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wireless transmission

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govardhan

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can i wirelessly transmit power through satellite just by simply using A/D & D/A converters on the transmitter & receiver side respectively ?????
 
He's asking if he can use an ADC+transmitter to transmit the value of a 24V source, and then take a receiver+DAC that will reproduce the 24V on the other to power something else.

The answer is no you cannot. You are only transmitting information. The receiver uses it's own power source to reconstruct and output the data it receives from the transmitter. It does not use the transmitter's RF energy to do this becuase not enough is received in the antenna to power the receiver+DAC.

If you are asking this question you REALLY REALLY need to do some studying because it's should be very very obvious why this does not work, even for completely new beginners.

However, it should be said that it's not impossible, is is just completely impractical. For this to work, the RF energy received by the antenna (which means even more energy has to be sent by the transmitter) has to be enough to power the receiver+DAC and still have power to spare so the DAC can power something else. This would require an antenna so powerful it could blast holes in walls, planes out of the sky, and satellites out of orbit. Also, if you did not use a directional antenna, it would take even more energy and instead of blasting something in a particular direction it would just destroy everything around it (it's like the difference between a laser weapon that burns anything you shoot it at, and a lightbulb powerful enough to burn everything around it).

Also, you would not use a DAC. A DAC converts one form of data (digital information) to another form of data (analog signal). A DAC also uses it's own local power source to do it's job and does not power other things with it's output signal. If you were transmitting and receiving power, you would take the RF energy directly from the antenna. Something that would regular the energy flowing between this antenna and the load would be called an inverter or regulator, not a DAC. DACs are designed to produce a voltage or current signal containing information and is too weak to power something. Inverters and regulators are designed to control the voltage or current that is powering something else and are built completely differently because they need to be high power and efficient.

But it's much easier and safer just to aim a really powerful laser at a solar panel optimized to use that laser, but this is still very very very inefficient which is why it is only used in a couple of research projects (like NASA) and the lasers used are powerful enough to be used as weapons. You also still need a clear view of the object and if you have that, wires usually work betters anyways.
 
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See DK's post above. Forget about it...
 
can i convert RF into an AC signal ??

This is what an antenna does. But you won't be able to power anything with the RF energy.

Antennas are too inefficient to send/receive enough energy to transfer anything more than information.

It would be like using wooden wires to conduct electricity.
 
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This is what an antenna does. But you won't be able to power anything with the RF energy.

Antennas are too inefficient to send/receive enough energy to transfer anything more than information.

It would be like using wooden wires to conduct electricity.

Now, he can`t. But in future, he maybe can do this..
Watch discovery channel :).
 
He's asking if he can use an ADC+transmitter to transmit the value of a 24V source, and then take a receiver+DAC that will reproduce the 24V on the other to power something else.

The answer is no you cannot. You are only transmitting information. The receiver uses it's own power source to reconstruct and output the data it receives from the transmitter. It does not use the transmitter's RF energy to do this becuase not enough is received in the antenna to power the receiver+DAC.

If you are asking this question you REALLY REALLY need to do some studying because it's should be very very obvious why this does not work, even for completely new beginners.

However, it should be said that it's not impossible, is is just completely impractical. For this to work, the RF energy received by the antenna (which means even more energy has to be sent by the transmitter) has to be enough to power the receiver+DAC and still have power to spare so the DAC can power something else. This would require an antenna so powerful it could blast holes in walls, planes out of the sky, and satellites out of orbit. Also, if you did not use a directional antenna, it would take even more energy and instead of blasting something in a particular direction it would just destroy everything around it (it's like the difference between a laser weapon that burns anything you shoot it at, and a lightbulb powerful enough to burn everything around it).

Also, you would not use a DAC. A DAC converts one form of data (digital information) to another form of data (analog signal). A DAC also uses it's own local power source to do it's job and does not power other things with it's output signal. If you were transmitting and receiving power, you would take the RF energy directly from the antenna. Something that would regular the energy flowing between this antenna and the load would be called an inverter or regulator, not a DAC. DACs are designed to produce a voltage or current signal containing information and is too weak to power something. Inverters and regulators are designed to control the voltage or current that is powering something else and are built completely differently because they need to be high power and efficient.

But it's much easier and safer just to aim a really powerful laser at a solar panel optimized to use that laser, but this is still very very very inefficient which is why it is only used in a couple of research projects (like NASA) and the lasers used are powerful enough to be used as weapons. You also still need a clear view of the object and if you have that, wires usually work betters anyways.

You should never tell someone that something "should be obvious", as if it were, he wouldn't be asking it. I personally don't find this as something obvious to someone new to electronics.
 
can i wirelessly transmit power through satellite just by simply using A/D & D/A converters on the transmitter & receiver side respectively ?????

This as your first question is no.

Your second question is somewhat leading. Televisions do this with a tuner all the time. Converting it wireless into raw power sounds like a question for another forum.

But, dknuyen answered it correctly.

(Alternative Energy) is the correct forum for this question.

Have fun there really is lots of info here. You can search to your hearts content.

Those who know the most will be able to help you if your in the right forum and are asking questions which are relevant and clear to them.

Don't be surprised if they dig into you to get it.

Good luck.

kv
 
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