K4IJ Repeater - IRLP Node 8226 - Blacksburg/Roanoke Virginia

We are proud to be able to offer our repeater users another Voice Over IP system called IRLP. The Internet Radio Linking Project was developed by Dave Cameron VE7LTD. It allows users to connect to other repeaters around the country and world. It is very similar to EchoLink with one exception, it does not allow computer users to access the system.

The Poor Mountain 441.775/446.775 repeater is the central hub for the Three Dog system. IRLP as well as EchoLink therefore can be used on any repeater in the system since both are linked to the hub.

If you would like the access codes, please send Mike Knight K4IJ an email at the address below.Please do not share the access codes of either system over the air. If you hear someone who wants to use the systems please help them by entering the codes yourself.

Mike Knight K4IJ and Mike Howery K4XE are the node administrators for the Three Dog Repeater Group. Any questions or comments can be directed to either one of the administrators. Please contact Mike K4IJ k4ij at verizon dot net.

IRLP USER GUIDE

Two modes for IRLP connections
 
IRLP allows users to link repeaters via a internet connection.  There are two connection modes for an IRLP connection -- Direct one-to-one, and one-to-many via a Reflector.  You must use a radio to access IRLP -- you cannot connect directly from the internet or without an FCC amateur radio license. 

 

Direct or "Point-to-Point"

In direct connections node "A" connects directly to node "B". While "A" and "B" are connected, anyone attempting to connect to either node will hear a  recording saying "The node you are calling is currently connected to _______". Three Dog Repeater Group users can bring up point-to-point connections on any RF linked repeater.  At times you may find our UHF linked repeaters connected to the East Coast Reflector 9210 for special events or emergency coordination. Direct Access may then be disabled. Further questions about support of the project can be directed to Mike Knight K4IJ or Mike Howery K4XE.
Via Reflector

A reflector is a Linux computer that connects many nodes (repeaters) by streaming received audio back. Reflectors provide a common meeting place where more than two nodes at a time can connect and be heard by all participating.  At any given time there are usually 10 or more repeaters around the world interconnected via the Reflector.  FYI, you can check who is connected to the reflector by visiting status.irlp.net and looking for nodes connected to the Reflector. 


 

Talking on IRLP
 
Before you communicate using IRLP please familiarize yourself with how using IRLP differs from using conventional repeaters. 

The most important guideline to remember is to leave a 2 second pause after pressing the PTT button as well as between transmissions.  Just as with any linking system, the IRLP is subject to some audio delays. These delays are caused by the amount of time digital information can take to be compressed and travel across the internet between the nodes and PL decoder boards on all of the participating repeaters. So the first thing to remember is to slow down and be patient. When in a conversation, remember to leave a second of dead air before speaking. Due to the timing issues with the system some nodes may require a longer period.  By leaving a pause between transmissions you 

  • allow users on other nodes a chance to check in
  • allow other nodes time to send touch-tone commands to drop their node

Here is a quick summary of DO'S and DON'TS: 

  • DO pause between transmissions to allow for control codes and to let others in.
  • DO hold your microphone PTT for about 2 seconds before talking to allow all systems time to rise.
  • DO NOT rag-chew on your local repeater while connected to the Reflector.
  • DO pause for 15 seconds after connecting to a Reflector to see if other stations are already talking.
  • DO identify before sending DTMF command tones (and make sure your signal is good enough that you can reliably bring down any connection that you initiate).
  • DO NOT discuss up/down codes on the air -- please refer people who want information to a control op.
  • Remember: anything you do on an IRLP reflector can be heard on the participating linked repeaters around the world.
Making a direct connection
 
Initiating an IRLP connection is very similar to using an auto patch.  First of all, LISTEN on the repeater before transmitting and then ask if the repeater is currently in use.  Assuming all is clear, identify yourself and say what you are doing.  Example:  "KG4xyz bringing up Node 1000" - - then enter the ON code for the node and release your PTT. When the connection is completed the voice ID of the destination node will be transmitted back to you as well as your node's voice ID to the other repeater. 

NOTE: If the your repeater or the destination repeater is already connected, a message will play to tell you so. 

After entering codes to bring up a connection you should hear a carrier as the repeater waits for the connection to be established.  This can take a few seconds of dead-air so don't be concerned. 

