[Elecraft] KX3 "Full" SDR

[Bruce Beford]

Dave, I agree with your math, except...

Having a noise level of -27dBm delivered by the transmitter to the antenna
system, does not mean the antenna has 100% radiation efficiency, yes?

So -27dBm is 2 microwatts in transmitted noise to the antenna system, at
this particular spacing, in a 500Hz bandwidth. 

You must make some allowances for not only path loss, but antenna efficiency
on each end, yes?

As I said, I am not trying to defend these performance (or lack thereof)
claims. I just disagreed with the statement that the "Flex is transmitting
wideband S9+45 noise" 

"S9+45dB" is a receive measurement, not a transmitter measurement. The Flex
is sending 2 microwatts to the antenna at the frequency in question.
Admittedly, that's too much, in many situations.

Peace,
Bruce N1RX