I'm designing a 40-70 MHz synthesizer using the Mini-Circuits POS-75 VCO.
The VCO output varies from 9 dBm at 40 MHz down to 7 dBm at 70 MHz. My
circuit needs to provide isolation, tolerate open and short-circuit loads,
and deliver 15 dBm into 50 ohms across the tuning range. What do folks
think of the solution below? In particular, what about C2? This "hack"
seems to compensate for the input level variation; but I don't know if it
will work for real. This is for very low volume production and C2 could be
set-on-test.