[opendtv] Re: WiFi Supplanting Broadcasting? Get Real!
- From: "John Willkie" <jmwillkie@xxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 13 May 2004 19:58:36 -0700
Great to hear it, Ralph. How many other users of the same spectrum were
positioned between the points?
John Willkie
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx
[mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Ralph P. Manfredo
Sent: Thursday, May 13, 2004 5:17 PM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: WiFi Supplanting Broadcasting? Get Real!
As I remember from my days in the 802.11 days, FCC Part 15.247 allows a
maximum of 1 watt of transmit power into a unity gain antenna. With that
power, we could get about 1 - 3 km outdoors with no problem. However, FCC
Part 15.247 also allows for an omnidirectional antenna maximum of 6dB gain.
Using the 1 watt transmitter with an omnidirectional antenna with 6dB of
gain, I was able to reliably transmit to a receiver approximately 7 miles
away in Jackson Hole. This was with a frequency hopping system operating in
the 2400-2483.5 MHz. At another company, we used higher gain antennas and
transmitted from shore to oil drilling platforms in the Gulf of Mexico with
five 9s reliability. The key here was to get the antennas high enough to
have a clear line of sight to each platform. In Alaska, we were able to
transmit with the same system approximately 45 miles. The key here was we
used directional antennas and we did not interfere with any other users.
This was all legal per the FCC.
Ralph
Ralph P. Manfredo
President & CEO
rmanfredo@xxxxxxxx
************************************************************************
BroadBand Networks Corporation
2530 Berryessa Road, No. 237
San Jose, CA 95050
Phone: 408.988.2060
Fax: 408.988.2188
www.bbnc.com
Leaders in MPEG-2 and MPEG-4 video over ATM and IP Networks
************************************************************************
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] On
Behalf Of John Willkie
Sent: Thursday, May 13, 2004 2:03 PM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: WiFi Supplanting Broadcasting? Get Real!
Do you think that the antenna will solve all problems? Rayleighian and
Gaussian fading?
I would note that if they are not now stating that they have a 3.5 km range,
then they probably will not have a 3.5 km range.
Are these frequencies free from interference? How well does WiFi work when
you have a radio diathermy unit in operation (the original, and once, sole
"use" of these frequencies)?
I can still find a whole lot of areas within the grade B contours of San
Diego TV stations where there are no humans or houses for 2.5 miles, and I'd
like to know how to bridge them wirelessly.
Redundancy?
Througput delay?
Could you hold a contest and know that everybody is receiving the prompt to
call within 200 ms of one another?
And, are those antennae legal in the U.S. or Canada? I tend to doubt the
former is the case.
My experience with WiFi was that I could not connect three houses, with the
base station in the middle one, and the two wings within 75 feet of the
base. Three antennae might have helped, but that would have required room
modifications and lead in cables. I did pick up some other signals: they
must have been from the houses on the street above, but even that was VERY
fluky.
I believe the culprit is the "chicken wire" that was once exclusively used
to provide support for the stucco (painted external plaster) that makes up
most outside walls in Southern California.
Also, what about Emergency Action Notification (he says as test is heard on
the tv set behind him?
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx
[mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of John Golitsis
Sent: Thursday, May 13, 2004 12:15 PM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: WiFi Supplanting Broadcasting? Get Real!
That's with the standard stub antennas that the consumer APs ship with.
Check
out some of these optional units:
http://www.d-link.com/products/antennas.asp
I thought they used to list range in the specs, but they don't seem to now,
at
least. I'm pretty sure I recall one of the models having a 3.5KM range.
Definitely not 30 miles, but not a few hundred feet, either.
----- Original Message -----
From: "John Willkie" <jmwillkie@xxxxxxx>
>
> It would be hard to replicate broadcast service area because the Wi-Fi
> signals only travel a few hundred feet -- if that. We had viewers 30
miles
> away, with many areas between them and my transmitter where there were no
> homes, businesses, or even telephones per square mile.
----------------------------------------------------------------------
You can UNSUBSCRIBE from the OpenDTV list in two ways:
- Using the UNSUBSCRIBE command in your user configuration settings at
FreeLists.org
- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
unsubscribe in the subject line.
----------------------------------------------------------------------
You can UNSUBSCRIBE from the OpenDTV list in two ways:
- Using the UNSUBSCRIBE command in your user configuration settings at
FreeLists.org
- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
unsubscribe in the subject line.
----------------------------------------------------------------------
You can UNSUBSCRIBE from the OpenDTV list in two ways:
- Using the UNSUBSCRIBE command in your user configuration settings at
FreeLists.org
- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
unsubscribe in the subject line.
----------------------------------------------------------------------
You can UNSUBSCRIBE from the OpenDTV list in two ways:
- Using the UNSUBSCRIBE command in your user configuration settings at
FreeLists.org
- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
unsubscribe in the subject line.
Other related posts:
