An home made doblet antenna made with two Slinkys that are aproximately five meters in length connected with a twin-feed connected to a balanced ATU
Available worldwide can be used as Arduino Shield or plug it in to you PC , or with a bluetooth adapter connect to Android. With a highly optimized software, KAI200 brings you: a. Antenna analyzer form 1 up to 200 Mhz; b. WSPR transmiter (set up by serial terminal); c. Square Wave Signal generator KAI200 is all you need for your radio whatever it is Yaesu, Icom, Kenwood or Drake and DIY projects.
The MMDVM is a device that interfaces PC to radios, can be used with a raspberry pi, turning a normal analog radios into a digital node connected to the internet or very simply as a digital repeater.
This is a great project to learn about the basics of electronics, batteries, and renewable energy. The finished project can charge a phone or tablet, light up a camp-site, and provide for whatever other small electric needs you have.
Undertanding the velocity factor in coax cable feed lines. Meaning of the veolcity factor index related to the RF speed of a signal inside the coax cable.
The QCX 5W CW Transceiver From QRP Labs, a detailed article describing from the unboxing of the component to the final assembly of the CW QRP Transceiver
Presentation of the QO-100 the first geostationary OSCAR from Qatar by AMSAT-DL
Realtime online log search for 5X3C DXpedition to Uganda 2019
P4-A narrowband transponder Operating Guidelines and Band Plan, coverage map of the QO100 geostationary amateur radio satellite
Transverter for 13 cm 23 cmd and 33 cmd band. 23 cm RF power amplifier, RF power amplifier for 2.4 GHz for the QO-100 satellite. Popular for the 1296 MHz transverter