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)

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[Bob Cunnings NW8L]

-10 dB according to the K3 RF board schematic, page 4 of 4.

Bob NW8L

On Sun, Aug 16, 2009 at 5:30 PM, Brett Howard<[hidden email]> wrote:


> 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)
>
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[Brett Howard]

Makes sense...

Just found that on the FAQ page too...

Thanks much.  Feels good knowing that there is at minimum an extra 10dB
of protection there!

Gotta love it!

~Brett(KC7OTG)

On Sun, 2009-08-16 at 17:51 -0600, Bob Cunnings wrote:

> -10 dB according to the K3 RF board schematic, page 4 of 4.
>
> Bob NW8L
>
> On Sun, Aug 16, 2009 at 5:30 PM, Brett Howard<[hidden email]> wrote:
>
>
> > 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)
> >
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

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