[AdrianH]

Another question on the AT5,

Looking at the circuit at the coil and cap on the output of the second EF80, described as doubler for the the 3.5 MHz band.

I have always thought of a coil and capacitor in series as a rejector circuit, in that it would appear as low impedance at it's resonant frequency, in which case if it was tuned at 3.5 MHz it would shunt output to ground, not double it, so wondering if the coil and cap is broadly tuned for 1.9 MHz, or have I got it wrong again?

Adrian