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OfflineBaby_Hitler
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Transmitting data to a moving vehicle -- Wardriving, basically
    #4156114 - 05/10/05 04:27 AM (12 years, 5 months ago)

I want to set up a box on the side of the road that can transmit at least one hour of audio to a device in a moving vehicle driving down the road within the time that the vehicle will be in range if driving the speed limit.

It would be nice if I could build the reciever that goes into the vehicle for less than $30.

It does not have to fit into a dashboard.

Do we have the technology to do this yet?

I'm thinking about taking over a small town, and I need to know.


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OfflineTheCow
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Re: Transmitting data to a moving vehicle -- Wardriving, basically [Re: Baby_Hitler]
    #4156238 - 05/10/05 05:30 AM (12 years, 5 months ago)

Explain this a little further to me. As an electrical engineer I may be able to help.


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Offlineummikko
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Re: Transmitting data to a moving vehicle -- Wardriving, basically [Re: Baby_Hitler]
    #4156306 - 05/10/05 06:25 AM (12 years, 5 months ago)

Cool idea.

I think the wireless connections you can get for under 30$ are not yet fast enough to transmit that much data in a few seconds(the time the vehicle will be within range).


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Re: Transmitting data to a moving vehicle -- Wardriving, basically [Re: Baby_Hitler]
    #4156940 - 05/10/05 12:19 PM (12 years, 5 months ago)

you need an fm broadcast... which requires a license.


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Offlineivi
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Re: Transmitting data to a moving vehicle -- Wardriving, basically [Re: Baby_Hitler]
    #4157255 - 05/10/05 01:49 PM (12 years, 5 months ago)

Wardriving as I know it basically is an unauthorized access to unsecured (or not so unsecured) wireless networks while driving around in an appropriately equipped vehicle.

I think you should look into pirate broadcasting.

http://www.frn.net/

But what do I know :smirk:


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Edited by ivi (05/10/05 02:06 PM)


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OfflineBaby_Hitler
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Re: Transmitting data to a moving vehicle -- Wardriving, basically [Re: Jim]
    #4157342 - 05/10/05 02:07 PM (12 years, 5 months ago)

No. That would defeat the whole purpose of what I am trying to do.

I'm looking for an alternative to liscensed broadcasting using unliscensed spectrum, such as that used by wireless networking.

Also I'm considering using LED transmitters.


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OfflineBaby_Hitler
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Re: Transmitting data to a moving vehicle -- Wardriving, basically [Re: ivi]
    #4157425 - 05/10/05 02:25 PM (12 years, 5 months ago)

What I am schemeing is sort of like wardriving, except the computer that is the transmitter is set up to intentionally transfer files to another system, which can then play the audio file over the vehicle's stereo system. There would be no free internet access involved, just a few audio files.

They would be mostly (75%) just people talking, which could be highly compressed.

The cars wouldn't nessisarily have to be moving, but it would be nice if they could be.

A specialized antenna would focus the signal on the road, or possibly it could be placed on a back road where people could stop, or slow down to <10 MPH and download files.


Subversive files.


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OfflineBaby_Hitler
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Re: Transmitting data to a moving vehicle -- Wardriving, basically [Re: TheCow]
    #4157444 - 05/10/05 02:31 PM (12 years, 5 months ago)

I'm trying to circumvent the FCC by transmitting audio by unconventional means i.e. 802.11b, LED transmitters, etc...

LEDs could be used to transmit a signal that could be collected by a small telescope with an IR reciever in the eyepiece. It may only be able to transmit at night though. I'm not sure.


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Re: Transmitting data to a moving vehicle -- Wardriving, basically [Re: Baby_Hitler]
    #4157446 - 05/10/05 02:31 PM (12 years, 5 months ago)

This what your looking for ?


http://www.kitz.ozware.com/kits/kf0000.html


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OfflineBaby_Hitler
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Re: Transmitting data to a moving vehicle -- Wardriving, basically [Re: fungusamongus]
    #4157478 - 05/10/05 02:37 PM (12 years, 5 months ago)

Not really. Not unless the FCC has really deregulated the FM spectrum in the last day or two and I didn't hear about it.


