CHIRP

NOAA uses a 1050 Hz tone, not a "105.0 Hz" tone.

This is also not CTCSS at all, for that it would need to be 1. sub-audible and 2. continuous (!) under the transmission. The NOAA is alert tone is 10s, and then stops. You would only hear the tone and then your scanner will cut out.

Your request barely makes sense. I am not aware of any two-way radio supported by CHIRP implementing the "Public Alert" feature. And even if there was, this would be a simple on/off with a fixed frequency, not a "custom" non-CTCSS tone.

Okay, thanks.

I have my nicFW on my TD-H3 radios, which is running this feature as 105.0
as a CTCSS rToneFreq.

I didn't realize that since that is a custom firmware, it was converted
that to listen for the 1050 code, and then lock squelch open.

I apologize for offending anyone with my lack of knowledge in this matter.

For what it's worth, that feature was instrumental in giving us early
warning for one of the Georgia tornado warnings last month, while away from
our NOAA radio and before the warning sirens were activated.

Thanks again,¶

FerrelW

On Thu, Apr 24, 2025, 06:59 Eiben Scrood redmine@chirpmyradio.com wrote:

Yes, and higher-quality radios (like Kenwood) support a dual-watch WX alert function where they will switch to that channel when they here the 1050. Especially if you're using it for life-safety stuff, I'd recommend something better suited for it :)