Re: New K3 built - can I reset the 5w calibration?

Posted by Alan Bloom on Dec 08, 2011; 11:09pm
URL: http://elecraft.85.s1.nabble.com/New-K3-built-can-I-reset-the-5w-calibration-tp7076112p7076280.html

A 100 MHz oscilloscope is an accurate way to measure RF power on the HF
bands.  Just connect it in parallel with the dummy load and use W3FPR's
formula:

P = E^2 / 400

Where P is the power in watts and E is the peak-to-peak voltage read on
the oscilloscope.

Alan N1AL


On Thu, 2011-12-08 at 16:47 -0600, Nate Bargmann 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 >>
>

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