air core capacitors

Hairpin match for the 5 elements Tonna for 6 meter - How to improve the gain of your 5 element Tonna yagi for 50 MHz by roughly 3 db!

YLRADIO - Full wave delta loop - This Delta Loop is a three-sided antenna suspended high in the air by vertical supports, such as tall evergreen trees. Recommended height is 40 feet or more at highest point, but higher is better.

Balun and Transformer Core Selection - Occasionally errors are made regarding core selection. This especially includes baluns, where on occasion some very strange ideas surface.

The 9:1 balun  ^pop - Antenna special on hard-core-dx.com

Homebrew Balun Case - Balun case construction, tipically to host toroid cores. Size of case depends on power to handle. By DL5DBM

Balun single core 4:1 analysis - Real 4:1 Transmission Line Balun with Balanced Load

HF Antenna and Tower Raising - Raising a new tower and a pair of large beam antennas pictures and notes

DirectionalBiQuad - Seattle Wireless - A biquad is a fairly powerful antenna which is relatively easy to construct, with impressive performance for their size. A link greater than 5 miles can be made with a pair of these as a stand-alone antenna and a Prism2 100mW card, provided you keep coax short, and your line-of-sight is clear.

RTTY Contests - Calendar with scores and rules of recent and upcoming RTTY contests

ARRL Access to Amateur Radio for the Disabled - Articles for the sight impaired

A Ham Radio Public utility HF Station  ^updated - Merging Internet technology with Amateur Radio holds great promise. This article discusses the authors’ experiences in putting several Internet Remote Base stations on the air. By Stan Schretter, W4MQ, Brad Wyatt, K6WR, and Keith Lamonica, W7DXX

WB9KMO Ham Radio Video Library - The Ham Radio Video Library is a continuous loop of several ham radio-related video clips. The current clips are Monroe School ISS Contact (15 minutes), DARPA Grand Challenge - Ghostrider (5 minutes), DARPA Grand Challenge - Stanley Wins! (5 minutes), JOTA - Jamboree On The Air (15 minutes) and SBARC Tesla Presentation (50 minutes) - times are approximate

VBI-360 Beam Indicator - VBI-360 Beam Indicator - New Display Units, Repairs & Map Upgrades, SteppIR, Green Heron, 90 Degree Offset, Global Beam Display, CGARS, Hy Gain, Roto-Brake

Opek Tech - Tawainese antenna manufacturer. Multi-Band HF/VHF/UHF Mobile Antennas

Genesis Lamp - Sell all types of obstruction lighting. Lighting for your ham radio antenna tower. Genesis Lamp stocks a wide variety of replacement bulbs and specialty replacement light bulbs including: airport lighting and airport light bulbs, incandescent light bulbs and more

HFPack - HFpack provides an information exchange about transceivers, antennas, systems, HF packs, propagation, new developments and techniques in HF portable operation. Radio Amateurs are invited to participate in egroup and on-the-air nets around the world.

R7 Vertical Maintenance and Repair - How repair the traps, and then homebrew the rest of the antenna, including the matching box

Akron Antique Audio - Purveyors of Quality Vintage Tube Audio & Electronics and Vintage radios, Sales Service, Repairs & Restorations of quality vintage tube Electronics, Located in Akron Ohio

All American - Distributor of electronic components, ull range of semiconductors (active components), including relays, circuit breakers, transistors, diodes, memory devices, microprocessors, microcontrollers, and other integrated cuircuits, as well as passive components, such as capacitors, resistors, inductors, and electromechanical products, including cable, switches, connectors, filters, and sockets.

Circuit Specialists - We specialize in pc-based data acquisition systems, test equipment, electronic components, disk on modules, choke and coils, diodes, capacitors and connectors, potentiometers, crystals, resistors, relays

Walcott CB Radio Store - CB Radios And Antennas, Marine Radios, Scanners, Radar Detectors. Online store and repair service

Tri-Star Communications - Professional only repair services, public safety devices and scanner dealer in Illinois USA. Does not offer consumer electronics service.

K4EAA Kenwood Restoration - Kenwood Sales, Service, repairs, parts, FAQ, information

JavaScript Electronic Notebook, K7MEM - It consists of a group of JavaScript® driven web pages that are intended for use as a quick reference for Ham Radio operators or just anyone interested in electronics. Offer calculators for Resistors, capacitors, inductors, power supplies, filters, attenuators and antennas

SB220 SB221 arcing problems improvements mods - This article explores the claim an amplifier might arc from a parasitic oscillation, damaging capacitors, bandswitches, or other components.