On Mar 21, 2005, at 5:06 PM, David Kirkby wrote:
> Gary Smith wrote:
>
>>
>> The readings of power out on bird wattmeter have been as accurate as
>> can be obtained.
>
>
> That is simply not true, and I doubt Bird would claim that either.
How are Bird wattmeters calibrated at the factory?
- I used to work in a calibration lab and we calibrated RF wattmeters
by measuring peak-V across a 50.0-ohm termination with a NBS-traceable
oscilloscope and doing the math.
>
> Whether there is a more accurate "field" type instrument I do not
> know,
> but there are more accurate lab instruments around, but these are not
> convenient to use for the sort of thing a Bird gets used for.
>
> I have nothing against the Birds. They do a good job, but they are not
> as accurate as what Bird claim.
>
> --
> Dr. David Kirkby,
> G8WRB
>
> Please check out http://www.g8wrb.org/
> of if you live in Essex http://www.southminster-branch-line.org.uk/
>
>
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|