[Battlemesh] FCC Contacts about Wifi Regulations

Paul Gardner-Stephen paul at servalproject.org
Sat Aug 6 09:52:40 CEST 2016


For WiFi we just default to channels 1-11 on 2.4GHz, as that is the only
WiFi band we are using. It is the 900MHz band where the differences are
much greater (868MHz in Europe vs 902-925MHz in USA, 912-928 in Australia,
921-928 in NZ, 917-923 or something odd like that in Israel etc).  Thus,
while I would love it if there was a functional minimum set of parameters,
this is not the case for us.


On Sat, Aug 6, 2016 at 11:40 AM, David Lang <david at lang.hm> wrote:

> On Fri, 5 Aug 2016, Juliusz Chroboczek wrote:
> LiPo batteries with JST-PH connectors are available in every toy store,
>>>> but I have no idea about LiFePO4.  I suggest you go to your local toy
>>>> store (pick one with expensive model planes), and check what's readily
>>>> available (as opposed to what needs to be ordered).
>> Yes, LiPo can work, in which case a regular USB LiPo battery pack is the
>>> simplest solution we would aim for there I think.
>> The LiFePO4 specification came from some further requirements that have
>>> not
>>> been discussed yet, in particular, around safety and longevity of the
>>> batteries.
>> Don't speak to us, speak to the people who build model planes and other
>> fancy toys.  They know what they're doing, and their market is very
>> sensitive to price.
>> (And listen to what they have to say.)
> Model aircraft have much higher current requirements, and much lower time
> requirements for their batteries.
> They also don't directly have to worry about rapidly getting a bunch of
> devices into a country from a standing start.
> so far, only the EU has any policies requirng APs to be locked down, so
> only the EU versions of the devices would not be directly flashable with
> third party software.
> I don't like the idea of special power cords, but I also don't like the
> idea of having to have two plugs, one for power and one for the regulatory
> domain.
> I will point out that the regulatory domain does not have to be set. Linux
> defaults to the least common denominator of all the regulatory domains by
> default. If you use a separate power vs regulatory dongle, you could have
> no dongle == worldwide safe and then dongles would only be needed to enable
> additional local channels/power.
> yes this means you don't get channels 12 and 13 in Japan, but in practice,
> channel 11 and 13 are too close together so having 12 and 13 available
> really doesn't give you a fourth usable channel.
> on 5GHz, the value of country specific settings is FAR more significant,
> and there, most places will benefit significantly from local settings. But
> with 2.4GHz and 900MHz, it may be that it's just not worth bothering.
> David Lang
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