![Guanella Current 4:1 Balun](https://i0.wp.com/www.dxzone.com/thb-31515.jpg?w=150)
A large picture with construction details of a homebrew guanella current balun 4:1
![K3LR method of installing a PL259](https://i0.wp.com/www.dxzone.com/thb-31514.jpg?w=150)
A method of installing a PL259 coax connector, a complete tutorial on how to solder Amphenol 83-1SP connectors
![MagLoop 10-24 Mhz](https://i0.wp.com/www.dxzone.com/thb-31512.jpg?w=150)
A few pictures of an homebrew magnetic loop RTX antenna project, working from 30 to 12 meters with excellent results
![Decoding West Germany Numbers](https://i0.wp.com/www.dxzone.com/thb-31500.jpg?w=150)
A simplified explanation of decoding West German numbers messages transmissions without a computer.
![432MHz Low Noise Preamp](https://i0.wp.com/www.dxzone.com/thb-31504.jpg?w=150)
An easy to build with a cheap HEMT FET Transistor Low noise preamplifier with FHX35LG based on JH0WJF design
![Arduino Flex Controller](https://i0.wp.com/www.dxzone.com/thb-31506.jpg?w=150)
A perfect companion to Flex 6000 Signature when used next to the official SmartSDR program but it can be used in stand-alone mode. Arduino controller uses a TFT touch screen with 800×480 pixel resolution, eight multifunction rotary encoders
![Locating Power Line Noise](https://i0.wp.com/www.dxzone.com/thb-31509.jpg?w=150)
RF interference from power lines is caused by arcing as high voltage electricity bridges a gap to a lower ground potential on the power pole. Corroded or loose connections, cracked insulators almost all of the hardware on a power pole can be the source of arcing.
![A Remote Morse Key](https://i0.wp.com/www.dxzone.com/thb-31516.jpg?w=150)
A simple DIY project to have a remote cw key connected to your Rig. On the remote side it uses and Arduino Uno board and a cheap HanRun Enc28J60 ethernet shield. On the local side it uses a Morse Key connected to a serial port.
![10 15 20m Open Sleeve Dipole](https://i0.wp.com/www.dxzone.com/thb-31507.jpg?w=150)
Based on a simple project based on a 2 elements Yagi for 20m band, and then becomed a triband yagi with a open-sleeve feed system
![Yaesu FT-817 - Noise Blanker improvement](https://i0.wp.com/www.dxzone.com/thb-31503.jpg?w=150)
A modification to improve quality of built-in FT-817 Noise Blanker