[Elecraft] K4 Notch AM doesn't work?

[Tim Tucker]

I just got the K4D up and running.  This morning I tuned to the local AM
broadcast station I listen to, which often has an annoying tone right on
frequency (The K3S heard it, too).  With the K3, I would just manually
notch it out.  With the K4, I turn on manual notch, spin the notch
frequency dial, but nothing happens.  From memory, the interfering tone is
around 2Hz, but I can't seem to make it work on AM.  Is this a feature that
isn't quite working on AM as expected yet?

Thanks,
Tim

-- 
Owner, worldwidedx.com
AE6LX, Amateur Radio