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Understanding DMR Networks
Presentation By:Jason Johnston – KC5HWB
www.DMRTexas.net
www.LiveFromTheHamshack.tv
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Ham Radio 2.0
www.livefromthehamshack.tv
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DMR – Digital Mobile Radio
www.DMRTexas.net
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Different Networks● DMR-MARC
– First in USA
– Uses C-Bridges
● Brandmeister– Master Server
– Allows Hotspots
– Some Talkgroups inter-connected
● DMR+– Connects DV4Mini USB Hotspots to
DMR-MARC Network
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Which One Is Better ??
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History of DMR in USA● Ratified in 2005 by the European Telecommunications Standard Institute
● March 2009: Paul K6EH was operating a UHF TRBO repeater in standalone digital mode from Hollywood Hills in Los Angeles county, California in 2008. This site has a very wide area coverage location and spured our initial interest in DMR. It is likely that Paul's repeater (DMM actually long before DMM was included in the MotoTRBO firmware) was the very first Ham TRBO repeater in the USA and this was well before IPSC was provided by Motorola.
● June 27, 2009: On this Saturday morning we had our first IPSC connection. The repeaters were located in Mt Pleasant IA (Randy WB0VHB), Culver City CA (Ray WA6NVL, master repeater) and Costa Mesa CA (Mike WB6WUI; now NO7RF). We successfully connected the 3 repeaters and were up and chatting on the "All Call" talkgroup, using the new repeater firmware R01.04.09 (6500's running R01.04.01). All three repeaters were sitting on the desks and all 3 repeaters were the original R01.xx demo repeaters that had been sitting on the dealer shelves for several years.
● Full history at http://www.trbo.org/history.html
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History of DMR in USA, Page 2● At the 2009 Dayton Hamvention, Jim Hopper
(W5EBQ) and Paul Alred (W5PCA) had a meeting with the DMR-MARC folks and decided to setup the first Cbridge in Texas, named Lonestar
● Brandmeister started in 2015
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DMR Networks● DMR-MARC
● DCI TRBO
● Lonestar
● DMRX
● K4USD
● Crossroads
● Chicagoland
● Rocky Mountain Ham
● DMR-FL
● Bronx TRBO
● Brandmeister
● DMR+
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C-Bridge ConfigurationDMR-MARC
WorldwideN. America
WW EnglishRegionals
Lonestar- Texas 3148
DCI- TAC310- TAC311- TAC312
Cbridge 2.0
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C-Bridge ConfigurationDMR-MARC
WorldwideN. America
WW EnglishRegionals
Lonestar- Texas 3148
DCI- TAC310- TAC311- TAC312
Cbridge 2.0
+1000 Talkgroups
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C-Bridge – more than DMR
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DMR-MARC =/= C-Bridge
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C-Bridge Netwatch
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Brandmeister Dashboard
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Brandmeister Hoseline
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Hoseline Access● Monitored by everyone● Passes audio● Can connect to talkgroups from hotspots
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C-Bridge and Brandmeister
C-Bridges● Originate Talkgroups
● Anyone can own
● Pass Talkgroups from other C-Bridges
● Pass Talkgroups from Brandmeister
● Repeater and Hotspot Access
Brandmeister● Originate Talkgroups
● Master Server – Owned by Brandmeister
● Pass Talkgroups from Brandmeister
● Repeater and Hotspot Access
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Strengths
C-Bridge● More customizible ● Private talkgroups easier● Multiple networks● Mostly repeaters
Brandmeister● More uniform● Easier Hotspot setup● Repeater Owner (Sysop)
access to Dashboard● APRS enabled
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More Info● Video series on Ham Radio 2.0
– www.LiveFromTheHamshack.tv