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Homebrew
Antennas
70MHz Quarter Wave Ground Plane Antenna
144MHz 2m Portable Yagi VHF Beam Antenna
Magnetic Loop Antennas
Homemade Carolina Windom antenna
Homemade 20 metre band loft dipole!
Baluns and UnUns
End Fed Half Wave Antenna Coupler (EFHW)
1:1 Voltage Balun for HF wire dipoles
9:1 Magnetic Longwire Balun / Unun
Simple CW Touch Keyer Circuits
Capacitive CW Touch Key Circuits
2N6084 144MHz FM Power Amplifier
G3XBM 472kHz Transverter
Rig to Soundcard Interface
PIC controlled 500w ‘Modified Sine Wave’ Inverter
Alkaline battery charging circuit
Calculators
Slim Jim and J Pole calculator
1/4 Wave Ground Plane Antenna Calculator
Ohms Law Calculator
dBm, dBW, µW, mW, Watt, KW and MW Calculator
Loaded Quarter Wave Antenna Inductance Calculator
ERP & EIRP Calculator
Resonant Frequency Calculator
PI attenuator calculator
T attenuator calculator
Air Cored Inductor Calculator
Inverted Vee Antenna
Parallel Resistor, Inductor or series capacitor calculator
Electricity cost calculator kW/h
Mods
Yaesu MH-31 Electret Condenser Mic Modification
MFJ-971 Portable Antenna Tuner Modifications
Icom IC-7200 SO-239 to N-Type Socket
Reviews
Manson SPS-9400 40A 3-15V Switchmode Power Supply
Other Stuff
Printable Amateur Radio Logbooks
Useful information on Lead Acid Batteries
My Logbook
Contact Me
Ubox 1818 //top\\ May 2026
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