scholarly journals Radio Interference in Astronomical Observatories of China

2001 ◽  
Vol 196 ◽  
pp. 307-310
Author(s):  
B. Peng ◽  
R. Nan ◽  
T. Piao ◽  
D. Jiang ◽  
Y. Su ◽  
...  
Keyword(s):  
Mobile Phone ◽  
Radio Astronomy ◽  
Power Supply ◽  
Earthquake Activity ◽  
Radio Interference ◽  
Worst Case ◽  
Radar Systems ◽  
Astronomical Research ◽  
Interference Problems

We first very briefly introduce the major radio facilities for astronomical research in China, and then report on the present interference situation at major radio observatories. Some of the radio interference problems are caused by paging services, mobile phone satellites, telemetry services for power supply, waterpower and earthquake activity, or radar systems, but some causes are unknown. In the worst case, harmful to radio astronomy, the Sesan VLBI station has not been able to do any observations at 92 cm due to serious radio interference problems since 1992. Still more serious interference coming from satellites can be expected in the next decade. International efforts on frequency protection should be urgently pursued if ground-based radio astronomy is to survive.

Development of Remote Control System for Residential AC Power Supply Based on GSM Technology

2016 ◽  
Vol 818 ◽  
pp. 169-173
Author(s):  
Muhamad Syukri Md Noh ◽  
Yanuar Z. Arief ◽  
Nor Asiah Muhamad
Keyword(s):  
Control System ◽  
Remote Control ◽  
Mobile Phone ◽  
Power Supply ◽  
Low Voltage ◽  
Assembly Language ◽  
Remote Control System ◽  
Ac Power ◽  
Message Service ◽  
The Status

The present study deals with the development of remote control system based on the Global System for Mobile Communication (GSM) technology for switching the low voltage AC power supply system at residential consumer. Function of this system is to disconnect and reconnect the electricity supply to consumers. The introduction of the GSM technology and particularly the use of hand-held mobile phones has brought the innovative distance communication to remote locations. This utilization of this technology for the remote control of systems and appliances will make life easier, safe and quick from anywhere. GSM module was used for receiving short message service (SMS) from user’s mobile phone that automatically enable the controller to take any further action such as to switch on and off the consumer load at the incoming power supply. The system was integrated with microcontroller and GSM network interface using assembly language. AVR Studio 4 software was utilized to accomplish the integration. The system is activated when user sends the SMS to GSM controller circuit at electric meter consumption panel board. Upon receiving the SMS command, the microcontroller unit then automatically controls the incoming power supply by switching on or off the device according to the user command. In other words, the developed system reads message from the mobile phone and responds to control the devices according to the received message. The system can also give feedback to the user to inform the status of switching operation if such command is received.

scholarly journals Status of the Thai 40-m Radio Telescope

2017 ◽  
Vol 13 (S337) ◽  
pp. 346-347
Author(s):  
Phrudth Jaroenjittichai
Keyword(s):  
Radio Telescope ◽  
Radio Astronomy ◽  
Time Domain ◽  
Phased Array ◽  
Low Frequency ◽  
Great Leap ◽  
Great Leap Forward ◽  
Astronomical Research ◽  
L Band ◽  
K Band

AbstractSince the first light of the 2.4-m Thai National Telescope in 2013, Thailand foresees another great leap forward in astronomy. A project known as “Radio Astronomy Network and Geodesy for Development” (RANGD) by National Astronomical Research Institute of Thailand (NARIT) has been approved for year 2017-2021. A 40-m radio telescope has been planned to operate up to 115-GHz observation with prime-focus capability for low frequency and phased array feed receivers. The telescope’s first light is expected in late 2019 with a cryogenics K-band and L-band receivers. RFI environment at the site has been investigated and shown to be at reasonable level. A 13-m VGOS telescope is also included for geodetic applications. Early single-dish science will focus on time domain observations, such as pulsars and transients, outbursts and variability of maser and AGN sources.

