EFHW Insertion Loss

Insertion loss is a term that describes the amount of signal power lost when a signal is passed through a device or component, such as an antenna. In the case of EFHW (End-Fed Half-Wave) antennas used in ham radio, one factor that can contribute to insertion loss is the type of ferrite core used in the current transformer.

The current transformer is an important component of an EFHW antenna, as it is used to match the impedance of the antenna to the impedance of the transmitter. The current transformer typically consists of a ferrite core wrapped with a wire, with the antenna wire passing through the centre of the core. The type of ferrite core used in the current transformer can have a significant impact on the performance of the antenna.

Ferrite cores are made from a material that has a high magnetic permeability, which means that it can store magnetic energy. This property makes ferrite cores useful for a wide range of applications, including inductors, transformers, and antenna matching networks. In the case of EFHW antennas, ferrite cores are used in the current transformer to match the impedance of the antenna to the impedance of the transmitter.

One important factor that affects the insertion loss of the current transformer is the type of ferrite core used. Ferrite cores come in a variety of shapes and sizes, and different types of ferrite cores have different magnetic properties. The most commonly used ferrite core for EFHW antennas is the type 43 material, which has a high saturation flux density and a low loss factor. Other types of ferrite cores, such as type 31 or type 52, may also be used, but they may have higher insertion loss due to their different magnetic properties.

Insertion loss can also be affected by the size and number of turns of wire used in the current transformer. The larger the ferrite core and the more turns of wire used, the higher the insertion loss will be. However, using too few turns of wire can result in poor impedance matching and reduced performance.

To sum up, insertion loss is an important factor to consider when designing and using EFHW antennas in ham radio. The type of ferrite core used in the current transformer can have a significant impact on the insertion loss of the antenna, with type 43 material being the most commonly used due to its low loss factor. By selecting the appropriate ferrite core and tuning the antenna to achieve optimal impedance matching, you can minimize insertion loss and maximize the performance of their EFHW antenna.
EFHW Insertion Loss

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