Abstract :
This research utilizes a Software Defined Radio (SDR)-based
communication system operating in the high frequency band of 7 MHz. The
communication system with SDR technology consists of two main components: the
SDR Transceiver and the Antenna Wire Dipole, which assist in the proper
functioning of the SDR-based communication system. Software Defined Radio
(SDR) is a technology that utilizes software to execute all commands given by
humans, such as HDSDR software. Software Defined Radio (SDR) is a new
paradigm that designs architecture by placing ADC and DAC devices after the RF
front end, making it more realistic. This is due to cost limitations and the expensive
nature of wideband designs in SDR-based transceivers. The transceiver is divided
into two parts: the receiver, which captures signals received by the antenna wire
dipole, and the transmitter, which emits sound waves that can be properly received
by others. In this research, an ICF-SW33 radio receiver is used to receive signals
transmitted through the SDR transmitter. This research is conducted using five
methods: literature study, component collection, system design, system testing and
test results. Testing on the SDR transceiver is performed using three different
frequencies to compare the results obtained from each frequency. The data
collected in this research include frequency, modulation, noise, audio quality, RF
and AF gain, and S-Unit Squelch. Spectrum analyzers and power meters are used
as measurement tools in this research.