Projects

Keyers and Voice Keyers
Spider Keyer - Arduino Nano based CW keyer 
Voice Keyer for FT-897
Voice Keyer for Icom transceivers
Sound card <-> MIC CMOS switch with monitoring

Long and Medium Waves Related:
High-performance up-converter for reception of 0...550kHz
Large loading coil for 136kHz
Small loading coil for VLF/LF/MF
1 kW power amplifier for 136 kHz band

Antenna Related
     HF
     Ultimate Remote-controlled ATU for Lower HF Bands
     Semi Automatic HF Antenna Tuner Controlled by Arduino 
     HF transmatch 1 kW
     ATU for HF for handheld receiver AR8200
     Beverage Antenna Pre-Amplifier (2N5109)
     Beverage Antennas Switch 
     Preselector filters for 80m and 160m, CW
     VHF
     DK7ZB antenna 4 x 4 elements for 144 MHz       
     Low noise pre-amplifier for 144 MHz
     14 element Yagi DL6WU for 2m band
     The rope antenna for 144 MHz
     Do you know what your antenna sees? Panoramic view from the top of the mast.
     VHF multi-beaming switch
     Filter 144 MHz 

Miscelaneous
Dummy load 800 watts
Rotary encoder divider (slow down tuning rate)

Software
Virtual Legacy Radio (VLR) - cat software to control FT817/857/897

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