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Coaxial cable received its name because it includes one physical channel that carries the signal surrounded by another concentric physical channel, both running along the same axis. The innermost channel is typically a copper wire, which is then surrounded by a layer of insulation between it and the outer channel. The outer channel serves as a ground, typically as copper mesh. Another layer of insulation surrounds both the inner and outer channels. Many of these cables or pairs of coaxial tubes can be placed in a single outer sheathing and, with repeaters, can carry information for a great distance.

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There are many ways to use light in a studio situation. The thinking process comes first. Photographers must determine what the final use of the image will be and that helps them decide what kind of light they will use.

As I have mentioned before, specially designed umbrellas that are way bigger than the subject, produce the softest light. This is the one I use every day and it is shown with its companion, the softbox fill-in light:

Light diffusion

Most coaxial specifications have an impedance of 50, 52, 75 or 93 ohms. Because of widespread use in the cable television industry, RG-6 cables with double or quad shields and impedance of 75 ohms have become a de facto standard for many industries.

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Working with beginning STUDIO LIGHTING students is great fun because it forces one to get back to basics when talking about and demonstrating various types of lighting. I have often written about how studio photographers are always looking for SOFT LIGHT. The reason is that it is much more flattering to subjects and it can reveal detail that much harsher, direct light obscures with deep shadows. Here are two images. One is lit with a DIRECT LIGHT, the other with a DIFFUSED LIGHT:

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Straight-line feeds to commercial radio broadcast towers have the least leakage and interference because these cables have smooth, conductive shields with few gaps in them. Interference is most significant in nuclear reactors, where special shielding is needed.

Electrical characteristics of coax are application-dependent and crucial for good performance. Two standard characteristic impedances are the following:

In the home and small offices, short coaxial cables are used for cable television, home video equipment, amateur radio equipment and measuring devices. Historically, coaxial cables were also used as an early form of Ethernet, supporting speeds of up to 10 Mbps. Since then, twisted pair cabling has largely supplanted the use of coax.

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The center conductor layer is a thin conducting wire, either solid or braided copper. A dielectric layer made of an insulating material with well-defined electrical characteristics surrounds the wire. A shield layer then surrounds the dielectric layer with metal foil or braided copper mesh. The whole assembly is wrapped in an insulating jacket. The outer metal shield layer of the coaxial cable is typically grounded in the connectors at both ends to shield the signals and as a place for stray interference signals to dissipate.

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DiffusedlightCeiling

There are many different types of coaxial cable connectors separated by two styles: male and female connectors. Connector types include the following:

Note that in this image there is virtually no shadow on the face. This is because it is being lit from opposite sides with very diffuse light. The top, MAIN LIGHT is made with my large umbrella and the bottom light is produced by a medium sized softbox. Here is what the softbox looks like:

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This light modifier is actually about 18″ x 24″. It attaches to a light head and allows light to bounce around inside it and then it is dispersed through a translucent material that serves as a diffusion screen. So it is a combination of a bounce light as well as a diffused one.

Diffusedlightphotography

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Coax connectors range from simple single connectors used on cable TV systems to complicated combinations of multiple thin coax links, mixed with power and other signal connections, housed in semi-custom bodies. These are commonly found in military electronics and avionics.

In order to make DIFFUSED LIGHT you need to place a translucent material over the source. It will scatter the light rays and create a softer, overall light on your subject. This is the same effect that a cloudy day affords. Light rays from a point light source such as the sun, are diffused over a wider area than the direct light and therefore produces less shadows and SOFTER lighting effects.

Dramatic lightings are produced usually without using any extra lights on the set. Other lights can sometimes be used to bring out some detail when it is wanted, but they are created mostly with the use of just one light.

I placed them side by side so the differences can be seen easily. Even though detail is evident in the first image, look how harsh the light is! They were both lit by a studio flash unit, but for the second one, I simply taped a piece of white copy paper over the flash head, a simple step that immediately reduced the glare of the light and made it more pleasing.

