Over on Hackaday we’ve seen a story about a Raspberry Pi Pico based software defined radio transmitter that is capable of transmitting SSB, AM, FM and CW anywhere between 0.5 – 30 MHz. The design generates an oscillator signal using the Pico’s Programmable IO. For AM/SSB it uses the PWM output pins to generate an RF…
SDU-X: SOFTWARE DEFINED DATA TRANSMISSION WITH ULTRASONIC TRANSDUCERS. Damian needed to get telemetry from his off-grid solar system 150 feet away, but didn’t want to spin up another unreliable WiFi device. Instead he came up with a clever solution that involves using ultrasonic transducers as the physical layer of a software defined communications system instead of RF…
The WSPR-TX XP Plus is a standalone all band WSPR transmitter with built in GPS for the radio amateur experimenter. This Plus version is pretty much the same as the WSPR-TX XP except for two additional features in the Plus model: 1 WiFi 2 External frequency reference input Some quick features: 1: Standalone operation, PC required for configuration but not for operation.…
HackerBox 0096: Get radio active by exploring the two meter very high frequency (VHF) amateur radio band, how to obtain an amateur radio license, and how to join an amateur radio club. Configure the ESP32 T-Display module for easy programming via the Arduino Integrated Development Environment (IDE). Assemble the exclusive HackerBox Two Meter (2m) radio lab…
How To Charge Li-Ion/LiPo Batteries With A Power Supply Video by EEVBlog How to safely charge Lithium Ion & Lithium Polymer batteries with a bench power supply, for when you don’t have the correct charger available. WARNING: Take care using PSU’s for charging unprotected cells. A fault in the PSU might overload or short the…