On Nov 18, 2:45*pm, Jim wrote:
On 11/18/2010 8:39 AM, Richard Clark wrote:





On Tue, 16 Nov 2010 12:47:02 -0800, *wrote:

Here is some more info for you guys to chew on...

http://www.midnightscience.com/downl...es/anatomy.pdf

OK Jim,

I gave it a look.

I have to wonder from the start, and in the context of Xtal sets that
are usually employed for BCB, where the author decided that a typical
antenna exhibited 50 Ohms resistance and 40pF capacitance.

That was the first of a number of similarly random values assigned to
components that has me drawing up cold. *From that, I have to wonder
what the value is in the practice of transforming those values.

73's
Richard Clark, KB7QHC

I think that you need to ask the author. I just wanted to add some other
opinions.

I would say that he used some ideal values as a place to start with.
Kind of a 'what if.'

* * -Jim- Hide quoted text -

- Show quoted text -

When I was a kid I used to build crystal receivers that had a sliding
tap on the coil titerally wound on a toilet paper tube and adjusting
a variable cap. every station you received had a "best " posotion for
the cap and tap and this also seemed to change from day to day or even
minute to minute. This was my first lesson in the interaction between
impedance and resonance.

Jimmie