This image was produced with just one flash positioned about 45degrees off the camera axis to produce a REMBRANDT LIGHT. The shadow was intended to be in context with other, more dramatic images on this company’s website.

However, coax cables remain widely in use for cable broadband internet. Coaxial cables are also used in automobiles, aircraft, military and medical equipment, as well as to connect satellite dishes, radio and television antennae to their respective receivers.

What is transmitted lighting

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Nearly 50 distinct standards exist for coaxial cable, often designed for specific use cases in amateur radio or low-loss cable television. Other examples include RG-59/U -- used for carrying broadband signal from closed-circuit TV systems -- and RG-214/U for high-frequency signal transmission.

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RG-59 and RG-6 cables are commonly used in satellite television and cable modems. Older installations used the RG-59 cable before the implantation of the RG-6 cable. The RG-59 cable is thinner at a 20 American Wire Gauge (AWG) and has a copper center conductor. This cable is more likely to be found in older buildings and is better for CCTV and analog video systems.

Which cable an individual might need largely depends on the frequency. For requirements above 50 MHz, an individual should use an RG-6 cable.

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Coaxial cable was invented in 1880 by English engineer and mathematician Oliver Heaviside, who patented the invention and design that same year. AT&T established its first cross-continental coaxial transmission system in 1940. Depending on the carrier technology used and other factors, twisted pair copper wire and optical fiber are alternatives to coaxial cable.

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Mechanical stiffness can vary tremendously, depending on the internal construction and intended use of the coaxial cabling. For example, high-power cables are often made with thick insulation and are very stiff.

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Coaxial cables can experience a variety of different forms of interference. Signal leakage occurs when the electromagnetic field passes through the shielding on the outside of the cable. In other cases, an outside signal can leak through the insulation.

Characteristic impedance is sensitive to signal frequency. Above 1 GHz, the cable maker must use a dielectric that does not attenuate the signal too much or change the characteristic impedance in a way that creates signal reflections.

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This image was made by a SIDE LIGHT with the opposite side of the face kept in shadow to produce a graphic look for this graphic designer’s brochure. And, of course for really dramatic images, use a simple EDGE LIGHT:

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With this said, the way to achieve really soft lighting effects is to make sure the MAIN LIGHT IS MUCH LARGER THAN THE SUBJECT. For this reason, I use a very large and deep umbrella that not only spreads the light over a greater area, but also makes it soft by being so big compared to the subject. Here’s an example of what a large MAIN LIGHT does:

Some cables are deliberately made with thick center wires, resulting in skin-effect resistance. This resistance results from high-frequency signals traveling on the surface of the conductor, not throughout. A larger center conductor creates a stiff cable with low loss per meter.

Coaxial cable design depends on the control of cable dimensions and materials. Controlling these factors helps create a fixed value for the characteristic impedance of a coax cable. High-frequency signals are partially reflected at impedance mismatches, causing errors.

The RG-6 cable is a larger 18 AWG cable and also has a copper center conductor. The RG-6 cable is used with high-bandwidth and high-frequency hardware, where internet and satellite signals can run at a higher frequency compared to traditional analog video.

A coaxial -- or coax -- cable is primarily used by cable TV companies to connect their satellite antenna facilities to customer homes and businesses. Telephone companies also sometimes use coax cable to connect central offices to telephone poles near customers. Some homes and offices use coaxial cable, but twisted pair cabling has largely supplanted coax's widespread use as an Ethernet connectivity medium in enterprises and data centers.

Coaxial cables have concentric layers of electrical conductors and insulating material. This construction ensures signals are enclosed within the cable and prevents electrical noise from interfering with the signal.

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Coaxial cable is a type of copper cable specially built with a metal shield and other components engineered to block signal interference.

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In this picture I wanted to light the face but keep a bit of shadow to add some interest. You can see where the lights were placed by looking at the “catchlights” in the subject’s eyes. The big umbrella main light plus the smaller softbox fill-in produced this result. The image was made on location, but with the same setup I usually use in the studio.

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