simple calculator circui

Coaxial cable dipole for 80m - Here are some simple antennas you can build along with calculators to help you get the right length.

Small Transmitting Loop Antenna Calculator Priority listing - A free online calculator for making all of the calculations required to design and build small transmitting loop antennas, also known as magnetic loops by 66pacific.com

Dipole and Inverted V Antenna Calculator - Enter the resonant frequency for the dipole/vee antenna calculation

WB4BXW Diople Antenna Calculator - Dipole and inverted vee antenna calculator sufficiently accurate for wire antennas up to 30 Mhz

Axial-Mode Helical Antenna Calculator - Simple implementation of the ARRL Antenna Book design equations for the axial-mode helical antenna.

Helix Calculator - JavaScript Implementation Written by Fred Spinner, W0FMS

Quarter Wave GP Antenna Calculator - Amateur quarter wave ground plane antenna calculator

Quadrifilar helicoidal calculator - Calculate design for a quadrifilar helicoidal antenna

Loop antenna resonant frequency calculator - Calculates resonant frequency of a loop antenna, correcting for distributed capacitance.

Dipole Calculator in JavaScript - Input the desired resonant frequency and it will calculate lenght in inches feet and meters

A Simple 7 element Yagi calculator  ^{updated  pop} - A JavaScript to calculate the dimensions for a seven element Yagi-Uda Antenna

W4HN Antenna Calculator - Calculate your dipole, 3 element yagi and a simple dipole

Short Whip Antenna Tuner - Here is a circuit that will resonate a short whip antenna for the HF Bands.

Build a Tuned Loop - How can you vastly improve your Medium Wave reception? its quite simple really, all you need is 120 foot of wire, a few lengths of timber and an old tuning capacitor with which you can build the answer to every DX'ers prayers, a tuned loop antenna.

ZL1BPU Rotator Controller - A very simple controller circuit, with fairly smart performance! The ZL1BPU Rotator Controller has been designed as an add-on unit for the popular Kenpro KR-400 and Yaesu G-400 rotators. The controller consists of a small circuit board which fits inside the rotator control box (see picture).

E-Z Tube aluminum - E-Z Tube aluminum tube is a versatile, light duty construction system that offers a cost effective and simple method of constructing aluminum tube frames.

K6XX CW Indicator Kit - The purpose of this circuit is to light a LED in your radio when you tune to within +- 20hz of a cw signal. This makes for easy tuning of a cw signal by eye rather than by ear

Text to Morse converter - A simple text to morse and morse to text online converter

Antenna lookangles calculations - A javascript satellite antenna look angles calculator

RF Circuit design basics - Ebook by Akira Matsuzawa Tokyo Institute of Technology, Building blocks in RF system and basic performances, Device characteristics in RF application , Low noise amplifier design, Mixer design and Oscillator design

Target 3001 PCB Design - Represents a new generation of CAD/CAE software for circuit design. Has been created to meet the requirements of professional design engineers.

AA Battery Solar Charger - This almost trivial circuit may be used to charge a pair of AA or AAA sized rechargeable battery cells from sunlight.

Free Sun Power - Free basic and advanced system design tutorials for every component and aspect of solar power. Plus system sizing calculators, battery bank calculators and wire size calculators

Electrical Calculators Online - Electrical and electronics online calculators by Calculatoredge.com

A reliable VOX PTT circuit - This VOX PTT has been designed with Echolink in mind, but it will work equaly as well with repeaters