Good morning, everyone!
Once upon a time, there was a thread in this forum relating to unknown P25 traffic on 408.0000 in Omaha.
After listening for the past few days, it's clear that this is being used by VA Hospital Security Police. In fact, they have a phone patch connected to the system where people who have received tickets can contact the Police to arrange payment, court dates, etc.
If it's one thing that P25 really doesn't seem to pass well, it's DTMF and single-frequency tones. When the phone patch comes up, it emits a long ~1KHz. tone, whose sound improves over its 10-second interval. However, at the end of the call, the Officer taking the call uses DTMF tones to knock the phone patch down and from the sound of those tones, it's a wonder that they can be used to control anything!
73's
Once upon a time, there was a thread in this forum relating to unknown P25 traffic on 408.0000 in Omaha.
After listening for the past few days, it's clear that this is being used by VA Hospital Security Police. In fact, they have a phone patch connected to the system where people who have received tickets can contact the Police to arrange payment, court dates, etc.
If it's one thing that P25 really doesn't seem to pass well, it's DTMF and single-frequency tones. When the phone patch comes up, it emits a long ~1KHz. tone, whose sound improves over its 10-second interval. However, at the end of the call, the Officer taking the call uses DTMF tones to knock the phone patch down and from the sound of those tones, it's a wonder that they can be used to control anything!
73's