MPT 1327

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MPT 1327
MPT1327 waterfall.png
Frequencies 176.5 MHz,184.5 MHz,201.5 MHz,162.5 MHz,207.5 MHz,420 MHz,800 MHz,461 MHz
Frequency Range 162.5 MHz - 800 MHz
Mode NFM
Modulation FM,FFSK
ACF 106.66 ms
Emission Designator
Bandwidth 10 kHz,25 kHz,20 kHz,12.5 kHz
Location Worldwide
Short Description MPT1327 (Ministry of Posts and Telegraph 1327) is a signaling protocol standard for analog trunked radio
I/Q Raw Recording Download file
Audio Sample

MPT 1327 (Ministry of Posts and Telegraph 1327) is a signaling protocol standard for analog trunked radio. It was developed in 1988 by the British Department of Trade and Industry (DTI).

This mode is primarily used in the United Kingdom, Europe, South Africa, Australia, and New Zealand.

The trunking control channel is used to communicate between the mobile radios and the network at 1200 bits per second with fast Frequency Shift Keying (FFSKFast Frequency-Shift Keying) subcarrier modulation. Since this is an analog mode, voice traffic is sent with analog FMFrequency Modulation, so it can easily be monitored with a simple FMFrequency Modulation receiver.


Control Channel[edit]

Mobile Packets[edit]

MPT1327 Establish Link
MPT1327 Mark end of individual transmission
MPT1327 Terminate Link

Recordings of MPT1327 Voice Comms[edit]

You can hear the above 3 MPT 1327 mobile packets in these recordings of MPT1327 voice traffic. At the beginning of each radio-to-radio link there is a Mobile call packet to establish a link. Then, during this link, as each person talks, each time they key off their radio the MPT1327 Mark packet marks the end of the individual transmission (not the end of the entire link; the FMFrequency Modulation carrier is still there). When the link is done, a long Terminate Link packet will be heard, after which the FMFrequency Modulation carrier will stop and the link considered terminated.

Recorded from Riga, Latvia on May 1st, 2010 at 423.6 MHzMegaHertz (MHz) 10^6 Hz.

Additional Samples[edit]

Mobile, calling
Mobile, closing


In the UK, seen in sub bands 176.5-184.5 MHzMegaHertz (MHz) 10^6 Hz, and 201.5-207.5 MHzMegaHertz (MHz) 10^6 Hz. Also sometimes seen around 162.5 MHzMegaHertz (MHz) 10^6 Hz. Commonly seen at 420-440 MHzMegaHertz (MHz) 10^6 Hz, and in the 800 MHzMegaHertz (MHz) 10^6 Hz band.

Decoding Software[edit]

Hobby Level Software
Professional Software

Decoding Tutorials[edit]

Video Examples[edit]

Additional Links[edit]

Additional Images[edit]