This is the UK portal for SVXlink nodes and repeaters that currently subscribe to the network. It may appear confusing but I will attempt to describe what is taking place with SVXlink.

Over several years SVXlink nodes have been joining the EchoLink network with a Linux flavour. Developed by Tobias SM0SVX, the practical developments have meant that EchoLink is only a small part of the package. The development of digital radio has also introduced a module to transcode from analogue to several of the digital mode available, but the first step was to create a network of analogue nodes to improve the throughput of repeaters, that have increasingly become less used.

The modules that are already included in the SVXlink package are SVXlink that permits a stand-alone node either simplex or duplex, RemoteTrx that permits expansion of a local node with remote Transmitters and/or Receivers, and SVXReflector that permits remote nodes and repeaters to interact.

SVXReflector has already been in use for some time in Sweden, Germany and France with the first protocol. In France the national network has over 180 nodes in a network.

The new protocol now permits interaction in multiple groups using talkgroups. You will see these groups displayed in the dashboard above. It is no coincidence that these groups are based around the existing talkgroup structure for DMR, the most used digital mode. Future expansion will probably involve a form of connectivity to the digital world.

It can be seen from the dashboard designed by Peter SA2BLV, that each repeater or node can be unaffected by the connections to another, and can be used quite normally in a local fashion. If a user wishes to connect to the UK group of repeaters that have chosen 235 on which to listen, then he sends a DTMF sequence 91235#. The node will respond and declare the talkgroup available. The next transmission will wake all the other nodes listening to 235. At the end of all transmissions, the distant and local nodes will return to talkgroup 0, the default. Only those nodes with 235 will be affected. Meanwhile another user could activate talkgroup 240 and have a conversation independently.

Another scenario might exist, where the sysops of repeaters could select to have 235 permanently on as a default. So all those repeaters would be live in a network from the start. To go ‘local’ users of one repeater key up 910# to disconnect from the wider network. At the end of the communication, the repeater would return to default 235.

One interesting aspect to this dashboard, is that Adrian VK4TUX has permitted talkgroup 505 to be used, that although not on the ‘static’ list, can still be called by 91505#. On this network you will join a digital network on Tetra, that is to say a digital mode using QuadTDMA. (Time Division Multiplex) similar to DMR except with four slots instead of two. More development is anticipated soon.

To build a simplex node is not difficult, and to change a current repeater to SVXLink is even easier. If help is required in all the aspects of software and hardware you only have to ask.

An article on an SVXlink build can already be found on this site. It will soon be supplemented by an instruction page on how to join the reflector and the portal.

One thought on “SVXPortal and what it could mean for analogue repeaters.”
  1. Nice work, Chris!
    Here in Sweden, we have a growing network of about 30 nodes, with almost 40 repeaters. I say this, not to brag, but to prove that the system is indeed scalable. Our portal is at https://svxportal.sm2ampr.net .
    I’m struggling a bit, trying to prove that it is indeed simple to use. Because it is. There can be many commands and functions, but keep in mind that you don’t need to learn everything at once. In fact, to use a SvxLink repeater, you don’t need to know anything really. Just press your PTT and talk!
    On the website of one of our repeaters, SK7RFL (www.sk7rfl.se), I have also created a “Repeater School”. Well, it’s in Swedish, but you might try to use Google Translate :-). Just to get a feel of how one can present all the functions in SvxLink in a easy to understand way.
    I have also published a couple of articles in the Swedish magazine “QTC”, and they are now also available in English. They can be downloaded from SK7RFL.se->Start->In English (at the very bottom of that page).
    If you wonder, some of the nodes I’m involved in are connected to both networks. In the future, it would be nice to have some “federation” connection between SvxReflectors. But for now, I’m connected to both. Bridging through a single node is possible, but a bit risky.

Leave a Reply