[Elecraft] Problem ... K2 Noise blanker is giving pulses

[Robin Kiszka-Kanowitz]

Hi -

Another day another challenge.

I have recently installed the 160m module and the 20 W ATU in my K2.
Now I discover the Noise Blanker gives  very strong pulse when I click Display and go into the DSP settings ... like on 14 Mhz is it most strong when I display "S1 nr nt". 
Pulses are at approximately 1 second interval and maybe one-fifth second in duration ... NB is supposed to remove the pulses not add them !!!
On std. rcv. there is no pulse noise.

Before I installed the 160m module and AT it all worked fine.
I know its the NB because if I remove the module the problem disappears ...

Anyone got any ideas ..

thanks
Robin
OZ6ABM