The Australian amateur radio DMR repeater network

Category: News (page 1 of 5)

TG30-39 activated for JOTA

TG30-TG39 on slot 1 have been activated for JOTA stations.

The TGs are User Activated – i.e. you need to key (“kerchunk”) them up.

All have a hang time of 5 Seconds and a hold on time of 15 Seconds. This will allow users to connect and remain connected for a max of 15 Seconds after the last signal received by the IPSC2 servers. The timer starts once again after you key up, so to keep the TG active, make sure you rekey within 15 seconds.

Accessing TG8 from a hotspot

You can access TG8 on TS1 (used for regional QSOs) from a hotspot by using

TG x0008

where x is the TG8 region number.

Note that you are not restricted to the TG8 in your area – you can access them all if you want to.

Program the TGs as follows:

10008 = VK7

20008 = All Sydney, nth NSW and Orange 

30008 = HighRange, Goulburn, Yass, Bombala and Canberra

40008 = N VK3: Bendigo, Shepparton, Mt. Wombat, Rennies Hill

50008 = Melbourne and S VK3

60008 = VK4 (apart from FNQ)

80008 = Central Coast and Hunter Valley NSW

Welcome VK6RPN, north Perth

Welcome to VK6RPN, Singara north Perth.

438.275 -7

Thanks to Mark VK6QC and Peter VK3TE.

Welcome VK3RSU Mt. Waverley

Welcome to VK3RSU Mt. Waverley, SE Melbourne.

438.825 -7

Thanks to Peter VK3TE.

Newcastle city repeater freq change

Newcastle city repeater VK2RHX new frequency:

438.925 – 7MHz

The repeater is located at Strzelecki Lookout – formerly known as Shepherds Hill.

Welcome VK3RCQ Bendigo

Welcome to VK3RCQ Bendigo.

147.325 +0.6

Thanks to VK3WG and VK3TE

Maximising network efficiency

Slots and talk groups

One of the great advantages of DMR is its ability to support two simultaneous conversations on one repeater using Time Division Multiple Access (TDMA).  The two slot TDMA system is unique in amateur digital modes.

Our DMR network has many talk groups spread across the two slots.  Some of these are static – i.e. always on, and some are User Activated (UA) – they need to be keyed (“kerchunked”) up, and time out after a period of inactivity (normally 15 mins).

You can see the static groups on the IPSC server web page: http://rpt.vkdmr.com/ipsc/

The static groups are shown in the 5th and 8th columns alongside each repeater.

There are a lot of talk groups, and they can be confusing.  They are described at https://vkdmr.com/using-dmr/

Network loading

Although the network is quiet during the day, the user base has increased significantly (and continues to do so), so there will be occasions where there are two, sometimes three groups of users trying to use both time slots.

When user numbers were low, it didn’t really matter if you used a static talk group, but these days, a static group can hold up a time slot and make the network difficult to use for others. 

This is particularly the case with the State based 380x series talk groups on time slot 2.  If two stations are talking on, say, 3802, it locks the slot onto 3802 for all VK2 repeaters – other VK2 users are unable to use the main calling talk group – 505.

Whether you are accessing the network via a repeater or a hotspot, you should use talk groups that key up the minimum number of repeaters if you wish to chat with another station after QSY’ing off 505 – this will ensure that the maximum number of users can access the network.

If you are working a station on the same repeater, use TG9 on time slot 1 – this only keys the one repeater on one time slot.

If you are using two separate repeaters, switch to a UA talk group.  Most UA talk groups are on time slot 1, but there is one available on slot 2: TG3800.

As with all UA talk groups, TG3800 only connects the repeaters used in the contact – this keeps the other repeaters free on time slot 2 for stations to call on the main VK calling “channel”:  TG505.

UA “chat” talk groups are listed below:

TG53 TG3800

*3810 is intended for WICEN but is available for general use outside WICEN activities.

If possible, it is always handy to have the IPSC server web page running on a PC/tablet/phone – this gives you an overview of network activity.

TG5 on time slot 1 is a special case – it is intended for national broadcasts and nets, so is intentionally static.  It should not be used for other traffic.

Welcome VK4RJW Rockhampton

Welcome to VK4RJW Rockhampton.

438.8125 -7

Thanks to John VK4UE

Welcome VK2RCN mid north coast

Welcome to VK2RCN, Port Macquarie.

438.425 -5

Fills in a big hole on the NSW mid north coast.

Another repeater provided under the AR NSW Radnet project.


Thanks to AR NSW, Matt VK2FLY and the Oxley region ARC.

Welcome to VK3RYN Yallourn North

New VK3 repeater at Yallourn North has joined the network.

438.725 -7

Thanks to VK3AJ and VK3TE.

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