[TheList] Squawking Tones on Police Channel & High Frequency Tone on Channel

Sun Mar 20 09:23:28 AEDT 2022

Those tones are something to do with the linking with all the VTGs.

They happen every 4 hours at midnight and so on.

Someone will no doubt give a more technical explanation of them soon.

On Sun, 20 Mar 2022, 11:01 BJ, <bjcuizon151 at gmail.com> wrote:

> Hi all,
>
> Was in Dunedin recently and tuned in to police comms. Anyone know what
> those squawking tones on some police channels are? It doesn't sound like
> fire selcall but more like a really short (~1 sec) burst of what sort of
> sounds like a part of the old dial-up handshake.
>
> Also, was listening to firecom and ambo thru the I-band link in Chch and
> on some link channels there is a really high pitched tone that is present
> when someone keys up. It can only be heard on a radio with no audio
> filtering/DSP as my Tait seems to cancel it out. Does anyone have an idea
> what this is as well?
>
> Thanks in advance,
> BJ
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