[Elecraft] K3 receiver noise questionable test results

[K2MK]

I've hesitated to write because I don't have another rig to compare to my K3 
and because I use a vertical antenna which is by its nature noisy. I always 
have a high background noise level on all bands. I have NEVER experienced 
what some have described as a dead quiet band with signals popping out.

My K3 is a year old with the latest firmware and all of the hardware mods. I 
have not yet upgraded to a Rev C DSP board. I have tried various settings 
for RF gain and AGC THR and SLP. I believe that I am proficient in making 
these adjustments.

One test that I have performed leaves me scratching my head as to its 
results. Maybe someone can enlighten me. I tune to a medium strength CW 
signal and press my ANT button to switch between ANT 1 and ANT 2. I have 
nothing connected to ANT 2. The signal disappears but the background noise 
level remains the same.

73,
Mike K2MK