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The Internet Radio Linking Project

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The Internet Radio Linking Project. Presented by the. KD4RAA Repeater Group ... IRLP stands for Internet Radio Linking Project, the brainchild of Dave Cameron ... – PowerPoint PPT presentation

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Title: The Internet Radio Linking Project


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The Internet Radio Linking Project
I.R.L.P.
  • Presented by the
  • KD4RAA Repeater Group

www.kd4raa.net
Portions of this presentation are reproduced
courtesy of VE3SY VE7LTD
3
Presentation
  • Modes of Operation
  • IRLP Node Status
  • IRLP Operation
  • How To IRLP
  • Active nodes (maps)
  • 146.775 on reflectors441.725 point-to-point
  • Raleigh IRLP Policy 2m open / 440 for
    supporting membership
  • Use things to remember
  • IRLP QSO Demo
  • Introduction - who we are
  • KD4RAA-K4JDR Repeater Group and Link System
  • Affiliated repeaters
  • What is IRLP?
  • Nodes vs. Reflectors
  • Reflector Mode
  • Point to Point Mode
  • Inventor
  • Technology - How it Works
  • Node 426/427 configuration

4
The KD4RAA Repeater Group
  • First organized in 1994
  • Cooperative effort of NC and SC hams
  • Not affiliated with any specific club
  • Purpose fostering good amateur radio practice,
    developing technical skills, repairing and
    maintaining repeater systems, exploring new
    technologies, and taking an active role in
    helping establish and maintain local, interstate,
    and international repeater network capabilities
  • Individual ham radio operators bringing
    distinctive skills, resources and knowledge to
    facilitate other organized efforts and repeater
    projects
  • Self-supporting though the generous donations
    and cooperation of area hams and non-hams

5
Target Goal of KD4RAA-K4JDR Repeaters HAVING FUN
with Amateur Radio !
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KD4RAA-K4JDRSupported Repeaters
  • K4JDR 441.725 West Raleigh Hub (IRLP 427)
  • KD4RAA 444.875 Raleigh Temp Site
  • K4JDR 444.775 Cary
  • NC4SU 146.775 Raleigh Fairgrounds (IRLP 426)
  • W4ATC 442.675 NCSU, Raleigh (IRLP 741 temp)
  • KA2FWC 443.625 Ericsson, RTP
  • N4HAJ 444.575 Kinston (IRLP node 429)
  • N4ZBB 444.675 RTP
  • KB4PQA 443.125 Greenville, SC
  • K4JDR 444.150 Clayton (soon)
  • NE4J 444.650 Middlesex
  • KB4WGA  444.925 Durham
  • KB4WGA   444.375 Henderson- Kerr Lake
  • K4OBX 145.150 Buxton- Outer Banks
  • KD4MJO   443.525 South Hill, VA
  • N4JDW 145.170 Wilmington, NC (IRLP node 748)

9
KD4RAA-K4JDRLinked as ofApril 2002
  • K4JDR 441.725 West Raleigh Hub (IRLP 427)
  • KD4RAA 444.875 Raleigh Temp Site
  • K4JDR 444.775 Cary
  • NC4SU 146.775 Raleigh Fairgrounds (IRLP 426)
  • W4ATC 442.675 NCSU, Raleigh
  • KA2FWC 443.625 Ericsson, RTP
  • N4HAJ 444.575 Kinston (IRLP 429)
  • N4ZBB 444.675 RTP
  • KB4PQA 443.125 Greenville, SC
  • K4JDR 444.150 Clayton (soon)
  • NE4J 444.650 Middlesex
  • KB4WGA  444.925 Durham
  • KB4WGA   444.375 Henderson- Kerr Lake
  • K4OBX 145.150 Buxton- Outer Banks
  • KD4MJO   443.525 South Hill, VA
  • N4JDW 145.170 Wilmington, NC (IRLP node 748)

