A few days late, but I'll throw this one out: How about an inline
tuning aid for adjusting manual tuners or tube amps? Most of us
aren't able to dig into the amp to hook up an oscillator, or whatever.
A unit to go in the feedline and act like a TW-1 with tones for
getting a low SWR, or for tuning an amp for high power would be nice.
73, Steve KW3A