Saturday, Mar 6 2010 Introductions Lets get to know one another Purpose Introduce new users to D-Star Refresh current users in procedures and practices
Help with radio programming including programming examples Explain D-Controller functions and command structure Explain Linking, Routing, Reflectors What IS D-Star? Digital Smart Technologies for Amateur Radio Developed jointly by the Japan Amateur Radio
League and ICOM beginning in 1999 Significant changes released in 2004 Defines two modes DD (Digital Data) High-speed digital data only on 1.2 GHz not in very wide use DV (Digital Voice) Voice (and a low-speed data channel) available on 2 m, 70 cm, and 23 cm
Well be discussing the DV mode Digital Voice Uses the AMBE CODEC, provided by Digital Voice Systems, Inc. Operates at 4800 bps 2400 bps for the voice channel 1200 bps for the Forward Error Correction
channel 1200 bps for the low-speed data channel Approximately 6.25 kHz occupied bandwidth a significant spectrum savings compared to 16 kHz occupied by a standard FM voice signal Advantages and Disadvantages Range is approximately the same as a
standard FM repeater, but with a difference Standard FM Repeater signals gradually degrade and get noisier with distance D-Star signals decode and sound fine until they drop off a cliff Marginal D-Star signals will R2D2 D-Star radios cost somewhat more than
comparable FM radios While an open standard, only ICOM is making D-Star equipment More Advantages and Disadvantages CODEC is proprietary this gives some people heartburn
Programming becomes more difficult You can link to any connected D-Star repeater in the world with simple commands Linking is currently Internet based, reducing reliability in the event of a disaster There are many more advantages and disadvantages, but well leave that for future discussions Current NC D-Star Repeaters
W4GSO Greensboro, NC 70 cm AK4EG Burlington, NC 2 m, 70 cm, 23 cm KR4RDU Carrboro, NC 70 cm KI4WXS Charlotte, NC 2 m, 70 cm, 23 cm KR4RAL Raleigh, NC 70 cm On To The Good Stuff OR How to USE that new D-Star radio!
Some Definitions to Start Off Repeater D-Controller Gateway D-Plus Reflector Linking Routing DV-Dongle DV-Access Point
Quick-Key Callsign Fields MyCall UrCall Repeater 1 Repeater 2 How to Make It All Work Think of it like layers
Normal FM repeater Frequency, Offset, maybe Tone D-Star repeater Frequency, Offset, ID (MyCall), Destination (UrCall), Repeater used (R1), Additional Repeater used (R2) All fields must be properly set to make it work like you want it to Some Examples
For regular day-to-day communications MyCall K4HC UrCall CQCQCQ R1 W4GSO**B R2 W4GSO**G This enables anything I transmit to pass to the Gateway this includes connected Dongles, Access Points, Repeaters and Reflectors
For local ONLY communications (e.g. dont want to interrupt conversations on a connected reflector) MyCall K4HC UrCall CQCQCQ R1 W4GSO**B R2 Blank or Not Use
My transmissions WILL NOT be passed to the Gateway will ONLY be heard on the local repeater Linking vs Routing Routing defined in the D-Star standard Linking defined by D-Plus Routing is more cumbersome Every station wishing to participate must alter
their settings to participate in Routing Linking requires a single command, then everyone set up for Gateway operation can participate Routing is blind you cant hear whats going on at the distant end For these reasons, Linking is normally preferred over Routing Routing A BRIEF Overview
Two types of Routing Callsign Routing (to a specific station) Source Routing (to a specific Repeater) One advantage of Callsign Routing is you dont need to know WHERE the called station is the call is routed to the last repeater where that station was heard (some delay in this)
Callsign Routing MyCall K4HC UrCall WG5Q R1 W4GSO**B R2 W4GSO**G Routed to last heard repeater/port WG5Q used To reply, WG5Q would need to alter his
settings (using one-touch reply) Source Routing MyCall K4HC UrCall /KR4RDUB R1 W4GSO**B R2 W4GSO**G Transmissions would output on the KR4RDU
Port B repeater To reply, a station would need to alter settings Note the port is in the 8th position Linking THE Preferred Way MyCall - Stays the same, all the time UrCall Normally CQCQCQ Also used to Link, Unlink, Callsign Route, Source Route, issue D-Plus and D-Controller
commands R1 Always the repeater and port you are talking into 8 digits R2 Used for Gateway and (future) RF port forwarding 8 digits Link Examples MyCall K4HC
UrCall REF017CL R1 W4GSO**B R2 W4GSO**G This will link the repeater to Reflector 17C Note L in the 8th position This is the only time the port is moved from the 8th position to the 7th position
Link Examples MyCall K4HC UrCall KR4RDUBL R1 W4GSO**B R2 W4GSO**G This will link W4GSO B to KR4RDU B Note no space between KR4RDU and B Note L for Link in position 8
Link Examples MyCall K4HC UrCall - *******U R1 W4GSO**B R2 W4GSO**G U in the 8th position This will Unlink from any repeater or reflector
Command Examples MyCall K4HC UrCall W4GSO**E R1 W4GSO**B R2 Not Use Echos from D-Controller Also shows BER (Bit Error Rate)
Command Examples MyCall K4HC UrCall W4GSO**E R1 W4GSO**B R2 W4GSO**G Echos from D-Plus Also shows BER Command Examples
MyCall K4HC UrCall W4GSO*S0 R1 W4GSO**B R2 Not Use SAVES a message for automatic playback Command Examples MyCall K4HC UrCall W4GSO*R0
R1 W4GSO**B R2 Not Use RECALLS (Plays) a recorded message Command Examples MyCall K4HC UrCall W4GSO*C0 R1 W4GSO**B R2 Not Use
CLEARS a recorded message Notes on Channel Memories More Programming Ideas Use Memory Banks for different areas Develop a naming convention that YOU understand
Buy the Software, and make or buy the cables your life will be much easier Questions? Thank You!
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JOHN DEWEY's theory of connected experiences for exploratory and reflective thinking. LEV VYGOTSKY's Zone of Proximal Development (ZPD) that stresses the essence of provocation and scaffolding in learning. JEROME BRUNER's theory on learner's varied world perceptions for their own interpretations.