Non-2.4GHz video transmitter

[i336]

Hi there!

I have RF sickness, which is rather undocumented, but it basically means that I have to almost over-severely limit my time near "hi-tech" stuff - I'm not sure why but I think it has something to do with the high frequencies. I can use the computer, but not too often - every couple of weeks for an hour here and there - and I have a CRT TV which I'm fine with, so it isn't (thankfully) a complete no-go policy for technology. I can't handle set-top boxes though, which will be interesting once Australia switches the analog signal off come 2015!!

Anyway, since I'm getting a (33MHz ) RC helicopter for... well, just look at the calendar I just wanted to ask how complex it'd be to construct a non-2.4- or 5.8GHz composite video transmitter (and mono audio, if that wouldn't be hard) for it? It's a Twister Bell Medevac heli so it's reasonably large and should be able to handle a bit of weight, but I wouldn't push it. I also don't want something that needs 10 Amps to transmit; I would like to actually fly it for its rated amount of time. Speaking of transmission characteristics I'd actually like to make it 1) not too strong 2) have two channels and 3) have variable output power. That'd be great

I thought of sticking an antenna amplifier on an RF modulator...?

Looking forward to your responses!

i336

 

[Robb]

Get an LCD monitor. MUCH easier on the eyes and less radiation. I felt a lot better ever since I began to use one - BTW . . .

I'm GLAD I finally got rid of my CRT.

 

[T23]

I used to have about 10 of those things I now have a large LCD HDTV I use as a computer monitor, a CRT looks pitiful next to it...:w00t:

T23

 

[i336]

Slightly OT, but LCD etc displays radiate high frequency radiation because of all the digital decoding circuitry

A CRT operates at a few kHz by comparison, and receives an analog signal at that, so yes, it does tire me out, but not as badly as a digital TV would.

Back on topic , I forgot to mention in my original post... that I want my transmitter to be as low-frequency as possible! I'm aware that TV starts at ~40MHz; I would like to start here, if possible, although I don't specifically need a system capable of being received directly on a TV, ie without a specialized receiver. I just want it as low-frequency as possible.

If anyone has any ideas as to other forums or places I might try that would be welcome.

i336

 

[T23]

This may not be the best idea but why not modify a 49MHZ baby monitor to send an analog video signal?


T23

 

[i336]

Wow, would that work? Video through... a baby monitor. I am learning how much I don't know about radio. :blink:

So... how would that work? Camera/audio > RF modulator > baby monitor transmitter? And then receiver ...> TV, I hope (ie not displaying on some custom piece of hardware)?

Also, ideas for an inexpensive non-TFT-or-otherwise-flat "portable" video monitor would be cool, so then I could watch what I was doing when, say, in a park, as opposed to being tethered to the TV at home.

And if anyone knows of any ideas on how I might amplify both the signal from my transmitter so the heli can hear it from outside the house - perhaps by splicing it into the TV aerial feed? - and boosting either the baby monitor signal, or the receiver, so the video can come back to the house, would be great. Then I can go outside and people will think I have an autonomous helicopter, when I'm just flying it from the TV (Video games I can play, anyone?)

i336