RTL-SDR receiver
A compatible SDR dongle and antenna receive local RF energy from the surrounding area. The software does not need to listen to voice audio.
High-level product overview
How Tetra Detect X1 works.
Tetra Detect X1 gives users a clear visual warning when nearby UK and EU TETRA police and emergency services RF activity increases. It continuously compares the local RF environment against a live background baseline, then turns repeated mobile-style behaviour into a simple confidence and proximity display.
Passive RF input
No listening. No decoding. No recording.
The detector watches local RF behaviour, looks for meaningful rises above the local baseline, and translates activity into simple visual states: idle, activity, nearby, and very close.
The detection flow.
A clear view of the product pipeline, from SDR input through to the live proximity display.
Range awareness
The software checks the selected UK/EU TETRA range or approved frequency list, moving across the band to find where activity is changing.
Signal behaviour
Background levels are tracked continuously, so sudden rises can be judged against the local environment rather than a fixed one-size setting.
Confidence view
Repeated mobile-style behaviour is converted into readable confidence and proximity-style warning states.
Detection logic.
Tetra Detect X1 is designed to make local RF activity easier to understand by comparing live conditions, watching repeated activity, and presenting the result as a simple proximity display.
Live background baseline
The detector learns the normal RF level around the receiver. This helps the software separate ordinary background conditions from activity that deserves attention.
Rise above the baseline
When energy rises above the local baseline, Tetra Detect X1 treats it as a possible activity event and begins watching how that activity behaves over time.
Repeated mobile-style behaviour
The software looks for activity that appears repeated and mobile in nature, rather than simple background noise or a steady carrier.
Confidence and proximity display
Instead of asking users to interpret technical RF data, the software presents confidence, signal history, and colour-coded proximity states.
Lock, watch, and drop back
When activity looks promising, the detector can focus attention on it for a closer view. If the activity fades or stops behaving like a useful signal, it drops back and resumes wider awareness.
What the software watches.
Tetra Detect X1 focuses on signal presence, movement, repetition, and confidence. It does not make communication content available.
Local radio energy
The receiver sees changes in RF power around the monitored range and compares them against the live background environment.
Movement across channels
Range scanning lets the detector move across a band, revisit channels, and highlight areas where activity becomes more interesting.
Readable proximity states
The interface turns technical RF behaviour into confidence, signal history, and clear states: green, yellow, orange, and red.
From quiet to close.
The product is designed to be read quickly, even by users who do not understand SDR waterfalls or raw RF plots.
IDLE
Normal background RF level.
ACTIVITY
Activity is rising above the live background baseline.
NEARBY
Stronger repeated mobile-style activity is being seen.
VERY CLOSE
The highest visual proximity warning state when activity becomes stronger and more convincing.
Why the graph matters.
The signal history view helps users see short rises, repeated activity, and stronger local RF patterns as they happen.
High-level interpretation
Repeated close spikes can be a useful visual clue that local emergency services RF activity is changing quickly around the receiver. Tetra Detect X1 uses this kind of behaviour as part of a wider confidence picture. The graph is designed for awareness, not for identifying people, vehicles, incidents, or communications content.
Built for awareness.
Tetra Detect X1 is built to show RF activity and proximity-style warnings without making protected communications available.
What users see
- Live visual warning state
- Channel confidence display
- Signal history graph
- Range scan and lock behaviour
- Live baseline and activity comparison
- Optional audible alert
What it does not do
- No voice listening
- No Airwave or encrypted TETRA decoding
- No recordings or communications content
- No officer, vehicle, person, or incident identity
- No communication-content analysis
Built for fast local awareness.
Join the launch list for Tetra Detect X1 software-only updates or the complete SDR dongle and antenna kit.
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Passive RF signal-awareness only. Tetra Detect X1 is not intended to decode encrypted TETRA, intercept private communications, record radio traffic, or help anyone interfere with emergency services. It is illegal to listen to police communications.