I'm looking for something low wattage, and high speed.


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OfflinetrendalM
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Re: Transmitting data to a moving vehicle -- Wardriving, basically [Re: Baby_Hitler]
    #4157481 - 05/10/05 02:38 PM (12 years, 5 months ago)

You would need quite a powerful LED to transmit anything over more than a few tens of feet. A laser-based system would be better if you want to go a few hundred yards or more.

2.4 GHz cordless telephones have good range and run in the same un-licenced band as 802.11 wireless does. They are already set up to transmit voice...so little modification would be required.


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OfflinetrendalM
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Re: Transmitting data to a moving vehicle -- Wardriving, basically [Re: Baby_Hitler]
    #4157487 - 05/10/05 02:39 PM (12 years, 5 months ago)

Yeah, on second thought, go with the 2.4Ghz cordless phones. It's probably the easiest solution to what you are looking for.


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OfflineBaby_Hitler
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Re: Transmitting data to a moving vehicle -- Wardriving, basically [Re: trendal]
    #4157555 - 05/10/05 02:54 PM (12 years, 5 months ago)

Should the audio be digital, or analog?

What would it sound like if I compressed an hour long analog audio signal into a 30 second transmission(120X), and then slowed it down on the reciever side before playback?

Like shit I'm guessing.

I was thinking maybe 10W of LEDs, using an optical telescope to home in on the signal. That scheme would be one way communication only I imagine.


I'll look into the cordless phones. I think you may be right about that being the easiest, and cheapest path.


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Re: Transmitting data to a moving vehicle -- Wardriving, basically [Re: Baby_Hitler]
    #4157593 - 05/10/05 03:04 PM (12 years, 5 months ago)

I think most cordless phones, especially older ones, are analog. You might be able to find a way to modulate the signal with a modem to transmit digitally (and compressed).

I just asked a friend, and he said that some newer 2.4Ghz phones (maybe even most newer ones) use digital transmission, which would make compression MUCH easier.


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InvisibleCalifornia
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Re: Transmitting data to a moving vehicle -- Wardriving, basically [Re: trendal]
    #4157916 - 05/10/05 04:29 PM (12 years, 5 months ago)

Walkie talkies and an audio recorder?


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OfflineBaby_Hitler
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Re: Transmitting data to a moving vehicle -- Wardriving, basically [Re: California]
    #4158240 - 05/10/05 05:56 PM (12 years, 5 months ago)

I was just thinking about those walkie talkies that have like a half mile range. Are those 2.x GHz?


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OfflineBaby_Hitler
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Re: Transmitting data to a moving vehicle -- Wardriving, basically [Re: trendal]
    #4158270 - 05/10/05 06:07 PM (12 years, 5 months ago)

So let's pretend the transmitting/recieving part is going to be a cinch for now. All we need now is recording and playback.

Could we use a VCR to record the signal and play it back 120 times slower without degrading the signal too much?

If the VCR were modified to record 11X faster, and play back 11X slower that would be 112 = 121X faster playback.


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Re: Transmitting data to a moving vehicle -- Wardriving, basically [Re: Baby_Hitler]
    #4158297 - 05/10/05 06:14 PM (12 years, 5 months ago)

I think you would have quite a lot of distortion with trying to record/playback a VHS tape at such different speeds.


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Re: Transmitting data to a moving vehicle -- Wardriving, basically [Re: trendal]
    #4158430 - 05/10/05 06:52 PM (12 years, 5 months ago)

VCR for audio?
This audio data has to be altered?


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OfflineBaby_Hitler
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Re: Transmitting data to a moving vehicle -- Wardriving, basically [Re: trendal]
    #4158561 - 05/10/05 07:26 PM (12 years, 5 months ago)

Can you think of something better?

Oregon: If recording to a VCR tape I am assuming the data is time compressed analog.

The broadcast would be recorded at normal speed , and then broadcast 120X faster. The VCR would record 11X faster, and play back 11X slower.

It might would be easier if the recieving VCR (or whatever) recorded at 1X and played back at 1/120 X . There's got to be a way to use the whole tape, and not just the audio track.


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