Specifications

Even greater distances of 8000' or even 12000' can be equalized by adding
intermediate "booster" amplifiers and equalizers. These cable equalizer/amplifiers
are made by a variety of manufacturers, and when included in CCTV system
designs can completely offset the cable or twisted pair loss so that the resultant
"Lines" delivered are as good as the Camera, Recorder, and Monitor can produce
"on the bench". In effect, when a transmission facility is properly equalized, the
transmission facility becomes "transparent" and will not degrade the picture that a
given Camera, Recorder, and Monitor can produce.
The VLTG-800 becomes instrumental in adjusting the equalizers and
amplifiers for optimum performance. It is not enough just to add some gain and
equalization to the transmission facility. It is just as important to add the
right
amount of compensation. More compensation than is required is just as bad as
none, or too little compensation. The VLTG-800 in conjunction with the CM-1
Camera Master makes it possible to correctly equalize any cable so that it
becomes transparent to the video signal.
To exactly compensate for cable loss, temporarily connect the VLTG-800 in
place of the Camera and connect the CM-2 Camera Master in line with the input to
the Monitor. With all of the equipment turned on and working correctly, observe
the CM-2 (on the SYNC scale). Adjust the amplifier LEVEL control until the CM-1
reads 40 IRE Units. Next set the CM-2 to the COLOR BURST scale and adjust the
DEFINITION control on the equalizer until the CM-1 reads 40 IRE Units on the
color burst scale. When both SYNC and COLOR BURST read 40 IRE Units on the
CM-2, then the transmission system is perfectly aligned to the optimal 40-40
condition and the transmission system is now transparent to the video signal. In
this condition the transmission system will transmit the full capability that any
Camera, Recorder, and Monitor can produce.
CCTV TRAINING MANUAL PAGE 24 OF 28