[Elecraft] OT: Bird watt meter?

Wed Jul 2 20:43:01 2003

I have calibrated my Bird 43 HF slugs with the HP 436A power meter which is
accurate to within +/- 0.5% of the indicated reading. With the 50 watt slug,
the Bird reading never differs from the 436A indication by more than a
needle width on 40 and 20 meters.

Close enough for me . . .

73/72, George
Amateur Radio W5YR -  the Yellow Rose of Texas
Fairview, TX 30 mi NE of Dallas in Collin county EM13QE
"In the 57th year and it just keeps getting better!"
<mailto:[email protected]>

----- Original Message -----
From: "Roy" <[email protected]>
To: "Stuart Rohre" <[email protected]>; <[email protected]>;
<[email protected]>; <[email protected]>
Sent: Wednesday, July 02, 2003 6:39 PM
Subject: Re: [Elecraft] OT: Bird watt meter?

>
> ----- Original Message -----
> From: "Stuart Rohre" <[email protected]>
> To: <[email protected]>; <[email protected]>; <[email protected]>
> Sent: Wednesday, July 02, 2003 1:55 PM
> Subject: Re: [Elecraft] OT: Bird watt meter?
>
>
> > Bird meters are only good to plus or minus 5 per cent, presumably of
full
> > scale.
> > -Stuart
> > K5KVH
> >
> >
> If you are lucky. I calibrate Birds at a nist lab. All are limited to +/-
> !0% of full scale or more. They are very nonlinear on frequency. I
> personally have never understood the reverence for Bird meters. The only
> pluses I can give them is no power required for operation and you can drop
> them from a tower and they will survive. I would never rely on them for
> anything but peaking a signal or a VERY general  output indication.
>
> Roy AB7CE
>
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