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FS#1861 - WIFI TX power cannot be set to maximum on TP-Link TL-WR842N/ND v2 (Atheros AR9341 rev 3) #6631

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openwrt-bot opened this issue Sep 20, 2018 · 2 comments
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antonio.floresta:

OpenWrt 18.06.1 r7258-5eb055306f / LuCI openwrt-18.06 branch (git-18.228.31946-f64b152)

In the /etc/config/wireless, when I set the country to 'BR', channel to '13' and txpower to 20. After wifi down/wifi or reboot, the iwinfo reports Tx-Power: 16 dbm.
If I set the country to 'US', channel to whatever and txpower to 21, the iwinfo reports Tx-Power: 21 dbm.
Below is the configuration details for country = 'BR':

wireless.radio0=wifi-device
wireless.radio0.type='mac80211'
wireless.radio0.path='platform/ar934x_wmac'
wireless.radio0.hwmode='11g'
wireless.radio0.htmode='HT20'
wireless.radio0.beacon_int='100'
wireless.radio0.disabled='0'
wireless.radio0.txpower='20'
wireless.radio0.country='BR'
wireless.radio0.channel='13'
wireless.radio0.legacy_rates='1'
wireless.radio0.antenna_gain='0'

Below is the iwinfo output:
wlan0 ESSID: "WIFI xxxxxxxx"
Access Point: xx:xx:xx:xx:xx:xx
Mode: Master Channel: 13 (2.472 GHz)
Tx-Power: 16 dBm Link Quality: 38/70
Signal: -72 dBm Noise: -95 dBm
Bit Rate: 16.3 MBit/s
Encryption: WPA2 PSK (CCMP)
Type: nl80211 HW Mode(s): 802.11bgn
Hardware: unknown [Generic MAC80211]
TX power offset: unknown
Frequency offset: unknown
Supports VAPs: yes PHY name: phy0

@openwrt-bot
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adrianschmutzler:

So, what's the maximum allowed txpower in Brazil?

The txpower actually used on your device will be that minus the antenna gain of the device. (This has been broken on 17.01)

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alemoh1234:

as far as I know, brazil`s maximum power is 30dbm (from what I found in the internet and regulations).

also, I just installed openwrt today, on the same router, and had the same problem, can confirm something is very wrong.

obs: I bought mine in the US

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