Subject: Re: RF power measurement (again)
Date: Tue, 19 Nov 2002 06:30:08 -0800
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Paul Burridge wrote:
> On 18 Nov 2002 16:44:29 -0800, firstname.lastname@example.org (Tom Bruhns) opined
> >o Do you know that the scope is good for the frequency you're
> The signal under test is 40Mhz., the scope is rated at 20., so I
> accept the test set up isn't perfect. However, I was under the
> impression that the general level of signal envelope would still be
> pretty accurately displayed at double the frequency?
My car goes 80 MPH, but I'm pretty sure I can win a race against 160 MPH
You've got it backwards, if you want to measure 40 MHz, get yourself an
> >o Does the resistor get warm?
> Not very. Most of the heat as such appears to come from the tuning
> >Can you compare with
> > a similar resistor excited with DC?
> Can you "excite" anything with DC? :-)
> >o Do you know that the transmitter is designed to output
> > power to a 50 ohm load?
> No it's just my best guess.
> >o Are you sure the resistor looks reasonably like 50
> > ohms at your operating frequency?
> I assume so. It's not wire-wound.
> "I was going to help him up, but then I thumped him."
> Michael Head's plea in mitigation to Weybridge Magistrates, Sept. 1975
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