[Lowfer] reERP calculation

[Neil Klagge]

Hi Alan. Thanks for your feedback. I hope I said average "CURRENT" rather
than average Power....

I guess that whatever type meter you use, the reading needs to be converted
(if necessary) to RMS amperes in order to enter it into my spreadsheet.

Let me know if I said it wrong.
tnx
Neil

w0yse, wg2xsv,now in Vancouver WA
CN85rq

On Sun, Jan 25, 2015 at 1:36 PM, Alan Melia <alan.melia at btinternet.com>
wrote:

> Hi Neil I am not sure about your assertion the rf ammeters read average
> power. Surely the thermocouple variety (yes I have a box of then from the
> 1950s ::-))  ) use heating effect so measures rms directly.
>
> The ferrite transformer type with a low  impedance moving coil meter
> measures mean and needs a 1.11 calibration factor applying . However if a
> high impedance detector, DMM, current probe into 'scope or panel meter, is
> used then this measures peak current which requires multiplication by 0.71.
> I think. Perhaps John could comment as his circuit is recommended :-))
>
> Dave Powis kit (see http://g4hup.com/RFC/RFC.htm) is calibraated and
> chacked against an HP power meter so reads rms.
>
> (just to show I am still lurking in the background )
> Alan
> G3NYK
>
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