How to extend a CCTV cable?

When transferring video surveillance systems, we are faced with the fact that the current wire is not enough and needs to be lengthened. Let’s consider how to increase it without losing video quality. As we already know, to transmit a signal over a coaxial cable, a center conductor (usually mono-core) and a braid (multi-core) are used.

The connection method may vary depending on the type of coaxial cable and the environment in which the joint will be located.

Extend outdoor CCTV coaxial cable or twisted pair cable.

The joint is outdoors, in the ground, or in other harsh conditions. Provide a sealed protective box by placing the docking point in it. For a secure fit and for a better seal, we use heat shrink tubing. Under the influence of temperature, it shrinks and reliably fits the junction of our wires. When using plastic junction boxes and there are no sealed glands in them, you can additionally coat the sealing gum with sealant.

The center conductor of a coaxial cable can be solid or stranded.

To extend (connect) a solid cable:

To extend (connect) a multicore cable:
– The central vein is composed of many thin, soft, interwoven threads. We clean and twist all the hairs of the central core together, dip in neutral soldering grease, and then, thanks to a soldering iron, into molten solder. As a result, the central core will become tinned and solid. Next, we connect two wires in the same way as in the case of a mono-core: using two F connectors and an F socket (barrel).

Other ways to extend your CCTV coaxial cable:

How to extend your USB cable up to a 100ft

Extending the video surveillance cable based on twisted pair.

How to lengthen a twisted pair cable?
– It is best to extend the twisted pair with a connector and connectors: “feed-through modules”. First, you need to crimp the two ends of the wire with the rj-45 (8P8C) connectors with a crimper. Next, they need to be connected with a “pass-through module”.

How to fix a USB socket to a hard network cable

The assembly of my cable was somewhat complicated due to the fact that I had at my disposal not a USB cable socket, but a socket for printed circuit boards.

I had to first isolate the contacts from the back of the case.

DIY USB Extension Cable for USB Webcam (with Cat 5e Ethernet Cable)

And then from the bottom wall of the case (shown in the photo above).

For a not very rigid cable, for example, consisting of only two twisted pairs, you can use this method of attaching the socket to the cable.

First, using sewing threads, we attach a piece of PVC tube (cambric) to the cable. The end of the thread can be secured with molten rosin. On the cambric and cable insulation we make two longitudinal cuts.

It should look something like this. The formed “petals” should be arranged in the form of a cross.

Then you can solder the ends of the twisted pairs to the corresponding pins.

We attach the “petals” to the body of the nest with sewing threads. We fix the end of the thread with rosin.

Now you can refine the nest by wearing a heat shrink tubing or covering it with polyethylene (from a pistol).

But, I only had a very rigid cable, so the mount had to be made more serious.

First, I wound a copper wire with a diameter of 1.3 mm around the edge of the cable. Then I soldered the ends of this wire to the side walls of the USB socket.

To give additional rigidity to the structure, I covered the junction of the cable with the USB socket with low-temperature hot melt glue.

To give a more fine-looking shape and improve the appearance of the connector, I covered it with a heat-shrink tube. IN

Attention! During the shrinking of the tube, the hot melt adhesive may seep through the slots and into the interior of the socket. To prevent this, you can insert a spacer between the tube and the housing of the socket, or a plug into the socket. Then you don’t have to pick out the hot melt glue from the nest.

How to make a long USB extension cable from a network cable?

How to make a long USB extension cable from a network cable?

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I had the following connectors at my disposal: a USB socket designed for installation in a printed circuit board and an 80 cm piece of cable with a USB plug at the end.

Initially, I tried to make a flexible extension cord from a 4m AV cable, but the attempt was unsuccessful. When I inserted the flash drive into this cable, the OS “said” that the device is not working properly.

So, it was decided to use a twisted pair cable, especially since I had several pieces of a network Ethernet cable left over from the days of distributing the Internet through a local network. The network cables turned out to be of the lowest quality, since they did not have any screens. Each piece of cable had four twisted pairs in plastic insulation. Judging by the color and stiffness of the veins themselves, they were made of some kind of copper alloy, similar to brass.

For signal and power transmission in USB2.0 format, at a distance of up to 5 meters, only two twisted pairs are enough. Remaining twisted pairs can be omitted.

However, if the resistance of the cable cores is high, and the device connected to the end of the cable consumes a significant current, then you can start up the power immediately through two or even three twisted pairs.

Let’s take a closer look at this moment.

For example, if the current consumed by a USB device is 400mA, and the resistance of one pair is 2 Ohms (both ends), then the resistance of the USB device will be:

In this case, the voltage drop across the cable will be:

5 0.67 / (12.5 0.67) ≈ 0.25 (Volt)

Then the voltage drop on the cable will decrease and will no longer be so critical.

Do it yourself on a budget solution of technical, and not only, tasks.

About pinout (pinout) of USB plugs and sockets

The picture shows the pinout of the USB 2.0 socket and plug.

For data transmission (Data and.Data), you can use any of the four available twisted pairs.

To connect the power, you can use any of the three remaining twisted pairs or all three pairs connected in parallel.

How to connect two cables?

To reduce the load on the laptop’s USB jack, I had to lengthen the hard network cable with a piece of flexible pigtail cable with a USB plug at the end. As you can see from the photo, the ends of the cable were cut to different lengths to avoid shorting the wires together.

To reduce the load on the rations, I put a tube of the network cable on the insulation of the tail.

The final connection of the two cables was made using a heat shrink tubing.

And this is a ready-made 5-meter USB extension cable.