On Mar 26, 2005, at 12:13 AM, G3rzp@aol.com wrote:
> I don't think there's a lot of disagreement between G8WRB and myself.
> We
> seem both to be very dubious about the accuracy of using an
> oscilloscope, and
> recognise the problems with calorimeters. Incidentally, at Marconi's
> the power
> was measured with a water cooled resistor: it was about a 50 watt
> resistor in
> air, and if you got a bubble in the water, at 30kW, it died 'just like
> that!'. I suspect you really need a constant head apparatus, which at
> gallons per
> minute is possibly but not necessarily wasteful, and messy.
>
> And for amateur purposes, for 99% of the time a Bird 43 is good enough
> anyway!
The other 1% of the time is when the FCC comes a knockin' and they
bring their own digital PEP wattmeter. In actual practice, I know of
two cases where the FCC measured well over 1500w-pep and did not cite
the amateur because they found that the station was not a source of
RFI.
- One of the curiosities of this discussion is that no Bird 43
disciple seems to have knowledge of the calibration procedure with
which Bird calibrates wattmeters at the factory.
>
> 73
>
> Peter G3RZP
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>
>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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