The linearity of an RF or microwave receiver is typically measured at its intermediate frequency. Nonlinearities at high signal levels due to mixer compression, and at low levels due to noise, are then specified as maximum error figures. However, finding accurate, affordable instruments for direct microwave power measurements could be a problem.
This application note shows how linearity can be measured over a frequency range of 100kHz to 40GHz using a precision power meter and a few power standards. Specifically, it covers use of the TEGAM Model 1806 Dual Type IV Power Meter and Models 1110, 1111, 1118 and 1120 Temperature Controlled Power Standards.
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