"Jan Panteltje" wrote in message
...
On a sunny day (24 Sep 2006 10:03:00 -0700) it happened "Telstar
Electronics"
wrote in
. com:

Jan Panteltje wrote:
At 27MHz 50Ohm this is not critical.

Huh???? Since when is impedance matching at RF frequencies not
important? Then maybe you could tell us at what frequency it is
important... LOL

You really have no experience now have you?
First the little PCBs just form some extra capacitance to ground.
There is no transmission line.
And you may need that anyways, why else solder those caps over your
output transformer.
Second, for a transmission line L and C are important, and L is close
to zero here, and f is very low.
The 'length' of the track is very very short in their design.
You can hardly speak of a transmission line at all at 27MHz.
Not a significant part of the wavelength anyways.
'Transmission line' properly matched only implies no refections
and some known impedance after all.
And where is this 'line'?

You mentioned that calculator, but did you ever use it?
If so what did you enter for the constants?

Obviously you kneel before the SWR gods. You dont have to have a transmision
line to have a matching problem. Matching means to have the output impedance
of a driving stage equal to the input impedance of a driven stage so maximum
power is transfered with minimum distortion. Nothing was said of
transmission lines or SWR.