high voltage transformer

A 6 element OWA Yagi for 28MHz Priority listing - This is a high-gain, wideband OWA Optimised Wideband Array Yagi which covers the 10m band with an SWR of less than1.1:1 from 28-28.900MHz.

G3YXM Small Loop - This simple antenna is capable of remarkable results on 160, 80 and 40 metres. Forming a triangle from around 50 feet of satellite TV coaxial cable, the top of the triangle can be as low as 15 feet, and the lower side just high enough to prevent a passer by hanging themselves

High Gain Yagis for 432 MHz - DJ9BV dubus article on two different type of high gain antennas for 432 MHz.

Sleeve Baluns - Sleeve baluns are normally used at VHF and higher. As a general rule, they are not practical at HF. The balun can be inverted and used as a skirt to form part of the antenna element

A Mini Primer on SWR Measurements - What Does a Low or High SWR Mean? Relation between SWR and antenna efficiency by WB6FRZ

Helical Antennas - The Helical antenna description, a simple way of obtaining high-gain and a broad band of frequency characteristics

Rhombic Antennas and Inverted V - The rhombic antenna is often claimed to be an exceptionally good antenna with very high gain. Modelling rhombic antennas

Burnham Beeches Radio Club - The Burnham Beeches Radio Club. For armateur radio enthusiasts from Burnham Beeches, Slough, High Wycombe, Maidenhead, Beaconsfield and surrounding areas. We have club nights and activity on all bands as well as DX picnics, ARDF and contest events.

GW4LFO Highfields Amateur Radio Club - Ham Radio Club in Wales UK

PENN-DEL Amateur Radio Club - Sponsor of KA3TWG repeaters and the Delco SKYWARN program

HIDARG High desert amateur radio group - High desert amateur radio group, amateur radio operators who live on the Oregon high desert plain that extends from the Cascade Mountains east into Idaho and south to California.

RF Power Amplifiers - RF Power develope, produce and sell high quality solid state RF Power linear amplifiers

Antenna Engineering - Antenna Engineering specialise in producing a range of high quality aluminium HF verticals ranging from mono band single element verticals to multi element phased arrays.

Pro Antennas - Specialist UK manufacturer of high performance compact HF antennas

Innovantennas - Manufacturer of innovative and high performance antenna solutions, yagi antennas for HF VHF and UHF

NP Technologies Inc - Design, develop, test and manufacture a wide range of Amplifier products including highly linear class A Broad Band, Cell Band, Pulse, AM & FM broadcast and Military VHF

PRO-COMM INC - High power, UHF, L-band, S-band, C-band, microwave frequency amplifier and oscillator devices, pulsed, CW, fixed-tuned, or tunable devices in the range of 600 MHz to 2000 MHz

Cross Country Wireless SDR Receiver - SDR Receiver a compact high performance HF software defined radio receiver designed to be used in fixed or portable stations. Version 2 of the receiver is now available. It now has an RF pre-amplifier using a power MOSFET and other revisions to improve it's performance both as a stand alone receiver and as an IF panadaptor with HF and VHF transceivers.

VOACAP Online - Online professional-grade high-frequency (3-30 MHz) propagation predictions

Small Antennas for High Frequencies - This is about Small Antenna types and their properties which can help choosing proper antenna for high-frequency wireless communications as: two-way radio, microwave short links, repeaters, radio beacons or wireless telemetry

JT65-HF - Download JT65-HF Amateur Radio software for reception/transmission of JT65A protocol with an emphasis upon its usage in the High Frequency Amateur Bands.

Battery voltage booster - A battery voltage booster project with pictures and schematic by KD7W

Rechargable Battery Information - All you need to know to keep your batteries fit and well!

Voltage protector/Fuse Assembly for 100-watt transceivers - A compact voltage protector/fuse assembly for 100-watt transceivers by AD5X

CW without key clicks - High speed telegraphy without key clicks by SM5BSZ