Communications
The satellite communications subsystem consists of a modem, a transmitter, a receiver, an antenna switch, and an antenna.
The on-board antenna is a quarter-wavelength resonant monopole located on the top face of the satellite. The monopole is formed by a copper-beryllium sheet 190 mm long and 10 mm wide.
The on-board transmission-reception equipment is based on commercial equipment from Aydin Vector, specifically the T-110u and RCC-103-1 models, which allow the modulated signal to be generated and amplified up to the desired power level, as well as to receive the signal and demodulate it to baseband.
The T-110u transmitter is a solid-state device with a crystal-stabilized radio frequency (RF) carrier generator and frequency modulator without preemphasis; both the components and the transmitter assembly have specifications for space use. The transmitter output frequency is 400 MHz with 0.003% (12 kHz) stability and provides 10 W (40 dBm) output power over a 50 ohm output to antenna impedance and standing wave ratio (SWR). ) of 1.5:1, with a harmonic and spurious level in accordance with the IRIG 106-80 standard.
