Browsing by Autor "Peter Carvajal"

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    Impact of warm-up on S11 measurements of LoRa antennas using one-port USB-based VNAs
    (2024) Peter Carvajal; Víctor Guerra; Gustavo A. Siles
    The stability and accuracy of S11 measurements of an antenna can be significantly influenced by the warm-up process of the Vector Network Analyzer (VNA) used. In the present work, the S11 parameter of two LoRaWAN antennas, working in the range of 915 to 928 MHz, is measured using two different USB-based 1-port VNAs: a PocketVNA and an Anritsu unit. A step-by-step procedure of measurement is proposed in order to evaluate the effect of warm-up the instruments and metric errors are also calculated . It is experimentally shown that warm-up can reduce the variability and increase the accuracy of the measurements.
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    Implementation of a ground station to encourage space science in developing countries
    (2024) Jorge Soliz; Mishel Cuiza; Peter Carvajal
    This paper shows the implementation of a ground station (GS) at the Bolivian Private University, which aims, among other objectives, to promote space science and promote education in this field in a country like Bolivia where this type of technologies are not widely known due to the economic costs. involved. The GS, located at this institution, not only provides access to crucial space data and encourages scientific research at the university, but also establishes a strong connection between the university and local schools for the dissemination of space science. The presence of the GS at the Bolivian Private University offers an ideal platform to carry out outreach activities in collaboration with schools. These initiatives encompass educational talks, interactive workshops and guided tours, as evidenced in this work, thus giving school students the opportunity to explore and understand the fascinating field of space science. In this way, the GS becomes a valuable educational resource that inspires younger generations to become interested and participate in space-related disciplines. Furthermore, this collaboration between the university and schools will not only enrich the educational experience but will also contribute to the training of future professionals in space science. By participating in coordinated activities with the university staff responsible for the GS, school students can receive early guidance in scientific and technological careers, thus encouraging the development of local talent in these fields and in STEM (science, technology, engineering and math) disciplines.