For many amateur radio operators, repeaters are the easiest and most reliable way to make local and regional contacts. A handheld radio, mobile rig or modest home station can suddenly reach much further when it can access a well-located repeater. In the south of Ireland, one of the best examples of this is the Southern Ireland Repeater Network, often referred to as SIRN.

The network is important because it links a number of repeaters together, allowing a transmission into one repeater to be heard through others on the network. This greatly extends the practical coverage available to operators and helps keep VHF and UHF activity alive across the southern half of the country.

What Is the Southern Ireland Repeater Network?

The Southern Ireland Repeater Network is a linked analogue repeater system serving much of the southern half of Ireland. The Irish Radio Transmitters Society lists the repeaters that make up the Southern Ireland Repeater Network and notes that the keepers are EI8JA/EI3JE. The IRTS also notes that IRLP node 5883 is accessible on all repeaters on the network.

The Southern Ireland Repeater Group says it was formed in 2016 to take over ownership and operation of the repeater network from the South Eastern Amateur Radio and East Cork Radio Groups. It describes the network as a set of RF-linked analogue repeaters in the southern half of the country, now standing at eight repeaters.

In simple terms, SIRN helps radio amateurs in different counties talk to one another more easily using ordinary FM voice equipment.

Why Linked Repeaters Matter

A normal repeater receives your signal and retransmits it over its own coverage area. That is useful, but it is still limited to the area covered by that repeater.

A linked repeater network goes further. If several repeaters are connected, a signal going into one site can be carried across the network and retransmitted from other sites. This means an operator in one county may be heard by operators in several other counties, depending on which repeaters are active and linked at the time.

For beginners, this is very useful. It means you may be able to hear more activity, join more conversations and make contacts beyond your immediate local area.

Where Are the Repeaters?

The SIRN repeater list includes a mix of 2 metre and 70 centimetre repeaters at important high or strategic sites across the south of Ireland. The published network information includes, among others, 2 metre repeaters at Helvick Head, Co. Waterford, Devil’s Bit, Co. Tipperary, and Listerlin, Co. Kilkenny, as well as 70 centimetre repeaters at Mount Leinster, Co. Carlow, Carrickphierish, Waterford City, and Farmers Cross, Cork City.

For Kildare operators, the Mount Leinster and Devil’s Bit sites are particularly interesting because elevated sites can sometimes be heard over surprisingly wide areas, especially with a good external antenna. RepeaterBook describes the Mount Leinster 70 cm repeater as covering much of the south east and into the Midlands.

SIRN and Weekly Radio News

The network is also used for amateur radio news and call-ins. The South Eastern Amateur Radio Group states that members of EI2WRC transmit the weekly IRTS radio news bulletin at 8.00 p.m. local time every Tuesday via the Southern Ireland Repeater Network, DMR Talkgroup 27240, EchoLink Node 225431, IRLP Node 5883 and other linked options. A report call-in net is held directly after the news broadcast.

This type of regular activity is valuable. It gives operators a predictable time to listen, call in, test equipment and stay connected with what is happening in amateur radio across Ireland.

How Do You Use the Network?

Using SIRN is similar to using any analogue FM repeater, but you need the correct settings for the repeater you are trying to access.

Normally you need:

• The repeater output frequency
• The correct input offset
• The correct CTCSS access tone, if required
• FM mode
• A suitable antenna
• A valid amateur radio licence before transmitting

For example, the published SIRN information lists EI2DBR at Devil’s Bit with an output of 145.650 MHz, input of 145.050 MHz, a -0.6 MHz shift, and 103.5 Hz access tone. It also lists EI7MLR at Mount Leinster with an output of 430.950 MHz, input of 438.550 MHz, a +7.6 MHz shift, and 156.7 Hz access tone.

Always check the latest frequency and access information before programming your radio, as repeater details can change over time.

Good Operating Practice

Because a linked repeater network can cover a large area, good operating practice is especially important. When you transmit through one SIRN repeater, your audio may be heard across multiple linked sites. That means you are not just using a local channel; you may be occupying a much wider network.

