Ham radios can be set up in the middle of nowhere and do not require the internet or cell phone technology. There are many different types of coaxial cable. Your application will determine which cable has the best characteristics. There are hundreds of cables to choose from to fit every need you have, but here are a few common types. If you are very calculating specific rates of loss or ohms, please see technical specs for each type.
It has an impedance of 75 Ohm and is used in a wide variety of residential and commercial applications including cable television. RG-8 is similar to RG-6, but unable to carry pure video signals.
It has an impedance of 50 Ohm and is used in audio control rooms, radio stations or as connections for external radio antennas. It has an impedance of 75 Ohm and provides 3 GHz frequency. They provide greater flexibility, ease of installation and lower cost. They are used as transmission lines for antennas on missiles, airplanes, ships, satellites and communications. It has an impedance of 50 Ohm, and is great for short antenna feeder runs.
This also has a feature of low PIM. It is used for jumper assemblies in wireless communications Systems and short antenna feeder runs.
If you need a cable that requires periodic or repeated flexing, choose this one. It is more flexible that air-dielectric and hardline cables in terms of bending and handling. It also has an impedance of 50 Ohm. Coaxial cable comes in varying lengths. The shorter and thicker the cable is rated will determine the strength of the signal transmitted.
It is important to choose the right cable length and thickness. In radio systems, cable length is comparable to the wavelength of the signals transmitted. You can study the math involved in deciding the best cable length to use. Characteristics of the cable, such and outside diameter of the inner conductor, inside diameter of the shield, dielectric contact of the insulator and magnetic permeability of the insulator all affect the quality of the wavelength going through your cable.
Used in radio, microwave and fiber optic applications, this is the signal strength. The type of coaxial cable used will determine your signal strength and how many dBm your cable can handle. Impedance is the amount of resistance the waves proceeding through the coaxial cable encounters. The lower the impedance, the more easily the waves flow through the cable. Each type cable has an impedance rating. Factors affecting this is the size of the cable and what materials the cable is constructed from.
Standard coax impedances are ohms. This has been tested as a great balance between power handling a low loss. PIM stands for Passive Intermodulation. When you connect two metals, the result is nonlinear elements and a distortion in the signal may occur. As the signal amplitude goes up, the effects will be more significant. This happens often when connecting antennas, cables and connectors. Make sure you place the antenna amplifier before the splitter. I am looking at a Channel Master CM According to the Channel Masters website.
This is usually given in dB. However, the internal splitters that provide multiple outputs add signal loss, or negative dB. In a two output distribution amplifier, the signal splitter on the output of the amplifier will divide the signal into two separate output ports. If a distribution amplifier has 15 dB of fixed gain, a four output distribution amplifier will have an effective gain of about 7.
It looks like there is some signal loss. You might want to contact Channel Master to clarify. Amplified splitters also add more than twice the amount of noise to the signal as a quality preamp. Much more noise than a preamp like the Winegard LNA for example. So the best solution is to use a LNA and a splitter as opposed to a amplified splitter like the Channel Master. The Winegard has plenty of gain to drive a 8 port splitter and much better immunity from overload.
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Please see my Disclosure. Main Coaxial Cable Stack. Attic OTA Antenna. TV Input. Subscribe to Blog via Email Enter your email address to subscribe to this blog and receive notifications of new posts by email. June 11, 0. Last updated: Friday, June 11, Finding a quality indoor over the air antenna can be hard.
Many are not big or powerful enough to obtain any channels. They lack the strength to receive any channels on the VHF band. It is a bit larger than most indoor antennas, but its flat and sleek design makes it easy to mount on a wall or sit in its stand. I started this site to educate the public on alternative ways you can watch television besides subscribing to cable.
I have been in the audio-visual business for over 20 years. I also have an extensive computer networking background. I hope you will find my articles and reviews helpful in conscious uncabling. MikieB October 15, at am Reply. Johan October 15, at am Reply. Scott January 31, at pm Reply. Johan January 31, at pm Reply. Scott Weaver February 1, at pm Reply. Brandi Nichols December 22, at pm Reply. Johan December 22, at pm Reply. Stephanie January 10, at am Reply.
Johan January 11, at pm Reply. Jim Navotney April 25, at pm Reply. Sandra April 9, at pm Reply. Johan April 10, at am Reply. It means more often than not that you are not far enough above the threshold of signal level into your TV to prevent little hiccups, drop-outs and interferences in signal from interrupting the Stream of Data. Remember that lots of things can happen from the Station on the way to your TV set! The gain of a Line Amplifier should be selected to zero out the loss that follows it.
In other words, if you have fifty feet of cable and a two-way splitter, then a 10 db amplifier will be fine.
Conversely, if you have an eight-way splitter and hundreds of feet of cable, you will need an amplifier with a higher gain. Just as in the case of a Pre-Amplifier, however, bigger is not always better. Call: What are types of Cable modem and TV amplifiers available in the market? Forward Gain Amplifiers: These type of amplifiers typically boost signal in downstream path and with little to no loss in return path Return Gain Amplifiers: These type of amplifiers are typically used to boost signals in Upsteam or return path in MHz frequency range.
What are frequency bands of amplifiers?
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