http://elecraft.85.s1.nabble.com/New-K3-built-can-I-reset-the-5w-calibration-tp7076112p7080408.html
watts - if the wattmeter has been recently calibrtrated. So a reading
environment and are quite dependent on the precision of the dummy load.
> 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<
[hidden email]> 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<
[hidden email]> 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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