Re: LF: EbNaut and The Cat / Take 3

To:	[email protected]
Subject:	Re: LF: EbNaut and The Cat / Take 3
From:	Andy Talbot <[email protected]>
Date:	Wed, 25 Nov 2015 19:47:11 +0000
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But since that does explicitly include F^2, it is a moot comparison, that isa secondary realationship.

You could use the same argument relating dB to a loop where it scales as diameter ^4 (or area squared)

Then gain =40.LOG(f..)

I think the use of dB = 20.LOG (V or I or [what else]) has caused an awful lot of confusion over the years

I'm of the opinion that dB should always be explicitly 10.LOG and if you want to input V or I or [whatever] then state that that parameter is squared in the equation ie dBW = 10.LOG(I^2 . R)

[what else] - sound intensity or ... ? or ...? What other parameters are squared to give energy or power?

Andy G4JNT

But then, maybe not - consider radiated power from a given antenna height and current

Prad = i^2 * 1579 ohm * (h / lambda)^2

which clearly scales with f^2.

So, in the essence of it's innermost being, "Frequency" remains a mystery ;-)

Best 73,

Markus

-----Ursprüngliche Mitteilung-----
Von: Andy Talbot <[email protected]>
An: rsgb_lf_group <[email protected]>
Verschickt: Mi, 25 Nov 2015 6:32 pm
Betreff: Re: LF: EbNaut and The Cat / Take 3

Moving to 496.4Hz now ?

Frequency expressed in dB has to take the 10.LOG form, not 20.LOG

Consider P = kTB

'jnt

Thanks also from here to all participants (feline and human)! Next step - reduce frequency by 24.4334 dB?

All the best,

Markus (DF6NM)

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