WARNING : Due to recent renumbering of talkgroups, the new talkgroup for Corsica is now 20820. The previous TG 20821 is left available for French department 21. The 20820 TG was previously used for emergency QSOs. Those should normally have moved to 2080.
Corsica has its own XLX755 digital multi-protocol reflector, hosted into the TKNet data center in Ajaccio.
It accepts D-Star and DMR incoming connections, and has its own AMBE transcoding server. It’s the central connection point for all the digital repeaters of the island.
It also have inter-connections with :
- Several XLX interlink peers
- D-Star France XLX933 / DCS033 (modules A, C, K, W)
- Brandmeister France (New TG 20820 to module K)
Available communication modules are :
- A : XLX international
- B : XLX France
- C : D-Star France (XLX933 C)
- D : XLX French-speaking (F, VE)
- K : Corsica (All repeaters of the island + XLX933 C + BM 20820)
- W : French Open Network (XLX933W, BM282229)
An additional gateway with our analog repeater network (Asterisk) is under development.
Dashboard is available at :
TKNet team is working on migrating the network to AMPRNet / HamNet public IP addressing. The subnet corresponding to the whole island of Corsica will be announced directly in BGP from our data centers of Ajaccio and Bastia. Two central firewalls will control traffic inside TKNet, but also from/to the outside of the world, in order to respect local regulations. The use of public IP addressing will facilitate the operation of D-Star and DMR digital repeaters, because it won’t be necessary to use dual-addressing or address translations anymore. Moreover, local announcement in BGP will ensure lower latency for VoIP flows with our D-Star and DMR partners. Our TKBox system (OpenWRT / OpenVPN) will remain unchanged, and will facilitate “Plug and Play” connections of remote sites and end-users (compared to old AMPRNet techniques such as IP-IP and modded ripd).
This project is under heavy work in our labs, with the help of many other people involved in France and in the world. Please be patient 🙂
TKBox Mini is based on a TP-Link WR710N router. It’s very compact, and has only one Ethernet LAN port. It’s best suited for use on “low-points” to drive a 5 GHz link, or in locations where discretion is required (Internet access hosted by a third-party).
Features are nearly the same as TKBox Standard, which has a bigger enclosure, more LAN ports, and more memory for OpenWRT additional software.
The TKBox is a router running the free operating system OpenWRT. You can connect it behind any Internet access (whatever the operator, whatever the technology : fiber, xDSL, cable, satellite…). The TKBox establishes a connection to the TKNet core via an OpenVPN tunnel. You do not need to have a fixed IP address, and you do not need any special configuration on your Internet box (ie, “port openings”). Connection is fully “Plug and Play”.
Every TKBox uses a dedicated subnet in the TKNet addressing space (10.44.x.y). Every machine connected behind a TKBox can talk with any other machine in any other TKNet location. Thus, two high points connected to TKNet can communicate with each other.
A TKBox can also provide a tiny local WiFi network, with SSID “TKNET”. Any client (PC or smartphone) is automatically connected to the network.
TKNet network uses a “star” or “Hub and Spoke” topology : every TKBox connects to a central gateway located in Ajaccio, and this gateway does the routing job between remote sites. A second gateway is being installed in Bastia, so that the network and routing is fully redundant.
Basically, a TKBox is a low cost commercial router which has been re-flashed with the free open-source operating system OpenWRT. It uses OpenVPN for tunneling to the gateways, and OSPF as a dynamic routing protocol.
Our current model, called TKBox Standard, is based on a TP-Link WR1043ND router. It has 4 LAN Ethernet ports, one WAN port, and external WiFi 2.4 GHz antennas. It’s best suited for a QRA or a high point.
We also use an ultra-compact model, called TKBox Mini .
PS: It’s possible to use any other hardware compatible with OpenWRT. TKNet specifications only involve coordinated IP addressing, special OpenVPN settings for VPN Pass-Through, and OSPF for routing.
Our high points being connected in IP, we installed an ADS-B aircraft position receiver. It receives beacons transmitted by the aircrafts on 1090 MHz, and sends them to the site FlightRadar24.com. There, it’s possible to follow positions of aircrafts in real time.
The callsign of the “radar” is F-LFKJ2. It’s installed on the high point of Coti-Chjavari, over the bay of Ajaccio
To follow aircraft traffic over Corsica :
To know more about how the system works, click here.
TKNet network, and this WEB site, are maintained by :
TK5KP – Radio Club d’Ajaccio
Terra rossa – Le pinson D1
The “Association des Radioamateurs de la Corse du Sud” is a non-profit association of type “law 1901”. It’s a member of the “Réseau des Emetteurs Français”, which is an Association of Public Utility.
President : Patrick EGLOFF (TK5EP)
Vice-president : Alexandre PELLEGRINETTI (TK5NJ)
Secretary : Toussaint OTTAVI (TK1BI)
Treasurer : Raymond VILLENEUVE (TK5DG)
Bureau members : François MILANO (TK5AE), Jean-François ORSONI (TK0NL)
Our general-purpose WEB site is available at :
We choosed Asterisk as the central element of our system. Asterisk is a free and open-source software that was originally built for enterprise telephony systems. A team of developers wrote a driver to connect an analog repeater to Asterisk. It’s called app_rpt. It’s widely used in the US, where there is a national network of Asterisk analog repeaters (AllStar). But it can also be used to build standalone systems. That’s why we choosed Asterisk / app_rpt for building a radioamateur VoIP network on our island.
The system is composed of
- A central hub (TKNet-VoIP) : This is Asterisk software, running on a virtual server in the data center. The hub is the central node of the VoIP. All remote VoIP systems (VHF/UHF repeaters) connect to the hub.
- Several VHF/UHF analog repeaters : Each repeater is composed of an receiver, a transmitter, an USB sound card, and a Raspberry Pi running Linux, Asterisk and app_rpt. Each repeater can work in standalone mode, or can be connected to the hub.
- An Echolink gateway (TK5KP-R) : Internet users can connect to the TK5KP-R Echolink entry point. If it is connected to the hub, Echolink users can be heard on any repeater also connected to the hub.
Connections between Asterisk nodes are using Asterisk native protocol (IAX2) over TCP/IP on TKNet. As it is a “closed” network, traffic is never transmitted to Internet, and no Internet user can connect to it.
There are other ways to connect to TKNet-VoIP :
- Android “IaxRPT” application : This dedicated app can connect to the hub from any Android smartphone. An OpenVPN Android client (with valid authentication) is required.
- Any VoIP application : Any VoIP application (initially designed for remote access to business telephony systems) can be used from any smartphone (Android or Apple). Some succesful tests have been made using Zoiper Android app. An OpenVPN client is also required to enter TKNet.
Thys system has the advantage of using only standard protocols (IAX2, SIP). Most of the software are also free and open-source. HAM network manager has full freedom about what he can do, and how he wants to build his network. No agreement from any third-party business or group is required.
Interconnections are also being developped between Asterisk (Analog) and pure digital systems (D-Star, DMR, etc…). More to follow…