10
KD4RAA-K4JDRProposed Linked
  • K4JDR 441.725 West Raleigh Hub (IRLP 427)
  • KD4RAA 444.875 Raleigh Temp Site
  • K4JDR 444.775 Cary
  • NC4SU 146.775 Raleigh Fairgrounds (IRLP 426)
  • W4ATC 442.675 NCSU, Raleigh
  • KA2FWC 443.625 Ericsson, RTP
  • N4HAJ 444.575 Kinston (IRLP 429)
  • N4ZBB 444.675 RTP
  • KB4PQA 443.125 Greenville, SC
  • K4JDR 444.150 Clayton (soon)
  • NE4J 444.650 Middlesex
  • KB4WGA  444.925 Durham
  • KB4WGA   444.375 Henderson- Kerr Lake
  • K4OBX 145.150 Buxton- Outer Banks
  • KD4MJO   443.525 South Hill, VA
  • N4JDW 145.170 Wilmington, NC (IRLP node 748)

11
New Repeater Henderson 444.375 100.0
PLKB4WGADirectional NorthEast
12
KD4RAA-K4JDR Supported RepeatersGeneral
Transmitter Location
13
What is I.R.L.P. ?IRLP stands for Internet
Radio Linking Project, the brainchild of Dave
Cameron VE7LTD of Vancouver BC.   Dave was
frustrated with the unreliable operation of the
Windows based IPHONE and decided to build a
system on a LINUX platform. Iphone and other
systems use VOX where the IRLP digital concept
reduces delays to almost nil thus many less
missed first words of a transmission.
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IRLP System Designer
  • Callsign VE7LTD   
  • Name David Cameron
  • Addr 4708 CAULFIELD DRIVE
  • City WEST VANCOUVER, BC V7W 1G2
  • Country CANADA
  • Birthday 06 Aug 1975
  • Email ve7ltd_at_irlp.net
  • Home Page http//www.irlp.net

15
VE7LTD and VK2YX
16
Eight months later in 1998 the IRLP network was
born and is now on Version 2.0 of
hardware/software and growing in leaps and
bounds. IRLP allows the linking of two or more
repeaters together using Voice over IP technology
(VoIP) where the analogue radio audio is
converted to digital IP packets and sent over the
net.
17
IRLP requires a full time high speed Internet
connection, a dedicated Linux computer, some
custom hardware and a link radio. Each Linux box
on the IRLP network is assigned a code and a
central name-server keeps track of the IP
addresses (IP the routing code used by all
packet of internet data flowing on the internet)
in use by all nodes.
18
The IRLP uses a Voice-Over-IP (VoIP) streaming
software called Speak Freely. Linux is the
operating system of choice for the IRLP system as
it allows the best in reliability,
programmability, efficiency, and functionality. 
Most IRLP nodes use RedHat Linux 6.2 as it is a
very stable release and runs very smooth on any
486 Dx100 class or better computer .
19
Davids custom IRLP software -takes the audio
from the receiver which is fed into the sound
card - where it is converted into ADPCM digital
data the same format used by the phone companies
for Long Distance service.IRLP by design
requires Amateur Radio access, all QSOs are over
the air. No computer to computer access is
allowed (this is not I-link)
20
IRLP Amateur Radio or Not ?
21
Hardware from VE7LTD
  • The Custom Red Hat CD-ROM
  • Red Hat Boot Diskette
  • Custom IRLP Software
  • Custom IRLP Control Board by Dave Cameron
    VE7LTD
  • Does COR, PTT DTMF
  • DB9 IRLP to Repeater Interface
  • LPT1 to IRLP Jumper Cable

