Projects

• HF Receiver Mark I

  My first attempt at building a decent classical analog shortwave receiver which covers 10 kHz to 30 MHz in a single band, and demodulates AM as well as SSB.

• HF Receiver Mark II

  A much improved version of the Mark I shortwave receiver that again follows classical lines, now with a decent frontend, preselector, an FM demodulator, and with an improved user interface.

• Characterizing a SMA calibration kit

  I obtained a cheap SMA calibration kit without correction coefficients, this is how I characterized it.

• TRL Calibration

  Thru-Reflect-Line calibration of a VNA with the requisite calibration standards on a PCB, together with test fixtures to characterize components.

• Medium power RF amplifier

  A medium power broadband RF Amplifier, mainly intended for laboratory use, with a frequency range from 10 MHz to 500 MHz, and capable of delivering an output power of about 1W.

• CW Signal generators

  Two simple single-board CW signal generators: One experimental one based on the Analog Devices ADF4351 IC, and an improved version based on the Texas Instruments LMX2582 IC, both with precise level control and harmonic filter.

• Another RF signal generator with LMX2582 and a DDS

  An improved version of the signal generator based on the Texas Instruments LMX2582 IC, with a wider frequency range, better calibration facilities, and a faster MCU.

• An active 10 GHz frequency tripler

  A simple connectorized active frequency tripler module based on a Mini-Circuits part, with good fundamental suppression and low conversion loss.

• Noise figure measurements

  The measurement of noise figure and gain of RF and microwave components with a spectrum analyzer and a noise source.

• GNSS Time and frequency receiver

  A GPS disciplined oscillator (GPSDO) which also provides a pulse-per-second signal aligned with the GNSS time scale, and hence can be called a time and frequency receiver.