Ross Archer wrote:

"starman" wrote in message

After reading your original post again, I see that you were using
'stress' to mean any signal level that causes the front-end of the
receiver to operate outside it's design limits, particularly with regard
to linearity.
I too am skeptical of the value of impedance matching or antenna tuning
if the receiver is already getting the signal levels it needs to operate
above the local noise floor. However one of the benefits of impedance
matching for certain antenna types like the inverted-L is you can also
achieve an effective RF ground for the coax shield when the matching
transformer (unun or balun) is located close to the ground. This allows
for a short (effective) ground connection from the common end of the
transformer windings to ground.

And in my experiments, it's a major advantage in reducing local noise
pickup, when the coax shield is connected to a ground rod and into the
ground.

Just keep in mind that many impedance-matching tuners do not isolate RF
input and RF output from each other. They might not serve as well as a
transformer would in for noise pickup reduction?

Does Palomar's so called 'Magnetic Longwire Balun' isolate the RF input
and output? It may be an auto-transformer design with a low impedance
tapped secondary.


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