Also known as: MPT 1327, MPT-1327, MPT1327

MPT 1327 is an analog trunked-radio signalling standard that originated in the United Kingdom. It uses a dedicated control channel carrying 1200 bps FFSK data to manage analog FM voice channels, and became a common international trunking standard.¹

MPT 1327 uses an FFSK control channel to manage analog FM voice channels.

Overview

MPT 1327 defines the control-channel signalling (call requests, grants, and identities) while voice remains analog FM on assigned channels. It was a widely adopted open alternative to proprietary systems like Motorola Type II.

Technical characteristics

Property	Value
Access	FDMA
Control signalling	1200 bps FFSK
Voice	Analog FM

History

Published in the UK in the 1980s; deployed across Europe, Asia, Africa, and Australasia for commercial and government trunking.¹

Deployment

Business, transport, and government fleets internationally; declining as digital standards take over.

Decoding it with GopherTrunk

See Status for GopherTrunk’s MPT 1327 control-channel support.

Sources

1. MPT-1327 — Wikipedia, for the UK-originated analog trunking signalling standard, its FFSK control channel, and international adoption. ↩ ↩²

See also

• Trunked radio
• Control channel
• FFSK
• LTR (Logic Trunked Radio)
• EDACS

Learn it step by step

• The digital protocol landscape

From the blog

• SDR Internals, Part 10: Protocol decoders & state machines