How do the courtesty tones work?

There are many telemetry tones used on the WIN System, and they all have a purpose.

• When you (or someone else) keys up your local repeater you will normally hear a two-tone "Be-Bop" (high pitch tone followed by a low pitch tone) as a courtesy tone, about two seconds after the un-key.  This telemetry tells you that you are making your local repeater.
  
  
• As in above, when you hear the "Be-Bop" courtesy tone after someone else un-keys, you know the source was the same repeater in the InterTie System that you are listening to.
  
  
• When you hear no telemetry tones at all after a signal un-keys, you know that the signal originated somewhere else (another repeater, or a Remote Base down the Link) in the InterTied System, and not from the repeater you are listening to, or the signal originated from a Remote Base on the repeater you are listening to if your repeater has a Remote Base. On Remote Basess, notice the squelch tail on the Remote Base signal. On the WIN System repeaters, you usually don’t hear a squelch tail.