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Re: Wireless signal

From: Doug Sutherland <>
Date: Sat, 12 May 2001 16:37:40 +0000

Stewart,

> sending a wireless svga signal ...

As Bryan mentioned, band width is an issue with wireless VGA or SVGA. 
I looked all over for a wireless VGA system, couldn't find it anywhere. 
There are lots of wireless NTSC systems out there, small too. Check out 
this picture of my wireless audio/video transmitter:

http://home.earthlink.net/~wearable/transmitter.jpg
http://64.132.25.173/servlet/cat/product/AVX900-MINI-A.html

The transmitter is about 1 x 0.7 x 0.2 inches and weighs almost nothing. 
This is 900 Mhz FM. Someone mentioned wavecom, I have used those also, 
but they are 2.4 Ghz and interfere with my 2.4Ghz wireless ethernet. I 
can plug the PCM-5822 TV out and audio ports into this and transmit 
both audio and video across the room. I have it displaying on a 13 inch 
TV and feeding into my satellite speaker/subwoofer system. The TV image 
looks fine as far as  NTSC resolution goes (same as wired connection), 
but its still not good for text. It makes a great slide presentation 
tool though, I can switch slides with my IR remote and display on the 
TV with no wires. The receiver is not small or low power though, so 
this is not appropriate for wearables to receive wireless A/V, only 
transmit. 

As far as integration into wearable goes, the transmiter runs on 9 
volts, so I'd need another regulator. Those big connectors could be 
chopped off and wired into the system, but here's where things get 
complicated. This goes back to my old quest for software switchable 
audio and video inputs and outputs. I don't want to have to manually 
switch cables. Ideally I'd like to be able to switch the power to 
this transmitter with relay, and also switch the audio and video 
via software command. Using the same technique I would also switch 
between other audio/video sources,  dynamically connecting to cell 
phone audio ports, switching the CPU audio to headphones, external 
speakers, wireless tranmitter etc. Eventually I want to create a 
circuit to do this switching. There is one here but its way too big:

http://www.controlanything.com/html/asel.htm

If anyone has any circuit designs or ideas for small audio/video 
switcher, please let me know. I need to do the same thing as this 
ASEL switcher in much smaller places.

Lots of cool stuff at supercircuits, check out these:
http://208.21.248.203/subject/covert_video.html
http://www.supercircuits.com/start_wireless.html

  -- Doug 

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