Communications Calculators

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dB Calculator
() + dB) = ()
 
Enter the number of watts or dB and the amount of dB to add or subtract. The result will be displayed on the right side of the equation. After entering a value, tab (or click) and the calculation will occur.

 

VSWR & Return Loss Calculator
VSWR: :1 Return Loss: dB Through Loss :dB
Enter either the VSWR ratio or the Return Loss and the other will be calculated. Through loss is a calculated field only. The calculation will occur when you either tab off the field or click the form.

Coupler Calculator
Coupling Loss : Through Loss :
Enter either the Coupling Loss or the Through Loss and the other will be calculated. The calculation will occur when you either tab off the field or click the form.

Clearance Angle Calculator
Earth Station Centerline Height (h)
Earth Station Elevation Angle (EL)
Height of Obstruction (H)
Distance to Obstruction (D)
Obstruct.gif (1725 bytes)
Clearance Angle (d)
or
Clearance Height (C)
Enter all but one field of the top four and either one of the bottom two then press Calculate.

Bandwidth Calculator

To use this Web page interactively, you must have Microsoft® Internet Explorer 4.01 or later and the Microsoft Office Web Components.  See the Microsoft Office Web site for more information.
 

 

Carrier to noise vs Eb/No

C+N/N (measured on a spectrum analyzer)

dB
C/N

dB
Symbolrate

MBaud
FEC

 
Datarate

Mbit/s
Eb/No (datarate)

dB
Eb/No (before FEC)

dB
Eb/No (brutto bitrate)

Brutto Bitrate = 2 [bit/symbol] *Symbolrate[Msymbols/S]

dB

Set FEC before datarate is set if you want to use datarate instead of symbolrate as input.

Threshold Eb/No as specified in ETS 300 421

FEC Eb/No[dB]

1/2

4.5

2/3

5.0

3/4

5.5

5/6

6.0

7/8

6.4

1

9.0

More calculators on Online Satellite Calculations

Script programmed by Jens T. Saetre 031199

 

 

Calculators designed by John Overstreet, IDB Systems