Hello, I am installing a video security system at the business where I work. The cameras are mounted in enclosures recessed into the ceiling. I have minimal access to the video output cable on the camera when the camera is mounted in the enclosure.
This makes it sort of difficult to position the camera, set the zoom, and adjust the focus--I can't connect a local video monitor to allow me to see what the camera is actually viewing. In order to solve this problem, I have decided to buy a video transmitter and connect this to the output of my video switcher in the electronics room (quite a distance from the many cameras). I would then mount the transmitter out in the main building amid the cameras. I would then carry a receiver and portable video monitor to use for camera adjustments. I wouldn't use it very much--maybe a few hours every few months. There are walls inside the building that the signal would need to penetrate plus it would need to penetrate the roof for adjustment of outdoor parking lot cameras.
The question I have relates to the video transmitter/receiver link: I have found on eBay, and Froogle transmitter/receiver pairs that appear to be made in China. I have read that these units are probably illegal (too much power) to use in the US without a license. I have also read that they are cheaply made and that they may stray outside their frequency bands. I don't know anything about these items-maybe someone has had some direct experience with them. Maybe someone has another suggestion for a transmitter/receiver pair.
I really don't know how much transmitter power I would need to access all the areas of my building. The building is 150 ft by 150 ft with concrete tilt up walls on the four sides. The internal walls are constructed using 2x4s with sheet rock covering. There is lots of fluorescent lighting throughout the building.
I have been thinking about using a 1.2 GHz transmitter/receiver pair. This seems like a good frequency since it won't conflict with 2.4 GHz portable phones, and WiFi. Does this seem like a good choice?
My intent here is to be legal though not fanatical. I do understand that amateur licenses are not too difficult to get (I do have an EE degree but I never studied radio transmission-though I am interested). If I did get a license, I could operate more powerful transmitters-though it is hard for me to know if this is overkill.
Some suggestions from knowledgeable individuals would be appreciated.
Thanks, Greg Laird