On 5/26/22 8:18 AM, Bob kb8tq via time-nuts wrote:
Hi
The real answer to the problem is to dig into the bowels of 1940’s electronic
craft.
There are various methods for setting up an L/C filter. You short this / open
that sweep
to find a dip or a peak. You move it to the “right” place. Just what you do
depends
very much on the filter design. Many L/C’s got done this way or that way simply
because they would fit a known alignment method.
While it all sounds very cumbersome and obscure it actually isn’t. Long ago I
stumbled
upon a gal setting up very complex L/C IF filters this way. The display gyrated
this way
and that way as she did this or that. I don’t think it took her more than a
minute to get
the whole thing set up….. to this day, I’m amazed by how fast she was.
Do I have any useful links to actually read up on this magic? … sorry about
that.
Bob
There are actually computer driven screwdrivers to do tuning on cavity
filters. The operator puts the screwdriver to each cavity in turn. The
filter is hooked up to a VNA with a computer that runs the scripts..
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