What is LTR trunking?
Logic Trunked Radio – Developed by EF Johnson/Transcrypt, it’s a somewhat popular trunking format that doesn’t rely on a specific control channel – all channels are used for voice and data transmissions. LTR is not APCO compliant due to lack of an emergency/man down function and no RID (Radio ID) feature (no way to uniquely identify an individual radio), and therefore is not normally used for public safety agencies (there are some exceptions, though). 2.7 – What is MPT-1327/MPT-1343 A trunking system used primarily in Europe (MPT was developed by the British Ministry of Post and Telecommunications). It is a popular, open protocol trunked radio system that supports analog voice communications. MPT 1327/1343 does not have a separate control channel. The TTC uses MPT-1327 for their subway radio network. MPT-1327/1343 systems cannot be tracked with any known scanner model. MPT-1327/1343 systems can be tracked using the TrunkSniffer or FTrunk programs.
