Development and measurement analysis of transceiver and TNC for IiNUSAT nanosatellite payload communication

摘要

In this paper, some development and testing for payload communication board using Tranceiver ADF7021, temperature sensor and and integration with TNC are proposed. Transceiver ADF7021 is developed for 145.95MHz uplink frequency and 436.915MHz downlink frequency and to be applied for IiNUSAT Nanosatellite payload communication. The payload communication board is developed to be able for 2FSK demodulation and 1200bps data rate for receiver, and 2FSK modulation with 9600bps data rate for transmitter. In addition, the payload communication board is also support for data encapsulation using ADI protocol, and data delivery and must match for uplink frequency. TNC is designed to be able to fulfill the utility as data processing storage FX.25 data protocol, and temperature sensor at TNC board. Temperature monitoring is developed using LM35DZ and is designed for temperature range from 0–100°C. The testing resuts showed that payload communication board is work at the center frequency of 436.915MHz with −29.2dbm gain and −28.8dbm gain at a frequency of 436.91MHz. TNC is work and can be communicate the data to nanosatellite OBDH system. In addition, programming LM35 temperature sensor has been successfully implemented with the normal conditions of 33°C.