Audio Samples

There are a lot of weird and unusual sounds that you may hear while scanning. This page will not carry the common sounds you may hear on a regular basis like Motorola Control Channels or EDACS Control Channels but will carry the weird and unusual sounds that are not so common known. If you are interested in hearing what common sounds you may hear while scanning I suggest you check out Digital Modes Samples or W2SJW Radio Sounds. If you can identify any of the sounds listed or have a sample to add please let me know. All the sounds are saved in MP3 (56Kbit/sec-44,100 Hz Mono) format.

Type Of Sample	Frequency	Tone	Description
Unknown Data	151.6700	CSQ	A lot of taxi companies as well as other companies use this type of data for their terminals in their vehicles. You will find this type of data all over the VHF and UHF band. The exact format or type of data though is unknown to me.
Unknown Data Keyups	417.6000	PL 114.8	This frequency belongs to the United States Postal Service Postal Inspectors in the Dallas-Fort Worth area which in the past I have heard regular analog voice on it. Now if I remember correctly this is a repeater but from this recording it sounds like something was continously kecrunking it.
Unknown Buzzing Tone	451.1000	PL 165.5	This one the best I can describe as a constant buzzing data tone. For the most part the tone is constanst but every so often there is a kerchunk of what could be best described as data being sent.
Unknown Data Keyups	451.2625	CSQ	This can be described as some type of rapid data keyups. The data keyups look like they have an on and off pattern that stays pretty constant except the sound of the data bursts change from time to time.
Unknown Data	452.8500	CSQ	Another example of the data found on 151.6700 but this one in the UHF band. A lot of taxi companies as well as other companies use this type of data for their terminals in their vehicles. The exact format or type of data though is unknown to me.
Unknown Constant Tone	454.7250	CSQ	The frequencies between 454.6750 and 464.9500 belong to the Airphone service. These are Air-To-Ground Telephones found in private aircraft. Ground stations across the US are assigned a channel number which you may find this tone. When the ground station is not in use you will hear this continous tone as I have in my audio sample.
Unknown Idle Marker	935.9875	CSQ	Not sure who this belongs to but I am pretty sure that this is some type of idle channel marker. This idle marker tone never changes and can be heard mainly during the nightime and not during the daytime.