|VK2CJC-L Gateway Status: Gateway online|
I run a TETRA UHF gateway here in Brisbane for anyone in the amateur community to use. You can talk to others around the globe both on TETRA and Echolink via the gateway.
(note: This gateway was relocated from Sydney to Brisbane).
VK2CJC-L covers the North Eastern side of Brisbane, out towards the airport.
The gateway transmits at a maximum of 10 watts, utilising an omni-directional antenna mounted 10 meters above the ground.
Below are computer-generated maps (from ve2dbe’s mobile online mapping tool) showing expected coverage from the gateway with the receiving radio located 1 meter above the ground.
Green represents where you should receive coverage. Yellow area represents where you may receive coverage.
Coverage issues? Let me know: Contact Me
Accessing the gateway
To use the TETRA gateway, you must use a TETRA UHF radio that’s capable of transmitting and receiving on 439.250 in DMO mode.
|Callsign||VK2CJC-L (appears as EL-VK2CJC on aprs.fi)|
Gateway Idents every 60 minutes on the hour
|Tetra Details||MCC: 901|
ISSI: Your DMR ID
|Timeout||180 seconds (3 minutes)|
|Echolink||Node 475538 (VK2JC-L)|
To have your TETRA radio location appear on aprs.fi, submit your DMR ID, name and location via the Contact me form.
The TETRA gateway is linked to the internet via SVXLink to a global network of Tetra Repeaters in other countries, and to Echolink. There are a number of talk groups available within the system.
You can view the current Tetra System Dashboard here: VK TETRA Dashboard
By default, the gateway listens on TG 505 (Australia). If someone changes the talk group to something other than 505 and no audio is transmitted or received after 30 seconds the gateway will revert back to TG 505.
Additional talk groups are available. You can see the list of available talkgroups on the Talkgroups page
The gateway runs using two Tetra Radios: A link radio to provide connectivity to the broader network, and a higher powered radio to provide the local coverage.
I’m using a Motorola MTM800e as the link radio. This radio is connected to a Raspberry Pi 3B running SVXLINK via a 3.3volt FTDI (RS232 to USB) cable for data and PTT control. The radio is also connected to a Signalink for send/receive audio to/from the Pi to send/receive audio to SVXLINK and then out to the broader internet network. The 20 pins at the rear of the MTM800e make it super simple to pull audio and data from the radio and send it to the Pi.
This radio is only capable of transmitting at up to 3 watts, and therefore is more suited to acting as a link radio, rather than attempting to use it to provide broader coverage locally here in Brisbane.
Local gateway radio
The local gateway radio is a Sepura SRG3900. This radio is capable of transmitting at up to 10 watts, which provides increased coverage across the north eastern side of Brisbane.
I also run the reflector for all talk groups starting with 505. The reflector is a connection point for any other gateways on the system that wish to communicate on talk group 505. This currently runs on a linux server hosted in Azure.