DVB-S,DVB-S2 and DVB-S2X Downlink Link Budget Calculator

Satellite&Transponder	Double click on satellite to open "single satellite view" with lots of details
Satellite Position	equals West	Degrees
Uplink Carrier to noise (C+N/N)		dB
Satellite txp. Carrier to co-channel interference (C/Ico)		dB
Satellite txp. Carrier to intermodulation (C/Iim)		dBW/4kHz
Location
Latitude	Degminsec
Longitude	Degminsec
Azimuth		Degrees
Elevation		Degrees
Slant Range		km
Satellite delay (Up+Downlink)		ms
Antenna Diameter		Meter
Antenna Efficiency		%
Antenna Gain		dBi
Antenna Noise Temperature		Kelvin
LNB Noise Figure		dB
LNB Input VSWR	1:
Waveguide loss		dB
Polarizer loss		dB
System Noise Temperature		Kelvin
G/Tsys		dB/Kelvin
Rx Frequency		MHz
IF frequency (Universal LNB swo 11700MHz)		MHz
Downlink EIRP (from footprint)		dBW
Free Space Path Loss		dB
Atmospheric loss		dB
Symbolrate		kBaud
FEC
DVB-S2 Pilot
Information Capacity (Netto Bitrate)		kBit/s
Theoretical Information Capacity(Shannon limit)		kBbit/s
Coding efficiency based on Shannon limit		%
Modulator Rolloff
Modulator/demodulator implementation margin(DVB-S)	dB
Occupied Bandwidth		MHz
LNB/Feedhorn cross polarisation isolation		dB
Isolation between LNB outputs		dB
Multiswitch Isolation between inputs		dB
Multiswitch Isolation between outputs		dB
Allocated Bandwidth		MHz
C/No		dBHz
C/N Occupied Bandwidth(isolation not accounted for)		dB
C/N Degradation		dB
C/N Occupied Bandwidth		dB
Eb/No Nettobitrate ( TS payload bitrate)		dB
C+N/N		dB
C/N		dB
Eb/No datarate		dB
Eb/No Transmission rate		dB
Eb/No Margin		dB ( +6dB is recommended)

Rain Fade Calculations

Attenuation model ITU-R-REC-P.838 ITU Rain Zones based on R-REC-P.837

Measured C/N margin	dB
LNB noise temperature	K
Ground Noise temperature	K
Sky Noise temperature	K
Rain noise temperature	K
Ambient noise temperature	K
Antenna feed/wg loss	dB
Margin rain attenuation	dB
Margin G/T degradation	dB
Calculated rain height	km
D rain (pathlength trough rain)	km
Hight above ocean	km
Polarisation
ITU Rain zone	Find your ITU Rain Zone here
Frequency	GHz
Alfa	(for rain attenuation calculation)
K	(for rain attenuation calculation)
Max rain path attenuation	dB/km
Max rainrate	mm/hour
Rain attenuation for 99.9% availability	dB
Availability	%
Estimated rainfade outage in a year

Receiver Input Level Calculation

Power reaching Antenna	dBW
Power flux density at earthstation	dBW/M^2
LNB input power	dBW
LNB Gain	dB
LNB output power	dBmW
Cable loss	dB/100 meters ( Click on the table below)
Coax cable length	m
Coax cable loss	dB
Splitter1	number of outputs
Splitter2	number of outputs (cascaded from splitter1)
Total loss splitters	dB
Additional user defined loss	dB
Demodulator maximum power	dBmW
Demodulator minimum power	dBmW
Demodulator Input Power	dBmW
Agilent E4402B S/A Measured Input Noise Density	dBm/Hz
Demodulator Input Noise Density	dBm/Hz
Demodulator Input Level 75ohm	dBuV@75ohm RMS
Demodulator Input Level 50ohm	dBuV@50ohm RMS

White cells are outputvalues

Most receivers are specified to work between -30dBmW to -60dBmW.

Be aware that increasing the level won't help if the received carrier to noise is too low ( i.e. antenna too small).

Cable loss for some common cables - Click on the value you want to use !

Cable type	100MHz	200MHz	500MHz	900MHz	1450MHz	1750MHz	2050MHz
RG179	32.0dB	47.0dB	65.0dB	100.0dB	125.0dB	141.0dB	158.0dB
RG59/U	8.5dB	13.1dB	21.3dB	29.5dB	39.0dB	44.6dB	50.2dB
RG6/U	6.9dB	10.2dB	16.4dB	22.6dB	29.8dB	34.1dB	38.4dB
RG11/U	4.9dB	7.2dB	12.1dB	17.1dB	22.6dB	25.9dB	29.2dB

Threshold Eb/No as specified by ETS 300 421

The C/Iim and C/Ico values for Intelsat transponders can be found in IESS 410e table 1a page17 and table 2b page21.
The default C/Iim and C/Ico values are typical for Intelsat VIIA series Ku-spot beam in multicarrier mode.
For satellites with one carrier pr. transponder the typical values could be C/Iim =-30dBW/4kHz and C/Ico =40dBW/4kHz.

For Intelsat VII series satellites Ku-band the values are C/Iim =-16dBW/4kHz and C/Ico =20.5dBW/4kHz.
This are worst case values for multicarrier transponders.

Use the calculated values as a indication only and be sure there is a recommended 6dB downlink margin.

Threshold Eb/No as specified by ETS 300 421.

FEC	Eb/No[dB]	Calculated[dB]
1/2	4.5
2/3	5.0
3/4	5.5
5/6	6.0
7/8	6.4
1	9.0