EverFocus EHA-SRX Cable Requirements For Bnc Connector, Cable Types, Cable Installation, Eha-Srx

EHA-SRX

7. CABLE REQUIREMENTS FOR BNC CONNECTOR

7.1 Cable Types

The EHA-SRX allows a total signal attenuation of up to 43.5 dB along the cable between devices. The actual maximum cable length depends on the attenuation characteristic of the particular cable used. Generally speaking, the better the cable quality, the lower the signal attenuation, thus the longer the distance the HD-CCTV video signal can be carried.

The following table gives examples of different cable types, losses and the distances that can be achieved. These are only examples and the actual distance is determined by the attenuation characteristic of the cable in your application.

The table below gives an orientation for achievable cable distances:

Cable Type	Attenuation in dB at 1	Max. Cable distance in
	GHz per 100 m / 328 ft	m	ft
RG-59	24 ~ 40 *	70 ~ 160	230~520
RG-6	15 ~ 35 *	100 ~ 190	330~620
RG-11, CATV-lowloss	8 ~ 16 *	180 ~< 250	590~<820
cables

*Low quality cable may have higher attenuation

7.2Cable Installation

Please make sure, that the coaxial cable is not squeezed at any position.

Also the max. bending radius defined by the cable manufacturer should be considered.

General rule: maximum bending radius = 10 x outer cable diameter

Bending creates pressure on the center conductor, causing it to move through the dielectric toward the inside of the bend. This affects impedance and return loss and reduces the maximum possible cable length.

Please try to avoid any BNC - adapter or any connectors in the BNC cable. Looping HD-SDI signals by BNC T-connectors to other devices is not possible.

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