![]() ![]() This paper presents the design and preliminary testing results of a linear polarization HF monitoring very compact lightweight active phased array that produces a radiation pattern with a sufficient front-to-back ratio specially designed to be installed in locations where limited space imposes a limitation. A similar limitation applies for the dipoles of the Log Periodic antenna. Directional HF antennas, like the Yagi, that employs passive elements such as reflectors and directors cannot be shorter than the proper dimensions and still function properly. Although an HF short dipole's efficiency is lower than the half wave dipole, it can be enhanced by the use of active circuits for usable monitoring purposes. The goal of this laboratory is to learn some useful features of the Multisim simulation software and to highlight some differences between the computations as they are done in class and the results of Multisim simulations and benchtop experiments. Notice that the visible measurements includes gain. Click Simulate > Instruments > Preset Measurement Probes > Voltage with reference to probe Select Probe1 as the reference Place the probe on the output. This is because an HF antenna must be designed around the proper wavelengths to operate at a satisfactory efficiency, especially when a certain level of directivity is also a requirement. To get the gain: Click Simulate > Instruments > Measurement Probe Place the probe on the wire between the voltage source and the resistor. One of the most vital issues regarding the installation of HF antennas is their sizable dimensions. ![]()
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