[FS#80] LEDE US Region 5 GHz WLAN TX Power Limits don't match current FCC limits

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - Jon Grossart (jon.grossart) 

Attached to Project - LEDE Project
Summary - LEDE US Region 5 GHz WLAN TX Power Limits don't match current FCC limits
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - I noticed this issue looking into the wifi transmit power settings on the Archer C2600 (v1.0, US region). I'm not sure what is changeable in the LEDE code itself versus what is HW encoded.


iw reg get

country US: DFS-FCC
        (2402 - 2472 @ 40), (N/A, 30), (N/A)
        (5170 - 5250 @ 80), (N/A, 23), (N/A), AUTO-BW
        (5250 - 5330 @ 80), (N/A, 23), (0 ms), DFS, AUTO-BW
        (5490 - 5730 @ 160), (N/A, 23), (0 ms), DFS
        (5735 - 5835 @ 80), (N/A, 30), (N/A)
        (57240 - 63720 @ 2160), (N/A, 40), (N/A)

FCC Regulation: http://www.ecfr.gov/cgi-bin/text-idx?node=47:1.0.1.1.16#se47.1.15_1407

**U-NII-1 (5.15-5.25 GHz)**


  * §15.407(a)(1)(i) and §15.407(a)(1)(ii)

  * limit for AP can be up to 1 W/30 dBm
 
  * openWRT/LEDE limits it to 23 dBm rather than 30 dBm

**U-NII-2A/C (5.25-5.35 GHz and 5.47-5.725 GHz)**

  * §15.407(a)(2)

  * limit for AP is the lesser of 250 mW [24 dBm] or 11 dBm + 10 log B, where B is the 26 dB emission bandwidth in megahertz
 
  * openWRT/LEDE limits it to 23 dBm rather than 24 dBm

**Extra Supporting Documentation:**

  * https://www.fcc.gov/document/5-ghz-u-nii-ro

  * https://transition.fcc.gov/bureaus/oet/ea/presentations/files/oct14/51-New-Rules-for-UNII-Bands,-Oct-2014-TN.pdf

  * http://www.silexamerica.com/unwired/fcc-5ghz-regulations/

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=80