WIRELESS CAMERAS!
LOS Line of Sight Propogation
Line-of-Sight (LOS) Range refers to the ideal broadcast range of wireless audio/video link (transmitter and receiver) systems. Line-of-sight means the range when there is a visible pathway between the transmitter antenna and the receiver antenna. Additionally, the Line-of-Sight specification indicates performance outdoor transmission distance of a wireless camera under absolute best conditions: (no walls, trees, or any obstructions). In other words, there is nothing between the transmitter and receiver, for example building top to building top.
FREQUENCY
Most cameras operate on a 2.4 GHz frequency, as do cordless phones. There are three other frequencies: 2.4 GHz, 1.2 GHz, 900 MHz, 5.8 GHz, each with their own unique specifications.
L BAND (1240MHz - 1300MHz) 950MHz CAMERAS
S BAND (2 - 4 GHz) 2.4GHz CAMERAS
C BAND (4 - 8 GHz) 5.8GHz CAMERAS
Ch1 = 2.413 GHz, Ch2 = 2.432 GHz, CH3 = 2.451 GHz, CH4 = 2.470 GHz
Wi Spy 2.4 ANALYZER!
Chanalyzer 3.0 for Wi-Spy 2.4x
CYWUSB6935
IDWARF
First you will take a receiver and you will need to make sure that it is on the same "channel" as the camera.
Look at the camera. There should be a sticker or something that says 1, or 2, or 3, or 4. If it has a punch through the number, or a check mark on it then that is the channel that you will set the receiver too.
If you cannot tell what channel the camera is on then put the camera next to the receiver, and go through the channels until you see the video.
The yellow connector (USA composite) is the video out. Connect an RCA cable to the yellow connector. On the other end you will have to get an RCA to BNC adapter. The adapter goes on the DVR camera input, and the RCA cable plugs in to the adapter.
Note: Some receivers will lose the channel setting when the power goes out, and you will have to manually reset the channel back to the one that you need to make it operate. You may want to have it on a battery back up to avoid short term power loss situations.
Note: In the USA the 2.4 GHz frequency is the same frequency used with wireless internet 802.11. You may have to change the wireless router to a different "channel" to avoid interference.
Note: The distance on the package of a wireless cam is for direct line of sight from receiver, and the camera antenna. In other words if you penetrate a wall with the receiver on one side, and the camera on the other then you will have to move them closer together in order to keep the energy level up so that the receiver can see the camera video.
I cut the package distance in half when selecting a camera. If it says 300 feet (USA) then use it only good for 150 feet.
If you need 400 feet for your project then you will want to select a wireless camera that has 1000 feet line of sight.
The more walls that you penetrate then the closer you will have to get the camera, and the receiver to make it work.
Here is a trick. Put the receiver on the most outer wall, and run wiring back to the DVR. The outside camera will give the receiver the best signal, and make your system trouble free.
In the USA the highest wattage that you can use without a license is one watt. If you go over one watt then you are in violation of FCC Rules, or you need to get a license to operate that "radio".
You can use low wattage systems with no problems. Use directional antennas that point at each other to give you direct line of sight, and you get a better signal output compared to an omnidirectional antennas. Also raise the antennas over treelines, and rooftops to get better reception!
Good Luck!
MICROWAVE OVEN
CHANNEL 9 802.11b
BEACON CARRIER FROM A 2.4GHz PHONE
SUDDEN BURST OF TRAFFIC FROM A BLUETOOTH DONGLE
PRODUCTS:
SWANN WIRELESS CAMERAS
PATCH ANTENNA
YAGI ANTENNA
ANTENNA WIZARD