high voltage

Portable 70cm Quadruple Quad Beam - A suitable high gain 70cms antenna for SOTA operation was sought that did not have the drawbacks of a long Yagi antenna, principally a narrow beamwidth and bandwidth.

Errante's virtual ground balun - Errante's virtual ground Balun, a state-of-the-art high power HF balun family.

How to Make a Great 9:1 RX Transformer - There are lots of good designs for matching transformers for receiving antennas. Make it yourself it's cheap and easy, and very high performance. This is the design used in the TRX-9 transformers.

From Transmitter to Antenna - A collection of articles on the subject of impedance, impedance matching and high-frequency power transmission by G3YNH

Matching Waves, VSWR at work - When the radiation resistance (voltage to current ratio) of an antenna is the same value as the characteristic impedance of the transmission line (voltage to current ratio in the line), all of the electrical energy transmitted down the line is taken by the antenna and radiated into space in the form of a radio wave.

Te RADAR grou - The RACES ARES Disaster Assistance Repeaters (RADAR) group was formed by a team of amateur radio operators dedicated to providing high quality repeater communications for amateurs involved in public service communications or response to emergency/disaster situations.

HamRadioHelpGroup - This group is dedicated to those who are interested in getting started in amateur radio or upgrading to a higher class license

HiZ-Antennas - High impedance amplifiers for shortened vertical antennas, Array matched and Optimized 15dB Preamplifier

SES Flexcharge - Ultra High Efficiency Alternative Energy System Controllers

I0JXX - The I0JXX is an italian company that offers market their projects, also sells electronic products of high quality, both for Ham, both Broadcast and their accessories. VHF Antennas, mosfet power amplifiers, filters, insulators, power dividers, telescopic poles, antenna masts

Outbacker antennas - Outbacker mobile and portable antenna systems are slim line, highly efficient, single whip multi bond antennas for vehicular and limited space portable applications.

FMI - FMI provides superior solutions in the design and manufacture of frequency control devices including Voltage Controlled Temperature Compensated Crystal Oscillators (VCTCXO), voltage controlled crystal oscillator (VCXO), Temperature Compensated Crystal Oscillators (TCXO), crystal clock oscillators, high temperature oscillators, surface mount and crystal oscillator products, phase locked sources and more.

M3 Electronix - Offers high quality electronics test equipment, in kit form, to enhance the test bench of any technician or hobbyist. Our goal is to provide reliable, affordable products with unmatched technical support

High Altitude Ballons

Suntracker: Wayne State University - Suntracker : high altitude, balloons, weather station, stratosphere, solar cells

Treasure Valley Near Space Program - Lighter, cheaper, higher. let's do launch!

UND High-Altitude Balloon Project - University of North Dakota High Altitude Balloon Project

BOREALIS - The Montana space grant consortium high altitude balloon program

Mobile Installation notes - Some do's don'ts & advice by Brian MW0GKX.

Technology Systems - Supplier of Heathkit documents, full high quality manuals fom NEW manuals, full catalogs all pdf format. Schematics and 1000 pictures

ADIF Master - ADIF Master is a highly user configurable Windows application for working with HAM radio logbooks. ADIF Master allows to convert any existing Cabrillo, TR, CT logs or a part of it into an ADIF file. Also you can use ADIF Master to open and modify existing ADIF logs using customizable filters, add, remove and modify ADIF tags and entries

Battery Equivalents - Cross reference thousands of consumer, watch and Amateur Radio Handheld batteries

Microphone Wiring Pin Outs Priority listing - Amateur radio microphone wiring schemes for over 770 radios from 48 manufacturers

Kenwood MC-50 modification - MC-50 microphone modification for high emphasis

The Adjustable Voltage Regulator - N1HFX article on adjustable voltage regulator