Guanella Current 4:1 Balun
Guanella Current 4:1 Balun
A large picture with construction details of a homebrew guanella current balun 4:1

K3LR method of installing a PL259
K3LR method of installing a PL259
A method of installing a PL259 coax connector, a complete tutorial on how to solder Amphenol 83-1SP connectors

MagLoop 10-24 Mhz
MagLoop 10-24 Mhz
A few pictures of an homebrew magnetic loop RTX antenna project, working from 30 to 12 meters with excellent results

Decoding West Germany Numbers
Decoding West Germany Numbers
A simplified explanation of decoding West German numbers messages transmissions without a computer.

432MHz Low Noise Preamp
432MHz Low Noise Preamp
An easy to build with a cheap HEMT FET Transistor Low noise preamplifier with FHX35LG based on JH0WJF design

Arduino Flex Controller
Arduino Flex Controller
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
Locating Power Line Noise
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
A Remote Morse Key
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
10 15 20m Open Sleeve Dipole
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
Yaesu FT-817 – Noise Blanker improvement
A modification to improve quality of built-in FT-817 Noise Blanker