Posts Tagged ‘antenna’

Building a DIY 2.4 GHz Helical feed for the QO-100/Es’Hail-2 satellite

Wednesday, August 14th, 2019 In this video Adam 9A4QV demonstrates his 2.4 GHz homemade helical feed for the QO-100/Es'Hail-2 satellite. Via RTL-SDR.

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Posted in DIY | No Comments »

Colinear antenna for 868MHz Lorawan Gateway

Thursday, April 5th, 2018

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.

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App note: 868 MHz, 915 MHz and 955 MHz inverted F antenna

Saturday, November 15th, 2014

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...

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Magnetic loop antenna controlled by Arduino

Friday, October 19th, 2012

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...

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Posted in Arduino, how-to, RF | 3 Comments »

Testing CMA-77-100 antenna with SYM-RFT-77 DCF77 receiver module

Saturday, April 21st, 2012

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...

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Posted in digital radio data, RF | 4 Comments »

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