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In this era, the role of telecommunications facilities is very important because of that we needed several components of good telecommunications support equipment. One of the most important components in telecommunications is the antenna to be used in the transmitter as well as receiver transmission system. The most widely used antenna is the Yagi antenna. In communication, especially satellite communication also uses Yagi antenna type Cross Yagi. This Cross Yagi Antenna uses different frequencies to distinguish the uplink and downlink processes. when the uplink uses the VHF frequency and the downlink uses the UHF frequency. This simulation is done to find out the changes that occur if there is a rounding of the size made during manufacture. Rounding on the antenna is done because at the time of manufacture it is not possible for someone to measure and cut the components precisely according to calculations. The test results indicate a change that occurs from the radiation pattern where the UHF antenna radiation pattern becomes leaner. In the Gain for UHF antennas it also changes where it becomes larger, while for beamwidth there is a calculation error wherein the simulation cannot designate 3 dB. Saat era ini peranan sarana telekomunikasi sangatlah penting sehingga diperlukan beberapa komponen alat pendukung telekomunikasi yang baik. Salah satu komponen yang sangat penting dalam telekomunikasi adalah antena yang digunakan pada sistem transmisi pemancar maupun transmisi penerima. Antena yang paling banyak digunakan adalah antena Yagi. Pada komunikasi khususnya komuniksi satelit juga menggunakan antena Yagi bertipe Cross Yagi. Antena Cross Yagi ini menggunakan frekuensi yang berbeda untuk membedakan proses uplink dan downlink . saat uplink menggunakan frekuensi VHF dan downlink menggunakan frekuensi UHF. Simulasi ini di lakukan untuk mencari tahu perubahan yang terjadi jika adanya pembulatan ukuran yang dilakukan saat pembuatan. Pembulatan pada antena dilakukan karena pada saat pembuatan tidak memungkinkan untuk seseorang mengukur dan memotong komponen dengan tepat sesuai perhitungan. Hasil pengujian menunjukkan adanya perubahan yang terjadi dari pola radiasi dimana pada antena UHF pola radiasi menjadi lebih ramping. Pada Gain untuk antena UHF juga berubah dimana menjadi lebih besar, sedangkan untuk beamwidth mengalami kesalahan perhitungan dimana pada simulasi tidak dapat menunjuk 3 dB.

Carbon monoxide (CO) gas can bind to hemoglobin in blood cells. Even if humans inhale CO gas at high levels, reaching 25 parts in a million (PPM) (PER.13 / MEN / X / 2011), the risk is death. Besides CO, there are other odorless and colorless gases, namely carbon dioxide (CO2). Exposure to high levels of CO2 concentrations reaching 1000 PPM or more can be bad (American ASHRAE 62-1989). Many individuals or groups in large buildings do not know the weather conditions outside because the building is too large and there are no windows to view the weather outside the building. This happens a lot in malls or large shopping centers. By utilizing the concept of internet of things (IoT) technology and Android applications, real-time remote monitoring can be realized.

This study aims to determine whether the lights on street lighting can be optimized by changing the lamp housing, LED electronic drivers and even the use of optical lenses to make lighting brighter and save energy. Assisted by a partner making street lighting by providing a few examples of experiments that have been carried out by these partners to be able to do an analysis of the products that have been produced and made by these partners. Its production is CSL14 code which has a tendency to use glass as a function to protect the LED chip, but it turns out the glass actually reduces the intensity of light. CSL19 code is starting to appear there is an update by using optical lenses with anti-dust and waterproof materials, it seems that the intensity of street lighting can be more optimally. CSL19 product is proven better than CSL14. Based on measurements it was found that the use of optics can increase optimization and lighting can be more scattered. The use of glass lampshades actually also proved to have worse consequences than the measurement of light intensity on CSL19. CSL19 products are equipped with LED driver technology that is able to do adjustable dimming so that the light intensity is proportional to the desired power.