dmr: a new mode for amateur digital radio
TRANSCRIPT
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!
0
5000
10000
15000
20000
25000
30000
JAN-09
APR-09
JUL-09
OCT-09
JAN-10
APR-10
JUL-10
OCT-10
JAN-11
APR-11
JUL-11
OCT-11
JAN-12
APR-12
JUL-12
OCT-12
JAN-13
APR-13
JUL-13
OCT-13
JAN-14
APR-14
JUL-14
OCT-14
JAN-15
APR-15
JUL-15
OCT-15
JAN-16
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,[email protected]
� Orhttp://dmr-marc.net/contact.html