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Online Dipole Antenna Calculator - Online calculator and construction instructions

Quad Maker - Quad maker designing and calculating quad dimension. Excel spreadsheet

VSWR Loss Calculator - This calculator is designed to give the efficiency loss of a given antenna, based on the input of VSWR (voltage standing wave ratio) and other subsequent factors

Antenna Loading Coil Calculation  ^updated - The calculation refers to either a loaded 1/4 wave or a loaded dipole,

Coil Designer - Mk 2 - This page lets you do calculations for single layer air cored coils using the solenoid formula

4:1 coax balun design - Online calculator for a 4 to 1 coax cable balun

RF Transmission Line Loss Calculator - This calculator computes the matched line loss for a transmission line using a model calibrated from data for the transmission line types built in to the calculator. It also gives an estimate of the mismatched loss if the mismatch is specified.

CantennaCalc - Kioan's calculator for building a Cantenna , directional waveguide antenna for long-range Wi-Fi

N0EQ Trashbeam - A 2m, 6 element beam built from neighborhood garbage

Dialcover - Bill Turner dialcover site, dial cover replacements for antique radio restoration

DL4UNY - Working from a small apartment-balcony on all bands with a small antenna

AntennaCompass Station Bearings - Antennacompass.com will calculate the distance and bearing for Ham, TV, FM, AM, and Shortwave stations and plot it on a compass like display.

D-PRS Message Calculator - This page calculates the necessary GPS message (C1 message on most Icom radios) to use your Icom radio in GPS mode (not GPS-A mode) with D-PRS.

Calculate azimuth and elevation - Use this online calculator if you need to know your azimuth/elevation relative to a satellite

Antron A99 reviews - Solarcon A99 antenna operates 10 thru 17 Meters with Tuner. Reviews and comments from a99 owners

Microwave Antenna Design Calculator - Available to run on all major operating systems, this free calculator provides quick estimation of antenna size required for a given gain and frequency.

Cantenna Calculator - A circular waveguide calculator for designing cantennas include source code and windows executable by lincomatic

SuperSmith - Program to mechanize Smith Chart operation This graphics-intensive program is a valuable transmission-line calculator for both advanced and beginning users. Based on the venerable and highly intuitive Smith chart, it provides high-accuracy computations without recourse to paper, compass or straightedge.

Radio Works - RadioWORKS is a tool for calculating various items related to radio waves and radio wave propagation. Get detailed information about a frequency, such as the free-space wavelength, band classification, propagation methods, common transmitter configurations, etc. Calculate antenna lengths or frequencies. View a 3D coverage map by providing a latitude / longitude coordinate and transmitter height.

Javascript Programs for Amateur Radio - GØHZK javascript calculators for ham radio, distance calculator, locator calculator, UTM calculator

Ham for iPhone - Ham is a free iPhone Ham Radio utility. View solar conditions (Solar Flux, Indices, X-Rays, Sunspots and calculated band conditions). View PSKreporter reports and Callsign lookups.

Power amplifier for 2m rig - An RF power supply for 144 MHz schematics and instructions

Resonant Frequency Calculator - This web based application will compute circuit values required for an L-C circuit to resonate at given frequency. Also it will compute the resonant frequency if given values for L and C.

Electronic calculator - Some simple electronics calculator in javascript

Return Loss, SWR, Power Gain and Loss Calculator - A neat tool for your daily ham activities around the shack