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Antenna accessories

Termination resistance - Hirschmann
Ordered before 9 p.m., delivered tomorrow
€ 2,19
Coaxial Coupler Cable Connector
Ordered before 9 p.m., delivered tomorrow
€ 3,19
Coaxial Coupler Cable Connector
Ordered before 9 p.m., delivered tomorrow
€ 0,89
Termination resistance - Goobay
Ordered before 9 p.m., delivered tomorrow
€ 0,49

Antenna accessories

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Allekabels.nl has an extensive catalog of antenna material. To use coax cable it must be stripped, which means that the copper core must be made visible. We do this with a handy piece of antenna equipment: the stripper or also called coax stripper. With these, the insulation sheath (the outer jacket) is removed so that the copper core becomes visible. An ingenious piece of antenna equipment is the handy assembly wrench. It allows a stripped coaxial cable to be connected to a female F-connector: a threaded "female" connector. The wrench exists as single and 3-in-1 versions. The Hirschmann CKT 75 is there, for example, for testing cables. More specifically: testing short circuits in coaxial cable, connectors or couplers. Besides assembly tools and tester, the antenna equipment also includes coax cable connectors (coax connectors) to connect two coax cables together. Of course, we also have the aforementioned terminating resistors in the antenna materials catalog.

Antenna material

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Special antenna material constitutes the satellite TV combiner, which combines the signal from a satellite dish and from coaxial cable and then sends it to the receiver or television. Of course, this combiner can also be used to split the signal by using input as output. Our antenna material also contains lightning protectors. Important with this antenna material is the maximum current rating in Amps. Yet another antenna material is the Cable TV via UTP coax extender. UTP stands for unshielded twisted pair and is unshielded network cable. You use this when you don't have coax cable lying around, but you do have network cable. You can still watch cable TV thanks to this piece of ingenious antenna equipment. To make it possible for you to offer your own TV channels via free channels of cable provider Ziggo, we have included barrier filters with the antenna equipment. These only work without internet.

The antenna

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The antenna is a piece of antenna material that in its simplest form is a piece of wire. This wire captures radio waves in space and converts this radio frequency signal, RF, into an alternating current. Alternating current is current that changes direction a number of times per second, expressed in Hertz (Hz). Thereby, 1 MHz is equal to 1 million Hertz. Those radio signals are electromagnetic waves, that is, both electric and magnetic. Antennas can receive several such radio signals, each with its own frequency. Such a spectrum of RF signals to be received is called bandwidth and is expressed in Hz or rather MHz. In addition, the antenna is not equally sensitive to the RF signal to be received in all directions, or in other words, does not perceive the RF signal equally clearly in all directions. This directional sensitivity is expressed in a graph, the directional characteristic, or radiation diagram. This is also why we sometimes need to rotate an antenna to get better reception. Antenna gain is a measure of how effective the antenna is at picking up the RF signal and is expressed in decibels, dB. Furthermore, an antenna has a resistance that changes with frequency, i.e., a frequency-dependent resistance.

Skine effect and sheath currents

Skine effect and sheath currents are two different, yet very similar, terms when it comes to interference. Skin is English for "skin," in this context here: sheath. The antenna is connected to a piece of antenna material called coaxial cable. This consists of a core and a sheath. At higher frequencies, the impedance of the core increases and current is driven outward, so to speak, and flows through the sheath. This is because current takes the path of least resistance! Jacket current, on the other hand, is created by irradiation of interference signals from outside, or called magnetic induction. So with skineffect the initiative, so to speak, lies within the coax itself and with a sheath current outside it. In both cases, however, a current is going to flow through the sheath. A coaxial cable is symmetrical, very simply put: the core and jacket are different, asymmetrical (unbalanced). The antenna, a metal rod, is symmetrical or balanced. Both do not fit together neatly, which causes induced currents in the sheath to cause interference. And because there is a ground loop between the mains, the equipment connected to it and the antenna connection, that interference is transferred to the equipment's power supply and causes a hum there.

Avoiding and resolving interference

The disturbances caused by the skin effect and shroud current can be avoided, or otherwise eliminated, by using a convenient piece of antenna equipment: Balun. Balun stands for balanced/unbalanced. Another designation for this antenna material is shroud current filter. Also called ground-loop isolator or choke balun. Choke is the English for "strangle" or the term commonly used in the telecom world "pinch off. At the heart of this filter is a coil of copper wire tied around a ferrite core. Another form of "interference" is caused by reflection. Reflection occurs when a sound wave, which after all is the radio signal or antenna signal, bounces back against an open end of the coaxial cable forming a virtual wall. This causes this reflected wave to counteract the next outgoing wave. This happens a million times a second! The antenna signal is now going to distort. To avoid this, we need to terminate the coaxial cable with a piece of antenna material called termination resistor, which we connect to the coaxial cable. This artificially creates a coaxial cable of infinite length and thus the wave is no longer reflected back. Such a terminating resistor is expressed in Ohm or Ω, a common value being 75 Ω. The attenuation, i.e. attenuation of the antenna signal, expressed in decibels, is small and is around 1.5 dB.

The 4G filter

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4G stands for the fourth generation of mobile telecommunications, such as smart phones. These can interfere with other devices, such as a television, when they get close to them. As with the antenna, this is due to electromagnetic radiation: interference. This interference is also referred to as 4G LTE interference, where LTE stands for the system that makes 4G possible: Long Term Evolution. The filters in our antenna material range, parts to counter this interference, are quite consistently called 4G LTE filters. It is a so-called low pass filter, which suppresses the influence of the interference signal, conveniently just called 4G cell phone signal. This filter antenna material, is also referred to by the English term for suppressor, suppressor. The attenuation or degree of suppression of the interference signal is expressed in decibels, dB. Example value: 10 dB or over 8-fold attenuation. This piece of antenna material is no luxury in these days of intensive 4G use.