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What is the frequency of signals at VGA port of CPU? Answered

I want to connect my computer  monitor and CPU by wireless.I have to amplify the signals at VGA port of CPU and transmit in air so that the receiver  circuit connected to monitor  VGA port could receive the transmitted signals.In order to amplify signals at VGA port of CPU i need to design amplifier using transistors.For designing amplifier i need to know the frequency of signals at VGA port of CPU

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Downunder35m

Best Answer 2 years ago

No offense but:
a) You can't get VGA signals from a CPU.
b) You can't simply take a VGA signal and transmit it wireless as you need multiple signals or mix them first into a single one.

If this would be in any way feasable you can be sure someone in China would have sold it already ;)

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Rajkumar2506Downunder35m

Answer 2 years ago

iam going to use encoder at transmitter to combine the signals into 3.These three signals is going to be transmitted and at the receiver i will decode the 3 signals and get my original VGA signals

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Downunder35mRajkumar2506

Answer 2 years ago

Red,green,blue,horizontal sync,vertical sync - makes 5 signals on my end.
You are looking at a pixel clock frequency of around 25MHz and a horizontal frequenzy of around 30kHz.
For obvious reasons all this needs to be timed for every single pixel to get a picture.
The vertical sync uses a negative signal while everything else uses a positive - I don't know where you got the idea of AC signals...

The frequencies are also subject to the display driver in use, resolution and refresh rate.
Either you missed the point entirely or you know things noone else knows in terms of available bandwidth and channels for the digital transmission of siglans using radio waves....

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rickharris

2 years ago


Good luck with that - I look forward to the posted instructable (or not)

Just for the record every PC or computer I have seen bar a couple of historic machines only have binary digital signals at the CPU. That is DC and on or off.

They send digital data defining position, colour and on off state to then graphics card which makes the image for the screen.

At the graphics card it is still digital - If you want a composite video signal you need to use a converter.

I guess it is just possible you may know better.

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iceng

2 years ago

The VGA signals frequency is the raster scan rate for the vacuum electron beam that activates the phosphor that forms the picture you see on the tube.

The raster scan rate is different for Europe and the USA.

https://en.wikipedia.org/wiki/Raster_scan

https://www.google.com/search?q=diy+vga+signal+gen...

To send (transmit) VGA signals you will need to modulate them with RF at the source like any radioand demodulate them at the receiving radio end to send the original signal to the monitor or tv of your choice...

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Rajkumar2506iceng

Answer 2 years ago

Signals at VGA port is an AC signal.VGA signals can't be a DC signal.All the AC signals can propogate in air when they are amplified to reach the receiver.Then why i need to modulate the signal with RF frequency.Also modulating signals at RF frequency is very difficult.

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icengRajkumar2506

Answer 2 years ago

How big of an antenna will you use to propagate a vga signal, how far, how will you block 50 Hz hum ?

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Rajkumar2506iceng

Answer 2 years ago

just a simple antenna that is used in radio receivers.I plan to propagate upto 5 meters.To block 50Hz i will use bandpass filter