v2.0 10/26/10
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5. SETTINGS
Image brightness and sharpness may vary according to the distance between the camera and
the ST-CCTV-VBAC4. To help achieve the best image quality, first adjust the
ST-CCTV-VBAC4’s DIP switches (K1, K2, K3 and K4) as depicted below.
Below 656’
492’ – 1,476’
2,296’ – 3,608’
3,280’ – 3,937’
984’ – 2,296’
1,640’ – 2,952’
2,624’ – 3,937’
More than 3,937’
The ST-CCTV-VBAC4 has 4 sets of DIP switches. Each set is dedicated to a specific device
and connection.
After setting the DIP switches for the proper distance for a given device you can adjust the HF
and LF potentiometers for proper contrast and brightness. Note this should be done with a
video waveform monitor or other video test equipment. However, if such equipment is not
available a video monitor can be used.
6. TROUBLESHOOTING
a. Video image appears scrambled – (i) Check to be sure all UTP wiring connections and
polarities are consistent at each device and ST-CCTV-VBAC4 input (terminal block or
RJ45 connector).
b. Video image has some ripples – This may be caused by electro-magnetic
interference. Be certain all cables are away from any devices that may cause such
interference (e.g., electrical motors, furnaces, etc.).
c. Video image lacks brightness and/or sharpness – Adjust the ST-CCTV-VBAC4’s DIP
switches for distance and HF/LF potentiometers for contrast and brightness. A video
waveform monitor or other video test equipment should be used.
d. Can shielded twisted pair cable be used – Although shielded twisted pair cable can be
used, the cable’s high-frequency roll-off will degrade the distance performance.
Therefore, it is not recommended beyond a couple hundred feet.
e. Additional troubleshooting assistance can be found on-line at
www.securitytronix.com
in addition to support from SecurityTronix sales engineers at 1-610-429-1511.
