# What is electrical length of cable?

## What is electrical length of cable?

In telecommunications and electrical engineering, electrical length (or phase length) refers to the length of an electrical conductor in terms of the phase shift introduced by transmission over that conductor at some frequency.

What is lambda in transmission line?

Wavelength is calculated by the formula λ=v/f, where “λ” is the wavelength, “v” is the propagation velocity, and “f” is the signal frequency. A rule-of-thumb for transmission line “shortness” is that the line must be at least 1/4 wavelength before it is considered “long.”

### What is the electrical length of an antenna?

The physical length of an antenna is the actual physical dimensions of the antenna. Consider a dipole antenna from the Antenna Toolbox™ with an operating frequency of 75 MHz and corresponding wavelength of 4 m.

What is electrical length formula?

The relationship between velocity, frequency and wavelength is given by the formula v=fλ v = f λ If the velocity is measured in meters/second and frequency in cycles/second, then λ has units of meters/cycle. We determine if a cable is electrically short, or long, by comparing its length to the wavelength λ.

## What is the length of long transmission line?

A long transmission line is defined as a transmission line with an effective length more than 250 km (150 miles).

What is the length of short transmission line?

Short transmission lines: When the length of an overhead transmission line is up to about 50 km to 80 km and the line voltage is comparatively low (< 20 kV), it is usually considered as a short transmission line.

### Why is electrical length in degrees?

Electrical length of the line in degrees It represents the spatial frequency of the signal. is the phase in degrees or radians (related is a time delay in seconds). can be, for example , , . is a function of frequency, because is a function of frequency.