# What is the effective radiated power formula?

Table of Contents

## What is the effective radiated power formula?

Calculation: E.I.R.P. = 16 dBm + 8 dBi – 3,2 dB – 1 dB = 19,8 dBm (i.e. the power level meets the requirements – less than 20 dBm).

## What is the effective radiated power of a repeater with 200w?

The effective isotropic radiated power of a repeater station with 200 watts transmitter power output, 2-dB feed line loss, 2.8-dB duplexer loss, 1.2-dB circulator loss and 7-dBi antenna gain is 252 watts….Extra Class question of the day: Effective radiated power.

dB | Ratio |
---|---|

2 | 1.585:1 |

3 | 2:1 |

## How do you calculate ERP?

To calculate ERP, Take the transmitter power output, subtract the losses from the duplexers, subtract any measurable feedline loss and add the antenna gain. Example: (2 dBd combined duplexer and feedline loss) + (5 dBd antenna gain)= 3 dBd gain.

## How is RF ERP measured?

ERP measures the combination of the power emitted by the transmitter and the ability of the antenna to direct that power in a given direction. It is equal to the input power to the antenna multiplied by the gain of the antenna.

## What is effective isotropic radiated power?

EIRP (Effective Isotropic Radiated Power) is the measured radiated power of an antenna in a specific direction. It is the output power when a signal is concentrated into a smaller area by the Antenna. The EIRP can take into account the losses in transmission line, connectors and includes the gain of the antenna.

## How do you calculate a fade margin?

Adjacent channel interference fade margin is calculated as the difference between the median signal level and the total adjacent channel interference level, minus the required desired carrier-to-adjacent channel interference level to achieve acceptable performance.

## What is the effective radiated power of a repeater with 450w?

What is the effective radiated power of a repeater with 450 W transmitting power output, 4 dB feedline loss, 6dB duplexer loss, and 7 dB circulator and feedline loss and antenna gain of 25 dB? Solution: 156.

## What is antenna gain in RF?

Antenna gain is the ability of the antenna to radiate more or less in any direction compared to a theoretical antenna. If an antenna could be made as a perfect sphere, it would radiate equally in all directions. Such an antenna is theoretically called an isotropic antenna and does not in fact exist.

## How many DB is a watt?

Definition: dBW means dB relative to 1 watt, so 0 dBW = 1 watt, -3 dBW = half watt. +3dBW = 2 watts etc. Definition: dBm means dB relative to 1 milliwatt, so 0 dBm = 1 milliwatt (one thousandth of 1 watt or 0.001 watt). Also equal to -30 dBW….dBm and milliwatts mW.

dBm scale | milliWatts |
---|---|

-10 dBm | 0.1 mW |

## What is difference between EIRP and ERP?

EIRP is the Effective isotropic radiated power is the total power radiated by a hypothetical isotropic antenna in a single direction. ERP is Effective Radiated Power is the total power radiated by an actual antenna relative to a half-wave dipole rather than a theoretical isotropic antenna.

## What is ERP in RF?

The effective radiated power (ERP) of an antenna in a specific direction is the power that will need to be supplied to a reference antenna to produce the same power this antenna is producing in this direction.

## How is transmit power calculated?

If PR is the received signal power and PT is the transmitted power, then in free-space propagation, P R ∝ G × P T f 2 × d α , where f is the carrier frequency, d is the propagation distance, G is the power gain from the transmit and receive antennas, and α = 2.

## What is the difference between EIRP and ERP?

The difference between EIRP and ERP is that ERP compares the actual antenna to a half-wave dipole antenna, while EIRP compares it to a theoretical isotropic antenna. Since a half-wave dipole antenna has a gain of 1.64 (or 2.15 dB ) compared to an isotropic radiator, if ERP and EIRP are expressed in watts their relation is

## How to calculate EIRP?

EIRP Formula : EIRP = P T – L C + G a Where, P T = Output power of the transmitter (dBm) L C = Cable loss (dB) Ga = Antenna Gain (dBi) Effective Isotropic Radiated Power Calculation Step 1: Lets consider an example Output power of the transmitter is 27, Cable loss is 12 and Antenna Gain is 45. Step 2: Substitute the values in the formula, EIRP = 27 – 12 + 45

## How can I calculate EIRP?

EIRP Formula : EIRP = P T – L C + G a. Where, P T = Output power of the transmitter (dBm) L C = Cable loss (dB) Ga = Antenna Gain (dBi) Effective Isotropic Radiated Power Calculation. Step 1: Lets consider an example. Output power of the transmitter is 27, Cable loss is 12 and Antenna Gain is 45.

## What is the formula for ERP?

The formula for calculating ERP is: ERP = Transmitter Power * Feedline Loss * Antenna Gain. For example, if you hooked your 2 Watt MURS handheld to a 3dB gain rooftop antenna, thru a 50ft. coax cable having a total loss of -3dB, the gains and losses would cancel, and you would have an ERP of 2 Watts.