A practical example is given to further illustrate reciprocal mixing and emphasize the importance of low spurious and low phase noise performance. Here a desired signal resides at 915MHz carrier frequency and the unwanted blocker is at 910MHz. The desired IF is 240MHz so the LO is set at 675MHz. LO spurs or phase noise at 670MHz will mix with the unwanted blocker and down convert to the same 240MHz fixed IF, potentially swamping the desired signal and elevating the noise floor.