Echolink

Related Wiki pages: IRLP, D-Star

Introduction
Echolink is a VOIP (Voice Over IP) application that allows amateurs to connect to one another using the internet. It is similar to IRLP, but allows users to connect via either radio or computer. Application versions are available for PC and Mac computers. Echolink is not usually described as a digital mode - although VOIP is digital transmission of voice - as most operators will use an FM radio to connect to the echolink network.

VOIP connections of any sort - including Echolink - require a DSL connection to the internet. A minimum connection speed of 256KBs is usually recommended for effective, clear VOIP applications.

Using Echolink on a computer
As Echolink is an uses internet protocols for transmission of voice, various ports must be open in your firewall for it to operate properly, the Echolink website summarising the requirements thus:
 * Allow UDP destination ports 5198-5199 between Internet and PC in both directions
 * Allow TCP (source port any, destination port 5200) from PC to Internet

Because the firewalls only allow port directs to particular IP addresses - and hence computers - Echolink can in most cases only be used on one computer at a time in a particular household. Some ISP's may allow multiple unique external IP addresses, in which case echolink can be used on multiple computers.

The Echolink application presents a window such as the one below to the user.



The user selects a contact from the list and communication is carried out using the computer microphone.

Using Echolink via a radio
Step by step process


 * Look here to find out which nodes are available and where they are located. This list is updated regularly, and gives information about which nodes are connected to each other. If you use Google Earth, this kmz file will show you the connections between Echolink nodes.


 * Locate a node close to you and one that you would like to contact. Repeater listings such as this one for Australia, will provide useful information in your search.


 * Use a DTMF microphone and dial in the node number that you wish to contact. A message will tell you if you either are successful or unsuccessful.


 * There will be a delay between sending and receiving when using Echolink or IRLP. Best protocol is to wait a couple of seconds between hearing the other person and starting to talk yourself.


 * When you have finished talking, use the DTMF buttons and dial in 73. This will disconnect the nodes.

Getting Help
The Echolink community provides a number of forums for users to get assistance:
 * Echolink support page
 * Echolink Help files These are available in PDF.
 * Yahoo group for echolink users