Abstract
<p class="AbstractL-MAG"><span lang="EN-US">SWR Analyzer is an electronic device radio is useful to know the value of VSWR and antenna impedance without the use of radio tranciever. In this final use Direct Digital Synthesizer (DDS) to generatewaveforms analog digitally. DDS signal generation programmable via Arduino nano. The frequency used is aantenna operating frequency dipole 7 MHz which are in the range 6.9 MHz - 7.4 MHz.calibration SWR Analyzer is done by providing a form of pure resistor load with the acquisition of a data error of 4% as compared with the theory. The test results niali VSWR atantenna dipole 7 MHzusing an SWR Analyzer then compared with measuring devices in general, ie VSWR SWR meter. Earned value matching 1: 1 obtained by SWR Analyzer at a frequency of 6.9 MHz, while using the SWR meter lowest VSWR values obtained at 7:04 MHz frequency with a value ofratio matching impedance1:35: 1. The accuracy of the measurement results using the SWR Analyzer when compared with SWR meter reaches a value 83%.</span></p>
Highlights
Direct Digital Synthesizer (DDS) is a technique ofgeneratingwaveforms analog digitally that are very accurate in frequency synthesizing, by means of digital signal generation and converted intoform analog using a digital to analog converter where the frequency is raised can be changed as needed [1]
MeasurementVSWR value in this research using SWR Analyzer SWR meterand which serves as a comparison
TEST RESULTS SWR ANALYZER WITH PURE RESISTOR
Summary
DDS is a technique ofgeneratingwaveforms analog digitally that are very accurate in frequency synthesizing, by means of digital signal generation and converted intoform analog using a digital to analog converter where the frequency is raised can be changed as needed [1]. SWR Analyzer utilizing Arduino programming to generate sine signal and applied to the measurement of the HF band dipole antenna with 7 MHz operating frequency. Where: fout =frequency output DDS M = value tunning word fc = refrence clock n = length of the phase accumulator [3]. How it WorksDDS Phase accumulator and DAC is a major component in the DDS, this section will generate a sine signal at a specific frequency based on reference clock and the binary number in the form of tuning word. To generate a sine wave which is fixed, constant value (phase increment specified by binary numbers) will be added to the phase accumulator at every clock cycle. If the phase increment is small, the phase accumulator will step more, resulting in a low-frequency sine wave
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