Return-Path: X-Spam-DCC: paranoid 1102; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, HTML_40_50,HTML_MESSAGE autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id tAPJss0g023444 for ; Wed, 25 Nov 2015 20:54:54 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a1g3P-0001kq-F2 for rs_out_1@blacksheep.org; Wed, 25 Nov 2015 19:48:35 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a1g3P-0001kh-3z for rsgb_lf_group@blacksheep.org; Wed, 25 Nov 2015 19:48:35 +0000 Received: from mail-wm0-f45.google.com ([74.125.82.45]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.86) (envelope-from ) id 1a1g2F-00059F-K6 for rsgb_lf_group@blacksheep.org; Wed, 25 Nov 2015 19:48:34 +0000 Received: by wmww144 with SMTP id w144so83233717wmw.0 for ; Wed, 25 Nov 2015 11:47:11 -0800 (PST) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=8C/cFsRuop0MyLM9MRzBkQ/xzVr3l1jtuwo7VMeFBZ8=; b=e63iQMMvvnpgwzdMctGHl45AwgMf3v6DCrbsyzOxCuTLhqBigdrRt7Sl9QCTBMkOLn LwfkJ7UbtFIHx+YjRUo6y3TRnV27nWQ5tyQEqxro87VIA4UWcs0EdMb1KDxA+KVeqBDM SCxKsTjI5E21DqVKwT3ee+WonXziGKhUs/yS19zi9UPmh8eJe9aIWNwHvmOvZMiD37By LczqAlQfZOAYegJPq9U/KysoVQMUZYkPQLgKA9+i7Np3AWByvEm96HdxAxTljHNZeGEY wMRhmzunEiTPOROpVBT0RQcsx4hk1CzSGeWSVEq4ukN8bi1LOfh5ed8c9uhHVm0ooDgX DKmA== MIME-Version: 1.0 X-Received: by 10.28.225.84 with SMTP id y81mr6859172wmg.87.1448480831285; Wed, 25 Nov 2015 11:47:11 -0800 (PST) Received: by 10.28.130.139 with HTTP; Wed, 25 Nov 2015 11:47:11 -0800 (PST) In-Reply-To: <8D2F5CEE86A9058-14FC-16B19E@webmail-vm002.sysops.aol.com> References: <8D2F5CEE86A9058-14FC-16B19E@webmail-vm002.sysops.aol.com> Date: Wed, 25 Nov 2015 19:47:11 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org X-Scan-Signature: 3547ef0bd9aa4f6a2596c8a6b1b20265 Subject: Re: LF: EbNaut and The Cat / Take 3 Content-Type: multipart/alternative; boundary=001a114b144069b649052562b966 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 5315 --001a114b144069b649052562b966 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable 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 =3D40.LOG(f..) I think the use of dB =3D 20.LOG (V or I or [what else]) has caused an awfu= l 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 =3D 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 =3D 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 > > > -----Urspr=C3=BCngliche Mitteilung----- > Von: Andy Talbot > An: rsgb_lf_group > 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 =3D 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) > > > > --001a114b144069b649052562b966 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
But since that does explicitly include F^2, it is a moot c= omparison, that isa secondary realationship. =C2=A0
You could use the s= ame argument relating dB to a loop where it scales as diameter ^4 =C2=A0(or= area squared)=C2=A0
Then gain =3D40.LOG(f..)

I = think the use of dB =3D 20.LOG (V or I or [what else]) has caused an awful = lot of confusion over the years

I'm of the opi= nion that dB should always be explicitly 10.LOG =C2=A0and if you want to in= put V or I or [whatever] then state that that parameter is squared in the e= quation =C2=A0 ie =C2=A0 dBW =3D 10.LOG(I^2 . R)

[= what else] =C2=A0 - sound intensity or =C2=A0... ? or ...? =C2=A0 What othe= r parameters are squared to give energy or power?

= Andy =C2=A0G4JNT



But then, maybe not - consider radiated power from a given antenna he= ight and current
=C2=A0Prad =3D i^2 * 1579 ohm * (h / lambda)^2
which clearly scales with f^2.
=C2=A0
So, in the essence of it's innermost being, "Frequency" = remains a=C2=A0mystery ;-)
Best 73,
Markus

=C2=A0
-----Urspr=C3=BCngliche Mitteilung-----
Von: Andy Talbot <andy.g4jnt@gmail.com>
An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
Verschickt: Mi, 25 Nov 2015 6:32 pm
Betreff: Re: LF: EbNaut and The Cat / Take 3

=20
=20
Moving to 496.4Hz now ?

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

Consider P =3D kTB =C2=A0

'jnt



=20
=20
Thanks=C2=A0also from here to all participants (felin= e and human)! Next step=C2=A0- reduce frequency by 24.4334 dB?
=20
=C2=A0
All the best,
=20
Markus (DF6NM)
=20

=C2=A0
=20


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