The repeaters are linked using Asterisk/app_rpt which is an open source PBX/RoIP integration software. Several devices are available, the two I am familiar with are the URIx and the RTCM. MWGMRS uses the RTCM as it is the most stable and only requires a single central controller running Linux and the Asterisk/app_rpt software.
Simply put, the RTCM is integrated into the repeater and configured to connect over the internet to the central server. Once connected commands can be issued to connect to other repeater on the central server or an external network like the
myGMRS network that we are part of.
Some basic knowledge of your repeater and how it interfaces to an external controller is a must. None of this is plug and play but easy to complete with basic radio and computer knowledge.
A: A repeater, feed line, antenna, etc (the physical radio system)
B: A computer running Debian Linux or another distro with a correctly installed version of Asterisk/app_rpt (We use Intel servers by Dell)
C: A URIx interface unit (from DMK) and the correct cable to connect the URIx to your repeater/radios (we use cables from Northcomm Technologies) OR
D: An RTCM from Micro-node international and a cable to connect the repeater to the RTCM. (we use cables from Northcomm Technologies)
E: A little configuration of the software to set up the links between repeaters.
It sounds daunting, but for the most part it’s a very simple process. If you rather just have everything but the interfacing to your repeater done you can purchase a repeater linking setup from myGMRS. This get you the raspberry Pi already programmed, a radio interface of your choice and access to the myGMRS network. From here you can link several systems together or ask to link to another system already on the network. For more information on purchasing a linking bundle visit the myGMRS shop.