No, I'm pretty sure he meant multi path:. Not only will it cause fading, but it will screw up the phase (and group delay) which will muck with the GPS algorithm--giving inaccurate results.
I think there's also some confustion going round about here too. By volume are people meaning volume knob, or SPL? In my earlier statement, I was assuming that the volume knob was constant. I also assumed that the voltage would remain constant if the volume know remained constant. These may not be valid assumptions, and I should've stated them earlier.
Lumen Lab has some good plans and even better forums. I find it to be worth the $20 you have to pay up front. Before you pay, you can check out the projectors people have made in the Project Gallery forum.
The money is used by the fellow who runs the board. He builds projectors, trys different pieces and part out, and most immportantly, gets custom lenses made for their community.
There's a difference between using proper terms and purposly wording something in an unclear (but impressive sounding!) manor. I think this is what they were getting at.
We have a linear waterfowl problem
or
Our ducks aren't in a row
I'd like to see better summaries of research published; something available in between reading all the abstracts and interesting papers in the top journals of the field and just reading the occasional flasgship paper in/Science/ or/Nature/.
For the IEEE, I've found the maganizes published by the individual societies give a good high-level overview of what's in the journals. My favorite is the IEEE Signal Prccessing Magazine.
Of course this probably isn't the area your interest in, and it probalby doesn't help:)
The FCC limits 802.11 power so buying expensive access points isn't going increase your range.
Power isn't the only thing money can buy. It can also buy a receiver with better sensitivity which translates into being able to close a radio link with a weaker signal.
Mostly, it's all about the antennas. In some experimetns I've read about, directional antennas have enabled signals to broadcast and receive across several kilometers (line of site). Check out these guys to see what's available as far as antennas go.
Related to this the FCC regulates EIPR. Effective Isotropic Radiated Power. Using a more directional antenna will increase your EIRP, so that's not really a legal answer. See FCC Title 47, Part 15.247. This does (perhaps incorrectly) assume you live in the US.
This is the part of your request that you're going to have a bit of trouble with. RF energy is a bit like water: it goes where it wants.
Sure, if you were spraying water instead of RF energy, you could put a different nozzle on the hose to change the spray pattern, change the flow rate to control how far you spray, dig ditches to direct the water, etc.
With the RF all you can do is put a different nozzle (antenna) on the hose (access point) and adjust the flow rate (power output). Unfortunatly there are no easy ditches to dig for e-mag waves!
The above only considers one approach to keeping your neighbors off of your network, which I assume is your end goal really. There are lots of other options that I don't know as much about. Things like WPA and captive portals.
I'm leery about the system they're showing, if they aren't ready to discuss bandwidth per customer and total numbers of simultaneous connections, etc.
I was just wondering about the same thing. That's a pretty big area to try and cover with just one Stratellite (or whatever you want to call it). That would be kind of like putting everyone in that area on the same subnet. There's only so many frequencies and so much bandwidth, and all of those people will have to share. Doesn't seem like a very good solution for wireless broadband everywhere.
isn't going to work. Since each sound card will have a slightly different version of 44.1-kHz, none of the rooms will match. It won't take long for the songs to get out of sync.
Ethernet is also no isochronous, meaning it can't gaurantee the arrival time of packets...
Re:as longas we're stcuck with stingy ISP
on
TiVo to Go Released
·
· Score: 1
I don't think we'd be asking the copper for anything! If anything changed, it would be how the total bandwidth is split among up and down stream.
You see, there is a total amount of bandwidth that a particular piece of wire, channel, whatever can handle. That total amount is split using some sort of multiplexing scheme (frequency, time, or something more complicated). xDSL and cable are split with a heavy bias on down stream because that's what most people need/want.
It's not like your 3Mbps cable line can support that full duplex and the cable provider arbitrarily set an up cap at 128kbps. If they set up and down equaly, you'd have something like 1.5Mbps (and change) up and down.
Man this is off topic!
Brett
Slashdot Mirror
No, I'm pretty sure he meant multi path:. Not only will it cause fading, but it will screw up the phase (and group delay) which will muck with the GPS algorithm--giving inaccurate results.
Brett
I know I could use an emulator such as Wine
WINE is an acronym for Wine Is Not an Emulator.
Brett
Have you tried calling your card company?
Brett
That won't work!
First of all, it's almost all graduate level. There's just 3 undergraduate courses in CS. It sounds like she's not ready for a graduate program. Yet.
Second of all, you must work for a company that belongs to their Honors Coperative Program (HCP), which chances are, she does not.
It's also very expensive, but that's beside the point.
Brett
when she walks in and sees that!
Oh, wait! It's Saturday night and I'm posting on slashdot...
