Hi The same “official specs” document that was mentioned about a week back has data on the input impedance. The radio most certainly does not present 125 ohms at all frequencies.
Bob > On Oct 9, 2024, at 5:10 PM, Jacques Fortin <jacque...@videotron.ca> wrote: > > 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 ______________________________________________________________ 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
