Matioupi
First Officer
Flight distance : 922569 ft
France
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ImHereToCrash Posted at 2017-8-10 22:45
From what I can work out, the hardware used is identical globally, however in EU, the output power is halved...I doubt anything else changes, and is likely in violation of standards. as far as OTG permitting greater range in the EU the data is conflicting on this matter, but given how unpolished the DJI go 4 app is, wouldn’t surprise me if it’s flipped to FCC mode when using usb and not WiFi ..
I totally agree, output is 500mW in FCC mode, and 250mW in EU mode. For spark RC. My home WiFi router at 100% power outputs 1200mW and warns me of regulations using more than 1000mW. I accept I’m in violation and don’t care. It’s only my fault if I’m arrested for using 200mW more power.. the RC in theory can output 1000mW, most WiFi modules are capable of such. In fact the FCC allows up to total effective power of 25 watts (25000mW effective) not output power, that’s effective power.. meaning take antenna gain into effect as well. The US and EU and any other region should just give us an warning we have to accept if we want 1watt output power and whatever’s else. We would be at fault.. not DJi.
I think that this first experience to use an already standardized link (WiFi) vs. proprietary link is quite painfull for DJI...
OTG could solve many things in setups with RC as DJI would only have to do changes on AC+RC where they have source code. On setups with AC+phone only, they have to face phones where 5GHz and DFS implementation is sometimes buggy (especially on Android). Maybe the point would be to reverse and makes phone being the AP instead of Spark being the AP.
Just in case, here is the ETSI document for exacts rules in Europe w.r.t. 5Ghz :
http://www.etsi.org/deliver/etsi ... _301893v020101p.pdf
What's pretty sure is that Spark AC+RC hardware is not localized, the power and channel restrictions are made at software "driver" levels (that's the way it's done in most WiFi dongle Linux drivers and probably other OS too, but I could only have a look to Linux as they are open source). So they could let us do our choices for regdom and channels wherever we live (or in case we travel abroad with devices)
That's 2 month now since Spark is out and this issue has been discovered and still no fix... In my opinion, this is too long with respect to the issue "complexity" and also with respect to product lifecycle...
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