Transcript D Star Digital Data (DD)

D Star Digital Data (DD)
Buddy Morgan WB4OMG
Trustee KJ4ACN D Star Repeater,
Lakeland, FL
[email protected]
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:
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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 nonrepeater 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 Antennas
Hustler 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 Simplex
AKA Computer Networking
using the ID-1 as a NIC card for
Peer to Peer Computer Networking
Peer to Peer Computer Networking
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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
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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
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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 WB4OMG
[email protected]