[Radio Wrangler]

A epic performance, Martin, but all too typical of the setup shenanigans of sets with bandspread.

Having the bandspread capacitor in the wrong position while trying to get the LO to agree with the main scale (with the correct IF offset of course) makes it an impossible task.

Using alignment frequencies about a quarter span in from each end is a way of compromising so you get as much alignment error swinging positive as you get swinging negative, and you get a better fit of your error curve. However, the dominance of the L setting at the LF point and the dominance of the C trimmer at the upper point are no as pronounced, so it takes more to and fro shuffles to get things as good as they can be.

I'm trying to remember if the 9R59 has double-tuned RF coils and that like IFTs there are two slug settings that give the right L and the right resonant frequency, one withthe two slugs closer together nd one with them further apart, peeping out of the other ends of their coils. The difference being in the coupling they give. With the slugs together you get a broad filter, M shaped rather than a narrow peak.

David