[Elecraft] Inoperable KNB2

[Tom Skinner]

Hello Group,

Well, you can add me to the list of folks who think their noise blanker is
not working.

Now I don't have a lot of noise problems, but do hear the occasional light
dimmer or neighborhood power tool.

I have tried the scratch test, but results were inconclusive.

Today I brought home a 75,000 volt Tesla coil and lit it off across the
room.  As expected, the noise level jumped from S1 to a bit over S9.

The noise blanker has absolutely no noticeable effect in any position.

I have re-inspected the placement of every component and confirmed every
solder joint.  The preps on the RF board were done correctly.

I checked the two diodes and they appear to be neither open nor shorted.

The Tesla coil is probably overkill, but if the noise blanker is working
shouldn't it have SOME effect?

I really don't know what to check next - any suggestions?

TIA es 72/73,

Tom, KJ3D
K2 # 4991