Coaxial Cable Dimensions Calculator

The antenna is designed to be fed with 50 or 75 ohm coax cable of most any length with a balun.

Coaxial cable dimensions calculator. The length of the coaxial cable is the center of many debates that 18 wheeler drivers have over the c. This is typically in a raceway cable tray or conduit in a cable burried in the earth or in open air. Distance enter the one way length of the wires in the circuit in feet. To determine the proper length of coax.

The feed z xmitter end is 40 45 ohms j 0. I was thinking of using rg 11 foam. It is best to use coax in multiples of 25 50 or 1 wave length of the center frequency of the antenna you are connecting to. Pasternack s coaxial cable impedance calculator allows you to enter the outer diameter dielectric width inner conductor diameter width and either the dielectric constant or velocity of propagation vop values in order to calculate the impedance of the coax.

Online coax cable loss antenna gain calculator. This antenna is 140 ohms or so both on 14mhz and 18 mhz. Enter gain of antenna in dbd. Here you can see that the total length of cable being used is 19 5m which is 7 half wavelengths taken from the multiple 1 2 wavelengthstable with a single 1 4 wavelength added as shown in the coaxial length calculator.

The wire size can range from 16 awg to 12 awg. Voltage drop choose the maximum percentage of the source voltage drop. Compliments of the c. For vhf 2m the center frequency is about 146mhz.

A calculator to determine the proper length coax to use in your vehicle. How long should my coax cable be. Always check with a coaxial cable vendor for values specific to the type you plan to use. Clinics of america dot com inc.

The calculator will only return data for frequencies below the cutoff frequency or fco of the cable. Actual measured values may vary from the calculated values based on manufacturing tolerances cable assembly length connector performance actual operating frequency and measurement accuracy. Place a 1 1 balun on the antenna end of the feedline. Cable loss antenna gain calculator.

The 75 ohm coax is 216 ft long vf 82 guesstimated and is a perfect 1 4 multible for 17 and 20 meters. Enter power into cable in watts. Note that attenuation values are given at 400 mhz but can and do often have significantly different values at other frequencies. The calculator says i would gain 1db or less by changing coax.

The larger the wire the wider the bandwidth. At the desired operating frequency. Bookmark or favorite this coaxial cable impedance calculator page by pressing ctrl d. Properties of popular coaxial cables.

Using the league table you can see that the db loss for 100m of lmr 600 coax at 50 150mhz is 1 8db. Enter length of cable in feet. It is recommended not to exceed a voltage drop of 5. This is derived for the 2m vhf of amateur allocation 144 mhz 148 mhz.

The measurements below are for building a simple dipole antenna. I am feeding it with rg 6 tv foam coax.