kv4p HT is a homebrew VHF radio that makes your phone capable of voice and text communication completely off-grid with at least a Technician class amateur radio license. The radio simply plugs into the USB C port on your Android smartphone and transforms it into a fully-fledged handheld radio transceiver. It’s completely open source (GPL3):…
Frequency Counter DIY Kit Module An easy to build Open Source DIY kit of Frequency Counter based on PIC16F628A microcontroller. Economy package intended to measure frequency input up to 5MHz. Full extended package includes MB506 prescaler that allows to measure HF and VHF up to 250MHz. Technical specification for Economy Package 5MHz Counter: Low frequency…
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.…