Passive Video Balun EWIMAR TR-1F-HD for AHD/HD-CVI/HD-TVI Systems, Pack of 2

EWIMAR TR-1F-HD is a passive video balun kit supplied as a pack of two, designed to transmit analog HD video signals from AHD, HD-CVI and HD-TVI cameras over twisted-pair cabling. The devices perform balanced-to-unbalanced conversion to allow use of UTP or STP cable for CCTV installations, helping to reduce common-mode interference and enabling longer cable runs compared with direct coaxial connections. Each balun provides a simple, low-power way to integrate HD analog cameras into structured-cable infrastructures without signal boosters or active electronics.

Advantages

The EWIMAR TR-1F-HD units are passive, requiring no external power and offering plug-and-play operation for analog HD video links. They are compatible with multiple HD analog standards (AHD, HD-CVI, HD-TVI) which simplifies inventory and deployment. By converting unbalanced coaxial outputs to balanced twisted-pair signals they improve immunity to electromagnetic interference and allow installers to use commonly available UTP/STP cable to extend camera-to-recorder distances.

Suitable for

• Connecting AHD, HD-CVI and HD-TVI cameras to DVRs over UTP or STP cable
• Retrofit CCTV projects where coax runs are replaced or supplemented by twisted-pair wiring
• Short- to medium-distance camera links where passive conversion and low maintenance are preferred

When it may not be suitable

Because the TR-1F-HD is a passive balun, it does not provide signal amplification or active equalization. For very long cable runs beyond recommended passive limits, or in installations with severe cable loss, an active video extender or amplifier may be required. The unit is intended for analog HD formats and is not suitable for native IP camera transmission.

Key specifications

• Function: Passive video balun for analog HD surveillance signals
• Supported formats: AHD, HD-CVI, HD-TVI
• Cable type: Designed for use with UTP or STP twisted-pair cable
• Pack quantity: 2 units per package
• Typical installation: Camera-side and recorder-side connections between coax and twisted pair

How to use

Connect the coaxial video output of the camera to the BNC connector on the balun and terminate the twisted-pair cable on the balun's pair screw terminals or RJ-45-style connector depending on model end. At the recorder end, use a matching passive balun to convert the twisted-pair signal back to coaxial for the DVR input. Ensure correct polarity on the twisted-pair connections to maintain proper video phase. No power connection is needed for normal operation. Test the video feed after installation and, if necessary, swap pair polarity to correct picture inversion or color issues.

What to consider before purchase

• Confirm camera and DVR formats are AHD, HD-CVI or HD-TVI (not IP)
• Estimate cable run length and cable type to ensure passive transmission will meet distance requirements
• Check connector types and mounting needs to match your installation (BNC, screw terminals, etc.)

Usage recommendations

Use good quality UTP/STP cable (cat5e or better) and maintain proper pair polarity. For runs approaching the maximum passive distance, test the video under final cable routing and consider using shielded twisted pair in electrically noisy environments. Install matching baluns at both ends of the link for reliable operation.