Atv Frequency Turksat

0 views

Skip to first unread message

Bethann Gendernalik

unread,

Aug 3, 2024, 5:14:31 PM8/3/24

to dumbtinfefi

A receiver antenna, an LNB and a satellite receiver are used to watch satellite broadcasts. Watching broadcasts trouble-free is possible only if the antenna is focused exactly to the satellite. Therefore, antenna must be installed by service professionals having sufficient technical knowledge and hardware. How an satellite antenna alignment can be checked and corrected without using any equipment will be clarified here.

While aligning the receiving antenna, the level of a weak broadcast signal of the satellite is taken into consideration. The signal level of the channel is followed by pressing the info of key of the controller. As a result of the movement in the specified direction, the highest signal level in that direction is found, so that the most convenient point in the relevant direction is determined for the antenna. The same procedure is held for the other direction and the highest level as well as the most convenient point in the relevant direction is found once again. So, the receiving antenna is become directed properly to the satellite. During these alignments, the screws used for fixing the antenna for each direction must be loosened and tightened back carefully without losing the strong signal obtained when the setup is over.

Caution: Before starting the alignment procedure, the horizontal and vertical position of the antenna must be marked with a pen in order not to lose the existing position of the satellite antenna. Thus, it would be possible to return to the starting point if the satellite signal is lost.

The next step is aligning the LNB (without moving the antenna dish) in order to fit the receiving mechanism into the satellite polarization In order to do this, a low strength specimen on the direction of any broadcast (for example horizontal) is chosen and the quality and level of the signal is checked. The level of the broadcast is followed by pressing the info of key of the controller. The LNB on the receiving focus of the antenna is rotated clockwise or counterclockwise while keeping the antenna fixed, so that the point where the level is maximum is determined.

Every LNB strengthens the received satellite signals and conducts a frequency conversion, and reduces the high-frequency satellite signals to low frequencies. The LNB mounted on the satellite antenna may lose its features in time because of various environmental conditions. Such an LNB may convert the frequency into a value a few MHz lower or higher than it should be. Such a situation may cause inability to display some channels even if the antenna is aligned properly. In case of a problem like this, the best thing to do is to replace the LNB. However, the following temporary solution can be used to overcome the problem until the LNB is replaced. All parameters of the broadcast are entered manually into the search menu of the receiver. When the receiver encodes the broadcast, the signal quality is noted before pressing the OK button. The entered frequency is increased by 1 MHz. The signal level is re-checked at this frequency change; if the level is decreased, then the frequency value is decreased. If there is a level increase in this direction, the entered frequency is decreased by 1 MHz. The point where the signal level is maximal is found and this frequency is used for the broadcast. In other words, the frequency is increased and decreased by 1 MHz at a time from the value it should be, and the point where the strongest signal is received is determined.

The cable connecting the antenna mechanism to the satellite receiver must be as short and good-quality as possible. As the cable gets longer, the strength of the signal reaching the satellite receiver gets weaker. If a very long cable is needed, a line amplifier can be used to amplify the signal level before the satellite receiver. Low quality cables may cause some problems such as too much attenuation of the signal and influence by various environmental factors like wireless telephones. Satellite receivers are unable to encode signals below a certain threshold.

The noise insulation of tuner layers of some satellite receivers may be weak. In such a case, the satellite receiver can easily be exposed to environmental impacts. When problems such as inability to receive some broadcasts particularly in old satellite receivers, it may be necessary to make a software update.

For an automatic update of satellite receivers according to Trksat TV/Radio broadcasts, the parameters of Trksat Introduction broadcast must be entered manually and the network search feature must be activated so as to start the search.

Cable TV is the transmission of analog and/or digital radio, televisions (TV) and data signals, for subscribers, coming from various carrier environments, after being merged and amplified, in the form of both digital packages and analog signals, through fiber and/or coaxial cable, so as to provide interactive communication. It is an infrastructure, through which internet, data, and interactivity services can be provided, thanks to its bandwidth, suitability to two-way communication, and Cable networks providing high-quality voice and image transmission and not being affected by frequency contamination.

