Amateur Radio & SDR Hub
TETRA technology, software defined radio, emergency-services digital radio, amateur radio licensing — everything around radio technology, SDR# and SDR++ with RTL-SDR in Germany.
Radio Technology Fundamentals
Waves, frequency, wavelength, modulation types (AM/FM/SSB/digital) and frequency bands in Germany — the solid starting point.
To the fundamentals →TETRA & Emergency-Services Digital Radio Legal situation
TETRA technology, TDMA time slots, emergency-services frequencies in Germany (380–400 MHz), legal situation under TKG §148 — what is allowed and what is not.
To TETRA & emergency services →SDR Reception Hands-on
RTL-SDR, AirSpy, HackRF compared. Setting up SDR# and SDR++. Receiving FM radio, aviation ADS-B, AIS, NOAA weather satellites.
To SDR reception →Installation & Decoder Setup
RTL-SDR v4 drivers (Zadig/WinUSB), cropinghigh sdrpp-tetra-demodulator step by step, SDR-Trunk, Telive-2, GopherTrunk.
To the installation →Amateur Radio Licence
What radio amateurs may do, licence classes E and A, relevant bands in Germany, getting into the exam via DARC and BNetzA.
To the licence info →TEA2 & Encryption Security
Demodulator vs. decoder — the difference. The TEA1 backdoor (2023), TEA2 in the German emergency-services network, OTAR, what SDR users can and cannot do.
To TEA2 →Digital Signals Tutorials
Decoding ADS-B, APRS, FT8, AIS — 4 complete Windows tutorials with embedded videos. Beginner explanation plus step by step.
To the tutorials →Antenna Building DIY
The λ/4 formula, V-dipole for weather satellites, the discone all-rounder — with build plans and DIY videos. The antenna decides your reception.
To antenna building →TETRA on Windows 3 ways
Using the cropinghigh plugin without Linux: GitHub binary, MSYS2 build or GopherTrunk — with an installation video and comparison table.
To TETRA on Windows →Weather Satellites NOAA + Meteor
Receive your own satellite images: pass calculation, V-dipole, SDR# + WXtoImg/noaa-apt (NOAA) and SatDump (Meteor-M2). With videos.
To weather satellites →Quick Reference Look-up
Frequency table for Germany, all amateur radio bands, software downloads, abbreviations and online resources — all on one page.
To the reference →| Device | Frequency | Price | Recommendation |
|---|---|---|---|
| RTL-SDR Blog V4 | 500 kHz – 1,75 GHz | ~40 EUR | Beginner — best choice |
| AirSpy Mini | 24 – 1800 MHz | ~100 EUR | Advanced |
| HackRF One | 1 MHz – 6 GHz | ~350 EUR | Transmit + receive |
| Software | Platform | Cost | Recommendation |
| SDR++ | Win/Linux/macOS | Free | First choice 2026 |
| SDR# | Windows | Free | Good for beginners (Win) |
| GopherTrunk | Win/Linux/Pi | Free | Simplest multi-decoder |