Instrument Engineering, Metrology, Information-Measuring Instruments and Systems. Humanities of BMSTU http://ptsj.ru ©BaumanPress Instrument Engineering, Metrology, Information-Measuring Instruments and Systems. Humanities of BMSTU Thu, 15 Oct 2026 00:00:00 +0400 eng Thu, 15 Oct 2026 00:00:00 +0400 http://blogs.law.harvard.edu/tech/rss skozlov@bmstu.ru (Sergey kozlov) ak@akmedia.ru (Alexey Kuleshov) http://ptsj.rueng/catalog/iemim/sta/1125.html <html> <body> <p style="text-align: justify;">This article discusses methods for mathematical modeling of shortwave electronic device components using the QUCS-S (Quite Universal Circuit Simulator) computer-aided design system. This modeling system is based on the Ngspice computational kernel and enables frequency-domain analysis of electronic circuits, including calculation of scattering parameters. The paper describes an approach to modeling electronic devices based on their representation as two-port networks and S-parameter analysis. Simulations were performed to determine the frequency characteristics of key components of an amateur shortwave transceiver, including mixers, band-pass filters, and amplifier stages. Methods for calculating key parameters of high-frequency circuits, such as reflection coefficient and standing wave ratio, are also presented.</p> </body> </html> books Thu, 15 Oct 2026 00:00:00 +0400 http://ptsj.rueng/catalog/iemim/sta/1125.html