PERFORMANCE EVALUATION OF THE ACE-1 CABLE EXTENDER
PERFORMANCE EVALUATION OF THE ACE-1 AUTOMATIC CABLE EXTENDER
This performance evaluation curve shows the quality of the picture that can be expected after traversing various lengths of RG59U coaxial cable from a “650-Line quality” Camera. Picture quality degrades with the length of cable unless frequency response compensation is provided. The ACE-1 automatically provides this necessary compensation. The graph compares the length of RG59/U cable in feet to the loss that is incurred by a video picture traversing that cable. The lower curve on the chart depicts the actual loss of picture quality on coaxial cable. The longer the coaxial cable is, the greater the loss in picture quality. On a given length of cable, a high quality camera will suffer a greater percentage quality loss than a low quality camera. That is why a low quality camera will lose very little picture quality on a short length of cable while a high quality camera will suffer significant loss of quality over the same length of cable. Of course a lower picture quality camera will display a lower quality picture at all cable lengths.
That is why high quality cameras cannot deliver a high quality picture on long coaxial cable lengths without the ACE-1 equipment at the Recorder location. Note that from the RG59/U cable loss curve, even at 200 feet of RG59/U cable will result in loss of fully 26% of the picture quality from a “650 line” camera before the picture gets to the Recorder on a system without the ACE-1 at the receiving location.
With the ACE-1 installed at the Recorder location, the picture at the recorder will exhibit the same quality level at the Recorder that the Camera is able to deliver, no matter how long the connecting coaxial cable is, up to 5,500 feet. The upper curve on the chart shows that the ACE-1 will deliver 100% of the picture quality that any given Camera can produce at any length of coaxial cable up to 5,500 feet between the Camera and the Recorder location. An examination of the coaxial cable loss curve shows that even at 100 feet, already 15% of the picture detail is lost. At 200 feet of cable, 26% of the picture detail is lost, and at 300 feet, a 650 Line Resolution Camera can only deliver only 65% of the 650 “lines” or about “553 of the lines of resolution” in the original picture.
The ACE-1 automatic Cable Extender is connected at the Monitor End of the cable to cancel all losses associated with the coaxial cable. All connected cable lengths regardless of length will become completely transparent and thus have zero loss at any length up to 5,500 feet of RG59/U coaxial cable. Any coaxial cable connected to the ACE-1 at the Monitor End of the cable will cause the picture from that Camera to be as bright and crystal clear as a “bench test” with zero length of cable. This will enable switching systems to deliver bright, clear pictures on all the Cameras connected to a switching system no matter how far away the Cameras are located within these distance limits.
The ACE-1 will also eliminate all forms of 60Hz ground loop and high frequency interference from locally radiated RF Radio and Television sources as well as radiated interference from “square-wave UPS” Uninterruptible Power Supplies.
Because the ACE-1 is fully automatic, there is no need to make adjustments when setting up this unit in the field. The ACE-1 provides significant reduction in cross-talk and other interfering signals while automatically adjusting the Video Picture Brightness, Color Fidelity, and Picture Detail to restore the original picture quality content. An internal clamping system also restores the original DC component to the signal so that brightness levels will not vary with picture content due to loss of low frequency content when the dc component is lost.
With an ACE-1 installed at the Recorder location, the picture at the Recorder will exhibit the same quality level at the Recorder that the Camera is able to deliver, no matter how long the coaxial cable is, up to 5,500 feet. The upper curve on the chart shows that the ACE-1, when connected at the recorder location will deliver 100% of the picture quality that any given camera can produce at any length of coaxial cable up to 5,500 feet between the Camera and the Recorder location. This enables the ACE-1, connected to RG59/U to deliver picture detail on long cables that was previously only possible using much higher cost Fiber-Optic transmission systems.
With the compensation provided by the ACE-1, 100% of the picture detail will reach the Recorder on RG59/U coaxial cable for distances up to 5500 feet, which is well in excess of one mile between the camera and the Recoreder location.