"beryl george" wrote in message
...
Looking at different manufactures units they are quoting their
receivers sensitivity as

.35uV at 12dB SINAD
1uV at 20dB SINAD
-5dBu for 20dB SINAD

Let's convert the uV's to dBuV's first (= referencing all values in dB
compared to 1uV).
0.35uV is -9dBuV
1uV is 0dBuV
-5dbuV is, well, -5dBuV

Now let's add 8 dB on both sides to get the same S/N ratio on the first
line. This results in:
-1dBuV at 20dB SINAD
0dBuV at 20dB SINAD
-5dBuV at 20dB SINAD

It is now clear that the last receiver requires the least signal to reach
20dB signal to noise ratio.

Meindert