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DB9 for Xcvr Inter-face
DB25 for Data Control from Linux Box IRLP
12VDC from PC
23
IRLP Indicators on Control Board
DTMF Decode Sense Carrier
Operated Squelch Sense PTT out to Link
Radio or Controller
24
Typical Node Setup No.1
8-64Kb Internet connection To another IRLP Node
RF Link
CATV/DSL MODEM
10Mb Ethernet Connection
Repeater or Remote Base
PTT COR Audio
Router
RF Link
Repeater Controller Link Port
10/100Mb Ethernet Connection
Link Xcvr
Link Xcvr
PTT COR Audio
PTT COR Audio
IRLP Computer w/ Custom Red Hat 6.2 O/S
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Typical Node Setup No.2
8-64Kb Internet connection To another IRLP Node
RF Link
CATV/DSL MODEM
10Mb Ethernet Connection
Repeater or Remote Base
RF Link with CTCSS gating COS
PTT COR Audio
Router
10/100Mb Ethernet Connection
Repeater Controller Link Port
PTT COR Audio
Link Xcvr
IRLP Computer w/ Custom Red Hat 6.2 O/S
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Typical Node Setup No.3
8-64Kb Internet connection To another IRLP Node
RF Link
CATV/DSL MODEM
10Mb Ethernet Connection
Repeater or Simplex Radio
PTT COR Audio
Router
Repeater Controller Link Port
10/100Mb Ethernet Connection
PTT COR Audio
IRLP Computer w/ Custom Red Hat 6.2 O/S
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Node 426 KD4RAA (1)
300Kb Internet connection To another IRLP Node
RF Link
Internet Hub
Local 2M 146.775 Repeater
10Mb Ethernet Connection
Multi-PortSwitch
VHF Link Radio PTT,COR, DTMF,TX/RXAudio
NODE TO REFLECTOR
10/100Mb Ethernet Connection
IRLP Linux Computer w/ Custom Red Hat 7 O/S
IRLP interface
28
Node 427 KD4RAA (2)
300Kb Internet connection To another IRLP Node
RF Link
Internet Hub
Local UHF Repeater
10Mb Ethernet Connection
LinksysRouter DHCP
UHF Link Radio PTT,COR, DTMF,TX/RXAudio
10/100Mb Ethernet Connection
IRLP Linux Computer w/ Custom Red Hat 7 O/S
IRLP interface
NODE TO-NODE
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Node 429 N4HAJ Kinston
300Kb Internet connection To another IRLP Node
RF Link
Internet Hub
Local UHF Repeater
10Mb Ethernet Connection
LinksysRouter DHCP
UHF Link Radio PTT,COR, DTMF,TX/RXAudio
10/100Mb Ethernet Connection
IRLP Linux Computer w/ Custom Red Hat 7 O/S
IRLP interface
NODE TO-NODE
30
748 N4JDW Wilmington
300Kb Internet connection To another IRLP Node
RF Link
Internet Hub
Local VHF Repeater
10Mb Ethernet Connection
LinksysRouter DHCP
VHF Link Radio PTT,COR, DTMF,TX/RXAudio
10/100Mb Ethernet Connection
IRLP Linux Computer w/ Custom Red Hat 7 O/S
IRLP interface
NODE TO-NODE
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741 KD4RAA-3 Raleigh
300Kb Internet connection To another IRLP Node
RF Link
Internet Hub
Local UHF Repeater
10Mb Ethernet Connection
LinksysRouter DHCP
UHF Link Radio PTT,COR, DTMF,TX/RXAudio
10/100Mb Ethernet Connection
IRLP Linux Computer w/ Custom Red Hat 7 O/S
IRLP interface
NODE TO-NODE
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100MB Switch 10MB HubLinksys Router
DualBand 2M/440Control Xcvr
440 Link Radio 2M Link Radio Audio Equalizer
and Broadcast Leveling
KD4RAANode 426 / 427Configuration
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Modes of Operation
  • There are two modes of IRLP operation
  • Point to Point Mode Only two repeaters are
    linked
  • This mode is much like linking two repeaters
    together via a link radio or remote base
  • Reflector Mode Multiple Audio Streams
  • -Much like a party line everyone hears everyone
    else

