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D Star Digital Data (DD) Buddy Morgan WB4OMG Trustee KJ4ACN D Star Repeater, Lakeland, FL

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Presentation on theme: "D Star Digital Data (DD) Buddy Morgan WB4OMG Trustee KJ4ACN D Star Repeater, Lakeland, FL"— Presentation transcript:



3 D Star Digital Data (DD) Buddy Morgan WB4OMG Trustee KJ4ACN D Star Repeater, Lakeland, FL

4 D Star Digital Data An additional mode only available on an ID-1 Allows any Ethernet formatted Data to be communicated Wireless Access Point: Greater range, but slower speed than Part 15 devices 128Kbps (130 KHz bandwidth) Simplex, Forward Error Correction only, Latency problems

5 ID-1 First Unique Radio manufactured for Amateur Service, since 1957 23 cm band (1296 MHz or 1.2 GHz) operation, only FM Voice Digital Voice Slow Speed Data 128 Kbps Data (Ethernet Port)

6 My Points: The RF aspects of successful 23 cm operation Digital Voice on 23 cm Digital Data Simplex Internet access using two ID-1s Internet access using a DD "repeater" Future of D Star Digital Data (DD)

7 The RF aspects of successful 23 cm operation: Propagation Obstructions are more of a problem 23 cm signals can sneak through holes that the lower bands can’t 23 cm for H/T’s is about as good as 2M but not as good as 70 cm 23 cm doesn’t work as well for mobile to mobile as 70 cm or 2M Little impulse noise or IMD on 23 cm

8 23 cm Propagation (Continued) Base Station and Repeater Antennas should have a clear view of the horizon Repeater or base station DV or FM operation can be just as good as 2M or 70 cm DD is at a 13 db disadvantage to DV due to the increased Bandwidth. Seven Bars of Signal on the ID-1 “software” S Meter for DD Nobody has ever installed a preamp or Power Amp on an ID-1 for use in DD mode

9 Transmission line Do not use RG 58 or RG 214 (RG 8) LMR 195 at a minimum, for mobile installations. Use larger cable, if possible Belden 8214 for very short flexible non- repeater jumper cables LMR 400 type for longer jumpers or repeater jumpers 1 ¼” Heliax vs ½” Heliax

10 Connectors Do not use UHF connectors! Avoid BNC connectors Always try to use N, SMA, TNC or Mini UHF connectors Purchase the correct connector for your cable Purchase name brand connectors and cable only Do not buy “bargain” connectors or cable Installing Connectors requires some Skill

11 Mobile Antennas Comet SBB 97 and Diamond NR 2000 Triband antennas use an N mount Comet SB 123 is an N mount monobander Diamond NR 124 NMO monobander is the best mobile antenna available 6 GHz rated NMO Mounts PCTEL-Maxrad removable center pin with LMR 195 cable PCTEL-Maxrad 3 GHz Magnetic Mount with LMR 195 cable

12 Base Station Omni Antennas Diamond X-6000 Tribander and F 1230 Monobander Comet GP 95 and GP 98 Tribander Make your own!

13 Yaghis M 2, Directive Systems or SHF No Japanese Yaghis Make your own

14 Repeater Antennas Hustler Spirit 12db

15 Test Equipment Bird 43 Wattmeter Slugs are available Most “Service Monitors” only go to 1000 MHz

16 23 cm Digital Voice DV on 23 cm is no different than 70 cm or 2M An ID-1 will do everything that the 70 cm and 2M radios will do 1294.3 MHz has become the accepted DV Simplex frequency

17 Digital Data Simplex AKA Computer Networking using the ID-1 as a NIC card for Peer to Peer Computer Networking

18 Peer to Peer Computer Networking No File Server No hub or Switch No internet connection The two computers can see each others hard drives and can share files

19 Peer to Peer Networking (Wired)

20 The ID-1, in DD Mode, can be thought of as a 128 Kbps, 10 watt Wireless Network Card that can be connected to an external Antenna


22 Frequencies 1240 to 1260 MHz Most antennas will have high SWR below 1250 500 KHz channel spacing 1259.5 Shared non protected DD Simplex

23 Peer to Peer Computer Networking using ID-1s Set up your computers for file sharing Use a fixed IP address Connect the computers using a crossover cable Get the computers find each other Map Network Drives, Mount Volumes, etc

24 Peer to Peer Computer Networking with an ID-1 (continued) Put the ID-1s in DD Simplex mode Make sure they are on the same frequency and that Transmit Inhibit is not enabled Use Callsign routing Connect the computers to the ID-1s using Ethernet cables Start the computers

25 Internet Access using Two ID-1s Connect the Base Station ID-1 to your cable or DSL modem, using the Ethernet cable Connect the mobile ID-1 to a computer, using the Ethernet cable Set up your mobile computer for DHCP Make sure both ID-1s are set up on the same data simplex frequency and that Transmit Inhibit is turned off

26 Internet access using a DD “Repeater" ICOM ID-RP2D Data Module Repeater must be on the Gateway Set up your computer for Dynamic IP

27 ID-1 Callsign Setup on KJ4ACN for Internet Access UR = KJ4ACN RPT1 = KJ4ACN A RPT2 = KJ4ACN G

28 ID-1 Setup for Internet Access using a Repeater Set the ID-1 to the Repeater Data Frequency Set the mode to RPS Transmit Inhibit should be turned off Connect your computer to the Ethernet Port

29 The Future of DD The World has changed The Communications needs of the Relief and Public Safety Agencies have Changed and become more Sophisticated Amateur Radio has not kept up with technology Hams can provide little more to the Served Agencies than we could in 1970

30 Emergency Minnesota Amateur Radio Disaster Data Network

31 Basic D Star 3:45 pm @ Orlando Hamcation Buddy Morgan WB4OMG

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