[R-390] Official specs

[Bob Camp]

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 <jacques.f at 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
> 
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