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fnordianslip is offline fnordianslip
2010-01-12 , 20:39
Posts: 670 | Thanked: 359 times | Joined on May 2007
#21
Originally Posted by fraaaaanka View Post
I did a run round the main places i use my N900 in the house to test the quality (using Conky) once using 10mW and once using 100mW.
Here are the results

..........................100mW..........10mW
next to pc............100%..........100%
kitchen................63%..............60%
bedroom.............55%..............58%
toilet ............41%.............43%

so from that there is no difference to the quality on 10mW or 100mW it just depends on the question .... what extra battery time do you get.
Maybe i should fully charge the battery, stream in video on 100mW and see how long it takes till the battery dies then recharge and retry on 10mW
You are measuring the received signal strength on the N900. That's pretty irrelevant. You need to look at the 'Rate' in conky, to see if that drops. With the lower power output, the wifi link will drop to a lower rate in some places as the signal received by the access point will drop below the signal to noise ratio required to sustain the higher rate.

Also, IIRC, with a lower tx power from the N900, the access point may well increase its power, if it assumes that the connection is symmetric, so that could also affect the Connection Quality reported by Conky.
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Humour . : [#######---] Alignment: Apathetic anarchist
Patience : [####------] Weapon(s): My cat, my code.
Agro ... : |#---------] Relic(s) : N900, MacBookPro, NSLU2, N800, SheevaPlug, Eee-901, Core2-Quad, PS3
"In theory, theory and practice are the same. In practice, they're not."
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fraaaaanka is offline fraaaaanka
2010-01-12 , 20:54
Posts: 436 | Thanked: 298 times | Joined on Jan 2010 @ England
#22
Originally Posted by fnordianslip View Post
You need to look at the 'Rate' in conky, to see if that drops. With the lower power output, the wifi link will drop to a lower rate in some places as the signal received by the access point will drop below the signal to noise ratio required to sustain the higher rate.
i initially did write down the Mb/s at each point but i found the figure would change constantly on both 10mW and 100mW ..... maybe when the wifi was being used or something.

related:
http://m.mippin.com/mip/plus/story.j...63329528013136
http://talk.maemo.org/showthread.php?t=36444

I dunno ... i might just leave it on 100mW and buy a spare battery!!!!!
lol
 
Milhouse is offline Milhouse
2010-01-12 , 20:58
Posts: 3,401 | Thanked: 1,255 times | Joined on Nov 2005 @ London, UK
#23
Originally Posted by go1dfish View Post
Would be very nice if the wifi power options were specifiable per access point instead of globally.

Some routers/locations work great with things turned down, others not so much.
The issue you describe is bug #2821 which is going to be fixed in Harmattan.

Also comment #6 from that bug is relevant:

I might be wrong on this this, but I think that the
setting refers to maximum output, i.e. even when setting to 100mW it won't
consume that always, it will conserve power, and consume up to 100mW when
needed.

So the users do not really save power by switching manually between 10mW and
100mW...
This setting makes no real difference in terms of power consumption, it's mainly a regulatory issue but may improve the stability of a weak WiFi connection.
 
colnago is offline colnago
2010-01-12 , 21:14
Posts: 518 | Thanked: 160 times | Joined on Dec 2009
#24
Originally Posted by That One Guy View Post
My Back yard is bigger than your whole neighborhood.

Sorry. Couldn't help myself. Just had to get into this "my back yard is bigger than yours" contest. LMAO

/hijack
Yeah, townhouses "typically" do not have "ponderosas" and "mesas" as backyards.

 
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mthmob is offline mthmob
2010-01-12 , 21:34
Posts: 378 | Thanked: 206 times | Joined on Dec 2009 @ Denmark
#25
Originally Posted by fraaaaanka View Post
Hi There All,

I read this somewhere
Adjusting the power from 100 to 10mW on the wireless, saves battery
Settings- Internet connections - connections - "Edit one of your connections"- Click Next 3 times . click Advanced - Other

Bu wanted to see if any of you guys know

1) is it worth it - does it save much battery power

2) What will the trade off be ... whats the negative point of it? lower speed connection?

Cheers

On 100mw my n900 drained battery seriously fast (by this i mean.. atleast 50% battery in 1 hour), on 10mw i'm able to be connected pretty much a hole day, and surf for hours.

maybe my router causes the huge power consumption on 100mw, maybe not. One thing is 100% for sure, 100mw kills my battery.. faaast on my home router.

I can still reach max speed on my 20mbit adsl at home even though i'm only using 10mw setting.
Last edited by mthmob; 2010-01-12 at 21:38.
 

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ndi is offline ndi
2010-01-13 , 00:59
Posts: 2,050 | Thanked: 1,425 times | Joined on Dec 2009 @ Bucharest
#26
I noticed that as a rule by the time the 10 mW is insufficient I'm almost out of range with the recv. The actual range cut is not that dramatic, due to limited receiving antenna. Might be my local setup/noise, but that's how it works in practice here.
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fnordianslip is offline fnordianslip
2010-01-19 , 19:14
Posts: 670 | Thanked: 359 times | Joined on May 2007
#27
Originally Posted by ndi View Post
I noticed that as a rule by the time the 10 mW is insufficient I'm almost out of range with the recv. The actual range cut is not that dramatic, due to limited receiving antenna. Might be my local setup/noise, but that's how it works in practice here.
The wifi antenna should, in theory [Note: see my sig ], and assuming that the same antenna is used for transmission and reception, perform equally well (or badly) for transmission and reception. There may be other issues making the connection asymmetric, e.g. noise levels.

Sorry if i seem like I'm being pedantic.
__________________
Class .. : Lame hacker & beardy boffin
Humour . : [#######---] Alignment: Apathetic anarchist
Patience : [####------] Weapon(s): My cat, my code.
Agro ... : |#---------] Relic(s) : N900, MacBookPro, NSLU2, N800, SheevaPlug, Eee-901, Core2-Quad, PS3
"In theory, theory and practice are the same. In practice, they're not."
--
Beware of extras-devel.
 
Laughingstok is offline Laughingstok
2010-01-19 , 20:23
Posts: 472 | Thanked: 442 times | Joined on Sep 2007
#28
Does. It. Save. Battery?

That is the question no one is directly answering.
__________________
If you don't know how to check your N900's uptime, you probably shouldn't own it.
 
wmarone is offline wmarone
2010-01-19 , 20:25
Posts: 1,746 | Thanked: 2,100 times | Joined on Sep 2009
#29
Yes. You're transmitting using 1/10th of the power, thus you will save battery power.

However, of far greater impact are the powersave modes. Sadly, I can't use these with my router at home and as a result even at 10mW my battery is sapped quickly if I leave it on WiFi (as compared to 2.5G) at work where the routers are better I get about 3/4 a day (music, constant data traffic) with wifi on.
 
egoshin is offline egoshin
2010-01-19 , 20:32
Posts: 992 | Thanked: 995 times | Joined on Dec 2009 @ California
#30
Guys, 10mW or 100mW is a MAXIMUM power.

It means, that if you have a good reception then N900 will not reach 100mW but works on less power (if powersaving is ON, of course).

If you haven't good reception - you need 100mW max, right?

BTW, this parameter is for legal reason only - some countries limit the max output.
 
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