I see that the CMX868 data sheet / data bulletin has a paragraph that discusses the need for an additional 7dB of “trans-hybrid” loss. What is this talking about, and why do I need it?
A. The trans-hybrid loss refers to attenuation of the Tx output signal that gets fed back into the Rx input path of the same device. If the 7dB trans-hybrid loss is not provided then the sensitivity in originate mode will be reduced from the minimum “must detect” value of -43dB. This reduction in sensitivity is due to 2400Hz carrier rejection in the receiver path being around 36dB. While the addition of 7dB of trans-hybrid loss will result in optimum performance, neglecting the additional 7dB of trans-hybrid loss will not prevent operation and may be acceptable in some applications.
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