DMR:ANEWMODEFORAMATEURDIGITALRADIO

Slides for Nashua Area Radio Club Feb. 2, 2016 By Bill Barber, NE1B

DigitalMobileRadio� An ETSI published worldwide standard � Over a DOZEN manufacturers of radios

(Connect Sysems,Tytera, Vertex, Motorola, Kenwood and Alinco)

� Superior voice quality (AMBE+2) vs older digital modes (AMBE, IMBE, GMSK)

�  Longer battery life! Automatic Roaming! � Supports multiple talk groups on one freq. � Supports data applications (txt,email,gps)

DMRAssocia<onEquipmentMfgMembers

DMRStandard-ETSITS102361�  Tier1(Unlicensed)

�  FDMA,Consumerapplications,.5watt�  dPMR(446MHzEuropeanunlicensedservice)

�  Tier2(Conventional)�  2-slotTDMA�  IPSiteConnect(Vendorspecific)

�  Tier3(Trunked)�  2-slotTDMA�  Multi-channel,Multi-Site

AmateurDigitalVoiceSystems�  D-STAR(Icom)

�  GMSK/AMBEVocoder�  P25Phase1(Multi-Vendor)

�  FDMA/IMBEVocoder�  P25Phase2(Multi-Vendor)

�  2-slotTDMA/AMBE+2Vocoder�  SystemFusion(Yaesu)

�  FDMA/C4FM/AMBE+2Vocoder�  DMR(Multi-Vendor)

�  2-slotTDMA/AMBE+2Vocoder

TWORepeatersinOne!�  ]

Lower infrastructure cost, 1 box in rack TWO voice/data channels from one repeater

HalftheChannelBandwidth

Traditional Analog 25 kHz

Channel Bandwidth

1 Channel 1 Repeater

DMR 12.5 kHz

Channel Bandwidth

2 Channels 1 Repeater

fc fc fc + 12.5 fc - 12.5 fc – 6.25 fc + 6.25

16K0F3E 7K60FXE

MoreSpectrumEfficientthanOlderDigitalModes

No Guard Band between 2 channels

Total BW= 12.5 kHz

fc fc + 11.25 fc – 11.25 fc + 6.25 fc fc - 6.25

Guard Band as large as 10 kHz between channels

Total BW= 22.5 kHz

BeTerSignalQuality�  No hiss, popping,

or static �  Better RF range

than older digital technologies

�  Forward Error Correction and Cyclic Redundancy Check coders

BeTerAudioQuality�  Listen for yourself. DMR does sound better

than older digital technologies.

LongerBaTeryLife

“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 “

http://dmrassociation.org

DMR (TDMA)

Older Digital Modes (FDMA)

DataandVoiceattheSameTime

Slot 1 Voice

Slot 2 GPS Location (or second channel voice when not sending GPS data)

Give your location WHILE talking!

IPSiteConnect1or2slots(channels)

Bridging Hardware

Master Master

Master

Peer

Peer

Peer Peer

Peer

Peer

Link statewide/regionwide systems

IPSiteConnect�  Apeercanparticipatewithoneorbothtime-slots�  PeersregisterwiththeMaster�  Masterkeepspeersinformedaboutotherpeers�  Master/Peersfunctionasafullymeshednetworkfor

voiceanddatatraffic�  IftheMasterfails,thefullmeshnetworkcontinuesto

operate,butnewpeerscannotjoinnorarechangesannounced

�  Athird-partybridge(c-BridgeorSmartPTT)isusedtointerconnectIPSiteConnectnetworks

c-Bridges�  Links master repeaters (groups of 15-20),

and bridges � Mfrs: Rayfield Communications, TL-Net � Provides arbritration. If two users key up

simultaneously, one gets denied and immediately is notified to prevent dual transmissions.

DynamicMixedMode:Firstin–FirstOut

OR

Analog Analog

Slot 1 TDMA

Slot 2 TDMA

Slot 1 TDMA

Slot 2 TDMA Repeater dynamically detects the type of input IP site connect is supported on digital modes

This is an option for a phased migration from analog to networked DMR repeaters.

FreeTextMessaging

Send to one person, or a group of people. - Weather Alerts - Club Meetings - Announcements

�  Motorola Amateur Radio Clubs and other private repeater owners

�  500+ site network in 47countries �  Also bridged to other networks DCI, NorCal, AZ, NC, MI,

KS, CO and Texas DMR networks �  100% Pure Digital �  More than 24,000 registered users �  To register or learn more http://dmr-marc.net

DMR-MARC Networked Repeaters

(use group call ID 1 on slot 1) Click on city for coverage maps. green=portable and blue=mobile

Go to Google Networks Map

LocalDMRRepeaters�  NH–HudsonK1MOT145.26�  NH-HudsonK1MOT447.725�  NH–DerryK1QVC145.31�  NH-ChesterK1OX145.19�  NH-ManchesterW1RCF145.22�  NH-GoffstownN1PA145.20�  NH-BowK1OX145.17�  MA–ChelmsfordN1IW145.18�  MA–ActonNO1A146.42�  MA-SouthboroAE1C145.270

NewEnglandandMari<mes�  RecentNetworkExpansions

�  Fredericton,NB�  Moncton,NB�  St.John,NB�  Calais,ME�  Bangor,ME�  Augusta,ME�  Mt.Ascutney,VT�  PicoPeak,VT

Moresiteswelcome!

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AmateurDMRGrowthby#RadioIDs

AmateurDMRisTrending�  Jan2013=2511Users�  Jan2014=4618Users�  Jan2015=9802Users�  Jan2016=24,388Users

Thispastyear,a149%increase.Primarilyfueledbythecompetitionamongradiomanufacturersandfeaturesoffered.

CustomerProgrammingSW

XPR4550Mobile

MD782mobile

DMRRadios

SL+XPR7550Portables

PD782portable

MTR-3000100w.Repeater

XPR-840050w.Repeater

K1MOTHudsonSite145and447MHzMotoTRBO•  50wattRepeaterson•  1400VAUPS•  Kohler14KWAuto-start

Generator

TaitTB9300DMRRepeaterDual 50W Repeaters Dual 100W Repeater 1000 Channels; uses modules of TB9100 for P25 to DMR conversion! Should support Conventional DMR (Tier2) in 2nd firmware revision!

HamFriendlyDealers� Sandy’s Comm., contact Jeff,

866.993.9011 �  TwoWayDigitalRadio.com, contact Ken

706.896.0000 � Connect Systems http://csi-radios.com/ � E-Bay or Local Dealers TRBO DMR radios are DMR–and-Analog monoband

SomeDMRWebSites(checkoutthelinksbelow)

� http://dmr-marc.net/(WWNet)� http://nedecn.org(NewEngland)

DMR:ANEWMODEFORAMATEURDIGITALRADIO

�  Spectrum Efficient ! �  Supported by multiple manufacturers! �  Automatic Roaming for Safe Driving! �  Longer Battery Life! �  3 Year Warrantees on many radios �  Resilient Networks (no servers needed at sites) �  To learn more http://dmr-marc.net

Ques<ons?� ContactBillBarber,ne1b@arrl.net

� Orhttp://dmr-marc.net/contact.html