D Star Digital Data (DD)Buddy Morgan WB4OMG

Trustee KJ4ACN D Star Repeater, Lakeland, FL

beamar@aol.com

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

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)

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)

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

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

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

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

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

Base Station Omni Antennas

• Diamond X-6000 Tribander and F 1230 Monobander

• Comet GP 95 and GP 98 Tribander• Make your own!

Yaghis

• M2, Directive Systems or SHF• No Japanese Yaghis• Make your own

Repeater AntennasHustler Spirit 12db

Test Equipment

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

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

Digital Data SimplexAKA Computer Networking

using the ID-1 as a NIC card for Peer to Peer Computer Networking

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

Peer to Peer Networking (Wired)

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

Frequencies

• 1240 to 1260 MHz• Most antennas will have high SWR below

1250• 500 KHz channel spacing• 1259.5 Shared non protected DD Simplex

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

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

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

Internet access using a DD “Repeater"

• ICOM ID-RP2D Data Module• Repeater must be on the Gateway• Set up your computer for Dynamic IP

ID-1 Callsign Setup on KJ4ACN for Internet Access

UR = KJ4ACN RPT1 = KJ4ACN A RPT2 = KJ4ACN G

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

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

www.14567.org

Emergency Minnesota Amateur Radio Disaster Data Network

Basic D Star 3:45 pm @ Orlando Hamcation

Buddy Morgan WB4OMGbeamar@aol.com