Coaxial Cable Dimensions Calculator

Online coax cable loss antenna gain calculator.

Coaxial cable dimensions calculator.

Properties of popular coaxial cables. Place a 1 1 balun on the antenna end of the feedline. Always check with a coaxial cable vendor for values specific to the type you plan to use. Distance enter the one way length of the wires in the circuit in feet.

The measurements below are for building a simple dipole antenna. This antenna is 140 ohms or so both on 14mhz and 18 mhz. The feed z xmitter end is 40 45 ohms j 0. The 75 ohm coax is 216 ft long vf 82 guesstimated and is a perfect 1 4 multible for 17 and 20 meters.

The wire size can range from 16 awg to 12 awg. The length of the coaxial cable is the center of many debates that 18 wheeler drivers have over the c. 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. 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.

Enter gain of antenna in dbd. A calculator to determine the proper length coax to use in your vehicle. Enter length of cable in feet. Compliments of the c.

The antenna is designed to be fed with 50 or 75 ohm coax cable of most any length with a balun. For vhf 2m the center frequency is about 146mhz. I was thinking of using rg 11 foam. How long should my coax cable be.

Enter db loss of cable per 100 ft. Cable loss antenna gain calculator. Using the league table you can see that the db loss for 100m of lmr 600 coax at 50 150mhz is 1 8db. 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.

To determine the proper length of coax. It is thought to be accurate but it is the responsibility of the user to verify the accuracy of. The larger the wire the wider the bandwidth. This program is provided as is.

Clinics of america dot com inc. At the desired operating frequency. The calculator says i would gain 1db or less by changing coax. The calculator will only return data for frequencies below the cutoff frequency or fco of the cable.

This is derived for the 2m vhf of amateur allocation 144 mhz 148 mhz. This is typically in a raceway cable tray or conduit in a cable burried in the earth or in open air. It is recommended not to exceed a voltage drop of 5. Actual measured values may vary from the calculated values based on manufacturing tolerances cable assembly length connector performance actual operating frequency and measurement accuracy.

Note that attenuation values are given at 400 mhz but can and do often have significantly different values at other frequencies. Voltage drop choose the maximum percentage of the source voltage drop.