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EH Antenna calculator  ^pop - Calculate eh antenna components dimension with this online form

Helical Antenna Calculator - This is my simple implementation of the ARRL Antenna Book design equations for the axial-mode helical antenna.

Helix Calc  ^updated - Helix antenna calculator, to design and make helix antenna plans

Online helix antenna calculator - PHP Helical antenna calculator, need SVG viewer

K7TJO copper pipe hentenna - Hentenna calculations and resources. Copper tubing / pipe with javascript calculator. Rectangular loop with matching section.

Moxon Rectangle Calculator - Program to calculate the dimentions of a Moxon Rectangle. All equations correlated to NEC antenna modeling software for wire diameters from 1e-5 to 1e-2 wavelengths.

Hamradioindia a website by vu2fd - a website by vu2fd with theory lessons, details on rules and regulations and planty of homebrew projects for radio amateurs, java calculators.

Massachusetts Microwave Corporation - Repair and sales of refurbished, point-to-point, digital microwave radios manufactured by Alcatel and Digital Microwave Corporation (DMC).

Massachusetts Microwave Corporation - Provider of point-to-point microwave radio system sales, service, and integration, employing refurbished name brand digital (DS1/E1, DS3/E3) and analog video radios. Specializing in Microwave Associates (M/A-COM) , Digital Microwave Corp. (DMC/Stratex) and Alcatel/Rockwell microwave radios.

Great Circle calculator - Excellent on-line java great circle calculator with perl source code and excel spreadsheet for gc calculations

USCG Navigation Center DGPS - Differential Global Positioning Service (DGPS) is a land-based augmentation system that receives and processes signals from orbiting GPS satellites, calculates corrections from known positions and broadcasts these corrections via a Medium Frequency (MF) Transmitter to DGPS users in the Broadcast Site’s coverage area.

Hamsat satellite information - Bengal amateur radio club page dedicated to Hamsat vo-52 saellite

Natural VLF Radio - Sounds of Space Weather by S. McGreevy, N6NKS

Valco Electronics - Cobra Uniden Cb Radios

Design and build helix antennas - An on-line javascript calculator and quite a few pictures to show how to make a helix antenna.

NEC-2 for MMANA - The utility "NEC-2 for MMANA" is intended for calculation of antenna models made and optimized in program MMANA and for construction and simulation of antenna models using input language NEC-2 and based on MMANA models.

ERP Calculator Plus - ERP Calculator is an Amateur Radio software utility designed to perform a side-by-side comparison of two Ham Radio antenna systems. ERP Calculator comes pre-programmed with data files including published data for several popular brands and types of coax cable as well as several popular antenna system brands and models. ERP Calculator displays values of ERP, Antenna Power Gain, Antenna Feed point Power, Antenna System Gain in dB, Antenna Gain in dBd, SWR Attenuation in dB, SWR Power Attenuation, Coax Loss in dB, and Coax Power Loss

J Pole calculator  ^{updated  pop} - Enter the operating frequency and calculate dimensions of your jpole antenna

Band Master - Band Master is a program for Radio Amateurs that downloads DX spots and displays them in different ways, including a graphical band map. It can be used either as a stand alone application or as part of a logging or contesting software via the COM/OLE interface. Rig control, country/province resolution, azimuth/distance calculator and online QRZ lookup are built-in, propagation prediction and geographical mapping are available through integration with HamCap and DX Atlas respectively.

Smith chart calculator - linSmith is a Smith Charting program, mainly designed for educational use. It allows defining multiple load impedances (different frequencies), and adding components (discrete components and line sections) in series and parallel. It plots the impedances on the screen, shows the values in table format, and is able to generate publication quality Postscript output.

Electrist - The Top-Rated Electrical and Electronic Engineering Calculator for Palm OS

RadioLink Propagation Prediction - Calculate path losses of a point-to-point radio link. Create terrain profiles using digital elevation models.

Live MUF - Freeware live MUF calculator by EA6VQ-Gabriel and G7RAU-Dave for live calculating the possible e MUF on VHF during es season via a telnet link into dxc

Coaxial Cable & Power Handling - This calculator can be used to estimate the attenuation (dB loss), power handling capability, and transmission efficiency for some of the more popular Wireless Communications and MIL Spec cables at the frequency of interest

SWR bridge - This SWR bridge works by sampling the amount of power flowing in each direction along the aerial feeder.