File transfer speed and distance from base station?

I tested the file transfer time (outside with no obstructions) by moving a large video file between my MacBook and a computer wired to an Airport base station. The times were the same as distance increased until the connection dropped. Why?

Do the calculations.
(Although wireless qualifies more for voodoo project than science).
500MB translates to 5.7MB/s which is near enough to 46Mbits/s
500MB in 94sec is 42.6Mbits/s
That is really slow for 5ghz at such close distance to the airport.
What OS are you running? Please open the wireless diagnostics.
About Wireless Diagnostics - Apple Support
Run the wireless utility.
And get the actual link speed and how well it is working.
Then use iperf to get actual network speeds. Rather than moving a file test the link rates.
iperf is included in Mac OS and is available via terminal.
This post gives some clues. http://acidx.net/wordpress/2013/05/testing-a-network-connection-with-iperf/
I think your seeing a hold up due to slow ethernet say.. 100mbit ethernet will ruin any numbers you are trying to get in tests. As well as older slow Mechanical hdd in laptops.
But the link speed in the Utility will tell you the story.. if you link at 450Mbps which should be possible up close.. and it drops to say 200Mbps at a range of 130M you are still far faster than the rate determining step.. very likely to be a slow disk plus slow ethernet.
Go to the performance tab.. and keep it running as you move the computer from next to the Airport to the 130M point. You should see a pretty large drop in connect speed.. but you also need to keep this running as you transfer files.. since it tends to vary greatly during a file transfer.
For science experiments.. this is already a pretty good one.. you are trying to determine the rate determining step in a network system and why wireless is not causing the problem you expected. The use of actual diagnostic tools is great.. almost like science.
The big spike in this graph is me changing from 2.4ghz to 5ghz.

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There is no option to set the Qos to zero. I can set it to "auto" in which case the number has no effect.
I could set it to manual but it restricts me to a range as you can see from the graphic.
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website with the current manpage:
http://linux.die.net/man/8/iwconfig
or simply:
$ man iwconfig
Last edited by stefanwilkens (2010-09-13 11:11:37)

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