Location
A dominant location for radio communications.
The idea of Čemernica grew from operating on the summit, where club members during VHF contests recognised exceptional propagation and the potential of the site for wider radio infrastructure.
E74BYZ
Radio Club Nikola Tesla
Banja Luka
We build Connections that last Longer than a single signal.
Amateur radio, infrastructure, knowledge, and work in the field.
Infrastructure index
System overview
Infrastructure
VHF
R0 · ANALOGUE REPEATER
RX 145.000 MHz · TX 145.600 MHz
Infrastructure
DMR
Local DMR in Banja Luka
TX 438.2750 · RX 430.6750
ID 218012
DMR Čemernica
TX 438.8500 · RX 431.2500
ID 218020
Infrastructure
MESH
E74BYZ MESHTASTIC NETWORK
mesh.e74byz.rs.ba
Project
ČEMERNICA
ČEMERNICA DMR
E79DCE · CC1
RX 431.2500 MHz · TX 438.8500 MHz
1946
Since 1946 · "Nikola Tesla" Amateur Radio Club
More than a radio club. A place where knowledge moves forward.
E74BYZ brings together generations of radio amateurs who share knowledge, build infrastructure and pass their experience on to new members — from a first callsign to field operation and modern digital networks.
Magistral infrastructure
Čemernica
44.5218° N · 17.2131° E · 1339 m n.v.
A magistral UHF/DMR repeater — with APRS and Meshtastic nodes on the same summit.
At Čemernica, we are building an autonomous radio-communications site combining UHF/DMR repeater infrastructure, APRS, Meshtastic and remote system control — with a power system designed to operate independently of the electrical grid.
Goli Vis
1339 m n.v.
44.5218° N
17.2131° E
Energy · Network · Control
Designed to keep operating when the infrastructure around it does not.
- Solar 12 V
- Radio gear
- Repeaters
- APRS
- Meshtastic
- Remote control
Solar 12 V power, communications equipment, repeaters, APRS, Meshtastic and remote control make Čemernica an autonomous technical site built for long-term operation.
See how the system is built-
Step 1 Start of the path Application
Apply for the next training cycle and take the first step toward an amateur-radio licence.
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Step 2 Hands-on training Training
Learn from radio amateurs. Work with real equipment. Prepare for the exam.
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Step 3 Knowledge check Exam
Knowledge becomes an official step.
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Step 4 E7••• Callsign
Your callsign becomes your unique identity in the amateur-radio world.
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Step 5 ENTRY · NOVICE · CEPT License
After passing the exam comes the process of issuing an amateur-radio licence in the appropriate category.
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Step 6 First contact on air On the air
First call. First contact.
RADIO OUTDOORS
Radio doesn't end
in the shack.
Mountain summits, parks and open terrain become places for new contacts, experiments and competition. We take radio into the field, where knowledge, equipment and terrain shape every signal.
POTA
Park activations with a portable station — radio from nature and contacts worldwide.
SOTA
Radio from mountain summits. The climb, portable gear and contacts from places you first have to reach on foot.
WWFF
An international programme of radio activations from protected natural areas, combining on-air operating with time outdoors.
PORTABLE
Radio without fixed infrastructure — portable stations, temporary antennas, battery or solar power and operating from changing locations.
Competitions & expeditions
Club outings, special activations and VHF/UHF contests from field sites where equipment, propagation and teamwork decide the result.
ARG
A sport-technical discipline where receivers and directional antennas are used outdoors to find hidden radio transmitters.
News
What's new
on the air.
Field activations, club work and infrastructure updates — the latest from E74BYZ.
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Radio Club "Nikola Tesla" at the Pecka Outdoor Festival 2026
Radio Club "Nikola Tesla" Banja Luka took part in the seventh Pecka Outdoor Festival, held 26–28 June 2026 near Mrkonjić Grad, where members ran an amateur radio direction finding (ARG) workshop. Participants used receivers and directional antennas to locate four hidden transmitters, or "foxes."
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Record amateur radio training successfully completed – 28 candidates pass the exam
After two months of intensive training, the amateur radio course at Radio klub „Nikola Tesla“ Banja Luka has concluded, with 28 candidates taking the exam: 22 passed for the CEPT category and six for the Novice category.
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Radio amateurs of “Nikola Tesla” at the Springs of the Sana River
Radio klub “Nikola Tesla” from Banja Luka activated POTA reference BA-0032 at the Springs of the Sana River under the callsign E74BYZ, making around sixty contacts on CW, SSB and FT8. The team set up antennas, worked QRP and digital modes, and packed up at 18:00 before dinner in Gornja Pecka.
Sponsors & friends
Sponsors and friends of the radio club.
These partners stand with Radio Club Nikola Tesla — supporting training, infrastructure and work on the air. Anyone who wants to become a club friend is welcome to get in touch.
Become a club friend
CQ CQ CQ
E74BYZ, QRZ…
Questions about the club, training or the network? Write to us — we are in Banja Luka.
Contact
- info@rknikolatesla.rs.ba
- Banja Luka, Republika Srpska, Bosnia and Herzegovina
Write to us