Sure, everything has its limits and we always create a model of reality that is not completely true, but thanks to your help I finally have a clearer idea of how things should be done. Even if we start with wrong conditions...
In the end the topic is not that important, but I was curious to understand it... For the noise, here in Florence, Italy, it's hell, and even for the measurements I have to choose the right moment. I also had to chase two disturbers inside the house: one was the Wi-Fi extender, one of those that use the home wiring, and the other was an old MacPro 2008 that produces a lot of noise even when it's off (or better, when they tell us that it's off... because it's not off). > Il giorno 9 ott 2024, alle ore 23:10, Jacques Fortin <jacque...@videotron.ca> > ha scritto: > > Hi Gianni, > That's pretty much it, yes. > But does a R-390A input behaves as a 125 ohms resistor at all frequencies ? > I have doubts... > And even if you can measure it's sensitivity as 0.5µV for 10dB of (S+N)/N, > the actual ambient noise conditions will prevent you to receive any signal at > this level. > I do not know how it is going in Italy, but here, the ether was way more > quiet that it is now 30 years ago... > The received noise level at my location is S9 to S9+10dB, 24 hours a day, on > all frequencies from 100k to 30MHz. > Even a good noise blanker cannot get rid of it. > Except when it rains ! It goes down to 2-3 S units. > And I am still searching for the source... > > 73, Jacques, VE2JFE in Montreal > ______________________________________________________________ R-390 mailing list Home: http://mailman.qth.net/mailman/listinfo/r-390 Help: http://mailman.qth.net/mmfaq.htm Post: mailto:R-390@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
