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Unfamiliar with IRLP ? - Here is a brief description of what it does.

IRLP is used to link Amateur Radios via the Internet. You can connect an Amateur Radio Station located in one city to another Radio Station located anywhere through out the world as long as there is an IRLP connection available at each location. It can just as easily links radios from one edge of a large city to an opposite edge to avoid obstructions in the radio paths as long as there are IRLP nodes available at both edges.


An Example:

Let's say you are in Dayton, OHIO. If you accessed a Dayton IRLP node and (using your radio's touch tone microphone) dialed a node number of 3502. You would connect the IRLP node radio in Dayton to the IRLP node #3502 located near Spokane, Washington. Once connected, transmissions made to the Dayton IRLP node radio would be passed via the Internet to the receiving node #3502 and broadcast through a VHF repeater located just southeast of Spokane. This VHF repeater covers the eastern Spokane area and portions of western Idaho. From Dayton you would be able to chat with anyone who might be listening to the repeater in the Spokane area. When you finish your chat, you would terminate the connection between the two nodes by dialing the number 73 and the link will disconnect.

Had you dialed a different node number than 3502 you could have just as easily ended up connecting to Japan or Canada or any other IRLP node throughout the world.

In concept using an IRLP system is like using an auto-patch. Which means you need to locate an radio system with IRLP capabilities near your location to call FROM. Plus you will need to know the number to dial for the location you wish to connect TO. To use the IRLP system you will need to look up that type of information.

The most current and complete IRLP information is found by visiting the Internet at the link below.

You can also find some IRLP node information in the ARRL Repeater Directory.

If you have never used an IRLP connection

Read on and I will walk you through the process of making a connection between two IRLP stations that are located within the USA    (grab a pencil and paper)

Start by visiting
The link provides a listing of U.S.A. IRLP Nodes sorted by each State. (Scroll around)

You will need to do a few things using this listing.

1. Choose a node in the State/City location you wish to connect TO
Make a note of it's 4 digit node number located on the list's left edge.

2. Find a node located near your present position to call FROM
Select a local node close to you with a frequency in a band that works with your radio. Click on its node number on the left. The next screen displayed will provide the information needed to program your radio to communicate with your local IRLP connection point.

3. Set your radio to your local node's frequency for your location - to call FROM
(make certain you program your radio for the proper offset if using a repeater plus activate any CTCSS tone if required).

4. Once the above is done listen for a bit to make certain the frequency isn't in use. Then key your radio, identify yourself and announce that you are accessing the node.
Using your radio's touch tone pad .. (Radio Keyed) dial the 4 digit number for the node you selected earlier for the State/City you would like to connect TO and un-key.

If everything is working properly you will hear a connect message corresponding to the number you just dialed. If you do not hear the connect message your attempt failed. Recheck your radio settings and try again. If you still have problems ask on the air for assistance. Others may be listening and may be able to help determine what went wrong.

After hearing a connect message .. always listen for a 5 to 10 seconds after you make a connection to make sure a conversation isn't in progress.

After you've determined it is clear, call any station you wish to chat with just as you would on any radio. If you just wish to talk with anyone available say so... hopefully some will be monitoring and answer your request.

Once you get a reply, chat as you would using any radio system. Remember pause a bit between each key up. This allows others to break-in if need be and also allows radio and computer systems time to reset logic.

Keep in mind IRLP is not full duplex like a telephone, it is a Radio system, one person talks and others listen.

When finished with your connection, announce you are disconnecting. Dial 73.
A disconnect message will play. Once the disconnect plays - sign clear of the local radio system you used to make your call and you are done.  Very Simple!!

Owners only ask users to remember that IRLP nodes may connect to repeaters or radios systems with many users. Even though you may call from a little used IRLP system the receiving node might be a high traffic system where many others may be waiting to use the IRLP node or repeater.

Be courteous!! -- Limit Long Long rag chews with that thought in mind.

Operating Notes:

1. When you or the other station let up on the microphone it may require a pause of a sec or so before keying up to allow radios and computers time to transition between transmit and receive. It also gives time for other stations to break in if needed.

2. An IRLP node can only connect to a node number other than it's own.

3. IRLP nodes may use a transmit timeout timer (usually 4 Minutes) if you don't un-key occasionally it will time out. That being said, let up on the mic and take a breath once in a while --- It gives others a chance to reply.

4. Nodes indicate "BUSY" to other incoming connection attempts while in use.

Always disconnect when finished.