Our equipment is most commonly used with the following types of coax video cables:
RG59, CT125, CT100 and RG11
Other types of coax may be acceptable – please contact our technical support line.
As a general rule the higher the specification of the cable the lower the signal losses will be and the further you will be able to send a good quality picture.
The BH220 rack comes complete with power supply, front panel, extender card and mains lead. You will only need to connect the coax video cables and power supply and you will have a fully functioning unit.
The BH193/3125 VDA module consists of 1 x BH3125 twin channel circuit card and 1 x BH193 rear panel fitted with input and output BNC connectors. In addition each module comes with a copy of our installation guide and 4 x fitting screws. Once fitted into a BH220 rack each BH193/3125 VDA module will give you 2 seperate channels of 1 in 5 out.
It sounds as if you have a ground loop problem. The horizontal lines on your screen are called ‘Hum Bars’. If you have a strong video signal a passive Hum Rejection device, inserted into your cable run near the monitor should clear the problem. If your video signal is already suffering some degree of signal loss (poor quality cable / long cable run) then you will need to use an active Hum Rejection device such as our BH132 Hum Rejection unit.
Your video signal is being attenuated by the coax cable. You require some type of signal amplifier to compensate for the signal losses. For this relatively short cable run you could use a unit such as our BH184 installed near the monitor. If you have a long cable run then you would need to use a
BH184 at the camera and a Line Corrector such as our BH187 at the monitor end of the cable.
The BH184 unit is factory set for Unity gain. You will need to adjust the Gain and High frequency lift controls to compensate for your signal losses. Please refer to your Installation Guide for details.
Yes! Transmission of video signals using coax cable is referred to as unbalanced. An unbalanced video signal is one in which the signal level is a voltage referenced to ground. The outer screen of the coax is the ground.
Sending video signals using twisted pair cable is called “Balanced” video transmission.
If you use a short length of coax you can link one of the outputs of channel 1 to the input of channel 2. You will then have effectively joined channel 1 and channel 2 together to give a 1 in / 9 out VDA. If you repeat this process for the whole rack you will end up with an eight channel unit with
each channel having 9 outputs.
We offer a repairs service for all of our equipment. Simply return the unit or PCB to us with your contact details and a brief description of the problem. We will fax or e-mail you with the repair costs for your approval before carrying out any work.