On Thu, 31 Jul 2014 10:19:38 -0400, Jerry Stuckle
wrote:

And of course there's the now infamous hair salon in San Antonio, Tx,
with the fluorescent light ballasts that caused problems to AT&T Cell
phone network (and it seems this is not the only business with this
problem).

The hair salon refused to do anything about it so they got a letter
from the FCC.
http://www.commlawblog.com/2013/10/articles/enforcement-activities-fines-f/bulbs-behind-bars-ii-fcc-goes-after-hair-salon-lighting-fixture/
Seems to be a common problem. Here's one in Smog Angeles:
http://www.pcworld.com/article/2095940/la-buildings-lights-interfere-with-cellular-network-fcc-says.html
My guess(tm) is electronic ballasts.

My favorite was GPS interference from TV amplifiers:
http://gpsworld.com/the-hunt-rfi/
I was not involved in either the cause or solution.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558