Key Fob
304.5000 MHz Unknown

Keyless Entry System UNBRANDED' Key Fob
310.0000 MHz Alarm Rx module

Wireless Door Bell QUSUN
313.8477 MHz Door Bell
313.8477 MHz Chime

Car Alarm CA 850 Key Fob
360.2200 MHz Alarm Rx module
356.7130 MHz

 

[ColoradoRedlands]

Great list Bill. Do you any info on similar systems in other bands?

 

[brandon]

Thanks Bill. ADT Home Security. Makes perfect sense and is exactly what I'm hearing (i.e machine gun sound)