DMR: Introduction to a New D/V Mode for AMATEUR Radio. HamSCI Kai Chen, K2TRW
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1 DMR: Introduction to a New D/V Mode for AMATEUR Radio HamSCI Kai Chen, K2TRW
2 Presentation Summary
3 Digital Mobile Radio An ETSI published global standard Many manufacturers Longer battery life Supports multiple talk groups Supports DATA applications (IoT)
4 DMR Association Equipment Mfg Members
5 Intellectual Property Licensing
6 DMR Standards
7 DMR Standard DMR Tier II: Conventional Licensed conventional radio systems, mobiles and hand portables operating in PMR frequency bands 30 to 1000 MHz Targeted at users who need in licensed bands: Spectral efficiency; Advanced voice features; Integrated IP data services. Tier II Supports Tier I, not converse!
8 DMR Standards Public Access
9 DMR Main Characteristics 12,5 khz channel 9,6 kbps gross bit rate 4-FSK modulation (constant envelope) 2-slot TDMA channel Built around a 30 ms slot structure 50% duty cycle slot structure Forward and reverse transmission on a time division basis Voice, data or generic signaling Designed for frequency bands from 30 to 1000 MHz
10 Half the Channel Bandwidth 16K0F3E 7K60FXE f c f c f c 6.25 f c f c f c Traditional Analog 25 khz Channel Bandwidth 1 Channel 1 Repeater DMR 12.5 khz Channel Bandwidth 2 Channels 1 Repeater
11 More Spectrum Efficient than Older Digital Modes f c f c f c f c f c f c Guard Band as large as 10 khz between channels Total BW= 22.5 khz No Guard Band between 2 channels Total BW= 12.5 khz
12 ] TWO Repeaters in One! Lower infrastructure cost, 1 box in rack TWO voice/data channels from one repeater
13 Digital Voice CODECs D-STAR (Icom) GMSK/AMBE Vocoder P25 Phase 1 (Multi-Vendor) FDMA/IMBE Vocoder System Fusion (Yaesu) FDMA/C4FM/AMBE+2 Vocoder DMR (Multi-Vendor) 2-slot TDMA/AMBE+2 Vocoder Digital Voice CODEC Not Specified Flexibility for EXPERIMENTATION
14 Longer Battery Life Older Digital Modes (FDMA) DMR (TDMA) For each hour of usage the TDMA radios show between 19% and 34% less battery capacity is required than for the FDMA models. 40 percent improvement in talk time in comparison with analog radios
15 Better Speech Clarity No hiss/pop/static Forward Error Correction (FEC), Cyclic Redundancy Check (CRC) encoding Better RF range due to processing gain
16 S unit, dbm, milliwatt S dbm mw mv at 50 ohms S S S S S S S S S S
17 Better Audio Quality Listen for yourself. DMR does sound better than older digital technologies.
18 Better Performance DMR radios share basic processing, resulting in Better sensitivity/selectivity; Better spurious/intermodulation rejection; Better blocking; Better adjacent channel power; Better adjacent transient channel power. More rugged IP54/IP65/IP67 (dust tight/splash to immersion) Polite Access Blocks TX into existing QSO, override available
19 Substandard Terminals No FCC Certification Searchable on FCC Database? Support Tier I (Only) Radio-to-radio? Simultaneous Double Time Slot No sync, interferes with repeater Works with hotspot only Questionable Performance Bargain Price
20 Simultaneous Data/Voice Slot 1 Voice Slot 2 GPS Location (or second channel voice when not sending GPS data) Give your location WHILE talking!
21 Dynamic Mixed Mode Analog Analog OR Slot 1 TDMA Slot 1 TDMA Slot 2 TDMA Repeater dynamically detects the type of input IP site connect is supported on digital modes Slot 2 TDMA This is an option for a phased migration from analog to networked DMR repeaters.
22 IP Site Connect 1 or 2 slots (channels) Link statewide/regionwide systems Peer Peer Peer Master Bridging Hardware Master Peer Peer Master Peer
23 IP Site Connect A peer can participate with one or both time-slots Peers register with the Master Master keeps peers informed about other peers Master/Peers function as a fully meshed network for voice and data traffic If the Master fails, the fully mesh network continues to operate, but new peers can not join nor are changes announced A third-party bridge is used to interconnect IP Site Connect networks
24 Text Messaging Send to one person, or a group of people. - Weather Alerts - Club Meetings - Announcements
25 3100 Site network in 48 US States, 63 Countries ND(6) and SD(12) not [yet] deployed Also bridged to other Motorola Repeater-Based DMR networks 100% Pure Digital 82,000+ registered user IDs To register or learn more
26 DMR-Plus Network <100 Site network in the US and Europe Bridged to other Hytera repeater-based DMR networks 100% Pure Digital Allows interface to Motorola Repeaters (via R-pi & app) Allows data dongle into network - Shares user and repeater registration with DMR-MARC To register or learn more
27 BrandMeister Network Rival to DMR-MARC Bridged to other non-motorola DMR networks 100% Pure Digital Allows and supports Multi-Vendor DMR repeaters Allows APRS, texting, dongles, homebrew into network - Scanner-like monitoring via PC and Internet link Shares user and repeater registration with DMR-MARC This is the network to watch! To learn more
28 WW Networked Repeaters
29 BrandMeister Home Page
30 Bronx TRBO Repeater Map
31 NJ TRBO Repeater Map
32 Repeater Listing
33 Talkgroup Support DMR-MARC
34 BM Repeater Info 1
35 BM Repeater Info 2
36 Motorola CPS
37 Connect Systems CPS
38 BFDX CPS
39 Anytone CPS
40 DMR Commercial Radios
41 DMR Amateur HTs
42 DMR Amateur Mobile
43 K1MOT Hudson Site 145 and 447 MHz MotoTRBO 50 watt Repeaters on 1400 VA UPS Kohler 14 KW Auto-start Generator
44 MMDVM Amateur Repeater Controller
45
46
47 Some DMR Web Sites (check out the links at these web sites) (great general info) (need to join the group to access some links) (Brandmeister) (Independent Digital Network) (Listen In)
48 DMR: A NEW MODE FOR AMATEUR DIGITAL RADIO Spectrum Efficient! Supported by multiple manufacturers! Longer Battery Life! Resilient Networks (no internet needed) To learn more
49 Questions? Contact Kai Chen, Registration Reserve your DMR Identification Number For your next DMR radio KB Cubed LLC Authorized Connect Systems Value Added Reseller Barbara KD2JCK
50 Acknowledgement Thanks to Bill NE1B for key slides Thanks to DMR-MARC for starting network Thanks to NJ-TRBO Bob KC2CWT Thanks to the many amateur radio infrastructure operators whom have put in much of their time, money and effort into making DMR possible for radio (terminal) users THANK YOU FOR YOUR TIME AND ATTENTION
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