[Elecraft] HI SIG Testing

[Brett Howard]

I just grabbed a signal generator from work and brought it home...

Turned on the preamp and at about .320mV rms I got a HI SIG warning and
poof the preamp was disabled.  

Then turned the signal up further yet.  I didn't note the point at which
it turned off exactly but it was just over 2Vrms.

This testing puts this mod and the software to be working 100% and both
of the trip points are occurring in the range in which they are
expected.   

This makes me very happy because the first year I took the K3 out to
Field Day I'd owned it for only a few days.  The rig ended up dying at
that FD.  Thankfully it was fixed in a timely manner but the solution
was to replace R66 (I think was the ref des) and Q8.  For good measure
Q9 was replaced as well.  R66 dies as a result of too much current
through Q8 and Q9 (which are in parallel).  I'm quite glad to have this
one in place.  Should provide quite a bit of additional protection.
Although in writing this email I thought it would be good to know the
value of the attenuator.  However I wasn't able to find it... Anyone
know where this is?

~Brett (KC7OTG)