[Moon-net] Réf. : Re: additional cable loss in front of LNA

[DEHAYS Dominique]

Hello ,


I have always found those curves extremely misleading , and
they crept into many persons brain ( hams and non hams) the idea that
cable losses increase with SWR , which is absolutely wrong.


These " additionnal line losses" have simply nothing to do
with transmission lines , you can exactly find the same results with no
lines at all ( generator directly connected to the load.

It simply means that the generator cannot transfer maximum power to the
load because impedance is not matched.

It is not really a loss , but simply says that power transfer could
be x.xx dB better if the impedances were matched. So , as it is not
power loss , this has absolutely no influence on noise figure.


73

Dom/F6DRO