Multimode Digital Voice Repeater
GB7JM was first licensed on 14th
October 2016, and pressed into service shortly after.
The repeater system comprises:-
2 x Tait T800 RF Modules, TX running at 10Watts. MMDVM Modem is the STM32DV
Raspberry PI computer running MMDVM under Pi-Star Antenna is a Diamond X50 (later to be upgraded).
Duplexer supplied by J-Nuoda from China. Network Brandmeister (Ireland Server)
Photographs of complete system
GB7JM Nextion display (D-Star active)
GB7JM complete internal view
GB7JM STM32DV modem attached to Raspberry Pi3
Tait T800 series TX Module
TAIT T800 series RX Module
The repeater is setup as follows.
TX = 430.8875mhz (users rx frequency)
RX= 438.4875mhz (users tx frequency)
DMR Colour code 3.
GB7JM uses talk groups only
Time slot 1 TG9 Local
Time slot 2 Static TG’s, 2350 UK wide and 2351 chat 1.
Both time slots can use “user activated talk groups”,
these will time out after aprox 20 minutes of no RF activity.
D-Star follow usual D-star configuration.
Fusion not activated (contact me if required)
GB7JM Is dedicated to my best friend Jakey Matthews, I miss him dearly,
he was a loyal, loving beautiful soul. Jake I will never forget you, I will always love you.