Blog

FPGA: a quadrature oscillator with rotary encoder control

2021-10-20T18:48:56Z

This design is a pure VHDL quadrature signal generator.With variable frequency. The frequency can be controlled with a scroll wheel.The purpose of this design is to build an alternative local oscilator for Shabaz' Software Defined Radio (SDR) Exp...(read more)

EM Surfer

2021-09-02T18:31:14Z

Even faster than the seasons appear to be changing another month's Project14 event is upon us. Hopefully, the Element14 team will consider fast edges to be an RF topic. I have really enjoyed participating in Project14 events, as its all...(read more)

RC Toy Hack - RC car rescue/restore/recycle/retrofit

2021-08-15T01:15:14Z

Overview - a 25 year old RC car , an obsolete aged 49 MHz model had been hacked & sitting in a junkpile for decades.....It is saved from the trash bin, land of misfit toys, recovered and restored it to original working condition,......then tore i...(read more)

Software Defined Radio (SDR) Experiment Board

2021-08-04T04:08:00Z

Introduction What is SDR? How Does it Work? Circuit Walk-Through Voltage Regulators Quadrature Local Oscillator Mixers and IF Amplifiers RF Amplifier RF Filter Using It Printed Circuit Board Revision 1 PCB Issues and Fixes Quadrature LO Pin 12 I...(read more)