|
Grex > Music3 > #80: Clear Channel taking over the radio world |  |
|
| Author |
Message |
| 9 new of 76 responses total. |
gull
|
|
response 68 of 76:
| 
Mar 19 21:35 UTC 2002 |
Re #66: It's illegal to intentionally interfere with a licensed
service. If you're emitting a legal signal and it interferes with
someone else's receiver, though, I think they have to accept that under
Part 15. For example, it'd be illegal for me to jam a local TV
station, but if my amateur radio transceiver (transmitting on a
frequency I'm legally entitled to transmit on) overloads the front end
of my friend's TV and interferes with his reception, that's not
illegal. This is why Part 15 devices often have a message on the back
saying something like, "this device must accept any interference,
including interference that may cause undesired operation."
Of course, it's possible the rules 802.11 is permitted under specify
that the devices cannot cause harmful interference, in which case they
may have a case. Anyone have an 802.11 device that has some relevent
legal boilerplate in the manual?
|
russ
|
|
response 69 of 76:
|
Mar 20 03:25 UTC 2002 |
Re #68: I believe that it is unlawful for a Part 15 service to
interfere with a licensed service, and the Part 15 service must
accept any interference it receives; the licensed service does
not have to. If you want to be certain either way you can go to
the FCC site and read the language itself; it's not nearly as
obscure as most legal verbiage and is not hard to interpret IME.
|
gelinas
|
|
response 70 of 76:
|
Mar 29 04:45 UTC 2002 |
Uhh... I was under the impression that wireless networking was using an
unregulated portion of the spectrum. Specifically, it is the band used by
microwave ovens, heart pacemakers and similar devices.
|
gull
|
|
response 71 of 76:
|
Mar 29 15:04 UTC 2002 |
I think you're talking about the "industrial usage" portion of the
spectrum, used by things like microwave ovens, RF light bulbs, and
police speed radars. Basically it's a dumping ground for all kinds of
things that could generate interference, to keep them away from other
services. I'm not sure if 802.11 devices use those frequencies, but it
wouldn't surprise me; being spread-spectrum they can tolerate a fair
amount of narrowband interference.
It's an unlicensed band, but I don't think it's accurate to say it's
unregulated. There are limits on how much power you can radiate, I
believe, and maybe other things too.
|
krj
|
|
response 72 of 76:
|
Mar 29 15:49 UTC 2002 |
Salon has a recent story reporting that Clear Channel is starting
to get some unwanted attention from the FCC and from the anti-trust
world. The FCC is investigating allegations that Clear Channel is
using shell corporations to conceal its ownership of some radio
stations whose acquisition would be in violation of what feeble
restrictions remain on the concentration of ownership.
Antitrust interest is being piqued by Clear Channel throwing its
weight around in the concert promotion business.
|
other
|
|
response 73 of 76:
|
Mar 29 16:00 UTC 2002 |
My 802.11 device works in the 2.4GHz range. I thought that was the
standard.
|
krj
|
|
response 74 of 76:
|
Mar 29 16:13 UTC 2002 |
Here's a business article on XM satellite radio which gives some
customer numbers:
http://musicdish.com/mag/?id=5575
In a press release on their 10K filing with the SEC, XM says it
had 28,000 subscribers at the end of 2001, and they claim that
makes their system "the fastest selling audio product
introduction in the last 20 years." They say they are on track
for 70,000 subscribers at the end of the first quarter of 2002.
|
gull
|
|
response 75 of 76:
|
Mar 30 01:11 UTC 2002 |
Re #73: That's the industrial usage band, then. My microwave oven claims to
operate on 2450 MHz. (They're quite frequency-unstable, though, so I
doubt that's what you'd see on a frequency counter.)
|
gelinas
|
|
response 76 of 76:
|
Mar 30 04:48 UTC 2002 |
Right; the 2.4GHz (2400MHz) band is "Medical, Science, Technology" and
includes microwaves and pacemakers. That's why the warning signs about
pacemakers are up in places that have microwaves: they really can interfere
with one another, but the pacemaker is the more likely to notice.
|