1:1 voltage balun

How to Build a UN-UN - Building a 1:1 balun, aka un-un, with an Amidon Ferrite toroid core T 200

Balun 4:1 - 4:1 Ruthroff voltage balun design using a T200-2 Toroid core

VHF UHF Scanner Antennas - Homebrew U/VHF scanner antennas using parts from other Antennas and spare stuff I had laying around. Antennas use a balun and 75-ohm coax to make it back to the scanners by KA6WKE

SB-220 Repairs and Modifications - Heathkit SB 220 mods, replacing the Zener ZD1, replacing the plate-voltage voltage divider, adding a keying circuit for solid state transceivers

Heathkit SB-220 Meter Repair - Repairt a Heathkit SB-220 Linear Amplifier with a bad Plate Voltage meter

Cushcraft A3S Balun Fix - Cushcraft A3S HF antenna 1:1 balun repair.

High voltage power supply - An High voltage power supply design by F1FRV

40 CW QRP Transmitter  ^new - Here is a easy to build and cheap CW transmitter using 40 m cristals. Power output is approximately 6 Watts for a supply voltage of 13.8 VDC

RF Probe Project - If you needed the ability to quickly measure RF voltage for tuning filters and cavities this RF Probe probe is for you