Comparing Tx power settings - general noob questions

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MountainX
DD-WRT Novice


Joined: 28 Dec 2013
Posts: 41

PostPosted: Sat Oct 06, 2018 21:58    Post subject: Comparing Tx power settings - general noob questions Reply with quote
On my Netgear R7000, the default Tx power setting with dd-wrt is 71 mW.

On my TP-Link Archer C7 v4, the default Tx power setting with dd-wrt is 16 mW.

Are those values directly comparable? What does the higher value on the R7000 mean? Does it mean the antennas are less efficient, and thus need more power? Or does it mean that the default value is much higher for some other reason?

I don't need extra range, and I would like to keep the Tx power as low as possible while still maintaining a good signal. I found that 12 mW works fine on the Archer C7. Can I also expect 12 mW to work the same on the R7000? If so, why is the default value so much higher (71 vs 16)?
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ian5142
DD-WRT Guru


Joined: 23 Oct 2013
Posts: 2319
Location: Canada

PostPosted: Sun Oct 07, 2018 11:35    Post subject: Archer C7 Reply with quote
Actually, you should look again. On the Archer C7 v4 it is 16dBm. This is a logarithmic value. See this for more info: https://wiki.dd-wrt.com/wiki/index.php/Atheros/ath_wireless_settings#TX_Power

Broadcom is here: https://wiki.dd-wrt.com/wiki/index.php/Advanced_wireless_settings#TX_Power

_________________
Before asking a question on the forums, update dd-wrt: Where do I download firmware? I suggest reading it all.
QCA Best WiFi Settings


Some dd-wrt wiki pages are up to date, others are not. PM me if you find an old one.

Atheros:
Netgear R7800 x3 - WDS AP / station, gateway, QoS
TP-Link Archer C7 v2 x2 - WDS Station
TP-Link TL-WDR3600 v1 - WDS Station
TP-Link 841nd v8 - NU
D-Link 615 C1/E3/I1 x 7 - 1 WDS station
D-Link 825 B1 - NU
D-Link 862L A1 x2 - WDS Station
Netgear WNDR3700v2 - NU
UBNT loco M2 x2 - airOS

Broadcom
Linksys EA6400 - Gateway, QoS
Asus N66U - AP
Netgear WNDR3700v3 - not used
MediaTek
UBNT EdgeRouter X - switch
MountainX
DD-WRT Novice


Joined: 28 Dec 2013
Posts: 41

PostPosted: Sun Oct 07, 2018 19:50    Post subject: Re: Archer C7 Reply with quote
ian5142 wrote:
Actually, you should look again. On the Archer C7 v4 it is 16dBm. This is a logarithmic value. See this for more info: https://wiki.dd-wrt.com/wiki/index.php/Atheros/ath_wireless_settings#TX_Power

Broadcom is here: https://wiki.dd-wrt.com/wiki/index.php/Advanced_wireless_settings#TX_Power


Thank you!!! https://wiki.dd-wrt.com/wiki/index.php/Advanced_wireless_settings is a great page. I never found it previously, but now that I know about it, it answers many of my questions.
ian5142
DD-WRT Guru


Joined: 23 Oct 2013
Posts: 2319
Location: Canada

PostPosted: Sun Oct 07, 2018 20:44    Post subject: Wiki page Reply with quote
Note, the Advanced and Basic pages are technically only for Broadcom. Atheros has the separate page with all of the settings.

Note, I am the one that created the Advanced and Basic pages, not the Atheros one though.

_________________
Before asking a question on the forums, update dd-wrt: Where do I download firmware? I suggest reading it all.
QCA Best WiFi Settings


Some dd-wrt wiki pages are up to date, others are not. PM me if you find an old one.

Atheros:
Netgear R7800 x3 - WDS AP / station, gateway, QoS
TP-Link Archer C7 v2 x2 - WDS Station
TP-Link TL-WDR3600 v1 - WDS Station
TP-Link 841nd v8 - NU
D-Link 615 C1/E3/I1 x 7 - 1 WDS station
D-Link 825 B1 - NU
D-Link 862L A1 x2 - WDS Station
Netgear WNDR3700v2 - NU
UBNT loco M2 x2 - airOS

Broadcom
Linksys EA6400 - Gateway, QoS
Asus N66U - AP
Netgear WNDR3700v3 - not used
MediaTek
UBNT EdgeRouter X - switch
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