First things first, what is a 4-channel passive video balun?
A 4-channel passive video balun is a specialized electrical transformer that converts differential electrical signals to unbalanced (also known as single-ended) electrical signals. A 4-channel passive video balun is used when dealing with radio frequencies. For example, when the length of the cable is too long, when it is unshielded or when it is mismatched in impedance, then there is a possibility of loss signal; this is where the 4-channel passive video balun comes in.
The majority of digital video security and surveillance cameras still use coaxial cable specifically the RG-59. The RG-59 is a shielded cable that has an impedance of 75 ohms and that has aluminum, mesh wires or even plastic sheath. These features prevent the loss of desired radio frequency in and prevent external noise from reaching the cable. Now, let’s talk about CAT5 or Ethernet cables. Ethernet cable has a twisted pair of wires that cancels out electromagnetic interference from external sources. It is also called UTP or short for Unshielded Twisted Pair cable because it contains no shield that prevents outside noise for radio frequency applications. Ethernet cables can also be used for video transmission lines for digital video security cameras, but it has an impedance of about 100 ohms. Since the camera is transmitting its video data at an impedance of 75 ohms and the DVR has to receive it at 75 ohms, then there is a clear mismatch between the Ethernet cable and everything else.
This is where a 4-channel passive video balun comes in. The video balun will correct the mismatch of ohms going to and from the cable; in addition, the balun may also correct for noise, white balance, and other video signal attributes. It also enables four different signals to be sent over one CAT5 cable that is up to 1200 feet in length. When using a 4-channel passive video balun, make sure to purchase two units. The first one converts the signal from BNC to CAT5 while the second video balun converts the CAT5 back to BNC so it can be used by the DVR.
A 4-channel passive video balun is a specialized electrical transformer that converts differential electrical signals to unbalanced (also known as single-ended) electrical signals. A 4-channel passive video balun is used when dealing with radio frequencies. For example, when the length of the cable is too long, when it is unshielded or when it is mismatched in impedance, then there is a possibility of loss signal; this is where the 4-channel passive video balun comes in.
The majority of digital video security and surveillance cameras still use coaxial cable specifically the RG-59. The RG-59 is a shielded cable that has an impedance of 75 ohms and that has aluminum, mesh wires or even plastic sheath. These features prevent the loss of desired radio frequency in and prevent external noise from reaching the cable. Now, let’s talk about CAT5 or Ethernet cables. Ethernet cable has a twisted pair of wires that cancels out electromagnetic interference from external sources. It is also called UTP or short for Unshielded Twisted Pair cable because it contains no shield that prevents outside noise for radio frequency applications. Ethernet cables can also be used for video transmission lines for digital video security cameras, but it has an impedance of about 100 ohms. Since the camera is transmitting its video data at an impedance of 75 ohms and the DVR has to receive it at 75 ohms, then there is a clear mismatch between the Ethernet cable and everything else.
This is where a 4-channel passive video balun comes in. The video balun will correct the mismatch of ohms going to and from the cable; in addition, the balun may also correct for noise, white balance, and other video signal attributes. It also enables four different signals to be sent over one CAT5 cable that is up to 1200 feet in length. When using a 4-channel passive video balun, make sure to purchase two units. The first one converts the signal from BNC to CAT5 while the second video balun converts the CAT5 back to BNC so it can be used by the DVR.
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