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Re: [Amps] Bird Element Calibration?

To: "R. Measures" <r@somis.org>,"David Kirkby" <david.kirkby@onetel.net>
Subject: Re: [Amps] Bird Element Calibration?
From: "Gary Smith" <wa6fgi@sbcglobal.net>
Reply-to: Gary Smith <wa6fgi@sbcglobal.net>
Date: Tue, 22 Mar 2005 10:40:30 -0800
List-post: <mailto:amps@contesting.com>
I did ere on that statement. Offering free mea culpa's and anjeo tequila to 
those who wish to stop by.
73,
Gary... wa6fgi

  ----- Original Message ----- 
  From: R. Measures 
  To: David Kirkby 
  Cc: amps@contesting.com ; Gary Smith 
  Sent: Tuesday, March 22, 2005 7:35 AM
  Subject: Re: [Amps] Bird Element Calibration?



  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/
  >
  >
  >
  > _______________________________________________
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  > Amps@contesting.com
  > http://lists.contesting.com/mailman/listinfo/amps
  >
  >

  Richard L. Measures, AG6K, 805.386.3734.  www.somis.org

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