calculator

HF Helical Whip Calculator - Build your own HF helical whip antenna for mobile or portable operation

Slim Jim antenna calculator - How to make a simple but effective Slim Jim antenna. It includes a calculator to work out all the mesurements for the frequency you require.

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

HB9CV antenna calculator - Calculate dimension for HB9CV directional antennas

Yagi UDA Calculator - Online Yagi Uda antenna calculator

Helix Antenna Calculator  ^updated - 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

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

Cantenna Calculator  ^updated - Online calculator for Cantenna special antenna for 802.11 Wi-Fi bands

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

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.

MicroMUF - MicroMUF is a windows free HF propagation calculator that you can use to estimate the MUF (Maximum Usable Frequency) and LUF (Lowest Usable Frequency) between any two points on the Earth.

iRFC for iPhone - IRFC offers a full Radio Frequency Calculator on the go for network impedance adaptation with smith chart

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

DB Watts EIRP Calculator - Online calculator, to convert dbWatts to Watts and vice-versa, or ERP and EIRP by G4URH

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.

SWR calculator - Online VSWR Voltage Standing Wave Ratio Calculator