# What is the effective radiated power formula?

## 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.