927.1250 Repeater ~ KD6LVP Repeater

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IRLP and Echolink

 

IRLP ~ Internet Radio Linking Project

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IRLP stands for the Internet Radio Linking Project. The aim of this project is to link radio systems separated by long distance without the use of expensive leased lines, satellites, microwaves, or controllers. A simple and easy system to link radio systems together using the Internet as the communications backbone.

 The IRLP uses Voice-Over-IP (Speak-Freely) software and the power of the Internet to link radio systems across the world. The IRLP system uses its own custom interface board and software suite which makes interfacing radio systems to the world simple and cost effective.

Goal

It is not the goal of this project to compete, but to work along with other networks to improve the technology and improve radio linking communications for all involved parties. The people who benefit most from the IRLP are its users.
 

History of IRLP?

The Internet Radio Linking Project was started back in November of 1997 as an attempt to use the internet to link radio systems across Canada. The first full time link that was established ran from Vancouver, B.C. to Saint John, NB using VocalTec's Iphone. The link had many problems and was shut down in March of 1998 due to the numerous computer crashes and repeater lockups it was causing, and the lack of user control over the system.

David Cameron, VE7LTD set out to design a better way to use the same technology to perform the same task, while improving usability, user control, and sound quality. David's first breakthrough was to replace the existing operating system, Windows, with a more stable and versatile operating system. David chose, Linux, an open source form of the operating system UNIX designed by Linus Tovolds, because of its superior networking characteristics, its reliability, and its ease of programming.

David designed his own interface board to interface the radio to the computer. This allowed a large amount of delay to be removed from the system because two VOX circuits were no longer being used. David also wrote his own custom control software, and modified an existing voice-over-IP software package to accommodate the project.

The final product was a combination of hardware and software that created a nearly seamless radio link between two remote sites on the Internet. The product works so well that many people can not believe that they are talking through a link at all.

For more information about the history of Ham Radio and Voice-over-IP

Modes of Operation

There are two modes of IRLP operation

IRLP Operation

Using the IRLP

MAKING A DIRECT CONNECTION

    First of all listen to the repeater at least 15 - 30 seconds before transmitting and then ask if the repeater is currently in use. Assuming all is clear, identify your self. Example: "AB7C Accessing"- - Then enter the Node Number and release your PTT. The repeater should come up and with a carrier as it waits for the connection to be authenticated. This can take a few seconds, and have produce a few seconds of dead-air so don't be concerned. When the connection is confirmed, the voice ID of the destination node will be transmitted back to you as well as your nodes voice ID to the other repeater, announcing the connection.

NOTE: If the repeater is already connected to another node or reflector, a greeting will play saying: - "your node is currently connected to...ID of the connection"  In this case confirm if anyone desires the connection to remain up before dropping by using the OFF code ("73")...

    Once connected and after hearing the confirming voice ID, wait at least 5 seconds before transmitting as.....

--The repeater maybe in use, and your connection may have occurred in between transmissions.

--The voice ID of your node is longer than the voice ID of the other node you have connected to. The connection is not made until the ID is fully played on both repeaters.

--Their computer may be slower, and hence take longer to process the connection.

    Press the hold the microphone PTT for a second or two and then announce your presence and your intention such as you are calling someone specifically or just looking for a QSO with another ham in that city.

    If no response is heard, announce your call and your intent to drop the link and then touch-tone in the OFF code ("73"). Its not a good idea to transmit touch-tone commands (DTMF Tones) without first giving your call-sign. Not only is this courteous, it is a regulatory issue in some countries who may be connected to the reflector.

    Some nodes are configured so you configured so you cannot connect to them if that repeater is active. In this case you will receive the message: "The node you are calling is being used locally". If you receive this message wait 5 or 10 minutes and then try again.

    If you stay connected to a node and there is no activity on the repeater for 20 minutes, the connection will time out and automatically disconnect with a voice ID disconnect message on both nodes.

MAKING A CONNECTION TO A  REFLECTOR

    As above, listen to the repeater for local use for at least 15 - 30 seconds to insure the repeater is not in use. Assuming the repeater is not in use, announce your intention to connect to a Reflector before keying the ON command. When you hear the confirmation ID always WAIT at least 7 seconds before transmitting as you are most likely now connected with many repeaters and a QSO could be in progress. If after 7 seconds you hear nothing, identify yourself and indicate you are listening to the Reflector from. Example: "WA7ABC from Portland, Oregon". With the world wide IRLP activity the repeater has world wide coverage thus the suggestion to make a better detail of your QTH

    Don't be in a hurry to hear someone come back to you. You may have to do a bid of pleading from time-to-time to un-lodge someone from whatever they are currently involved with.

    If you hear or wish to engage in a conversation locally, out of courtesy to other node listeners, please disconnect the repeater from the reflector.

ERROR MESSAGES: connect with a node or reflector.  The most common ones are:

"The node you are calling is not responding, please try again later"
 This is caused by a loss of internet connectivity on one of the nodes.

"BEEP Error- The call attempt has timed out, the connection has been lost"
This error occurs when a node has loss of internet connectivity.  Some nodes such as in the UK use dial-up connections and then, only for short periods.  Also there may be temporary net or node problems.

"The node you are calling is being used locally"
The remote node is currently being used for a local QSO. Wait 5 to 10 minutes and try again. 

"The node you have called is Disabled"
This is caused when you attempt to call a node that is 'Offline'

"The Connection Has Been Lost"
If the internet connection drops while connected, this error message will be heard. 

 

COURTESY'S AND PROTOCOLS:

 More Information on IRLP:

 

Echolink

    EchoLink allows licensed Amateur Radio stations to communicate with one another over the Internet, using voice-over-IP (VoIP) technology.  The Echolink allows worldwide connections to be made between stations, or from computer to station, greatly enhancing Amateur Radio's communications capabilities.  There are more than 200,000 validated users worldwide — in 162 of the world's 193 nations — with about 4,000 online at any given time.

   

Using the Echolink

MAKING A CONNECTION

    Making an Echolink Connection is just like an IRLP connection just with a few minor differences. First of all listen to the repeater at least 15 - 30 seconds before transmitting and then ask if the repeater is currently in use. Assuming all is clear, identify your self. Example: "AB7C Accessing"- - Then enter the " * " (Star Key), plus the Station Number and release your PTT. The repeater should come up and with a carrier as it waits for the connection to be authenticated. This can take a few seconds, and have produce a few seconds of dead-air so don't be concerned. When the connection is confirmed, the voice ID of the destination Station will be transmitted back to you as well as your Station voice ID to the other repeater, announcing the connection.

NOTE: If the repeater is already connected to another station or conference, a greeting will play saying: - "your node is currently connected to...ID of the connection"  In this case confirm if anyone desires the connection to remain up before dropping by using the OFF code ("73")...

    Once connected and after hearing the confirming voice ID, wait at least 5 seconds before transmitting as.....

--The repeater maybe in use, and your connection may have occurred in between transmissions.

--The voice ID of your Station maybe longer than the voice ID of the other Station you have connected to. The connection is not made until the ID is fully played on both repeaters.

--Their computer may be slower, and hence take longer to process the connection.

    Press the hold the microphone PTT for a second or two and then announce your presence and your intention such as you are calling someone specifically or just looking for a QSO with another ham in that city.

    If no response is heard, announce your call and your intent to drop the link and then touch-tone in the OFF code ("73"). Its not a good idea to transmit touch-tone commands (DTMF Tones) without first giving your call-sign. Not only is this courteous, it is a regulatory issue in some countries who may be connected to the conference.


 

 

*Resources: www.irlp.net & Jon Andrews K1IMD