Strange tone after transmission

Hello everyone,

While scanning some local departments here (Turkey), i have recorded strange tone at the end of transmissions.

Tone is always there after end of transmission.

There are 7 different tones i have recorded so far.

May you take a look to attachment?

Or you can listen it online: beeps



Any ideas?

Thank you all.

Attached Files

beeps.zip (112.1 KB)

Strange tone after transmission