"Michael Black" wrote in message
news:alpine.LNX.2.02.1406022006130.12068@darkstar. example.org...
On Mon, 2 Jun 2014, gareth wrote:

Interesting, and perhaps something akin to the Z Match ATU, but not
quite what I had in mind which was two ganged tuned circuits top
coupled by a capacitor.

Ah. So how do you expect to get this to be multiband without
bandswitching?

Of course, there has to be bandswitching of the antenna input and
the filtered output, but otherwise, for as many band as you wish
to cover, you have that many tuning condensers (and knobs!)

Apart from LF where you'd likely have a LPF rolling off at 300kHz





As any general coverage shortwave receiver will tell you, you can
generally get 2:1 tuning range,

500pF = 3:1