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Use this online calculator to determine the length of a quarter-wave antenna from the frequency. Both metric and English units of measurement are supported.

Use this online calculator to determine the length of a full-wave loop antenna from the frequency. Both metric and English units of measurement are supported. Quarter-wave matching section lengths are also calculated.

Use this online calculator to determine the length of a dipole antenna from the frequency. Both metric and English units of measurement are supported.

ICNIRP is a calculator software that allows you to determ safety distances for many know amateur radio antennas with respect to ICNIRP limits developed by DL9KCE

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

Online calculator and a full documented pictorial guide to build a single sided 8 slot waveguide antenna

This article includes an online calculator for a 3 element Yagi Antenna. The formula and basics theory of Yagi Antenna are also explained with examples.

Types of coax-cable with rf attenuator calculator, line loss calculator form includes an antenna gain calculator. This coax loss calculator can help you on choosing the right cable for your antenna sysmte.

EmeCalc predict your own Moon echo, level of Sun noise, moon noise and more by VK3UM

Online calculator, Butterworth Bandstop (Notch) Filter Designer

Calculate the value of an unknown resistor with this free program for windows

An excel spreadsheet that in a really simple way checks how much to trim your antenna elements. Download the xls file and watch the presentation video include in this page

The collinear antenna, or Marconi-Franklin antenna, is an omnidirectional, high-gain antenna composed of in-phase half-wave dipoles aligned vertically. By using quarter-wave transmission line segments, it maximizes gain at a low horizon angle, outperforming a half-wave dipole. Adding segments increases gain but narrows bandwidth. A popular DIY version, the CoCo antenna, uses half-wave coaxial cable segments connected by non-radiating transmission lines. Built with stable velocity factor cables, a matching quarter-wave sleeve balun, and ferrite rings for attenuation, the antenna achieves performance comparable to commercial models.

A collection of calculators, contest schedules, references, databases and more for Palm OS by KB7AVT

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

Design a parallel circular wire balanced transmission line with this online calculator. This calculator is a tool for designing balanced transmission lines with a specific desired characteristic impedance Zc and made of parallel circular conductors of a given diameter d.

This calculator is designed to give the critical information of a particular beam antenna, in this case a three element Yagi, for the frequency chosen.

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

HF Beam Calculator for Amateur Radio and CB Communications

Calculate vertical array pahse antenna accorting to the Christman technique

Passive Band-Pass Filter, low-pass filter calculator

Aka Circular Waveguide Antenna. This online antenna calculator let you plan your cantenna for the desired frequency of operation, giving the Can diameter you have available.

Understanding power measurements in RF systems is crucial for amateur radio operators, particularly when evaluating antenna performance or transmitter output. This online resource provides a _dBm calculator_ and a comprehensive reference table specifically tailored for 50 Ohm impedance environments. The calculator allows users to convert between dBm, milliwatts (mW), and volts (V), facilitating quick power level assessments. It clarifies that dBm represents a logarithmic ratio with a reference power of **1.000 milliwatt**, equating to 0 dBm. The accompanying reference table extends this utility by presenting a range of pre-calculated values, which can be particularly useful for field operations or rapid design checks without needing to perform manual calculations. The resource distinctly focuses on the practical application of dBm in amateur radio contexts.

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

Calculate how to set call signs

The program can be used to calculate inductors (coils) and their number of turns on ferrite cores, ferrite shells and air coils. These can be used for baluns, Ununs, bandpass filters, low pass filters, resonant circuits, and more. The technical specifications of the cores are already integrated in the program. Application is free and runs on Windows 32 bit versions only. To make it run on Windows 10 64 bit need to be unzipped in a single folder.

The calculator designs the Yagi-Uda antenna based on the DL6WU model with boom correction, following the G3SEK-DL6WU method. It optimizes the antenna for maximum gain and allows adjustment of passive elements without affecting SWR. DL6WU antennas are known for their high gain, minimal sensitivity to nearby objects, and stable performance in various weather conditions.

1.5 dB of matched line loss can be calculated for a given transmission line using this online tool, which employs a model calibrated from empirical data. The calculator allows radio amateurs to input specific transmission line types, such as _RG-8_ or _RG-58_, and then determine the expected signal attenuation. This is crucial for optimizing antenna system efficiency and understanding power delivery to the radiating element, especially for HF and VHF operations where feedline losses can significantly impact performance. Beyond matched loss, the calculator also provides an estimate for mismatched loss if the Standing Wave Ratio (SWR) is specified. This feature helps operators quantify the additional power loss due to impedance discontinuities between the transceiver, feedline, and antenna, which is a common concern in amateur radio installations. Accurate loss calculations are vital for effective station design and for predicting actual radiated power. The tool's utility extends to various operating scenarios, from fixed station setups to portable deployments, aiding in the selection of appropriate feedline lengths and types to minimize signal degradation. Understanding these losses is a fundamental aspect of maximizing the effectiveness of any amateur radio antenna system.

