The Tasmanian Government Radio Network (TasGRN) is Tasmania's statewide digital radio network for emergency services, government agencies, land managers and essential infrastructure operators. For radio enthusiasts and scanners users, TasGRN represents one of the biggest changes to Tasmania's radio landscape in decades.
What is the TasGRN?
TasGRN was developed to replace a number of separate, ageing radio networks with a single statewide communications platform.
The network brings together organisations including:
- Tasmania Police (Encrypted)
- Tasmania Fire Service (Encrypted)
- Ambulance Tasmania (Encrypted)
- State Emergency Service (Encrypted)
- Parks and Wildlife Service
- Sustainable Timber Tasmania
- TasNetworks
- Hydro Tasmania
The original project was designed around a P25 digital radio network, providing greater interoperability between agencies, improved coverage and secure communications.
The network is operated under a long-term arrangement involving Telstra and Motorola Solutions. By 2025, the network had expanded to around 400 sites across Tasmania.
What does it mean for scanner users?
TasGRN is quite different from the older analogue VHF systems that many Tasmanian listeners grew up monitoring. Instead of simply programming a list of frequencies and listening to individual channels, a trunked P25 system dynamically assigns radio resources to different talkgroups. A scanner monitoring the system therefore needs to understand the trunking information being transmitted by the network.
For the listener, the important things to identify are:
Site – the particular TasGRN radio site being received.
Control channel – the channel carrying the information that tells radios where communications are taking place.
Talkgroup – a logical channel used by a particular agency, operational group or function.
Radio traffic – the actual voice or data transmission taking place.
This means that two listeners in different parts of Tasmania may receive quite different TasGRN traffic, even though they are monitoring the same network.
Encryption
One of the biggest changes with TasGRN is the use of encrypted communications.
Tasmania Police publicly described TasGRN as an encrypted network during the early-access trials, with security being one of the major objectives of the new system.
This has a major impact on scanning.
A digital scanner may be able to detect the presence of a transmission, identify the site or talkgroup information, and record other network activity, but encrypted voice cannot simply be decoded by a normal scanner or any radio, other than a properly programmed TasGRN radio.
For monitoring purposes, it is therefore useful to distinguish between:
- What the scanner can technically receive
- What information is transmitted
- Whether the voice traffic is encrypted
- Whether the traffic is actually intelligible to the listener
An encrypted transmission is still an interesting RF signal even when the audio itself cannot be monitored.
Why TasGRN is interesting to radio monitors
TasGRN provides a large statewide radio system to explore.
Rather than concentrating solely on listening to conversations, monitoring the network can involve looking at:
- Radio sites and coverage
- Control-channel activity
- Talkgroup activity
- Site identification
- Signal strength
- Network changes
- New or retired sites
- Agency activity
- Propagation conditions
- System behaviour during major incidents
For the serious scanner enthusiast, the network itself can be as interesting as the voice traffic.
Monitoring TasGRN
A modern digital trunking scanner is the easiest way to monitor an accessible portion of TasGRN.
Equipment capable of receiving P25 trunked systems can be used to investigate the network, although the ability to receive a signal does not mean that encrypted voice can be understood. Software-defined radio can also be useful for analysing the RF side of the network and understanding how sites and control channels operate.
The most useful approach is often to combine a scanner with a logging database. Recording the date, time, frequency, site, talkgroup and observations makes it possible to build up a picture of how the network operates in different parts of Tasmania.
The TasGRN transition
TasGRN was not switched on overnight. Agencies transitioned from several older networks to the new system progressively.
The project replaced a mixture of existing digital and analogue systems, including the former Trunk Mobile Radio Network (EDACS) and several VHF networks.
The transition has also continued to involve network expansion and infrastructure work. New and upgraded sites remain relevant to monitoring because Tasmania's terrain makes radio coverage particularly challenging.
What can you actually hear?
This is the important distinction for anyone getting into TasGRN: You may be able to receive the network without being able to listen to its voice traffic.
Some transmissions or network information may be observable, while protected operational communications remain inaccessible to ordinary monitoring equipment.
That doesn't make the system uninteresting. For a radio enthusiast, TasGRN can be treated as a large RF experiment: find the sites, identify the control channels, observe activity, compare coverage and document how the network behaves around Tasmania.
A different kind of scanning
Traditional scanning was often about:
"What frequency is the police using?"
Modern trunked-system monitoring is increasingly about:
"What network am I receiving, which site am I hearing, what talkgroups are active, and what can I learn from the signals?"
TasGRN is a good example of that change. For Tasmanian scanner enthusiasts, the network provides plenty to investigate even where the actual voice traffic is mostly encrypted.
TASGRN Sites: Updated 22/09/2206

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