bilou wrote:

wrote in message
...
bilou wrote:

wrote in message
...
Wayne wrote:
Those ranges of impedances are basically worthless.
I don't agree :-)
If I had to test such a tuner the first thing I would do
is put a pure resistor of those values and try to
match them accross the frequency and power range announced.
Measuring the insertion loss would be nice too.
Of course it is not the complete story but a good start.

Which basically tells you nothing about the ability to match a complex
load.
Hello
You are absolutely right in fact a perfect ferrite transformer would be
better.

It is rather difficult for a ferrite transformer to convert a random
complex impedance to approximately 50 Ohm resistive, which is what
an autotuner does.

But an aerial must have a real impedance part to be of any use :-)

Which is why one uses an autotuner to convert the random complex impedance
to approximately 50 Ohm resistive.

Specifications must be easy to verify.

And life must be fair...

Here it is the case.
How do you check the 0.1dB noise figure advocated by many LNB's ?

With test equipment.


--
Jim Pennino