Video Balun & Surge Protector HDT-1F PRO (UTP)



Video Surge Protector OPV-1
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 an autotransformer 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.
Video Balun & Surge Protector HDT-1F PRO (UTP)Video Balun & Surge Protector HDT-1F PRO (UTP)
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)

Video Balun & Surge Protector HDT-1F-EXT (UTP)Video Balun & Surge Protector HDT-1F PRO (UTP)
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)

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)



Model HDT-1F PRO
Product type Surge arrester
Brand Ewimar
Input parameters number 1
connector type Removable screw socket
UTP impedance ohm 100
Operating band MHz 42
Output parameters number 1
connector type Cable with male BNC connector
BNC impedance ohm 75
Loss dB 0,4
Protection surge protection Gas protector, transil, MOSFET fuse
line-to-ground protection Gas protector: 90 V, 2 × 10 kA @ 8/20 us
line-to-line protection Protective bridge: 6 V, 100 A @ 8/20 us
maximum overvoltage level 4 kV
protection circuit capacitance 7-9 pF
Operating temperature °C -40 .. 60
Dimensions mm 82 × 24 × 31