View of the device

HDT-1F-PRO is a high quality balun adapting the impedance of balanced UTP line to the impedance of unbalanced input or output of a CCTV device, combining very efficient surge/overvoltage protection of the connected devices. Thanks to a transformer with amorphous core and linear characteristic up to 42 MHz, the device is specially dedicated for CCTV systems transmitting HD video signals (AHD, HD-CVI, HD-TVI), as well as can be used in CVBS systems.

The built-in surge protection has three segments operating in the right order during lightning or other incidents of surges and voltage spikes of various levels. During normal operation, the video signal circuit is not galvanically connected to the ground, which eliminates harmful ground loops and the related interference.
An excessive electric charge is discharged to the ground in the initial stage of surge formation (at the rising edge), which lowers the overvoltage to a level safe for the connected cameras/DVRs. In order to discharge the surge current to the ground, the yellow-green wire should be connected straight to a good grounding system. Secondary overvoltages are eliminated by a separate circuit decoupled by a special resistor. This results in high durability and efficiency of the device, also in the case of multiple pulses (e.g. from a stun gun).

The idea of the protection system

Low capacitance of the protection circuits (7~9 pF) has minimal effect on the video signal transmission within 0~100 MHz frequency range, which is especially important in the case of the broadband AHD, HD-CVI and HD-TVI signals. The device uses branded BNC connector, which ensures high quality and durability of the connection, even in adverse temperature conditions.

In order to ensure full protection, it is recommended to use the baluns with surge protection and good grounding on two ends of the video transmission line. The application of HDT-1F-PRO on one side will effectively protect only the neighboring device.

Example of balanced transmission line (UTP) with HDT-1F-PRO video baluns with surge protection
on the transmitter side (HD camera) and receiver side (monitor/ DVR)

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Example of balanced transmission line (UTP) with HDT-1F-PRO video balun with surge protection
on the transmitter side (HD camera) and HDT-1F-EXT video balun with extreme surge protection
on the receiver side (monitor/ DVR)

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Name	HDT-1F PRO
Code	M17012
Input/output connector (balanced line)	Screw connection, removable terminal block
Output/input connector (device with 75 Ω video input/output)	Cable terminated with BNC-m
Bandwidth	42 MHz
Attenuation	0.4 dB
Overvoltage suppressors	3: air spark gap, gas discharge tube, Transil™
Line to ground protection	Gas discharge tube: 90 V, 2x10 kA @ 8/20 μS
Wire to wire protection	Transient voltage suppressor: 6 V, 100 A @ 8/20 μS
Maximum level of overvoltage	4 kV
Capacitance of the protection circuits	7-9 pF
Transmission range (1080p)	250 m
Operating temperature range	-40°C to +60°C
Dimensions	82 mm x 24 mm x 31 mm (excluding cables)