[Battlemesh] 5 Ghz wifi: where did channel 32, 68 and 96 go?
kristoff at skypro.be
Fri Mar 4 10:16:56 CET 2016
(I posted this this morning but for reason, it did not get on the list,
nor the archive. 2nd try. My appologies if it gets posted twice).
I am still new to meshed networking (mainly interested from a ham-radio
point of view), so please excuse my (perhaps lame) questions.
I am currently reading some stuff on wifi, especially concerning the 5
When looking at the European frequency map (as found or efis.dk), it
notes the three bands for rlan: 5.150-5.250, 5.250-5.350 and 5.470 to
Concerning the low bands, concidering 20 Mhz of bandwidth, I would have
exepected to see 10 channels (200 Mhz / 20 Mhz), starting with channel
32 up to 66; but I only see 8. The channel 5.150-5.170 (which I guess
should be channel 32- and 5.330-5.350 (channel 68) do not seams to exist.
The same thing for would-be channel 96 (5.470-5.490 Ghz).
Is there a technical reason for this?
Adjecent-band protection? (these channels are all at the ends of the
Or to provide the primairy users 20 Mhz of spectrum assured without
interference of wifi ?
As I am currently playing around with modifying linux kernel-modules (to
get these devices to operate on ham-radio spectrum), I have concidered
modifying these modules to access these channels anyway -as a wifi-user,
I know the regulation might be different from country to country, but
would it be legal to do this? As far as I see in the Belgian legislation
only talks about these frequenct bands, not about actual channels.
If I would use a raspi as access-point and linux-clients, that would be
a nice thing to do. :-)
Cheerio! Kr. Bonne.
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