Jerry,
For some that is a mountain. Others maybe an afternoon.
I tried to balance it with very few new parts, no involved
measurements, maximum HF functionality with
improved filtering.
For the "but 10M" I offer with straight though using the mentioned filter
will solve the 10M issues both harmonics and spurs.?
That filter type would likely work for 12M and 15M with the
appropriate frequency filter.
Allison