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Online Antenna Analysis and Design Software  ^updated - Free online software to calculate wire antenna power patterns, directivity, input impedance using method of moments.

HF Beam Calculator - Calculate the Measurements for a 2 or 3 ele Beam

Cubical Quad Antenna Calculator - Easy Quad calculator, enter center frequency to get a quad antenna size

Beverage Transformer Calculator - W0FMS Two-Wire Beverage (SWA) Transformer Calculator

Horn Antenna Designer - 802.11b Horn Antenna Designer, calculate horn antenna dimension for wi-fi application

HB9CV antenna calculator - Calculate dimension for HB9CV directional antennas

Yagi UDA Calculator - Online Yagi Uda antenna calculator

Helix Antenna Calculator - Online helix antenna designer, calculate size of helix antennas online

Discone Antenna Calculator - Calculate dimension for discone antennas online

HF Helical Whip Calculator - Calculating HF helical whip antenna for mobile or portable operation

VHF Yagi Balcony Mast - An Antenna Mast Idea for a VHF/UHF antenna

Decibels Explained - What decibel mean in RF Gain and how used DB Values in Gain calculation

T Match efficiency estimator - This calculator estimates the efficiency of a T match tuner using a simple loss model.

BiQuad Antenna calculator  ^updated - Online calculator for Bi-Quad antennas

QRA Calculator  ^updated - Converts your Lat/Long into an IARU Locator

NOAA Solar Calculators - Improved Solar Calculator, Old Sunrise/Sunset and Solar Noon Calculator, Solar Position Calculator

ICNIRPcalc - ICNIRPcalc allows you to calculate safety distances for many know amateur radio antennas with respect to ICNIRP limits by DL9KCE

Magnetic Loop Software - Loop Calculator and Capacitor Design Software

Coil32 Priority listing - Coil32 is a free coil inductance calculator, that allows to calculate: single layer and multi layer air core coils, toroidal air core coils, inductors on ferrite rings, in pot core, flat coils on the PCB, and also LC resonance parameters. The program have additional plugins to calculate another kinds of coils. The application is free for usage and distributing.

Winlocator - Winlocator 8 for calculate QTH Locator with map. Data base with Country, Capital, Ham prefix etc In French

Microphone sensivity calculators - Mic online calculator , Microphone Dynamic Range Calculator, Microphone Sensitivity Calculator

dbm Calculator - The dbm online calculator and reference table for 50 Ohm

RF Safety Compliance Calculator - This program is intended for far-field calculations, Calculate Estimated Power Density based on several factors.

A Simple Radio Receiver - Development of a simple modular radio receiver

SWR calculator - Online VSWR Voltage Standing Wave Ratio Calculator