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Case Study: How Security Researchers Used a GPIO Labs LNA to Take Control of a Sports Scoreboard
Posted by GPIO Labs on
Security researchers reverse-engineered a sports scoreboard's radio protocol, then used a GPIO Labs LNA to push their attack signal far enough to override the real controller — and take full control, undetected.
LNA Placement Calculator - System Noise Figure at the Antenna vs. Receiver
Posted by GPIO Labs on
Enter your cable loss and LNA specs, and watch your system noise figure change just by moving the amplifier from one end of the cable to the other.
What Is a Remote LNA? How Remote Amplifiers Work (And How to Power One)
Posted by GPIO Labs on
Put your LNA at the antenna, not the receiver, and cable loss stops costing you signal. We cover how remote LNAs work, how to power one with a bias tee, and a safety detail most guides skip entirely.
Bias Tee Component Calculator — Inductor & Capacitor Sizing with SRF Feasibility Check
Posted by GPIO Labs on
GPIO LABS · RF TOOLS A bias tee's inductor and capacitor need reactance values set well apart from your system impedance to work correctly — but a single L/C pair only covers a limited frequency range before the inductor's self-resonant frequency (SRF) causes it to fail. Enter your frequency range and impedance below to size both components and check whether a single pair will actually work for your design. Minimum frequency (MHz) Maximum frequency (MHz) Set equal to the minimum for a single-frequency (narrowband) design System impedance 50 Ω 75 Ω Reactance margin 5× (tighter) 10× (safer) MIN INDUCTANCE (L)...
Bias Tee Circuit: How It Works and How to Design One
Posted by GPIO Labs on
A bias tee sends power and RF signal down the same cable without them interfering — the part that makes remote LNAs and active antennas possible. We cover how the circuit works, how to design your own, and which one you actually need.