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1. Homebrew items
   • BD4066 : a bat detector using 4066 analog switch
   • 18T135pp “AinSebaa17” : an 18.099MHz CW QRP transmitter
   • 10T639pp “Europa30” : a 10MHz QRP CW transmitter using European transistors
   • 7T9521 “Komukai40” : a 7MHz QRP CW transmitter featuring Class C SEPP power amplifier
   • TT2/J : a Janapnese edition of the famous Tuna Tin 2 transmitter
   • 7R3357 “Fujimino40” : a 7MHz CW receiver featuring AGC-less superheterodyne
   • Shortwave radio accessories : RF attenuator and CW audio filter for SONY, DEGEN and so on.
   • Z-match : a compact antenna tuner for QRP'ers
   • Handcraft radio using toilet paper cores
2. Experimental results
   • A loading antenna design using Smith chart
   • Class C SEPP power amplifier design
3. Archives
   • For schematic drawing in EazyDraw : “electronic_devices_v4”
   • 4th order Butterworth BPF design tool for AppleWorks
4. Preserve Spectrum
   • ARRL BPL page
   • RSGB PLT page
   • “Preserve Spectrum” logo/banner for QSL card, letter head, WEB pages, etc.
     • L size (2000×400 pixels) : PDF/JPEG
     • M size (640×128 pixels) : JPEG
     • S size (256×51 pixels) : JPEG

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