DIGITAL MOBILE RADIO “ITS NOT JUST A FAD”
DISCLAIMER • I am not an expert • I have been exploring this portion of our hobby for about 1 year…I learn something new everyday • I am not trying to steer you from your local analog repeater…..we need to use it more.
BACKGROUND • Developed in Europe-European Telecomm Standards Institute • Commercial standard for the past 20 years • Adopted by commercial business industry • Several OEMs entered into the Ham Radio market about 4 years ago
OVERVIEW • Digital vs. Analog • Analog-loses quality as signal decreases • Digital will remain clear until signal is lost • Bandwidth • 25 kHz versus 12.5 kHz • Uses Time Division Multiple Access (TDMA) • Splits 12.5 kHz into 2 time slots allowing for 2 conversations on same frequency at once • Talk Groups
Local DMR Repeaters • KC2CWT - Halifax Hospital • Frequency: 443.21250 • Offset: +5.000 • ColorCode: 1 • Time Slot #1 - Group Call 3 = N. America (ON) • Time Slot #1 - Group Call 1 =World Wide (PTT) • Time Slot #1 - Group Call 13 =WW English (PTT) • Time Slot #1- Group Call 3112 =Florida Statewide(PTT) • Time Slot #1 - Group Call 3174 =Southeast Regional (PTT) • Time Slot #1 - Group Call 310 =TAC-310 (PTT) • Time Slot #1 - Group Call 311 =TAC-311 (PTT) • Time Slot #2 - Group Call 2 =Local-NetWork (ON) • Time Slot #2 - Group Call 9= Local-Repeater (PTT) • Time Slot #2 - Group Call 3136 =TRI-State (PTT)
Local DMR Repeaters • KG4IDD - ESPANIOLA, Florida • Frequency: 443.40000 • Offset: +5.000 • ColorCode: 1 • Time Slot #1 - Group Call 3 = N. America (PTT) • Time Slot #1- Group Call 3112 =Florida Statewide(PTT) • Time Slot #1- Group Call 3113 =Florida Statewide(PTT) • Time Slot #1- Group Call 3174 =Florida Statewide(PTT) • Time Slot #1 - Group Call 31128 =Southeast Regional (PTT) • Time Slot #1 - Group Call 9= Local-Repeater (PTT) • Time Slot #2 - Group Call 2 =Local-NetWork (ON)
SPECTRUM MASTER SERVER DMR ID DMR ID LOCAL NETWORK Worldwide Server TALKGROUP Distribution (internet) TS 1 Regional Server internet (internet) LOCAL REPEATER 30ms time slice COLOR CODES DMR ID DMR ID TS 2 “pause” TALKGROUP Audio digitally processed
TALK GROUPS Local Examples TS-1 • Nearly 2000 talk groups Local Daytona Link • Local Florida State • State SE Florida SE REGION • Regional USA Area 4 • County TG 310 Treasure Coast • Special Interest TGIF HURRICANE NET NE FLORIDA ARES • STATIC vs DYNAMIC TS-2 PTT FIRST COAST Timeout
FIRST COAST DMR TG 31121 Other TG 31121 TG2 Atlanta Savannah TG 31121 Vadalia GA Exit 27 HOTSPOT SERVER Soon TG2 TG 31121 Waycross TG2 TG 31121 Kingsland JAX Beach Tampa JAX North Orange JAX Metro JAX West Park TG 31121 Check the repeater owner JAX South Configuration TG 31121 TG2 Espanola C-BRIDGE=LOCAL 2 TS 2 TG 31121 Disney Daytona BRANDMEISTER=31121 TS2 Orlando
NETWORKS 2589 repeaters 7929 Hotspots 44 Masters Configuration difference TG sharing Use of time slots TAC 310-312 SHARED TAC 313-319 NOT SHARED SOME BM SPECIFIC TG TO C-BRIDGE
HOTSPOT Single-Duplex Both Time Slots Repeater Like Multi-WiFi accessible Pi-Star Many Modes D-Star • DM • P25 • NXDN •
HT & Mobile Connect Systems PowerWerx Amazon North Georgia Comms Kenwood
CODE PLUG NAMING TO REPEATER TALKGROUPS 441.000 446.000 CC1 TS 1 ESP-TAC310 (TG310) 441.000 446.000 CC1 TS 2 ESP-LOCAL (TG2) REPEATER TX CRITERIA: CHANNEL FREE, CC, ALWAYS 12.5 kHz bandwidth CONFIGURATION CONFIGURATION CONFIGURATION CONFIGURATION CONFIGURATION ZONES CONTACT LISTS
HELP! http://www.dmrfordummies.com/ http://www.RadioID.Net http://firstcoastdmr.org/ http://dmr-marc.net/repeaters.html http://dmr-marc.net/media/DMR_MARC_Best_Practice_Guide_Rev_BB.pdf http://www.palsdmr.com/brandmeister-talkgroup-list/
Next-Social Gathering First Coast DMR “Meet & Greet” sponsored by FECA • Saturday, TBD • Awaiting attendees work schedule First Coast DMR
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