HD Radio waveform

Listening to HD Radio with an SDR

“HD Radio” is the technology by which US radio stations broadcast digital audio along with their regular analog signal. Standard FM radios only receive the analog signal and ignore the digital data. You need an HD Radio to listen to the digital audio. HD radios are most popular as features in newer automobiles, but adoption outside of car radios, as well as awareness by the … Continue reading Listening to HD Radio with an SDR

Seeed Studio LoRa Kit

Getting Started with LoRa

LoRa is a radio technology for long range, low bit rate communication among sensors (temperature, light, location etc…) and other IOT devices. The sensors send their data to a radio receiver known as a gateway. The leading protocol used by sensors and gateways to manage communications, frequency, data rate and security is known as LoRaWAN. The gateway transfers the sensor data to the cloud so … Continue reading Getting Started with LoRa

SDR dongle

Sniffing GSM with SDR

I’ve been fascinated by software defined radio (SDR) for years but investigating the GSM cellular network has always been just a little too challenging and slightly out of reach. All of that changed earlier this year when someone finally posted a workable, step-by-step guide for decoding (but not decrypting) cellular (GSM) radio traffic. For those not familiar, SDR involves moving much of the functionality of … Continue reading Sniffing GSM with SDR