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IRLP

IRLP = Internet Radio Linking Project


The Atlanta Radio Club now has two nodes for IRLP.  Node 4550 is stationed on our 146.82- (PL 146.2 Hz) via a UHF link, and node 5070 works our 444.825 repeater directly.  The most important site for information about IRLP is at http://www.irlp.net so please review that page carefully.


With IRLP there are two basic modes. We can either connect to a "Reflector" where many repeaters are connected, or we can make point-to-point connections. The Reflectors can be crowded and can "take over" a repeater. Point-to-point connections are simply one repeater linking to another over the Internet. As I write this I am leaving 146.82 unconnected, but available for point-to-point connections. If you hear someone on our repeater from out of state, you are most likely hearing IRLP.


Dues paying members of the Atlanta Radio Club will receive the prefix dtmf codes to access the IRLP network, but when our repeaters are linked all hams are welcome to join the fun!  Visitors from out of town are welcome to access the system, and should contact a w4doc control operator for access.


If the Reflector is carrying a lot of traffic, conversations between locals may be inappropriate.  If you want to talk to a local ham then QSY to one of our other Atlanta Radio Club repeaters.  We should reserve the Reflectors for world-wide communication.


If you hear a conversation on our repeaters when they are linked into IRLP, join in on the conversation just like you would any other repeater QSO, but please allow more time between transmissions! Also pause a second when you first key up your mic before speaking.  These pauses compensate for the delay inherent in IRLP when someone keys up and starts talking.  It takes a moment for the local computer to send the audio out to the Internet, to the Reflector and back to the other repeaters.  For this reason it is more important to pause between transmissions on the Reflectors to allow for breakers, than it is when using point-to-point connections.


To see a list of IRLP-enabled repeaters see the “Active Node Status” page at http://status.irlp.net  This page is updated in real time with the status of each IRLP node!  Check the status page prior to initiating a connection, because the repeater you want may be unavailable.There is even a Reflector status page at http://irlp.g4eid.co.uk/status/all_reflectors.html to see who is connected to the Reflectors at any time.  You can also find a map of nodes worldwide at http://maps.irlp.net

 

How we set this up


For node 4550 we have a Linux based PC at the bank tower.  This PC is connected to the Internet via a broadband internet service and is running the special IRLP software.

 

 

IRLP – Node 4550 Instructions

 

1- By default, the IRLP node is on 146.820. Therefore, if you are using the IRLP system on 146.820, proceed to step 2. If you need to use IRLP on 444.825, for example if there is currently a conversation on 146.820, wait for a break in the conversation, ask for permission to control, and run macro 563 to disconnect the IRLP system from 146.820. Then, go over to 444.825, and run macro 566 to connect the IRLP system to 444.825. Then, proceed to step 2.

 

2 – Dial the IRLP node you wish to use:
D#### (D and the node number) connects you to IRLP Node ####. Example D6572 connects to our sister club, VK3ATL the Geelong ARC in Australia.

 

3 – To disconnect the remote system, dial D73 – End IRLP session. From here you can connect to another node or end your session. If you are on 146.820, please ignore step 4.

 

4 – If you have moved the IRLP link over to 444.825, please disconnect the IRLP system from 444.825 by running macro 567, then run macro 562 on 146.820.


 

The IRLP system also depends on Dave Cameron, VE7LTD, who puts in countless hours making the network run smoothly.  If you ever run into Dave on IRLP, be sure to thank him. The IRLP system is growing and changing all the time. Check the IRLP home page at http://www.irlp.net for the latest news.

 


An excellent explanation of IRLP operating practices that is required reading if you plan to use IRLP can be found at http://www.irlp.net/guidelines.html