Portsdown Noise Meter

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The Portsdown Noise Level Meter uses a LimeSDR to measure and indicate noise or carrier power levels. It has 3 modes:

  • Absolute Noise Measurement
  • Differential Noise Measurement
  • Carrier Level Measurement

Absolute noise measurement is used to measure Sun or Moon noise. The system can be "zeroed" against cold sky, and then the meter will indicate the increase in noise averaged over a wide bandwidth. Differential noise measurement can be used to measure the strength of DATV transmissions or possibly to optimise aerial/receiver matching. The noise power in a reference (quiet) frequency range is measured and compared with the noise power in a frequency range that contains a DATV signal. The Carrier Level measurement compares the peak level of a carrier within a deifned frequency range with the average noise level in a quiet frequency range.

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