In a message dated 19/03/2005 22:27:10 GMT Standard Time,
philc@texascellnet.com writes:
but are useless if you
> actually want to know the power output.
+/-5% works out, according to my calculator as +/- 0.22dB. Prodigious!!!
If we go look at professional standards for 'Type Approving' equipment, we
see that an approved accreditation lab is supposed to measure to +/- 0.75dB at
99.9% certainty. That's nearly 19%.....
So personally, I trust the '5%' claim as much as I do a politician.....
There has been a lot of work done at ETSI, the European Telecommunications
Standards Institute, on measurement uncertainty. The reports are pretty major
things, but you can download them free from _www.etsi.org_
(http://www.etsi.org)
The ones on measurement uncertainty are TR100 028-1 V1.4.1 and TR100 028-2
V1.4.1
They should help you get to sleep.....
73
Peter G3RZP
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