[R-390] Official specs

[Jacques Fortin]

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