RF Coils

[pwdrive]

Thanks Al, that's how I see it too, my interest lies in the circuit between the anode of an RF amp to the grid of the mixer, I did some experiments years ago on real and imaginary impedences and the humble long wire, using my old but sadlly long gone Marconi TF144 sig. gen. all done on the kitchen table, our kids at that time thought I was nuts...Interesting though, we tend to take the simple tuned circuit for granted sometimes.
On the subject of the aerial trimmer in receivers my Hallicrafters SX 28 has one and does work to some effect even on 10 meters.....

Lawrence.