Or how to install on the craddle a video camera with a video transmitter, and get on the ground a video receiver and a nice viewing.
A video link needs:
an aboard camera or a video output
an emitter/receiver video system
a screen for viewing
All must work on batteries.

example of emitter 2,4GHz, 4 channels



The camera:

First, an image must be get:
  • Either with a mini video camera. There are many kinds, B&W, color. Prices from 40 to 150 euros; the output is PAL or NTSC depending where you purchase it.
  • Either with a digital camera, or a camcorder, equipped with an analogic video output. Not all have it!
The emitting/receiving system
Then image must be transmitted with an emittor and a receiver. the input of the emittor is linked to the camera video output. there are two kinds of video transmission: as UHF, or in GHz.
In UHF/VHF only the emitter is specific.
The receiver is only a normal TV set for hertz signals. The range is often limited to a few hundreds meters. Equipment can be purchased for a hundred Euros.
I don't have experience on the equipment to-day on the market.
Having used this system for a while some years ago, I finally abandonned it when the TV-walkman I was using as receiver went out. The most inconvenience was to be obliged to re-adjust the frequency each times a near TV broadcasting emitter was covering the same frequency than the one already set.
In GigaHz,The equipment consists of an emitter and a receiver. The transmission range is of several hundreds meters, even more for the most powerful ones.
Prices are also higher, over 200 euros.
It is the transmission system the most reliable.
The receiver is linked to a viewing equipment which have a video input PAL or NTSC: TV set, video-screen, camcorder, DVD reader. The most convenient viewer that I know is a camcorder viewer, recovered on an old one.