TurkSat-3USat is a Turkish communications nanosatellite developed by the Space Systems Design and Test Laboratory and Radio Frequency Electronics Laboratory of Istanbul Technical University (ITU) in collaboration with the Trksat company along with Turkish Amateur Satellite Technology Organization (TAMSAT). It was launched on 26 April 2013.[2][3][4]

TurkSat-3USat was launched as a secondary payload on 26 April 2013 at 04:13:04 UTC atop a Long March 2D satellite launch vehicle from the Launch Area 4/South Launch Site 2 of Jiuquan Satellite Launch Center in Gobi Desert, China.[3][4][5] Further payloads on this flight were:[4][6]

TurkSat-3USat was placed into a Sun-synchronous low Earth orbit at an altitude of 645 kilometres (401 mi). It orbits 2-3 times a day over Turkey. The satellite's mission duration is expected to be at least three years.[3][4]

TurkSat-3USat is packed in a three-unit CubeSat[7][8] structure made by Innovative Solutions In Space BV (ISIS) from Delft, Netherlands.[4] It is 10 by 10 centimetres (3.9 in 3.9 in) wide and 34 centimetres (13 in) long, and has a mass of about 4 kilograms (8.8 lb).[3][5]

The satellite's payload, a linear transponder and on-board computer, were designed in the RF Electronic Laboratory of ITU.[2] It is Turkey's first indigenously developed satellite. TurkSat-3USat providing SSB/CW communication in amateur radio frequency bands.[3] The transponder input is 145.940-145.990 MHz and the output is 435.200-435.250 MHz. On 437.225 MHz is either a CW beacon or 9,600 baud Audio frequency-shift keying (AFSK).[6][7]

Solar panels and lithium polymer batteries together with super capacitors provide the required power. Passive magnetic attitude control system with hysteresis rods enable satellite stabilization. A C329 UART camera module is available on board for occasional snapshots of Earth.[4][6][7][8]

The radio frequency designs of some antennas and microwaveequipment that will enable communication with Turkey's firstindigenous communication satellite, TURKSAT 6A, were realised atYashar University.

The TURKSAT 6A project, aimed at further advancing the country'scapabilities in the space domain, was carried out in collaborationwith TUSASH, ASELSAN, TUBİTAK UZAY, and CTech. Speaking aboutTURKSAT 6A in recent days, Transportation and InfrastructureMinister Abdulkadir Uraloğlu announced that the satellite's workhad been completed, and the satellite, which would depart for theUnited States in early June, would be launched into space betweenJuly 8 and 14.

While 90% of the satellite, made entirely with domesticproduction, is under the responsibility of CTech, the radiofrequency designs of some antennas and microwave equipment in theTelemetry Telecommand and Ranging (TTM) Subsystem were done byProf. Dr. Mustafa Sechmen and his team from the Department ofElectrical and Electronics Engineering at Yashar University.

Based on the radio frequency design, the mechanical design,production, and all tests of the equipment were carried out byCTech. The equipment, integrated into the satellite along withother equipment in the subsystem, successfully passed system-leveltests and is ready to be launched into space in July.

Prof. Dr. Sechmen, discussing the work carried out in thelaboratories of the Department of Electrical and ElectronicsEngineering at Yaşar University within the scope of the"Development and Production of the TURKSAT 6A IndigenousCommunication Satellite" project, said, "The TTM Subsystem on thesatellite, especially, performs some critical functions, includingenabling communication between the satellite and the ground stationuntil the satellite reaches the geostationary position about 36,000kilometres away from the Earth and throughout the satellite'slifespan of over 15 years. The TTM Subsystem is responsible forensuring communication between the satellite and the groundstation, transmitting all commands sent to the satellite, andreceiving all data from the satellite. Since all communication withthe satellite is via the TTM Subsystem, the performance of thissubsystem is crucial for the control, management, and observationof the satellite."

"With this project, where Prof. Dr. Mustafa Sechmen contributedwith his previous expertise in radio frequency designs, we have hadthree projects related to space at our university. A specialantenna was produced according to the frequency design of theantenna and communication radio. System tests were alsosuccessfully completed, and we are awaiting its launch into space.The designed parts are significant because during the launch of thesatellite, communication will solely rely on this antenna, and allcommunication processes from the launch of the satellite to itsorbit insertion will be conducted through this antenna. Therefore,we attach great importance to this study and congratulate him."