2. After hearing the voice ID confirming the connection is established, be sure to listen at 
least  15 seconds as: 

  • A QSO could already be in progress.
  • The voice ID of your node is longer than the voice ID of their node, and the connection is not made until the ID is fully played.
  • Their computer may be slower, and hence take longer to process the connection than yours.

3. When you hear the confirmation ID always WAIT at least 15 seconds before transmitting as a QSO could be in progress.  Press and hold the microphone PTT and wait for a second before announcing your presence.  Are you calling someone specifically or just looking for a QSO with another ham in that city? 

4. If no response is heard, announce your call and your intent to drop the link and then touch tone in the OFF code.  It is not a good idea to transmit touch-tone commands without first giving your call-sign.  Not only is this courteous it may be a regulatory issue in the country to which you connected. 

TIMEOUT: Should you stay connected node-to-node and there is no activity for 5 minutes, the connection will time out and automatically disconnect providing voice IDs to both nodes that the other node is disconnecting.


Connecting to a reflector
 
Reflectors are set up to only allow ONE person to talk at any given time. Unlike repeaters, the reflector will NOT mix audio but instead will allow the first person who talks to continue talking until they are finished. So there is no point in trying to talk overtop of another node, as you will not be heard.  Keep this in mind while using reflectors that due to the delay in the system, you should always leave about 2 seconds between transmissions to ensure that any priority traffic has the chance to talk. Also, if you are not getting through, don’t continue to try every transmission, but instead try to wait for a natural break in the conversation. 

1. As above, listen to the local machine and then announce your intention to connect to another node before keying the link on command. 

2. After hearing the voice ID confirming the connection is established, be sure to listen at least 15 seconds as: 

  • You are most likely now connected with many repeaters and a QSO could be in progress.
  • The voice ID of your node is longer than the voice ID of their node, and the connection is not made until the ID is fully played.
  • Their computer may be slower, and hence take longer to process the connection than yours.

3. If after 15 seconds you hear nothing, identify yourself and indicate you are listening to the Reflector from "City and State". With the world-wide IRLP activity the repeater now has world wide coverage thus the suggestion to better detail your QTH. 

4. Don't be in a hurry to hear someone come back to you.  You may have to do a bit of pleading from time to time to un-lodge someone from whatever they are currently doing. It is not unusual for repeaters with minimal traffic to stay connected to the Reflector for extended periods of time. 

Out of courtesy to others who may want to use the reflector, please do not engage in a prolonged rag-chew (move ragchews to node-to-node connections). 

Participating in Reflector Roundtables

Roundtables are conversations involving more than 2 parties.  Unlike a net a roundtable requires some organization to keep the conversation thread passing in an orderly fashion from party to party.   Do not become intimidated if a group grows and, if mobile, do not be overly concerned if you are unable to remember all or any callsigns.  Just try and remember the call and or name of the next station that you pass it to.  If you are listening and wish to break into a conversation, let a cycle go by so you know the participating station are then announce your callsign during one of the "pauses". You should be recognized and then when finished with your transmission be sure to specify who you are turning it over to.  If you do not specify a station to pick up the connection chaos will result as 2 or more stations may try to talk at once.
 

Error messages
 
From time-to-time you may receive error messages when attempting to 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 to one end of the call attempt.
  • "BEEP Error- The call attempt has timed out, the connection has been lost" -- This error occurs when a node is OFF-LINE or there is a software error.  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 Connection Has Been Lost" -- If the internet connection drops, this error message will be heard. 

IRLP nets
 
The IRLP International Net is a good opportunity to meet many others from around the IRLP network. To participate in the net there must be a local net controller for your node otherwise you will only be permitted to monitor. It is also required that the users of the net follow strict guidelines to ensure that the net flows in a timely matter. 
  • Do not connect your local node to the net during net times unless someone is acting as a local net controller.
  • Do not make calls directly to other stations during the net.
  • Above all NO local conversations during the net while connected to the reflector.
  • Do not attempt a call unless your local net controller has you as a pre check-in.
  • Disconnect our node if any local interference is present.
  • Keep your check-in short and to the point. Remember that several hundred others may be waiting for a chance to check-in as well.

The IRLP International net is a way for all hams in all areas of the world to be hear and be heard. Let's keep the net viable with proper operation.  Check the Official IRLP Net web page for details on schedules.

A global map of IRLP nodes is available here .