BFO


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BFO
BFOThe BFO is used to produce output tones from an on-off or frequency-keyed signal. It must provide a certain tuning range, which is generally specified. This range must be tested. The product demodulator generally used for introducing the BFO signal has a finite carrier suppression and may have leakage into other stages. For some purposes, such as recording the IF output, BFO leakage could cause unwanted IM distortion. IF and baseband outputs should be tested with a selective microvoltmeter to ensure that at these outputs the BFO level is adequately below the signal levels. A level at least 50 dB below the IF signal level is reasonable in practice, and the baseband attenuation should be at least that much. In a digital IF implementation, all demodulation functions are handled by the DSP, including the BFO and…
Citation
Prof. Dr.-Ing. habil. Dr. h.c. mult. Ulrich L. Rohde; Jerry C. Whitaker; Hans Zahnd: Communications Receivers: Principles and Design, Fourth Edition. BFO, Chapter (McGraw-Hill Professional, 2017), AccessEngineering Export