[Elecraft] New K3 built - can I reset the 5w calibration?

[Eugene Balinski]

>From what I understand, the meter is rated at 5% of the
**full scale** rating according to Bird.  Full scale
rating, is the rating on the slug.  

That would mean that for a meter with a 100W slug, your
accuracy is +/- 5W (5%).   So, if your wattmeter is reading
50W, the actual RF power could actually be 45 or 55 W....

73
K1NR


On Fri, 09 Dec 2011 09:08:55 -0500
 Mike <nf4l at nf4l.com> wrote:
> Wait.
> 
> Using a 100W slug, if you get a reading of 100 watts, the
> real power would be between 
> 95 and 105 watts, right?
> If you get a reading of 50 watts the real power would
> fall in a range of less than 45 
> to 55 watts?
> 
> Not if the 5% at full scale is the best accuracy.  Or did
> I misunderstand what you said?
> 
> 73, Mike NF4L
> 
> 
> On 12/8/2011 11:59 PM, Eugene Balinski wrote:
> > The accuracy of Bird elements is typically  +/- 5% of
> the
> > full scale value.  For a 100 W Slug, that is +/- 5
> Watts.
> >    So theoretically speaking, with 5W in, and 0
> registered
> > on the meter, the meter is still within its rated
> accuracy.
> >
> >
> > Additionally on the model 43 meter, there is meter
> scale
> > end compression.  To get the most accurate reading, one
> > would want to have the 5W reading at the middle of the
> > meter range, which means that one would want a 10W
> slug.
> >   Unfortunately I do not believe that Bird makes a 10W
>  HF
> > slug any more.  Perhaps they need an Elecraft W2 ??
> >
> > 73
> > K1NR
> >
> >
> > On Thu, 8 Dec 2011 16:47:27 -0600
> >   Nate Bargmann<n0nb at n0nb.us>  wrote:
> >> > From my experience, trying to measure 5W with a 100W
> >> element leads to
> >> very inaccurate readings.  The Bird is most accurate
> when
> >> the reading is
> >> as near to full scale as possible.  That means a 5W HF
> >> element (is that
> >> even available?) would be ideal provided no more than
> 5W
> >> is put through
> >> the meter.  A 10W element would be less accurate but
> >> provide a safety
> >> margin for the meter.  Even better would be to have
> both
> >> elements and
> >> use the 10W one to get in the ballpark and the 5W one
> for
> >> a final check.
> >>
> >> 73, de Nate N0NB>>
> >>
> >> -- 
> >>
> >> "The optimist proclaims that we live in the best of
> all
> >> possible worlds.  The pessimist fears this is true."
> >>
> >> Ham radio, Linux, bikes, and more: http://www.n0nb.us
> >>
> 
> 
>
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