Dish Diameter

Apply minor diameter when using an offset dish

Effciency

Normally 40 to 70%

Frequency

The gain of the antenna depends on the frequency

Antenna Gain

If you know the gain but not the efficiency, vary efficiency until you get the correct gain

Antenna Noise Temperature

Normally between 0 - 50.

Feed loss

Normally between 0 - 0.5 dB.

LNB Noise Figure

Normally between 0.7 - 1.2 dB.

Gain LNB

Normally between 40db - 60db. To avoid intermodulation products use as low gain as possible without raising the system NF.

Cable loss

Cable loss between LNB and the IF amplifier.

IF amplifier noise figure

When not using an IF amplifier, apply 0 dB.

IF amplifier Gain

When not using an IF amplifier, apply 0 dB.

Cable loss B

When not using an IF amplifier, apply 0 dB.

Receiver Noise Figure

See the specifications of your receiver.

System Noise Figure

Calculated in the System Noise figure section

Antenna Gain

The gain can be calculated from antenna size and efficiency in the Antenna Gain section.

G/T

G/T is a measure of the performance of your system

EIRP

Get the EIRP from the footprint of the satellite.

Dish Diameter

Apply minor diameter when using an offset dish.

Antenna Efficiency

If you only know the gain, you can calculate the efficiency in the Antenna Gain section.

Antenna Noise Temp.

See the specifications of your antenna. Normally between 0 - 50 K.

System Noise Figure

Use System Noise Figure section to calculate correct value.

Bandwith

Bandwith of the receiver.

Distance to satellite

Calculated in the Antenna Alignment section(Default value 39560 km).

Rain

Calculations applies to the Ku-band.

Noise figure

The noise can be described in noise figure or noise temperature

Noise Temperature

The noise can be described in noise figure or noise temperature

Latitude

Latitude of dish location.

Longitude

Longitude of dish location.

Satellite position

Satellite position.

Azimuth angle

How to align the dish by the compass.

Polarization angle

Note that ASTRA satellites differ from standard polarization.

Elevation angle

Angle of inclination.

Distance to satellite

Needed for C/N calculation.

Terms and Conditions

When using this App (SMWlink software) you have accepted the following terms and conditions.

SMWlink is provided ”as is” and it is only to be used as an advisory tool for approximations.

Swedish Microwave AB and its SMWlink project partners assumes no responsibility or liability for losses, financial or other, neither direct, indirect nor consequential, resulting from the use of SMWlink software and its calculations.

SMWlink software and source code are the intellectual property of Swedish Microwave AB and must not be copied as a whole or in parts without prior written consent..