To measure the cable loss, you should disconnect the other end of the cable from the antenna

I want to use my 2 x 20 m (130 Feet) dipole for all HF-bands except parts of 160 m with a 450 ohms ladder line feeder to minimize feeder losses

There are two categories of antennas, omnidirectional and directional

A previous model, fed with 300-ohm twin-lead and a t-match, had just beentaken down due to the unsatisfactory performance

New and improved 9 to 1 linear matching transformer that is used on the radio end of the feedline

There are applications where a particular band, or spread, or frequencies need to be filtered from a wider range of mixed signals

This document tries to clear out some details of transmission lines and cable inductance

Una linea in aria come quella ha perdite davvero piccole, anche in regime di onde stazionarie

In pratica si usa un analizzatore d'antenna, tipo: AA-54 o MFJ269 o qualsivoglia altro, un T ed una terminazione uguale all'impedenza caratteristica dell'analizzatore

A quarter wavelength of rg-58/u (vf = 0.66) at 7.040MHz would be 23.06ft in length

Return loss is a measure of vswr voltage standing wave ratio, expressed in decibels db. the return-loss is caused due to impedance mismatch between two or more circuits

Understanding common mode and differential mode currents on transmission lines

Stacking antennas and phasing them together is not as hard as you may think

Delta delivers precision interconnect and innovative solutions

Rf and microwave components such as coaxial attenuators, adapters cables, connectors

RF coax connectors are designed to transmit analog signals while minimizing radio frequency RF signal losses

A tutorial in use of Velocity factor solver to find the velocity factor of a sample coaxial transmission line using an antenna analyser

First let's dispel the greatest myth in antenna theory antennas must be resonant to be efficient baloney! It just ain't so!

I'd like to show you how i solved this problem, quickly and cheaply, and to great effect

With a few simple tools and a little effort you can make your own open-wire line that is superior in many ways to the window line that is commonly sold by antenna product vendors

is at about 57 feet 17.4m and the feeder is about 60ft 18.3m long almost vertical but comes into the house about 3 ft above ground level

A new cable outlet to an outside wall and wanted to find out what kind of drill bit is needed to drill through and feed the coax cable

About having as good an antenna system as you can manage to get the best out of six metres

Modern solid state radios expect a load impedance of 50 Ω, resistive connect them to an antenna the feed-point impedance of which can be anything

The end-fed half-wave antenna can function alone, but feed lines are the norm regardless

Normally there is no need to retune the matchbox when using Ladder-Line

A transmission line is a device designed to guide electrical energy from one point to another

I have hundreds of silver plated pl-259s in service at my station, they are all soldered the same way

To calculate the impedance required for a 1/4 wave electrical section of line

A λ /4 line is, in effect, a transformer, and in fact is often referred to as a quarter-wave transformer

For feeding the rx inputs of both my elecraft k2 and tentec orion with the same rx antenna, i'm in need for an antenna splitter

A coaxial RF connector radio frequency connector is an electrical connector designed to work at radio frequencies in the multi megahertz range

To rfcomp.com If you require an RF component

La linea a scaletta o ladder line o linea bilanciata è uno dei segreti nascosti nel felice impiego di antenne multibanda non risonanti

Solution for this is to use a line isolator between the tuner and the coax feeder

The effects of vswr called the voltage standing wave ratio, or vswr, of an antenna system, there is a lot of good information available on vswr as well as a lot misconceptions

450 ohm Ladder Line requires a 9:1 balun in order to match to a 50 ohm line

According to the transmission line theory, the formulas used by the corresponding columns, are as follows

Rg-213 shop-bought at considerable expense; radiates rf when mismatched, typical loss: 4.8db / 100m @ 30MHz. ladder line: easily constructed for a few cents per meter; radiates very little rf even when severely mismatched; typical loss: 0.33db / 100m @ 30MHz

This transmission line calculator calculates the impedance at input and attenuation of a given transmission line once terminated with the given load

Coaxial Cable Attenuation Loss Calculator in dB

Coaxial cable impedance calculator allows you to enter the outer diameter dielectric width, inner conductor diameter width and either the dielectric constant

Calculates the resistance, inductance and capacitance per unit length of common low-loss transmission line configurations

450-ohm ladder line constructing high-quality ladder line

This tool is designed to calculate the inductance of two parallel wires

A quarter wave transformer is used to match two transmission lines with different impedancesA quarter wave transformer is used to match two transmission lines with different impedances