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Al's picture

I'll look into both problems, I'm aware of the freezing issues but have had no luck so far with it.

OBW is an acronym for 'Occupied Bandwidth', it's a measure of the frequency range that contains 99% of the total power.
Select part of the spectrum by dragging the middle mouse button and tick OBW, you may have to alter the range to get a sensible result.

I like your approach to the noise source, especially the reverse biased base-emitter - my junk boxes are always my first port of call when building anything.