Add new comment

Al's picture

Thanks,
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.