Characteristics and common uses of a directional antenna phase cabinet

One of the key components of a directional antenna system, which involves an aerial receiving or transmitting device that converts electrical energy into radio waves and vice versa, is the phaser equipment (also known as a phasor cabinet). This system is widely used in directional AM stations and in the medium wave (AM) frequency band, since it allows the signal to be strengthened in a particular direction and reduces interference to stations located in other directions that are not desired. In fact, it is possible to set the degree of directivity of the antenna radiation pattern, which is controlled by the amplitude and phase weights of each individual element.

To ensure maximum accuracy and stability, phase equipment is used. The phasor manages the power that is sent to each antenna tower in a system. The phasor cabinet contains tuning coils, fused mica/vacuum capacitors, inductors, RF contactors, and variable circuit junctions connected to the other components; everything is housed in the cabinet where someone can make most of the adjustments (on the front panel control knobs) to increase the coverage area or achieve the best antenna gain (beamwidth) and path, or nullify interference .

A phasor can even help fix small transmission problems. It is not uncommon to find a slight change in the directivity or performance of the antennas. However, a simple solution can be applied by controlling the cabinet knobs. Through this radio component, the phase and power going to each antenna can be adjusted.

On the front of the phasor cabinet, base current levels can be checked without opening cabinet doors or removing cabinet panels, as there are indicators showing the mode of operation. However, a technician may need to use the rear doors of the cabinets for easy access to parts and access to all housed components. Sometimes an engineer may need to check the equipment inside the cabinet, when he needs to inspect the system after finding a fault in the system. From the inside, the person can insert a measuring instrument, for example, to troubleshoot and repair what may not be working properly.

A good example of the phasor not working properly is when the owner’s antenna monitor readings change drastically or there is a missing shorting bar (J plug) that may have come out of its socket/jack. Occasionally the cabinet requires a radio engineer to figure out the problem(s) and make sure the transmitter(s) are feeding the phasor.

In addition to changing the phase or increasing the amplitude of the signal, for example to obtain the necessary direction of the antenna system, the phasor unit is also crucial for the operation of other devices, such as the antenna tuning unit (ATU), line termination unit (LTU) and antenna coupling unit (ACU), whose feeder lines are also correlated to each tower. In order to obtain sufficient signal strength and correct phase and array parameter matching, it is critical that each unit work side by side to obtain the desired directional pattern and achieve the desired measurements.

In short, the phasor, its power matching and dividing equipment for directional AM operation, housed in the cabinet, is purposefully used as a phase drive controller ensuring that power is applied to each antenna. It is commonly used as a monitoring system to check for pattern changes, which can be customized to meet user needs.

Common features of a good cabinet include:

• Easy front and rear panel access through hinged doors

• The ability to check current levels without even opening the front doors

• Digital front controls including aluminum handles or knobs for precise adjustments

• Dual AC receptacle in each bay

• Clear identification of each component through engraved labels

• J-plugs positioned for easy access, including adjacent bridge grounding posts

• Interior panels dividing the bays, so that RF isolation can be ensured to day and night networks

• A variety of fixed and variable capacitors

• An input current meter that allows remote output

Construction and Location – Directional antenna phase units are typically constructed in non-corrosive, weather-resistant aluminum housings (when placed outdoors) or housed in metal cabinets (when used indoors) or on mounting brackets. support for; they can also have an open panel and ATU type shelf for wall mounting.

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