EA4EOZ an amateur radio electronic enthusiast

In this site you can find some things I have made in the recent years.

I hope some of them can be useful to you!

Ham radio

• Homebrewing
  • A simple 137 kHz antenna preamplifier to make your FT-817 (and others) useable on 2200m band.
  • Build your own HF balun.
  • A really simple field strength meter.
  • Construction of the OZ7IS and OZ2M 70 MHz transverter.
  • A 144 MHz halo antenna.
  • A 144 MHz turnstile antenna.
  • A handheld 2.4 GHz spectrum analyzer.
  • The Amazing Portable All-Band Receiver, also useful as test tool.

• Ham equipment mods
  • Improve your V-2000 triband antenna performance in 50 MHz.
  • Yaesu FT-817 noise blanker improvement.
  • Improve the stability of your Yaesu G-250 rotator.
  • Modify your Yaesu NC-29 charger for 220V operation.
  • Technical considerations about the Yaesu VX-1.
  • Modify the Yaesu VX-2 jumpers to get wide coverage receiver.

• Misc. stuff
  • Remove interferences from your PC power supply.
  • Recycling the SilverCrest WE-2100 digital dial.
    • Recupération du fréquencemètre digital de la radio SilverCrest WE-2100.
  • How to use common universal LNB in ham radio: LNB tutorial.
  • Playing with Gunn diodes.
  • KP4AO: Our first EME experience (2010-April-17)
  • Visual MS, just for historical puporses.

Radiation

• My personal review of the DRSB-88 russian geiger counter.
• My personal review of the Radex 1503 russian geiger counter, including repairing tips and mods.
• One Gigaohm high voltage probe.
• UGP:
  
  • Universal Geiger Platform
  • Universal Geiger Protocol
  • Universal Geiger Program
• α, β and γ homemade geiger counter with UGP interface.
• AVRMCA: AVR based Multi Channel Analyzer.
• Detecting alpha particles with a modified webcam

Other

• EA4EOZ's JDM programmer. A serial port PIC programmer modified for properly EEPROM operation.
• HamGPS, get your current locator with your java mobile phone.

Miguel A. Vallejo, ea4eoz @ [gmail.com | ure.es | yahoo.es]