In this video Adam 9A4QV demonstrates his 2.4 GHz homemade helical feed for the QO-100/Es’Hail-2 satellite. Via RTL-SDR.
Mare writes, “This is description of coaxial collinear antenna for 868MHz applications. I designed this for Lorawan gateway.” Project info at Mare & Gal Electronics homepage.
868 MHz, 915 MHz and 955 MHz inverted F antenna (PDF) application note from Texas Instruments: This document describes a PCB antenna designed for operation in the 868 MHz, 915 MHz and 955 MHz ISM bands. This antenna can be used with all transceivers and transmitters from Texas Instruments, which operates in these frequency bands. Maximum […]
This video by Ricardo Caratti demonstrates his method for controlling a Magnetic Loop antenna with an Arduino. The antenna’s tuning capacitor is adjusted using a stepper motor interfaced with the Arduino equipped to read IR commands sent from a compatible IR remote control. This allows the tuning capacitor to rotate clockwise and counterclockwise. Due to […]
Michail Papadimitriou is in the process of developing a Nixie clock which will synchronize with the DCF77 time signal. These standard time signals are transmitted on 77.5 kHz from Germany, and Michail intends to use a DCF77 Time Receiver Module, like SYM-RFT-77 to demodulate the signal. Basically, this module receives the time standard signal and […]