"Jan Panteltje" wrote in message
...
On a sunny day (24 Sep 2006 16:47:45 -0700) it happened "Telstar
Electronics"
wrote in
. com:

Jan Panteltje wrote:
So we ask him again: What values did you enter, and what dielectric
constant
for the PCB material and 'tape'.

You are getting to be a real pain in the keyster... LOL

We wil get you to publish the diagram too ...:-)

I use 0.062" 1oz FR4 for my designs.
The dielectric constant of FR4 is about 4.6
Thickness of 1oz copper is about 0.0014"

So with a ground plane on one side of the board... the width of the
trace to maintain a 50 Ohm characteristic impedance is about 0.113"
wide.

OK, now you have a 50 Ohm track, and *where* do you put it?
The only place you could possible use it is to the output connector,
and that connection happens to be a *wire*.

Have a look at those pictures again, the extra PCBs you were _originally_
referring to as needing that website calculator, are just simple
solderpads.
The rest is normal wiring.

P.S. Have no idea what tape you're talking about...

The double sided tape you accused them of using to glue on those extra
boards
that are used as solder pads.

And, I have to say that .113 inch equals around 3mm width.. your
transistor
connections and the stuff they are soldered to on your board are wider..

But you score on one point, you caused 2 more posts on the subject of
'Telstar amp'.

You can score a *lot more* reactions by publishing the diagram, people
will have questions and suggestions and maybe even [positive] critism
if you do.
So let's have it OK?
You are no chicken to show it no? It is free of flaws I am sure?
Come on Brian, it is not THAT different from the appication notes now is
it?



I have to agree that 50 ohm striplines are useless in an amp like this, it
is only important that the output impedance of the driver stages match the
driven stage. I cant see how you could do this with striplines on a
broadband amp at HF. There is already proven interstage design. NEW and
IMPROVED means new and improved over 30 year old technology. Bring CB amps
up to current technology would mean only advancing them about 10 or 15 years
from the 70s . Even in the 70s it was well known how to build a decent amp
but this is not what the CB market wanted then or now. As far as other
markets are concerned it is already very crowded and difficult to get ones
foot in the door.