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Tue, 28 Apr 2026 00:44:51 -0700 (PDT) From: Louis Kotze To: K900 Cc: Chen-Yu Tsai , Valeriy Kosikhin , wireless-regdb@lists.infradead.org, linux-wireless@vger.kernel.org Subject: Re: [PATCH] wireless-regdb: allow 320MHz channel width for Russia Date: Tue, 28 Apr 2026 09:44:47 +0200 Message-ID: <20260428074500.ru-320-review-resend@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20250708-russia-320-v1-1-53641e8dd417@0upti.me> References: <20250708-russia-320-v1-1-53641e8dd417@0upti.me> Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit ChenYu, thanks for the ping on this one. Cross-checked against SCRF 22-65-05 (which added 5925-6425 MHz to the 2007 spectrum allocation, Appendix 2): Section 2 ("Devices with direct sequence spread spectrum and other modulation types") for 5925-6425 MHz specifies: LPI: max EIRP 200 mW, max PSD 10 mW/MHz, indoor only, with automatic power control VLP: max EIRP 25 mW, max PSD 1.3 mW/MHz, indoor only No channel-width restriction is specified for this category. The only width cap (less than 20 MHz) applies to the FHSS subsection, not to DSSS / 802.11-style modulation. SCRF 23-68-03 ยง3.1 later replaced "automatic power control" with "LBT mode" globally in that appendix, which the 802.11 CCA mechanism satisfies. 320 MHz operation at the 200 mW LPI cap gives 0.625 mW/MHz, well under the 10 mW/MHz PSD ceiling, so the wider channel stays compliant on both EIRP and PSD limits. Per regdb convention of encoding the spectrum allocation ceiling and leaving per-standard equipment certification to drivers, the bandwidth widening is sound. Reviewed-by: Louis Kotze Note that the patch base predates the recent RU power update (commit 6873bfe in wens/wireless-regdb), which changed 5925-6425 from 100 mW to 200 mW, so this needs a rebase on current HEAD before it can be applied. Regards, Louis