I am a radio amateur, Ashhar Farhan. My callsign is VU2ESE. I like to experiment with radio electronics. These some of the radios, test gear and experiments that I have built. All the content of this website is freely reproducible for any purpose as long as you mention that the original source code/circuit diagram/text was from this website.

Radios

Test Gear
What you can’t measure, you can’t know. Measuring is the most important part of our hobby and it is often the most overlooked. I have build a fair number of simple test gear. Here is an incomplete list:

  • Specan: A Spectrum analyzer
    This is a relatively easy to build spectrum analyzer based on Terry White/Wes Hayward’s QST analyzer. It as difficult as building a simple SSB transceiver. Very much worth the time.
  • Two Tone Generator A two tone generator is an essential test gear made with just four transistors that helps you evaluate your amplifiers, mixers, receivers for distortion. Distortion makes all the difference between a pleasant receiver and a horrible sounding one, between a clean transmitter and bad, splattering one on air.

Design Tools
A Feedback Amplifier Calculator