PeteS said:

I would suggest looking up basic transmission line theory. A 'perfect'

antenna is in fact a limiting point for transmission lines (either open

circuit or short circuit at DC) and the length of the antenna counts -

but the reason for that is in basic transmission line theory.

A properly matched antenna 'looks' like a resistive (close, anyway)

load to the RF PA, and does itself perform an impedance match (from the

antenna Zo to free space Zo - about 377 ohms).

Tuning, as noted, depends on a number of factors (importantly, the

amplifier class of the PA stage, but there are other issues), so it's

hard to know how to respond to that.

Hope that gets the thought noodles going

Cheers

PeteS

This is getting clearer and clearer but somethin new issues comes up

and confuses me as I learn more.

I have studied tansmissionline theory, and yes theory, which is far

beyond my understanding.

But this is clear so far, in order to transfer power losslessly (can it

be said this way) from stage to the next one we need inputs and output

impedances match to 50ohm. But when calculating matchin LC network what

is matched to 50 ohms. Like if we have an oskillator following with amp

and these two element has to be matched together. How do we know

oskillators output imedance which is to be matched to 50 ohm and this

further to be matched with amps input impedance (which is?) If this

oskillators 50 ohm matched output (lets assume we managed to calculate

the network)is connected to transistors base, then I could somehow

understand if the imput impedance is transistors base-emitter

impedance. But so far I could't find this information from any

datasheets.

I have tried also to find ready calculated network examples with real

citcuitry so I can figure out without Q and Z parameters and pages of

calculations. There has to be more practical way of doing this .