Good practice includes:

• Listen before transmitting.
• Leave a short gap between overs.
• Use your call sign clearly.
• Keep transmissions reasonably concise.
• Avoid repeatedly keying up without identifying.
• Give priority to urgent or emergency traffic.
• Be welcoming to new operators.
• Do not monopolise the network for long periods.

A linked system works best when everyone uses it with courtesy and awareness.

Why SIRN Is Useful for Beginners

For a new operator, SIRN can be a great confidence-builder. If you can access one of the network repeaters, you may be able to hear regular users, news bulletins, call-ins and casual contacts from a wide area.

It helps beginners practise:

• Programming repeater memories
• Using CTCSS tones
• Understanding offsets
• Giving signal reports
• Joining nets
• Listening before calling
• Speaking clearly on FM
• Learning repeater etiquette

A beginner with a handheld may struggle indoors, but performance can improve significantly with an outdoor antenna, a better whip, a mobile antenna or operation from higher ground.

Why SIRN Matters to Kildare Operators

Although Kildare is not always thought of as part of the deep south, Kildare operators may still benefit from the network depending on location, antenna and conditions. Sites such as Mount Leinster and Devil’s Bit may be worth testing from higher or more open areas in the county.

For members of Kildare Amateur Radio Club, SIRN is also useful as an example of how repeater infrastructure supports amateur radio community life. It shows the importance of volunteers, maintenance, technical knowledge, site access, linking systems and regular on-air activity.

It can also be a good topic for a club demonstration: programme a few radios, test which repeaters are reachable from different parts of Kildare, and compare handheld, mobile and base antennas.

Analogue, Digital and Internet Linking

SIRN is best known as an analogue repeater network, but Irish repeater activity also connects with digital and internet-linked systems. The IRTS gateway listing notes that IRLP node 5883 can be accessed using any repeater on the Southern Ireland Repeater Network.

The Southern Ireland Repeater Group has also posted updates about digital and multimode activity. For example, its February 2025 update stated that the Farmers Cross digital repeater EI7FXD on 430.250 MHz had returned as an MMDVM multimode repeater active on DMR, YSF, D-Star and standalone analogue.

This shows how repeater networks continue to evolve. Traditional FM voice remains useful, while digital modes and internet-linked systems add further possibilities.

The Volunteer Effort Behind Repeaters

Repeaters do not maintain themselves. They require equipment, site access, antennas, cavities, power, linking hardware, internet or RF links, technical maintenance, insurance, travel, troubleshooting and ongoing monitoring.

The Southern Ireland Repeater Group states that it operates independently and welcomes donations or contributions from users towards the upkeep and improvement of the group’s infrastructure.

This is an important point. If operators value repeater networks, they should also value the people who maintain them. Supporting repeater groups, respecting the network and using it responsibly all help keep the infrastructure available.

A Simple SIRN Checklist for New Users

Before using SIRN, check:

• Are you licensed to transmit?
• Which SIRN repeater is closest or most likely to be reachable?
• Have you programmed the correct output frequency?
• Is the offset correct?
• Is the CTCSS tone correct?
• Is your radio set to FM?
• Is your antenna suitable?
• Have you listened before calling?
• Are you leaving gaps between overs?

A simple call might be:

“EI___ listening through the network.”

Or:

“EI___ testing through Mount Leinster, any station available for a report?”

Keep it short, clear and friendly.

Final Thoughts

The Southern Ireland Repeater Network is one of the most useful amateur radio resources in the southern half of Ireland. It extends the reach of VHF and UHF operators, supports regular news bulletins and call-ins, encourages activity, and gives beginners an accessible way to experience regional radio communication.

For Kildare Amateur Radio Club members, SIRN is worth exploring. Try listening from home, from the car, or from a portable location. Test which repeaters you can hear. Programme the correct settings into your radio. Join a call-in when confident. Use the network respectfully and support the people who keep it running.

Amateur radio is built on shared infrastructure and shared effort. The Southern Ireland Repeater Network is a strong example of both.