We also added a preselector to the BB60D. It is a sub-octave preselector designed to greatly reduce any second-order nonlinearities (IP2) above 130 MHz by rejecting out-of-band energy.
Below 130 MHz, we have a direct conversion band to 30 MHz, and above that a band that uses a push-pull amplifier to improve IP2 (but to a lesser extent than the preselector).
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