It looks like AT&T is looking to use 2.3GHz bands reserved for Sirius radio.  Those in the WiFi space know that Terrestrial repeaters of Sirius radio signals are a major source of outdoor interference - but those repeaters only existed in dense cities.  Now with that spectrum moving to 4G Basestations we will see much more interference in on open areas (like those we like to fly in). This will likely raise the noise floor and reduce the range and reliability of communications in 2.4 GHz.  72 MHz anyone? 

source engadget

Views: 917

Comment by Grips on June 19, 2012 at 6:25pm

50mhz :)


Admin
Comment by Thomas J Coyle III on June 19, 2012 at 7:36pm

If the 2.3GHz spill over does not meet FCC specs, there can be lawsuits to force the FCC to take action in relation to their own rules and regulations.

Just a thought.

Regards,

TCIII

Comment by Charles K Taylor on June 19, 2012 at 8:59pm

I think this is similar to the LightSquared debacle. If it causes issues with devices already in the market then I doubt the FCC will let it happen.  Unfortunately the GPS issue LightSquared caused is a little higher profile...

Comment by Jack Crossfire on June 19, 2012 at 10:04pm

Totinos Pizza Rolls ended the 2.4Ghz party long before the evil conspiring telco.

Comment by Adam Conway on June 19, 2012 at 10:40pm

To respond to two comments:

Mr Coyle: The FCC spectral mask will probably require a 30-50db attenuation off a 30-36dB EIRP (effective TX Power), we are using receivers that operate at -90 dBm or greater sensitivity, the FCC will not save us.  

Mr Crossfire: On Microwaves and WiFi interference - those tend to be different, they actually don't leak outdoors all that much and the duty cycle is low (as a whole).  Mobile carriers are much worse - they are very high duty cycle (or as they say it, they have a high spectral efficiency) and they are trying to transmit all over to provide coverage.  

Given the impact Sirius has had with a small footprint, this scares me much more.  This isn't going to impact your apple TV, but will impact long range wireless in 2.4

Comment by lot on June 20, 2012 at 3:32am
Comment by Krzysztof Bosak on June 20, 2012 at 9:57am

You can tell the mast is pure evil just by looking at it! BTW has anyone did range testing of various 2.4GHz systems vs altitude? I guess those antennas have horizontal radiation pattern. With some assumptions one could fly high and gain extra... ok not in States as it is only 400ft... You are doomed. Good luck.

Comment by Flying Monkey on June 20, 2012 at 2:42pm

I can't say I'd care too much if it ruined 2.4ghz control... but if it wreaks havoc with my (future) Lawmate 2.4 video that'd piss me off!

Comment by Grips on June 20, 2012 at 2:45pm

I'm sure there are other HAM's on here. The other issue at stake is that our Tx's for FPV cause interference, resulting in issues if they narrow you down to be the one causing said interference.

Comment by Flying Monkey on June 20, 2012 at 2:49pm

@ Grips

Yeah, that's true too!  There's another HAM in my neighborhood that lets me know when his club is doing Signal Hunts so I'll know not to fly then... lol.

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