Brett
I'm reminded of the story about the music student who asked his teacher for help in writing a symphony.
the teacher responded, "you're too young to write a symphony."
the student had a ready answer: "Mozart wrote a symphony at 6".
the teacher, too, had a ready reply: "yes; but, Mozart didn't have to ask."
Brett
Agreed!
I think there's also some confustion going round about here too. By volume are people meaning volume knob, or SPL? In my earlier statement, I was assuming that the volume knob was constant. I also assumed that the voltage would remain constant if the volume know remained constant. These may not be valid assumptions, and I should've stated them earlier.
Brett
Probably don't have to explain this on /., but lower ohms = lower resistance = less power.
Wrong. Lower resistance = more current = HIGHER power:
P=V*I
I=V/R
plug the second into the first:
P=V^2/R.
The output voltage will probably remain roughly constant. Decreasing R will INCREASE the power.
Brett
Lumen Lab has some good plans and even better forums. I find it to be worth the $20 you have to pay up front. Before you pay, you can check out the projectors people have made in the Project Gallery forum.
The money is used by the fellow who runs the board. He builds projectors, trys different pieces and part out, and most immportantly, gets custom lenses made for their community.
Hope this helps,
Brett
There's a difference between using proper terms and purposly wording something in an unclear (but impressive sounding!) manor. I think this is what they were getting at.
We have a linear waterfowl problem
or
Our ducks aren't in a row
Brett
I'd like to see better summaries of research published; something available in between reading all the abstracts and interesting papers in the top journals of the field and just reading the occasional flasgship paper in /Science/ or /Nature/.
:)
For the IEEE, I've found the maganizes published by the individual societies give a good high-level overview of what's in the journals. My favorite is the IEEE Signal Prccessing Magazine.
Of course this probably isn't the area your interest in, and it probalby doesn't help
Brett
Like uh-duh, use a static mat!
My cell phone is about as small as it can get and still have a useful interface
I bet it could be thinner with out sacrificing usefullness.
Brett
This is from Israel. Israel is not in Africa, it is in Asia. Please see a map for further details.
The FCC limits 802.11 power so buying expensive access points isn't going increase your range.
Power isn't the only thing money can buy. It can also buy a receiver with better sensitivity which translates into being able to close a radio link with a weaker signal.
Mostly, it's all about the antennas. In some experimetns I've read about, directional antennas have enabled signals to broadcast and receive across several kilometers (line of site). Check out these guys to see what's available as far as antennas go.
Related to this the FCC regulates EIPR. Effective Isotropic Radiated Power. Using a more directional antenna will increase your EIRP, so that's not really a legal answer. See FCC Title 47, Part 15.247. This does (perhaps incorrectly) assume you live in the US.
without blanketing the entire neighborhood
This is the part of your request that you're going to have a bit of trouble with. RF energy is a bit like water: it goes where it wants.
Sure, if you were spraying water instead of RF energy, you could put a different nozzle on the hose to change the spray pattern, change the flow rate to control how far you spray, dig ditches to direct the water, etc.
With the RF all you can do is put a different nozzle (antenna) on the hose (access point) and adjust the flow rate (power output). Unfortunatly there are no easy ditches to dig for e-mag waves!
The above only considers one approach to keeping your neighbors off of your network, which I assume is your end goal really. There are lots of other options that I don't know as much about. Things like WPA and captive portals.
Hope this hepls some,
Brett
I'm leery about the system they're showing, if they aren't ready to discuss bandwidth per customer and total numbers of simultaneous connections, etc.
I was just wondering about the same thing. That's a pretty big area to try and cover with just one Stratellite (or whatever you want to call it). That would be kind of like putting everyone in that area on the same subnet. There's only so many frequencies and so much bandwidth, and all of those people will have to share. Doesn't seem like a very good solution for wireless broadband everywhere.
That was not all: See also: http://www.army.mil/fcs/
That is all.
isn't going to work. Since each sound card will have a slightly different version of 44.1-kHz, none of the rooms will match. It won't take long for the songs to get out of sync. Ethernet is also no isochronous, meaning it can't gaurantee the arrival time of packets...
How about: http://www.apple.com/remotedesktop/
I don't think we'd be asking the copper for anything! If anything changed, it would be how the total bandwidth is split among up and down stream. You see, there is a total amount of bandwidth that a particular piece of wire, channel, whatever can handle. That total amount is split using some sort of multiplexing scheme (frequency, time, or something more complicated). xDSL and cable are split with a heavy bias on down stream because that's what most people need/want. It's not like your 3Mbps cable line can support that full duplex and the cable provider arbitrarily set an up cap at 128kbps. If they set up and down equaly, you'd have something like 1.5Mbps (and change) up and down. Man this is off topic! Brett
How about a firewire DVD drive? Have your cake and eat it too!