From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sipsolutions.net (s3.sipsolutions.net [168.119.38.16]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8B80A282E1 for ; Fri, 16 May 2025 08:38:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=168.119.38.16 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747384691; cv=none; b=UxyP5XLWq+6ny/2TxXmXLzDHqWbV1m+NtoPk1XOok1VeY+U39nFKz7HTTWyPhdtQyRGLEkeSQ70U3FYgWDCXFZzUrTTGixxPN9bEedyJTkWJU/aGacVNbBSK9fsb6w8OhzuKNoD2KBPvwqRbNgdZS3dfOH8HV3Ilqn6tBpc/46c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747384691; c=relaxed/simple; bh=3+eO/Qfn6xTvJMuj8st/TlhNA5PDFTSdkuTMA5gffj4=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=DiYmd0xMDQZHU4JUTw9u9ciS/n8aWM5IWEzrln76mJS8EGCRE7/IRH+YfmCsLFKw1xtCsrurZIIWuotmnw/UUNz8ZVI2D0iYj/qDwkpOxvNey7gVQTJ8OK3T1IIqZIBxbqPyAQR6xX0YXZLUxY3l64Jm9wK0Nj90R5AF1xuCLLQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sipsolutions.net; spf=pass smtp.mailfrom=sipsolutions.net; dkim=pass (2048-bit key) header.d=sipsolutions.net header.i=@sipsolutions.net header.b=oe3a1LN6; arc=none smtp.client-ip=168.119.38.16 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sipsolutions.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sipsolutions.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=sipsolutions.net header.i=@sipsolutions.net header.b="oe3a1LN6" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sipsolutions.net; s=mail; h=MIME-Version:Content-Transfer-Encoding: Content-Type:References:In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender :Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-To: Resent-Cc:Resent-Message-ID; bh=3+eO/Qfn6xTvJMuj8st/TlhNA5PDFTSdkuTMA5gffj4=; t=1747384689; x=1748594289; b=oe3a1LN6eRsRZmkiXdxGxWZpNqiYhuHeHKtg7YE4vwHFkxv Whg0K0Eplsbfhk5BHi7rWpk7g4TZXFXm5akkmRoYijEAyDYs0SsUnidjugIAl1DWcDCM/yHmUyhxR Zodpy+p7EMft2PMU73lUoRfZYZtgkpGnTjZ3ufRfMuHQQzklNkynnAX3L2ZQIIcFSIqDC7L3QOYbG TdI9OJk2PienWJQA2IaYyKNiMLkwt9RM5cSZyg2tVJxnMxnMW1f1BUxkO8zrznS/1CKCMKHoWy+rY E7fS8CDAwrK90DOI9zEVPCRLJ4Jzh6+Ttc4IgJSzwOaEwDeOwDEPDXtEplRuNWtQ==; Received: by sipsolutions.net with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.98.1) (envelope-from ) id 1uFqZx-0000000E7Ec-2b3M; Fri, 16 May 2025 10:38:05 +0200 Message-ID: <424fc6a24f3af233fc70296b9995a97c2d7f9e17.camel@sipsolutions.net> Subject: Re: wireless-regdb: Wrong ETSI tranmit power without TPC From: Johannes Berg To: wens@kernel.org, Alexander Wilhelm Cc: linux-wireless@vger.kernel.org, wireless-regdb@lists.infradead.org Date: Fri, 16 May 2025 10:38:04 +0200 In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.54.3 (3.54.3-1.fc41) Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-malware-bazaar: not-scanned On Fri, 2025-05-16 at 16:15 +0800, Chen-Yu Tsai wrote: > > The frequencies 5470 - 5725 have a power of 500 mW. It results in 26 dB= m. But I > > believe 27 dBm are allowed. Seems like. But units are hard... The link in the db went stale, but the current versions https://www.bundesnetzagentur.de/SharedDocs/Downloads/DE/Sachgebiete/Teleko= mmunikation/Unternehmen_Institutionen/Frequenzen/Allgemeinzuteilungen/Mobil= funkDectWlanCBFunk/WLAN_5GHz_pdf.pdf?__blob=3DpublicationFile&v=3D1 states (page 5): -------------------- Frequenzband 5470=E2=80=935725 MHz ... Maximale mittlere EIRP f=C3=BCr bandinterne Aussendungen 1 W Ausnahmen: f=C3=BCr Anlagen in Stra=C3=9Fenfahrzeugen gilt eine maximale mittlere EIRP von 200 mW. ... Maximale mittlere EIRP-Dichte f=C3=BCr bandinterne Aussendungen 50 mW/MHz in jedem 1 MHz-Band ... Sendeleistungsregelung (TPC) TPC muss durchschnittlich einen Abschw=C3=A4chungsfaktor von mindestens 3 dB gegen=C3=BCber der h=C3=B6chstzul=C3=A4ssigen Sendeleistung der Systeme erbringen; oder ohne TPC muss die h=C3=B6chstzul=C3=A4ssige mittlere EIRP und die Obergrenze f=C3=BCr die entsprechende mittlere EIRP-Dichte um 3 dB verringert werden. -------------------- So to be _really_ precise you'd end up with 1W reduced by 3dB which of course _is_ precisely 27dBm since 1W is 10^30 or precisely 30 dBm. (Except in "street vehicles", apparently. Rail has its own things, so I guess that really does mean cars/trams/etc.) But given the unit conversions are hard, we should probably just do this in the db in dBm? johannes