[Elecraft] K3 IF NB Question

[John]

On P.24 of the manual, tap NB,  HOLD LEVEL, adj VFO A to turn DSP on 
and adjust the level, works fine. IF NB shows N/A no matter how much 
I adjust VFO B knob. What am I missing? When you turn the NB on 
(TAP), how do you know what kind of blanking is taking place, DSP or 
IF? Running the latest firmware, 1.75 & 1.57. I know, RTFM...I think I have.

John
k7up
K2's 2012, 2223
K1 637
Things are more like they are now then they've ever been before.