VHF Repeater Network

Repeater stations are a stand-alone receiver and transmitter.

The receiver receives transmissions on the repeater channel frequency and then re-transmits this through the transmitter. In essence repeaters are range extenders.

The nominal range of each repeater is 80km, but this will vary from repeater to repeater and it should also be noted that as VHF is essentially “line of sight”, some areas of coastline might be in a shadow zone. The repeater channels are what is known as “duplex”, in that the transmitting and receiving frequencies are different. This is different to the “simplex” channels, such as Channel 16 in which the transmitting and receiving frequencies are the same.

The repeaters are now used mainly for vessel to vessel communications as CH16, the international distress and calling channel, is monitored state-wide 24/7 by Tas Maritime Radio.  Some repeaters in the north of the state are sometimes monitored by volunteer radio stations.

MAST VHF Repeater Network

Accessing a repeater

The position of the closest repeater station to your vessel should be ascertained and the appropriate channel number selected on your VHF radio. It is essential that you check your unit is set to “international” as this ensures the duplex frequencies. It is then a matter of calling the desired receiving station, either another vessel or a coast radio station. You should be aware that the repeaters have a 30-second time out facility. This means that after 30 seconds of continual transmission they automatically switch off for a couple of seconds. They can be re activated by momentarily releasing the transmit key on your radio and then transmitting again. This facility is designed to stop people from over using the channel.

Benefits in using the repeater

As previously stated, some repeaters are monitored from shore by a few volunteer coastal radio stations. Hours of monitoring do vary from season to season but as a general rule they are monitored from 8am to 5pm daily. Some shore stations broadcast weather forecasts over the repeater frequencies and are also able to offer vessel position reporting whilst at sea. They can also be used as a secondary option for passing distress and urgency messages however all “Mayday” and “Pan Pan” calls should be made on Channel 16 the internationally recognized distress and calling channel. Only if you get no response on CH16 should you put out a distress call on a repeater channel.

Volunteer Coast Radio Stations

All coast radio stations in Tasmania are manned by volunteers and are self-funded.  Part of this self-funding is generated by annual donations of users of particular stations. This donation is in the vicinity of $20.00 and this is considered a cheap price for safety monitoring. If you make use of the repeater system on a regular basis, you might like to consider making such a donation

   
LocationChannel NumberMonitored by:
Maatsuyker Island82Not routinely monitored
Cape Sorell80Not routinely monitored
Bluff Hill Point81Smithton Radio
Dazzler Range80Not routinely monitored
Mount Horror82St Helens Marine Rescue
Cape Tourville80Not routinely monitored
Mt Raoul81Not routinely monitored
Three Hummock Island21Smithton Radio

VHF Repeaters in Tasmania and Bass Strait

Marine VHF Repeaters

AIS Marine Traffic Receiving Stations