Hi
I used to have an HW-7 a few years ago and remember that I had to tune from the top of the band downwards to correctly tune to the incoming signal. Otherwise, going the other way, you will be offset by too much, as due to the direct-conversion nature of the receiver, any incoming signal will produce a beat note above and below the carrier....it's the one above that the other op will be tuned to.
Hope that make sense

)
Best 73, John G4GOY