Internet and RoIP Links to the SMLRS

The SMLRS is a unique system.  Its robustness and system reliability stem from high quality system components and true RF links.  However, the system designers realize that today there is also a need for linking into the system via the Internet and RoIP protocols.

The first protocol is for listen only via the Internet.  By visiting http://www.radioreference.com/apps/audio/?ctid=1517, you can monitor online.  When you arrive at this page, scroll down to the link titled “Southwest Missouri Linked Repeater System”.  Select from the dropdown menu the media player you wish to use.  Options such as web player, java web player, windows media player, iTunes, Real player and Winamp are available options.  Then, click on the speaker icon in the “listen online” column and the chosen player will open and you will be able to monitor SMLRS traffic for as long as you want or need.

The second IP protocol is the Internet Radio Linking Project, also called IRLP.  The Crane UHF hub repeater for the SMLRS has an IRLP node installed.  Any radio traffic on the SMLRS is re-transmitted out on the IRLP node.  The SMLRS IRLP node # 7191 is not used for on-demand, casual linking.   It is designed for specific linking during severe weather, training nets and other emergency communications only.  It is tested at least weekly during system nets.  The IRLP node is normally connected to reflector 9336 and is utilized to link to the Nixa ARC repeater network, see http://www.nixahams.net, for the Thursday night NARC net at 7:30 p.m.  The IRLP node and associated Missouri Reflector system allows for back-up communications from Pleasant Hill Weather, and other National Weather Service offices equipped with an IRLP node.  System administrators and net control operators have the ability to link the system up to a particular reflector when needed.  During severe weather or other emergency situations, the node will link up to reflector channel 9333 dedicated for Southern Missouri SkyWarn / Emergency linking.  Any station with an IRLP node is welcome to link to that channel.  If you have a simplex node at your residence, it is recommended you connect to 9333 in listen only mode unless the node is located in an area where SMLRS does not provide adequate coverage for a station needing to make a report to the net in operation.  If you would like to have an official IRLP connection into the system, please contact system administrators at smlrs@gmail.com.  For more information on IRLP, please visit www.irlp.net.

The third RoIP mode begins our move into the public service realm.  It is not a device that amateur operators use for IP communications.  All radio traffic from any SMLRS repeater is transmitted out onto the system NXU-2A.  The 147.015 repeater is equipped with the system JPS NXU-2A.  These devices allow for a 1 to 1 connection unless otherwise programmed.  An emergency communications center or mobile command center equipped with a dynamic or static IP and an NXU-2A will be able to connect to the SMLRS system with the proper IP information.  There is also a PC client version, called PC NXU that can be obtained from JPS.  This software allows a person with a laptop PC and a microphone to connect to the NXU-2A at the 147.015 site and connect to the system as if they were using a radio or another NXU-2A.   More information about the NXU-2A can be found at http://www.raytheon.com/capabilities/products/nxu_2a/.  If your agency would like to establish a connection via this method, please contact one of our system administrators.

Lastly, the SMLRS is connected to the MoSWIN statewide radio system at the Granby KM0HP 145.390 repeater site via an RoIP connection.  Any dispatch console on the system can have the icon placed on their radio dispatch console.  Troop D HQ in Springfield is currently equipped to monitor and access the system as needed.  Only licensed amateurs are allowed to transmit on this icon, but anyone may listen.  This allows dispatchers or radio operators that are licensed amateurs to participate in nets, SkyWarn, or other emergency nets in which amateurs are providing emergency communications with equipment they are familiar with and not a radio that they may have never used.  This also allows amateurs to go to a served agency and send and receive data from the SMLRS from local ARES, RACES, etc. groups without that agency having amateur gear installed at their facility.

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