Wireless Waffle - A whole spectrum of radio related rubbish
Wire-More LAN (Part IV)signal strength
Friday 27 April, 2007, 14:51 - Radio Randomness
Another train journey, another chance to run good ole Netstumbler and do a survey of channel occupancy for 2.4 GHz (that's 802.11b, g and n and not 802.11a in case you were wondering) to see whether my previous analysis of which are the best WiFi channels to use still holds.

For those who haven't (or can't be bothered to) read my previous article, I came to the conclusion that if you lived in an area of high WiFi penetration, channel 1 was the best channel to use as it was the least likely to suffer interference from other Wireless LAN users. In areas where there was unlikely to be any other wireless LAN activity, channel 11 (or 12, or 13) would be best, as these are the most free from other interferers (e.g. the military, microwave ovens, radio amateurs and so forth).

wifiscan1

So what are the results of this train journey? I've plotted them above. I've shown the outbound journey separate from my return journey. As it's highly possible that if I picked up a LAN in one direction, I might have equally picked it up in the other, I've filtered the return numbers to take account of this. Also, I kind of half forgot to switch my system on on the outbound journey so, as you can see, the results for the return journey show many more LAN's than the outbound!

The upshot remains exactly the same as before (phew!) Channel 1 continues to be the best channel to use if you are in an area saturated with other users. Remember when looking at the above graph that channels 2 to 5 interfere with channel 1 and as such are not independent - equally they interfere wich channel 6 - only channels 1, 6 and 11 (or 1, 7 and 13) are actually free from interference from each other. My arguments about channel 11, 12 or 13 being the best to use in quiet areas remain unchallenged.

As a postscript, I though you might enjoy one or two of the network SSID's (names) that I found during my journey. Here are my favourites:

ideal cleaning wireless'Bleach2006'
'bombolong'
'GARY BARLOW' (was it really...?!)
'Ideal Cleaning Wireless'
'legal loonies'
'SLAPHEADS NETWORK'
'supermonkey
'the wardrobe'
'TOAST'
':)'

and my absolute favourite: 'FRAUDULENT'...! Also, a few other vaguely interesting facts and figures:

Number of networks called 'BTVOYAGER': 12
Number of networks called 'BTHomeHub': 45
Number of networks called 'SKYxxxxx' (where xxxxx is a 5 digit number): 30
Number of networks called 'Belkin54g': 10 (and 7 of them were open)
Number of networks called 'default': 5 (all of them open)
Number of networks called 'linksys': 10 (4 of them were open)
Number of networks called 'NETGEAR': 16 (10 of them were open)
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