Decatur MPT ?

[jack3726]

From what I can tell Decatur is MPT with 4 Freqs. I put in 453.8625 and can hear traffic with some strange garbble at the end like a small burst but doesn't really effect the TX that much, my question is, what would allow this to happen.

 

[crayon]

From what I can tell Decatur is MPT with 4 Freqs.

MPT as in MTP-1327?

 

[SCPD]

yes.

 

[nd5y]

The Decatur MPT-1327 trunked system makes a short data burst on the
voice channels right before the carrier drops out.
It sounds to me like it is some type of turn off code that sends the radios
back to the control channel, similar to the way other trunking formats
work. Maybe it is something else. I don't know very much about MPT-1327

Tom

 

[jack3726]

I guess I was wondering more of how I could be hearing these freq's. I thought you had to have a specific scanner cabable of monitoring MPT, maybe I am wrong. There are 4 MPT freqs for Decatur, I can hear traffic on 3 of them with the burst at the end, the other freq is just loud noises.

 

[nd5y]

Yes you can hear the voice channels on any scanner. They are regular
analog FM but you can't trunk track the talkgroups. The channel with the
"noise" is the control channel.

Tom

 

[jack3726]

Thanks ND5Y, just another ?, with a 4 channel system for a small PD dept and the one warbler channel that leaves 3 left to hear, I don't think I will miss much, actually sometimes the conversations stay on the same channel, maybe they have a wierd MPT setup, seems one channel is dispatch and the other LEIN.