[PATCH] wireless-regdb: update rules for US on 2.4/5G

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The bands are wider and more continuous:
5.15-5.35 GHz, 5.47-5.725 GHz and 5.725-5.85 GHz.
Based on the April 2, 2020 version of e-CFR Title 47 Part 15,
Radio Frequency Devices.

This also includes a small tweak for channel 144 similar to TW.

Signed-off-by: bkil <b.K.il.h.u+tigbuh@xxxxxxxxx>
---
 db.txt | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/db.txt b/db.txt
index 9c4b447..6096121 100644
--- a/db.txt
+++ b/db.txt
@@ -1556,13 +1556,19 @@ country UG: DFS-FCC
 	(5490 - 5730 @ 160), (24), DFS
 	(5735 - 5835 @ 80), (30)
 
+# https://www.ecfr.gov/cgi-bin/text-idx?SID=eed706a2c49fd9271106c3228b0615f3&mc=true&node=pt47.1.15&rgn=div5
+# Title 47 Part 15 - Radio Frequency Devices, April 2, 2020
 country US: DFS-FCC
-	(2402 - 2472 @ 40), (30)
+	(2400 - 2483.5 @ 40), (30)
 	# 5.15 ~ 5.25 GHz: 30 dBm for master mode, 23 dBm for clients
-	(5170 - 5250 @ 80), (23), AUTO-BW
-	(5250 - 5330 @ 80), (23), DFS, AUTO-BW
-	(5490 - 5730 @ 160), (23), DFS
-	(5735 - 5835 @ 80), (30)
+	(5150 - 5250 @ 80), (23), AUTO-BW
+	(5250 - 5350 @ 80), (23), DFS, AUTO-BW
+	# This range ends at 5725 MHz, but channel 144 extends to 5730 MHz.
+	# Since 5725 ~ 5730 MHz belongs to the next range which has looser
+	# requirements, we can extend the range by 5 MHz to make the kernel
+	# happy and be able to use channel 144.
+	(5470 - 5730 @ 160), (23), DFS
+	(5730 - 5850 @ 80), (30)
 	# 60g band
 	# reference: section IV-D https://docs.fcc.gov/public/attachments/FCC-16-89A1.pdf
 	# channels 1-6 EIRP=40dBm(43dBm peak)

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