[R-390] sensitivity

[Alan Victor]

Here is the appropriate equation:

Sensitivity (dBm) = -174 dBm + NF (dB) + 10 log (BW) + required S/N ratio
for detection.

So example, the NF of the total receiver is 10 dB and the BW is 1 kHz and
desired S/N is 10 dB.

-174 +10 +30 dB +10 results in  -124 dBm. Knowing -107 dBm is 1 uV, you can
find the equivalent value.

On Thu, Oct 6, 2016 at 3:16 PM, Bob Camp <kb8tq at n1k.org> wrote:

> Hi
>
> You *always* have to check the bandwidth being used for the sensitivity
> claim. The numbers for something like
> a 10 Hz bandwidth (easy to do with DSP) will always be very different than
> the numbers for 100 Hz or 500 Hz.
>
> Bob
>
> > On Oct 6, 2016, at 5:49 PM, wb3fau55 at neo.rr.com wrote:
> >
> > Folks,  recently I saw  an ad for a piece of gear  saying it  had a
> sensitivity of .07uV.  I might believe .1uV.  Is noise a real issue down at
> that level?  thanks for your realistic input-hi.  Russ.
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