EA4EOZ an amateur radio electronic enthusiast

In this site you can find some interesting 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
  • How to use common universal LNB in ham radio: LNB tutorial.
  • Playing with Gunn diodes

• 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
  • The Amazing Portable All-Band Receiver, also useful as test tool.
  • 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.
  • Repairing the Radex 1503.
  • Radex 1503 sound mod.
• One Gigaohm high voltage probe.

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 and a bluetooth GPS.

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