Finishing off the RF I/O stage means winding 3 toroids and two transformers on relatively smallish cores (T37, T25 and a BN-2402).
(Those are T30 cores in the picture…accidentally grabbed those instead of the T37 cores)
Took me about an hour to wind all the cores and get them soldered onto the board. For the transformers, I think I spent more time checking and rechecking the leads to make sure I had the primaries and secondaries sorted out properly.
Four bifilar turns is a lot to stuff into a BN-2402 core. It was a pretty tight fit with the AWG30 wire but I was able to cram it in.
With the toroids and transformers soldered onto the board (yay for heat stripable magnet wire!), this is what the top of that section looks like now.
Mixer stage is next.