| The
0.1" notch is for the protruding key at the front of the rotary switch.
This keeps the rotary switch from turning when the knob is turned, even
if the front panel nut is not tight. |
| A
notch MUST be filed into the mounting hole or the stepped attenuator could
become warped when the hex nut is tightened on the front panel. |
Alternatives:
1)
You can skip filing a notch into your front panel IF it is thin enough
for you to mount the attenuator with two hex nuts - one on the front and
one on the inside of your panel. |
| 2)
The protruding key on the switch itself could be filed off. (But it is
better to mount the attenuator with two hex nuts). |
|
-Recommended
panel mounting hole pattern:
