Overview

            The Wireless Surveillance System (WSS800) is a device which transmits a video and audio signal (AV signal), then receives the signal to be displayed in another area without the use of wires. It will be used to set up a camera in a remote location and viewed in a different area. The description will go over the overall and detailed system.

Design

            Figure 1 is the overall system block diagram showing the different inputs and outputs. The origin will be a camera and that signal will be transmitted. The resonant frequency is 2.4 GHz. Then signal will be received and carried the signal to the destination a television set.

In Figure 2, the components which will make up the system are listed. The signal from the camera is raw signal and needs to modulated and amplified. The video signal will be at 61.3 MHz and the audio is 4.5 MHz away at 65.8 MHz. The signal will be up converted using a mixer to take the signal up to 2.4 GHz. The Voltage Controlled Oscillator (VCO) will control what the transmitter frequency will be. After the mixer, there will be a 2.4 GHz Band Pass Filter. Following will be a power amplifier. This amplifier specification are adjusted to what distances the device will be used at. Finally will be the transmitting antenna. They will be aperture coupled square patch antennas.

The receiving system will start with the receiving antenna which is identical to the transmitting one. Next is a low noise amplifier. Following is the down converter which uses the same mixer and VCO but the orientation will be slightly different. Then a 70 MHz BPF will be in place. Finally, another amplifier and the television will finish the receiving system.

Figure 1

Overall system block diagram

Figure 2

Detailed system block diagram