36
Reflector Mode
North Carolina
RPTR
Canada
RPTR
RPTR
UnitedKingdom
Texas
RPTR
RPTR
Australia
IRLP Reflector
Hawaii
California
RPTR
RPTR
Raleigh Reflector 921
37
Point to Point Mode
Raleigh
RPTR
IRLP Server
Miami
RPTR
38
IRLP Network
30 Australia 3 New Zealand 140 Canada 15
England Scotland 232 United States
39
IRLP Network
Caribbean 1 Barbados 2 Dominica 3 Trinidad
TobagoOthers 1 Antarctica 1 Ecuador 1 Japan 1 Net
herlands 2 South Africa 1 Sweden
40
IRLP Network
20 new nodes per month Nets IRLP
International Nets (biweekly), ISS contacts,
JOTA, Kids Net, Special Weather, others
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Australia
United Kingdom
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FACTS
North Carolinas first IRLP node, more
planned 146.775 NC4SU 426 located in Raleigh at
340 feet, near the Fairgrounds , open node,
courtesy tone present when IRLP link is active,
normally -REF 2 441.725 K4JDR 427 located in
Raleigh at 340 feet closed node, NO courtesy
tone/ hang when link is active. Linked to 444.875
Raleigh, 444.775 Cary, 444.675 RTP, 444.925
Durham, 444.375 Henderson Control ops Dan
KD4RAA, Ron K4JDR, Todd N2XLJim WW4M, Byron
K4NGJ, Ken N4ZBB, Jack N0VLD
44
FACTS
East Coast Reflector 921 signed on October 18,
2001.  Its Red Hat Linux-based server resides at
the offices of Inflow in Research Triangle Park. 
Jack Thorpe, WA0ERX is the node administrator and
is responsible for helping us secure the server
and bandwidth at Inflow.
45
FACTS
The purpose for having our own reflector is to
link our regional participating repeaters in the
KD4RAA-K4JDR Repeater Group that are out of range
of our present RF capabilities.  This will give
us Emergency and Severe Weather Coordination
ability as well as provide support for Public
Service Events.  We reserve use of 921 for
coordinated response to severe weather and other
conditions that affect North Carolina.
46
FACTS
East Coast Reflector 921 has been used to
Track our recent Winter Snow Storm. Nodes from
GA, SC, NC, VA participated. Coordinate the
Worldwide Boy Scouts Jamboree over the Air.
JOTA Make a connection to the McMurdo Science
station in Antarctica for a This week in Amateur
Radio Newsline Feature.
47
FACTS
Broadcast worldwide to participating IRLP
nodes the International Space Station (ARISS)
educational contact from Chapel Hill. 921 Used
as the Primary Backup to the ever popular Denver
Reflector 2 (920) Connect our Regional IRLP
Repeaters (Kinston, Wilmington, Outer Banks, and
others) for Linking and Maintenance .
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FACTS
IRLP Node 429 activated December 2001Doug
Blizzard N4HAJ Kinston, NC 444.575
88.5 Link on Demand to Ref921 to K4JDR-KD4RAA
link System
64
FACTS
IRLP Node 748activated April 2002David Whicker
N4JDWWilmington, NC 145.170 88.5 Link on
Demand to Ref921 to K4JDR-KD4RAA link System
65
FACTS
IRLP Node 741activated April 2002Danny Musten
KD4RAARaleigh, NC Frequency Agile Currently
- 442.675
66
FACTS
IRLP Nodes soon to come on line Outer
Banks (Richard Marlin K4HAT) Greenville, SC
(Terry Lambert KB4PQA)
67
Pause between transmissions, listen for
othersHold your PTT for about 1 second before
talking to allow all nodes time to riseNo local
rag-chews when on a reflectorDo not kerchunk --
which causes all other nodes to key upDo not
discuss codes -- refer inquiries to a local
control op or request a supporting
membershipMake sure your signal is solid
REMEMBER
68
Anything you do on an IRLP reflector can be heard
around the world. Please listen to observe how
others do it before you give it a try.
69
For More Information
  • IRLP in Raleigh
  • www.kd4raa.net
  • General Information about IRLP www.irlp.net
  • Node Activity Connection Status status.irlp.net
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