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Receiver test data from
S = Sherwood
P = Passport
Q = ARRL QST mag

5 KHZ THIRD ORDER INTERCEPT DYNAMIC RANGE

This is one spec. That's like comparing cars soley on the transmission or
engine size. It tells you next to nothing about the receiver's overall
performance.
And for those of us with rotatable, directional antennas and no MW broadcast
stations in the same county, IP3 is probably the least important spec.
Dale W4OP