scholarly journals Interference Problems and Radio Astronomy in the UK

1991 ◽  
Vol 112 ◽  
pp. 267-272
Author(s):  
R. J. Cohen
Keyword(s):  
Radio Astronomy ◽  
Small Island ◽  
Frequency Bands ◽  
Current Sharing ◽  
The Uk ◽  
Interference Problems

ABSTRACTThe radio regulations often require frequency bands to be shared between radio astronomy and services which transmit. This poses severe problems in a small island, given the sensitivity of radio astronomy receivers. The survival of radio astronomy in these circumstances depends on wide awareness of the problems. Some of the current sharing problems in the UK are discussed.

scholarly journals SNOW MICROWAVE REFLECTION AT MOBILE PHONE FREQUENCY BANDS

2017 ◽  
Vol 1 ◽  
pp. 156 ◽  
Author(s):  
Tarmo Koppel ◽  
Inese Vilcane ◽  
Piia Tint ◽  
Andrei Shiskin
Keyword(s):  
Risk Assessment ◽  
Mobile Phone ◽  
Electromagnetic Fields ◽  
Reflection Loss ◽  
Mobile Communication ◽  
Case Scenario ◽  
Worst Case ◽  
Fresh Snow ◽  
Microwave Reflection ◽  
Snow Precipitation

Snow should be accounted in electromagnetic fields' risk assessment, especially in Nordic countries where in winter months snow precipitation and coverage may significantly affect the propagation of microwaves. The risk assessment should be always carried out under worst case scenario conditions, including the reflective properties of the surfaces surrounding the antenna. In this study fresh snow microwave reflectance properties were investigated at the mobile communication bands from 1700 to 2700 MHz.The investigation revealed that reflection loss from snow is more dependent from the frequency than from the thickness of snow coverage. Amongst mobile communication bands, the strongest microwave reflection (reflection loss only 3.2dB) was registered at WiFi2G band. Averaging all the snow thicknesses, the highest reflection loss occurs at GSM1800UL (1710-1785 MHz) and UMTS2100DL (2110-2170 MHz) bands. The least attenuation of reflection occurs in adjacent DECT band.

scholarly journals Educating the Public About Interference to Radio Observatories

2001 ◽  
Vol 196 ◽  
pp. 377-384
Author(s):  
David G. Finley
Keyword(s):  
Water Pollution ◽  
Environmental Protection ◽  
Radio Astronomy ◽  
Cultural Safety ◽  
Light Pollution ◽  
The Public ◽  
Engineering Measures ◽  
Astronomical Research

Educating the public about interference to radio observatories is a different and more difficult task than educating the public about light pollution. Convincing and successful arguments against light pollution can be based on aesthetic, economic, cultural, safety and security considerations without relying solely on the need to preserve the environment for astronomy. In contrast, it is necessary to first convince members of the public of the value of radio astronomical research before making the case for interference protection. Once this is done, arguments about interference must be presented in ways understandable to a public that is, by and large, woefully uninformed about the technology involved. Successful approaches often borrow from the language of environmental protection and draw parallels to such issues as air and water pollution in justifying the expense of engineering measures to protect radio astronomy.

scholarly journals The Legal Defense of Radio Astronomy

1991 ◽  
Vol 112 ◽  
pp. 310-317
Author(s):  
James G. Ennis
Keyword(s):  
Remote Sensing ◽  
Radio Astronomy ◽  
Primary Objective ◽  
Space Research ◽  
Radio Interference ◽  
National Academy Of Sciences ◽  
Wildlife Tracking ◽  
Radio Frequencies ◽  
Legal Defense ◽  
Academy Of Sciences

The purpose of this paper is to describe one program of the National Academy of Sciences’ Committee on Radio Frequencies (“CORF”). This program uses legal means to protect radio astronomy frequencies from radio interference.CORF is composed of eminent scientists from the fields of radio astronomy, space research, remote sensing, meteorology, and wildlife tracking who use radio frequencies in conducting their research. CORF’s primary objective is to limit the level of harmful man-made interference in the bands used by these scientists as much as possible.

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