OK, my goal has been to document the performance as I received it secondhand from the gentleman who bought it and said he never transmitted with it. ? So I think now I have a good list of where filters need a little tweaking.?
With my limited available time I think next I’m going to pull the main board off, add zeners on the gates, and switch out the insulators for aluminum nitride if I can find my extras! ?
i’ve looked a little bit into the seven pole filters and it looks like I could tweak with some added capacitance at especially beginning and end, and possibly bring 20 m and 15 m closer, ?or into compliance. ?If I lose power at ?18MHZ or 28 MHZ I’ll have to make some trade-offs. ?It is possible I could connect a BNC (after disconnecting the output transformer) to the input of the filter section and map the filters as they are. ?It’s always possible that there has been some damage that I don’t know about, rendering the filters not as effective as others ? ? It was very clear with the filter added to the output that this can be cleaned up to just beautiful!!
I have limited limited time because I’m teaching high school students but I’m going to try to get a little bit done. ?
73
gordon Kx4z?
