DIGITAL MOBILE RADIO THE VERY BASICS
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1 DIGITAL MOBILE RADIO THE VERY BASICS
2 The DMR Difference History Audio Quality Spectrum Efficiency The Local and Worldwide Network Repeater vs. Hotspot Code Plugs DMR today in our area
3 Brief History DMR developed in Europe by ETSI European Telecomm Standards Inst Adopted as Commercial Standard 20 years ago Commercial Business Equipment Proprietary Equipment and Software High Cost Not ham radio friendly Ham Radio Equipment (2 years ago) Field Programmable Ham Friendly
4 Ham Friendly TYT MD-380 Motorola xpr7550 Single Band Single Band < $100 vs $500-$700 Anytone D868 Ailunce HD1 TID TD-9800 Dual Band Dual Band Single Band Features & Audio
5 Audio Quality Digital vs Analog TDMA
6 Spectrum Efficiency Analog FM = 25 khz DMR (TDMA) = 12.5 khz Tier I European License Free Band (not ham) Tier II TDMA Commercial & Ham Standard
7 Time Slots Much like a Duplex House Two totally separate families in one structure. Time Slot 1 Time Slot 2 Each house has its own set of rooms Talk Groups
8 Talk Groups TG Time Slot Local 2 Local Cluster of Repeaters 2 Local 9 Main Repeater Only 9 TAC 310, 311 Secondary Chat Groups 310, 311 Nationwide National Calling Channel 3100 PA TAC Local Cluster of Repeaters PA State PA Statewide 3142 MD State MD Statewide 3124 NE Reg l Northeast Regional 3172 Mid Atlantic Mid Atlantic Region 3173 Over 1100 Talk Group Possibilities ^
9 Talk Groups TG Time Slot Local 2 Local Cluster of Repeaters 2 2 Local 9 Main Repeater Only 9 2 TAC 310, 311 Secondary Chat Groups 310, Nationwide National Calling Channel PA TAC Local Cluster of Repeaters PA State PA Statewide MD State MD Statewide NE Reg l Northeast Regional Mid Atlantic Mid Atlantic Region FT / PTT
10 Talk Groups TG Time Slot Local 2 Local Cluster of Repeaters 2 2 FT Local 9 Main Repeater Only 9 2 FT TAC 310, 311 Secondary Chat Groups 310, PTT Nationwide National Calling Channel PTT PA TAC Local Cluster of Repeaters PTT PA State PA Statewide FT MD State MD Statewide FT NE Reg l Northeast Regional FT Mid Atlantic Mid Atlantic Region FT
11 Sample Repeater Configuration
12 Local 2
13 Local 2
14 Local / Worldwide Network MHz MHz DMR Repeater Stand Alone System (Shrewsbury) (Keystone) Can be IP Networked with c-bridge
15 Local Network
16 National / World Wide Networks DMR Marc/Brandmeister
17 Networks Repeaters Direct Connect TG Compatibility
18 Networks Local 2 (Rpt) Local 9 (Rpt) PA TAC <---> PA TAC 310, 311, 312 <---> 310, 311, > 319 x 313 > 319 State Groups <---> State Groups Regional Groups x n/a Nationwide 3100 <---> Nationwide 3100 Repeat vs Hotspot
19 Repeater vs. Hotspot Repeater s provide both Local and WW area coverage Hotspot Replaces a Repeater Very short range Brandmeister But Why?
20 Why use a Hotspot? No nearby repeaters Heavy traveling Long Conversations So, where s the activity?
21 1100 Talk Groups Your Choice
22 Activity Levels TG Activity Local 2 Local Cluster of Repeaters 2 Low FT Local 9 Main Repeater Only 9 Low FT SPA Local Keystone & Shrewsbury only Low FT PA TAC Local Cluster of Repeaters Low PTT PA State PA Statewide 3142 Med FT MD State MD Statewide 3124 Med FT NE Reg l Northeast Regional 3172 Med FT Mid Atlantic Mid Atlantic 3173 Med FT TAC 310, 311 Secondary Chat Groups 310, 311 High PTT Nationwide National Calling Channel 3100 High PTT Op Notes
23 Operating Notes 3 second pause before PTT Network Latency Courtesy Pause 1 second pause after PTT Channel Busy Radio needs to sync to DMR signal Time Slot in use Green Light Time Slot busy tone Someone on same TS but different TG Talk Group in use You may not immediately hear an active Talk Group
24 Operating Notes Avoid Calling CQ This is not HF. There is no DX, WAS, etc. Announce your talk group Scanning or radio without a display Avoid long QSOs on wide area talk groups Please move to a TAC channel Time Slots Each Time Slot will only support one QSO at a time. regardless of the number of talk groups available. Dash Boards
25 Dashboards Netwatch Watch the DMR Network activity Real Time Hoseline Listen to Brandmeister Talk Groups Real Time
26 Netwatch
27 Hoseline
28 Dashboard Links Netwatch Hoseline Miklor.com K3NXU.com (DMR Section)
29 Reference
30 Code Plug FM DMR Frequency / CTCSS Frequency / Color Code Three Main Divisions (1) Contact List (Talk Groups) (2) Create the Channel Information (3) Group the Channels into Zones
31 Code Plug Step 1 - The Contact List aka Talk Groups This is where the Talk Groups are stored. - Talk Group Name - Talk Group Number - Group or Private (Select Group)
32 Code Plug Step 1 - The Contact List aka Talk Groups
33 Code Plug Step 2 - The Channel Information Frequency Rx and Tx Color Code 1 Channel Spacing 12.5 khz Time Slot Whatever was specified for the repeater Tx Contact Talk Group from Contact List Rx Contact None will default to the Tx Contact Power High or Low Tx Criteria Always, Color Code, Channel Free Scan List Optional
34 Code Plug Step 2 - The Channel Information
35 Code Plug Step 3 - The Zone This is where you assign your favorite channels to customized channel blocks. Group channels by convenience: Repeater - Shrewsbury / Keystone / Harrisburg Activity - Favorite or Most used Talk Groups Travel Group Local 2 Shrewsbury Simplex - > Local 2 Keystone Local 2 Harrisburg
36 Code Plug Step 3 - The Zone
37 Code Plug Step 4 - Scan Groups This is where you create a group of receive channels that you would like to Scan. Assign the Scan Group to a specific channel.
38 Code Plug Step 4 - Scan Groups MD / PA
39 Code Plug Step 4 Scan Groups
40 MD, PA Cluster May 2016 May Registered DMR IDs 333 in PA Registered DMR IDs 1400 in PA 600 in MD 100 in DE
41 DMR in the USA
42 DMR in the Mid-Atlantic
43 MD, PA Clusters (Local 2) V = VHF U = UHF * = Limited Coverage ** = Coming Soon
44 MD, PA Clusters
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