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The Internet Radio Linking Project
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  1. 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

  2. Presentation • 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 • 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

  3. 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

  4. Target Goal of KD4RAA-K4JDR Repeaters… HAVING FUN with Amateur Radio !

  5. 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)

  6. 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)

  7. 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)

  8. New Repeater Henderson 444.375+ 100.0 PLKB4WGADirectional NorthEast

  9. KD4RAA-K4JDR Supported RepeatersGeneral Transmitter Location

  10. 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.

  11. 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@irlp.net • Home Page: http://www.irlp.net

  12. VE7LTD and VK2YX

  13. 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.

  14. 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.

  15. 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 .

  16. David’s 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 QSO’s are over the air. No computer to computer access is allowed (this is not I-link)

  17. IRLP … Amateur Radio or Not ?

  18. 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

  19. DB9 for Xcvr Inter-face +12VDC from PC DB25 for Data Control from Linux Box & IRLP

  20. IRLP Indicators on Control Board – DTMF Decode Sense – Carrier Operated Squelch Sense – PTT out to Link Radio or Controller

  21. 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

  22. 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

  23. 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

  24. 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 RadioPTT,COR, DTMF,TX/RXAudio NODE TO REFLECTOR 10/100Mb Ethernet Connection IRLP Linux Computer w/ Custom Red Hat 7 O/S & IRLP interface

  25. 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 RadioPTT,COR, DTMF,TX/RXAudio 10/100Mb Ethernet Connection IRLP Linux Computer w/ Custom Red Hat 7 O/S & IRLP interface NODE –TO-NODE

  26. 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 RadioPTT,COR, DTMF,TX/RXAudio 10/100Mb Ethernet Connection IRLP Linux Computer w/ Custom Red Hat 7 O/S & IRLP interface NODE –TO-NODE

  27. 748 – N4JDW Wilmington 300Kb Internet connection To another IRLP Node RF Link Internet Hub Local VHF Repeater 10Mb Ethernet Connection LinksysRouter DHCP VHF Link RadioPTT,COR, DTMF,TX/RXAudio 10/100Mb Ethernet Connection IRLP Linux Computer w/ Custom Red Hat 7 O/S & IRLP interface NODE –TO-NODE

  28. 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 RadioPTT,COR, DTMF,TX/RXAudio 10/100Mb Ethernet Connection IRLP Linux Computer w/ Custom Red Hat 7 O/S & IRLP interface NODE –TO-NODE

  29. 100MB Switch 10MB HubLinksys Router DualBand 2M/440Control Xcvr 440 Link Radio 2M Link Radio Audio Equalizer and Broadcast Leveling KD4RAANode 426 / 427Configuration

  30. 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

  31. Reflector Mode North Carolina RPTR Canada RPTR RPTR UnitedKingdom Texas RPTR RPTR Australia IRLP Reflector Hawaii California RPTR RPTR Raleigh Reflector 921

  32. Point to Point Mode Raleigh RPTR IRLP Server Miami RPTR

  33. IRLP Network 30 Australia 3 New Zealand 140 Canada 15 England + Scotland 232 United States

  34. IRLP Network Caribbean 1 Barbados 2 Dominica 3 Trinidad & TobagoOthers 1 Antarctica 1 Ecuador 1 Japan 1 Netherlands 2 South Africa 1 Sweden

  35. IRLP Network 20+ new nodes per month Nets: IRLP International Nets (biweekly), ISS contacts, JOTA, Kids Net, Special Weather, others

  36. Australia United Kingdom

  37. FACTS North Carolina’s 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

  38. 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.

  39. 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.

  40. 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. JOTAMake a connection to the McMurdo Science station in Antarctica for a “This week in Amateur Radio Newsline” Feature.

  41. 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 .