[R-390] please help

[Jacques Fortin]

I disagree...
-141dBm is .02µV in 50 ohms.
If another receiver input impedance is specified, the related voltage will
change accordingly.
I hope that all agrees that 0dBm equals 1 mW.
I also doubt that a R-390 (A) input impedance gives 50 ohms at all
frequencies, all the time...
This is why some states a receiver sensitivity as being a  number of EMF
volts from a specified source Impedance (like 1µV EMF in series with 50 ohms
for 10dB of S+N/N), because this puts the receiver input impedance
variations out of the picture.

73, 
Jacques, VE2JFE

-----Message d'origine-----
De : R-390 [mailto:r-390-bounces at mailman.qth.net] De la part de Bill Riches
Envoyé : 8 octobre 2016 12:22
À : wb3fau55 at neo.rr.com; R-390 at mailman.qth.net
Objet : Re: [R-390] please help

-141 dBm = .2 uv

73,

Bill, WA2DVU
Cape May

OK guys,  some years  back I read someone quote a noise floor of -141 DB for
a "golden" R-390A. Please, if someone would,  convert that to microvolts.  I
think it was in ER magazine 

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