Online coax cable impedance calculator

Online VSWR Voltage Standing Wave Ratio Calculator

This LPDA calculator is based on the design procedure as described by L. B. Cebik, W4RNL (SK) in the 21st edition of The ARRL Antenna Handbook.

This is an on-line rf attenuator calculator provided free in order to promote the FLEXI-BOX. Calculates the resistor values, attenuation, minimum attenuation, impedance, reflection coefficient, VSWR and return loss of a matching Pi attenuator

Inches and meters Javascript Wavelength Calculator allow to input a frequency in MHz and calculate wavelenght in several units considering also fractions of wavelenght and the velocity factor. Includes an usefull inch to meter converter

Online calculator for Input coil data, LC Resonant Frequency and L match

The program consists of tabbed pages for various antenna and transmission line calculation. You can compute the values for an inverted L network that will allow you to match the 50 ohm output of the radio, or you can compute the necessary length in the units of choice for a 5/8 wave vertical for 10 meter band.

Online calculator for J-Pole antennas. The J-pole antenna consists of a short and a long vertical pole with a feed point near the bottom. The antenna looks like the letter J, hence the name J-pole antenna.

Electrical and electronics online calculators by Calculatoredge.com

More than 130 currencies are supported by the _Universal Currency Converter_, a digital utility designed for real-time foreign exchange rate calculations. This tool is particularly useful for radio amateurs traveling internationally for DXpeditions, contests, or hamfests, allowing them to quickly ascertain local currency values against their home currency, which can be crucial for budgeting and transaction planning in unfamiliar territories. The platform also facilitates international money transfers to over 190 countries, providing features like rate alerts and historical currency rate analysis. Users can track exchange rate trends over days, weeks, or years, and receive daily market analyses via email updates. Additional functionalities include an IBAN calculator for validating bank account numbers and an API for integrating real-time currency data into other applications. The service is widely trusted, with **4.8** ratings on both the App Store and Google Play, reflecting its reliability for global financial transactions.

Select the toroid by material type and dimension of the toroid, the desired inductance and you will get the numbers of turns

Online Constant - k Lowpass Filter calculator

Butterworth Highpass Filter Designer

Mic online calculator , Microphone Dynamic Range Calculator, Microphone Sensitivity Calculator

Online HB9CV antenna calculator, accept as input the desired resonating frequency and provides dimensions for spacing and length of each element, including boom and radiator diameter.

This online calculator will give as output the Inductance L of a coil, including the total lenght of the wire needed to wound the coil. As input, requires the Diameter, number of turns, wire diameter and turn spacing

An online multiple calculator of 16 impedance matching networks

Calculate atmosphere absorption attenuation, an EME tool by WK3UM

GoGreenSolar provides comprehensive solutions for **DIY solar panel systems**, catering to both homeowners and professionals seeking energy independence or reduced utility costs. Their offerings include a variety of solar kits such as Grid-Tie, Off-Grid, and Battery Backup configurations, designed to integrate seamlessly with existing utility infrastructure or provide complete autonomy in remote locations. Customers can select from Microinverter or String Inverter kits, along with essential components like **solar panels**, inverters, batteries, and racking systems, all curated from reputable brands known for efficiency and durability. The company emphasizes end-to-end support, from initial consultation and custom system design to providing easy-to-follow installation manuals. They offer financing options, including quick-approval loans with zero down payment, and a money-back guarantee if a solar permit is not approved. The platform also features a solar calculator and a questionnaire to help users determine the most suitable system for their specific energy requirements and property characteristics. GoGreenSolar aims to simplify the solar adoption process, enabling significant savings on energy bills and labor costs. Their approach focuses on empowering users to install their own systems with expert guidance, ensuring optimal performance and a secure energy future for homes and businesses.

This calculator ask as input diameter, lenght turn and frequencu and will return L and Q

A free Labview antenna calculator program. This interesting calculator for small loop antennas can be ran on most recent Windows versions using the Labview runtime.

You can shorten a vertical antenna by using a loading coil. This online calculator tells you how the amout of inductance your loading coil will need to have.