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maxximuscool is offline maxximuscool
2009-12-11 , 11:00
Posts: 3,664 | Thanked: 1,530 times | Joined on Sep 2009 @ Hamilton, New Zealand
#21
you meant setting the Wifi signal strength on the router save your n900 battery? that is insanely busted. How can wifi signal strength effect your battery power? I dont get it lol..

Please explain more. I'll try it out when mine arrives
 
benjijk is offline benjijk
2009-12-11 , 11:02
Posts: 11 | Thanked: 1 time | Joined on Dec 2009
#22
I'm going to try cutting down to 10mw. I'm sure it makes a difference. The other thing is the option to connect whenever wi-fi is available option. This will cause the N900 to search every few minutes ( you can set the rate) for a wi-fi network. This in my opinion, similar to cell tower searches (*) cause significant battery drains. I noticed that today. I put off the option, and the battery lasted a lot longer. Now I will try with the 10mw option and post when/if I notice a difference.

* - Cell-tower search. I have noticed this with different phones. When you are in an area with no phone network connectivity, I have noticed that the battery drains in a matter of hours. Upon searching on the issue I found that phones tend to increase power to search and connect to a network. When there are no networks around, it continues searching every few minutes. This causes rapid power drains even though you're not even talking or using the cellphone.

I suspect its similar with Wi-Fi searches. So the solution I think would be to simply turn it off and choose your network (Carrier or Wifi) when you need it.
 
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mthmob is offline mthmob
2009-12-11 , 11:19
Posts: 378 | Thanked: 206 times | Joined on Dec 2009 @ Denmark
#23
Originally Posted by maxximuscool View Post
you meant setting the Wifi signal strength on the router save your n900 battery? that is insanely busted. How can wifi signal strength effect your battery power? I dont get it lol..

Please explain more. I'll try it out when mine arrives
Its not a router setting. you can set 100mW/10mW on your n900.. thats what i'm talking about anyway.
 
TA-t3 is offline TA-t3
2009-12-11 , 12:18
Posts: 3,841 | Thanked: 1,079 times | Joined on Nov 2006
#24
All those arguing why, despite what some of us says, 10mW does seem to make a difference: Please read the thread better! We already know (from another poster) that there's currently a bug in the N900 which would make this a difference (wi-fi doesn't shut down properly).

So, for now, if the 10mW setting does make a difference to your battery time, feel free to use that setting. Nobody will call you names. However, when this bug gets fixed you would be better off setting it back to 100mW. See http://talk.maemo.org/showpost.php?p...3&postcount=18 above.
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hsmade is offline hsmade
2010-05-27 , 08:24
Posts: 48 | Thanked: 26 times | Joined on Feb 2010 @ UT@NL
#25
Originally Posted by fnordianslip View Post
It depends what your walls are made of and how much loss there is in them. However, on the basis that the construction of your wall isn't changing, its down to the link budget. 10mW is 10dB less than 100mW. 6dB less signal will halve your range. With 12dB less, the range will be 1/4 of the original range.

So my guess is that with all else being equal, the maximum range with 10mW will be a little bit more than one quarter of the range with 100mW.
3dB is a factor 2
6dB is a factor 4
10dB is a factor 10

In radio we define that 6dB is one 'S' point, doubling the 'range'.

And yes, of course, if you lower the output power by a factor 10, the amount of power needed to generate that output is also lower (not by a factor of 10, as it depends on how the amplifier works etc).

PH7Wim
Last edited by hsmade; 2010-05-27 at 08:27.
 
lanwellon is offline lanwellon
2010-06-27 , 06:36
Posts: 152 | Thanked: 47 times | Joined on Feb 2010 @ Shanghai, China
#26
Originally Posted by GeneralAntilles View Post
Yes, what TA-t3 said. This is a regulatory setting only!

Setting you WiFi to 10mW will not measurably improve your battery life!

In certain situations it may actually reduce it.
Any prove ?
 
lanwellon is offline lanwellon
2010-06-27 , 06:36
Posts: 152 | Thanked: 47 times | Joined on Feb 2010 @ Shanghai, China
#27
Originally Posted by mthmob View Post
Thats weird, first day i got it, i managed to go from full battery to half in like 1-2 hours. Now since i switched to 10mW.. i hardly notice any battery drain at all...
Exactly the same test result !

Agree with you !
 
bertolt is offline bertolt
2010-06-27 , 18:06
Posts: 109 | Thanked: 12 times | Joined on May 2010
#28
holy macaroni! tried the 10mw and yes it does make the battery last longer! with wifi enabled and email set to check every 15 mins, after 7 hrs i with 100mW i had 1 bar left. using 10mW same condition only 1 bar was consumed.
 
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ed00 is offline ed00
2010-06-28 , 00:19
Posts: 277 | Thanked: 215 times | Joined on Dec 2009
#29
Most 802.11 devices use between 1 & 100 mW of power

1 mW(milliwatt) = 0.001 Watt
10mW = 0.01W
100mW = 0.1W

http://en.wikipedia.org/wiki/DBm
 
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javispedro is offline javispedro
2010-06-28 , 00:35
Posts: 2,355 | Thanked: 5,249 times | Joined on Jan 2009 @ Barcelona
#30
Originally Posted by TA-t3 View Post
All those arguing why, despite what some of us says, 10mW does seem to make a difference: Please read the thread better! We already know (from another poster) that there's currently a bug in the N900 which would make this a difference (wi-fi doesn't shut down properly).
Can you reproduce it? File that on the bug report.

I personally cannot reproduce any of the Wi-Fi bugs, and my battery lasts around 4 days (with or without 100mW which as many people have said it's very much useless to idle times). Note that the biggest improvements in Wi-Fi battery life can usually be accomplished by selecting a proper AP... or careful configuration of the router, not the N900.
 
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