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

[Don Wilhelm]

Mike. but 5% of full scale for a 100 watt slug is 5 watts.  That is 
exactly the point being made.  The error is a percentage of the Full 
scale reading, and not a percentage of the actual reading.

A 250 watt slug can have an error of 37.5 watts - whether the power 
reading is at 10  watts or 50 watts
  al that can be concluded it that there is some power output - the 
number displayed by the meter cannot be relied on if the power is 
significantly lower than the power ratting of the slug .

73,
Don W3FPR

On 12/9/2011 7:11 PM, Mike wrote:
> 5% of 50 watts is not 5 watts.
>
> 73, Mike
>
> On 12/9/2011 10:32 AM, Eugene Balinski wrote:
>>>  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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