coaxial traps

VHF coaxial antenna COBRA - An efficient vhf antenna for portable use by F5KIN

8el 50Mhz / 70Mhz Dualband Yagi - Only just over 6 foot long, a compact 8 element dualband Yagi for 6 and 4 meters band. No traps or coils, no matching required. Simple to build by G0KSC

Dual Band Yagi 28Mhz and 50Mhz Priority listing - NO Traps or coils, NO matching required. Direct 50 Ohm feed. Easy to build and nothing else like it! Enjoy 50/28 with one feedline to a dual band high gain Yagi by G0KSC

Magnetic longwire baluns 1:9 - This Magnetic Longwire Balun (MLB) makes it possible to efficiently use a coaxial lead-in cable with all forms of longwires, T-forms or other types of wire antennas, without the need for an antenna tuner.

Why is 50 ohm coax so special - Why is 50 ohm Coaxial Line so Special Anyway?

A model of the W2DU 1:1 choke balun - Notes on making the W2DU choke balun by placing several ferrite sleeves around a coaxial cable.

Coaxial antennas - G3TXQ study on coaxial cable demonstrate that it can reduce an element's length by something approaching the Velocity Factor of the cable

Another vertical antenna for 30, 40 and 80 meters - This article is to describe a multi band DX-dedicated antenna offering a minimum of compromises (such as lossy traps), for the hams not having any high-support

Antenna maintenance by PA0FRI - PA0FRI article on maintenance or a FRITZEL antenna by cleaning and restoring antenna traps, baluns and elements

Gamma Match Article - A working analysis of the gamma-match problem that gives usefull practical results. New light on the question of when it will and when it won't give a perfect match to the coaxial transmission line.

Building traps with coax cable - Tips on how to build a trap using common coaxial cable and coax trap software, by F5JTZ in french

Cushcraft Trap - Coaxial Capacitor Repair - Repairing coaxial capacitor on cushcraft trap. Parts are no longer available from the manufacturer, home repair is the only option.

RF Industries - RF Coaxial connectors, adapters, installation and test kits, Coaxial cable assemblies

DowKey - Coaxial switches manufacturer

Amphenol - One of the largest manufacturers of interconnect products in the world. The Company designs, manufactures and markets electrical, electronic and fiber optic connectors, coaxial and flat-ribbon cable, and interconnect systems.

Coaxial Dynamics - Manufacturer of precision equipment, Power meters Wattmeters

QRP 1:1 Current-type Balun for Portable Use - A ferrite-loaded coaxial RF choke which just happens to yield the same result as a 1:1 current balun

Adur Communications - Specialist in the design and supply of Radio Communications Equipment and Systems. West Sussex England. Antennas, traps and baluns inline isolators, Outbacker Antennas, Mobile Mounts and Accessories

Praxtel Telecommunications - Praxtel offers coaxial cable and connectors, as well as fiber optic cable, connectors and other products for telecommunication applications. 50 Ohm Coaxial and Helical cables. 75 Ohm coax cables.

RF Relay Store - RF Coaxial Relays from stock is the answer to your urgent small quantity needs.

Remote antenna switch - A remote antenna change-over switching using relay powered over the coaxial feeder

Remote Coax Switch - 6x2 coaxial remote antenna switch, completed unit showing weatherproof relay box and station control unit.

Coaxial Cable The neglected link - The purpose of this document is to show the transfer impedance and shielding effectiveness of different types of coaxial cables

Fitting a PL259 to a coaxial cable. - Fitting a plug to thin, 6mm, coaxial cable will require a PL-259 either made for the small diameter cable

Coaxial Stub Filters - A range of easy-to-build RFI filters by John Regnault, G4SWX