toroid core

1:6 Balun for the HF bands - 11 wdg bifilar on Amidon T 200-2 Toroid core

Air Cored 1:1 HF BALUN - An air cored 1:1 balun for 3.5 to 30.0 MHz

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

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

CT1BOH Contest Results - Past results and scores of popular ham radio contests collected by CT1BOH

Pilup.ru - Unofficial Claimed Scores by Valery, R5GA

Olympix - Performance RFI Filters that work right at the noise sources, ferrite cores.

Fixing the LDG Z100 ATU - Repair LDF Z-100 toroid by VK4ADC

EMCoS Anntenna VLab - EMCoS Antenna VLab Student Version edition contains the full-functional MoM based 3D EM solver. It lets to solve task that fits into as big as 2GB memory for incore or out-of-core calculations. Both, 32Bit and 64Bit versions are available.

Coil32 Priority listing - Coil32 is a free coil inductance calculator, that allows to calculate: single layer and multi layer air core coils, toroidal air core coils, inductors on ferrite rings, in pot core, flat coils on the PCB, and also LC resonance parameters. The program have additional plugins to calculate another kinds of coils. The application is free for usage and distributing.

SDR Sharp - SDR# (read SDR Sharp) is a high performance Software Defined Radio application. SDR sharp is a fully featured SDR capable of handling samplerates from kHz level soundcards up to multi hundred MHz dedicated samplers, thanks to its multi-core architecture.

Connectors - There are scores of RF connector types, ranging from the \"cheap and cheerful\" to the extremely expensive types intended for use in professional and military applications.