Carrier level Calculator
Updated 08 December 2002
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The calculator does NOT calculate 100% correct values but should give a good indication of the cxr level of a unknown cxr. There could be more inaccurancy in the measurments than the calculations.
The calculator will not calculate correct if the noise level is higher in low band than in high band. The noise level of the LNB/LNA must be flat constant. LNB's have variable gain and cables have more attenuation on high frequencies compared to low frequencies. On a 11/12GHz spectrumanalyzer used on a antenna with LNA's and waveguide the calculations work quite well.
To
avoid big errors :
Measure a known cxr near the unknown cxr.
Measuere noise level on lower and higher frequencies. Calculate
a dB/MHz value that can be used to correct the cxr level result.
Calculation used:
CXRLEVELUNKNOWN=CXRLEVELKNOWN + (EIRPUNKNOWNEIRPKNOWN) + 10*LOG(SYMBOLRATE KNOWN CXR/ SYMBOLRATE UNKNOWN CXR)
1dB=
30dBm
YdB= XdBm30dB
20©02 Jens T. Satre
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