[Central-Electronics] 100V and SWR?

[Eugene Hertz]

Hello all,

I have read that the 100V has a measure of protection in the case of high SWR.  Well, I put my first antenna up this past weekend and I had 3:1 on 80m and infinity on 160m.  Yet, the mismatch indicator never indicated.  So to test if this circuit was working, I disconnected the antenna altogether and sllooowwwllly increased power from 0 to max (momentarily) so that I could see this indicator work (and presumably to hear a relay actuate).  Yet I heard and saw nothing.  Built-in o'scope showed a nice long vertical line as I increased power but no mismatch.

Q's
1. Does anyone have experience as to how much SWR it should take to trigger this thing?
2. Does anyone have a procedure I can use to make sure this protective feature is operational?

Third unrelated question: The manual indicates that the hairline can be adjusted so that the VFO display is right on target, I am guessing similarly to how a collins R-388 or J4 works. Where is this adjustment? 
thanks
Eugene