This study proposes general criteria to identify a radio quiet zone (RQZ) and a radio notification zone (RNZ) for the installation of a radio astronomical observatory on-site and safeguard the radio astronomy spectrum specifically in tropical regions. This study focuses on areas with a medium population density. Most RQZs selected in the world are mainly located in regions with a low population density, whereas this work studies the radio frequency interference (RFI) environment in humid tropical regions that have not been studied. The humidity in the tropical regions has a significant effect on radio signal, and this provides a unique perspective to the study. This study implements an algorithm to model the RFI level by considering important humidity factors. The ideal sites are chosen based on the RQZs criteria, whereas the realistic sites are based on the RNZs criteria. In Malaysia, four ideal and another four realistic candidate sites were identified, and the on-site RFI level measurement was conducted. From this study, Kuala Tembeling site is suggested as the RQZ and the Jelebu site as the RNZ in Malaysia.

中文翻译：

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中等人口稠密地区和热带潮湿国家的射电天文学的无线电安静区和无线电通知区特性

这项研究提出了确定在现场安装射电天文台并保护特别是在热带地区的射电天文频谱的无线电静区（RQZ）和无线电通知区（RNZ）的一般标准。这项研究的重点是人口密度中等的地区。世界上选择的大多数RQZ主要位于人口密度低的地区，而这项工作研究的是尚未研究的潮湿热带地区的射频干扰（RFI）环境。热带地区的湿度对无线电信号有重要影响，这为研究提供了独特的视角。这项研究实现了一种通过考虑重要的湿度因素对RFI水平进行建模的算法。根据RQZs标准选择理想的地点，而实际地点则基于RNZs标准。在马来西亚，确定了四个理想的候选地点和另外四个现实的候选地点，并进行了现场RFI水平测量。根据这项研究，建议在马来西亚将瓜拉特姆伯林（Kuala Tembeling）站点作为RQZ，将杰勒布（Jelebu）站点作为RNZ。