That makes it good for lower frequency signals anything under about 50 MHz. It is commonly used for composite or component video signals often in the mini-coax variety. That also makes it a good choice for a closed circuit television CCTV video surveillance system.
By using this type of cable, you can run the power and video for your security cameras simultaneously, effectively cutting your install time in half. Satellite and internet signals run at higher frequencies than traditional analog video, and when TV broadcasts changed from analog to digital, and cable companies started switching to digital, the higher freuqencies made it necessary to find a more effective coaxial cable.
RG6 cable was designed to fulfill these requirements. It has a larger conductor, which gives you much better signal quality. The dielectric insulation was made thicker as well.
RG 6 is also made with a different kind of shielding, which allows it to more effectively handle Ghz level signals. While many RG 59 cables uses a foil shield in addition to the braid, RG 6 made it mandatory. The braid was originally in a looser weave e. Deciding between RG 59 and RG 6 is only part of the process. Each class of cable can have different types of shielding or jacket and may or may not be rated for your chosen installation. Some say that it means "universal" or "for general utility use.
If you need a certain type of jacket, make sure and check the specs. But we'll get into different jacket types later on. Shielding prevents 'noise' from interfering with your signal, and therefore preserves your signal quality. Coaxial cables usually come with two types of shielding: braid and foil. These cables have a heavier center conductor and an additional layer of shielding to better carry high frequencies with minimal loss. What about RG or RG-6 cables?
These types of coax cables are commonly available and primarily used for cable TV installations. But they are matched for 75 Ohm television systems and will have an extra loss factor when used on 50 Ohm radio communication systems.
Feedline loss is measured in decibels Db per feet. For example, if you have 6 db of feedline loss, your 50 watt signal coming out of the radio will be The good news is that if the antenna has 6 db of gain like the KB9VBR Slim Jim Antenna the signal will be multiplied so that as it exits the antenna, it will be near 50 watts again.
To calculate your total losses or gains, you subtract the feedline loss and add the gains from the antenna. The net result is your total gain or loss. Finally, in shopping around, you may notice that the feedline run is more expensive than the antenna. When installing an antenna system, you greatest expense is usually in the feedline. A wise ham told me several years ago to never skimp on feedline, but instead install the best that you can afford. You can use the Times Microwave System calculator to try out different combinations of cable length, cable style and operating frequency.
You can get a little more technical info about coaxial cable loss from this Question of the Week article. There are a few other cable specifications that you may be concerned about, depending on application.
Cables with solid center conductors are less flexible than those with stranded center conductors. The dielectric material and the outer insulating jacket can also affect the flexibility of the cable. Direct burial cable has a durable outer insulation that will withstand being buried in the ground.
The AmazonBasics coaxial cable has all the features one would expect from a quality coaxial cable, including RG6 gauge conductors and three layers of shielding. However, what makes the AmazonBasics coaxial cable stand out is its CL2 rating. A CL2 rating means that the AmazonBasics coaxial cables can be installed indoors and outdoors. This makes the AmazonBasics cable ideal for folks who opt for a roof-mounted antenna.
Anyone who has had the unfortunate experience of trying to connect a coaxial cable in a tight spot knows how hard it can be to thread one with only one hand. Fortunately, the EZ Grips make this headache a thing of the past. Furthermore, the EZ Grip caps can be removed, so you can chuck them in your toolbox and use them with other non-Mediabridge coaxial cables.
Additionally, Mediabridge coaxial cables boast a UL rating. This means that the cables are safe for in-wall use. Say goodbye to ugly black cables snaking all over your floor! All coaxial cables consist of a conductor wrapped in insulation and shielding.
Data travels down the conductor from the source of the signal, in this case your antenna, to your TV. The shielding protects that signal from electromagnetic interference.
Electromagnetic interference can be natural, like a solar flare, or man-made, like a mobile telecommunications network. Many of the coaxial cables on the market are triple-shielded to protect against interference. However, the coaxial cables from Cable Matters are quad-shielded. This offers an additional layer of protection against electromagnetic interference to maintain the fidelity and integrity of the broadcast being received by your TV.
This is beneficial to those who live in high-density areas such as cities, where there is a greater chance a signal could be interrupted by various electronic devices due to their close proximity to one another.
0コメント