On 25/08/11 07:28, Tim wrote:
> On Thu, 2011-08-25 at 18:04 +1200, Shiv Manas wrote:
>> I can happily recommend any Alfa brand USB WiFi adapters - they have a
>> long range, are compatible with most distros, and are very affordable.
>> Personally I use the AWUS036NH which has a massive 2W output.
> Two whole watts?! Seems a bit extreme, unless it's designed for long
> distance work (such as across a factory). It's probably more than your
> allowed for general purpose networking.
> Just the other day I experimented with the power output from my access
> point. It was set on maximum, and my laptop is barely two feet from it.
> Yet, Fedora's signal meter was always around 95%, occasionally dipping
> down to lose a whole bar on the graphical display (whatever that
> actually means), which made no sense. I'd expect 100% being that close,
> especially since I've used the laptop in another room, with three brick
> walls between them, and not noticed a huge loss on the signal meter.
> So, I've turned the access power down to minimum (12.5%). And Fedora's
> signal meter reading hasn't changed in the slightest, nor is there any
> noticeable change in network performance. So, I can't tell if the
> access point has actually changed signal level, or whether Fedora's
> meter is *more* concerned with some other factors than signal strength.
> I don't place a lot of faith in the signal metering.
I suspect that receiver quality is a bigger factor that transmitter
power output. I am presently using a Linksys E3000 running DD-WRT which
displays some receiving data [SNR, signal to noise ratio]. I have no way
of verifying these numbers but have no reason to doubt them either. I
have also noticed that signal quality affects the data rates. Good
signal, faster transfers ...
> Wireless Nodes
> MAC Address Interface Uptime TX Rate RX Rate Signal
> Noise SNR Signal Quality
> 00:1E:52:86:4B:C3 eth1 N/A N/A N/A -42 -88 46
> B8:FF:61:35:AC:CC eth1 N/A N/A N/A -52 -88 36
6:84 eth1 N/A N/A N/A -62 -88 26
D:10 eth1 N/A N/A N/A -67 -88 21
> 0C:EE:E6:84:F3:A9 eth1 N/A N/A N/A -55 -88 33
> 00:11:85:8C:CC:25 eth1 N/A N/A N/A -61 -88 27
> 00:02:6F:9B:BA:C4 eth1 N/A N/A N/A -42 -88 46
> 00:1D:73:C9:11:94 eth1 N/A N/A N/A -57 -88 31
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