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Open this topic Li strabismus reads and has love Ostlaa and learn more about the
And, God willing, satellite channels idea you like it and you benefit from them.
First: the dish Dish AA
Function dishes: _
Dish function is to collect signals from the satellite downlink and reversed to the center of the dish .. The quality of the dishes depends on several elements including: -
Type of material is it made of dish
Regularity or match the center of the dish with arms that accumulate in these focus
Severity and coating the dish
This is regardless of Qatar dish determined by the buyer's desire to see the moons with a specific radiation power .. For
For example: -
* Signals coming from the moon Nilesat power up in Egypt to more than 50dBW which allows receiving dish diameter 50 cm ..
* Moon Arabsat Referring force arrives in Jordan from 35 to 43 units, which requires the use of a diameter of 160 cm dish minimum .. (This is an example .......)
* Satellite Hotbird necessary dish 90 cm in diameter because the signal strength in Egypt up from 40 to 44 units .. these are examples ....... just to change my
Generally, the lower the signal strength increased the need for larger diameters of the dish.
Ore processing dish: _
Of the most important elements of the quality of the dishes to be dish stuff of great strength reverse .. The best material is aluminum for excellence in this property ..
Experience has been manufacturing a dish of raw fiberglass but it proved unsuccessful for several reasons, including the lack of resilience to weather and sun ..
Then comes dishes made of metal but is solid (the retina) and despite the reduced capacity to reverse signals as strong as solid dishes, but It is characterized Besmudha forward wind, especially in the coastal areas, which are often exposed to weather storms.
The focus of the dish: _
May be ore manufacture a very good dish, but manufacturing the same wretched, we find that reception is weak or confused ..
Although there are a large number of factories producing dishes to Anjad more manufacturers or three only produce these dishes efficiently, because there are so-called Balasitmbh - a high-priced - which is the normalization of the dish it and then if Alasitmbh well-made and very precise produces dishes regularly surface and with Focus is set ..
The manufacturing here is not only on the surface of the dish, but also in the arms riding them and meet in focus specific, if were not the arms and bends minute measurement will not apply the assembly point (position Alvedhorn) on focus and therefore are not receiving signals Home strong, but will receive the signals side weak .
Paint Type: _
Some might think that any coating applied is just to add an attractive appearance it .. But the truth is that there are kinds of large-capacity coating to reflect the electromagnetic signals that fall out of the satellites; thus help to reverse as much as possible from the signals and prevent it from leaking through the dish.
Flat dish: _
Different modus operandi flat dish for ordinary shower in that it does not reflect the signals but absorbs these signs located on the cell surface heading to reach their enlarged reference to the LNB unit installed behind him ..
It must be the LNB unit of kind Almajntek where you can not put Vidhorn (which change the function cati as he does not receive signals strength of less than 40 units).
Any dishes better?!
Plant can not be determined to better than the other dishes on the whole .. But we can say that each plant is characterized by a certain size of dishes ..
- Second: LNB LNB
Function and LNB: _
Summarized and function modules LNB capture signals coming from satellites and converted to become a television pictures .. What do the LNB unit signs affects it in its journey to the screen ..
The unit LNB converts bearish signal in the image of electromagnetic Microwave signals to electrical signals and then enlarge and then converted to the correct frequency borders with reducing the amount of LNB during these operations to as little as possible ..
The trade-off between quality and the LNB units that receive bandwidth per depends on the amount of the reduction factor of LNB (a ratio between the percentage Chocrh reference within to Chocrh ratio signal emerging from the LNB, measured in dB) ..
And you must know that the lower the coefficient, the better .. For example LNB Ku-Band with 0.6dB coefficient, which is the best of the old with laboratories 0.8dB ..
Also must also know that this factor, which usually writes on the LNB unit is not accurate in any way, there are two units are equal in this parameter, even if they were from the same factory .. More than that, this figure varies from one frequency to another frequency, in the sense that in the frequency 11250 Factory may be 0.6dB but in frequency 11600 differs be 0.7dB for example, and the number written on the unit is the average coefficient of LNB in the frequency range, which would face ..
Therefore it is clear that one of the defects complained of some They buy the best kinds of LNB low-labs 0.6dB However reception is fuzzy and less quality of a friend uses a coefficient 0.8dB .. There is no way to make sure this parameter, but the individual measurement of each unit separately by expensive device (about 30 thousand dollars)!!.
Classification of the units LNB: _
Units can be classified LNB into three main categories commonly used.
Units C-Band: -
These units receive signal contained in the package C-band and measured coefficient LNB labs thermal There 25K and 20K and 17K and 14K range frequencies within it from 3.7 to 4.2 GHz either frequencies beyond them into the receiver ranges from 950 to 1450 MHz and this number is the frequency IF on the receiver either the RF frequency is the same number subtracted from 5150 ..
And this unit can be installed without Vidhorn but it does not allow polar change from horizontal to vertical, a basic function of Vidhorn.
Units Ku-band: -
Receives signals contained in the Ku-band package, but within the limits of frequencies from 10.95 to 11.70 GHz graduated electrical signals to the receiver at frequencies in the range of 950 to 1700 MHz and this Houtrdd IF either RF frequencies are added 10000 .. And these units should be installed on Vidhorn (single or double) .. And LNB coefficient ranges between 1dB and 0.6dB.
Units Wide Ku-Band: -
And called units LNB broad term and receive signals contained in the package Ku-band, but within the limits of higher frequencies which range from 10.70 to 12.75 GHz to be converted to frequencies received by the receiver of 950 to 2150 MHz frequency the IF either calculates frequencies RF is added 10,750 .. And LNB coefficient ranges between 0.9dB and 0.6dB.
Modern specifications: -
The above-mentioned categories require Vidhorn to change the polarity between the horizontal and vertical .. He developed several types of units LNB for example (El Universal ماجنتيك) different brands ..
Features of this kind by including on Vidhorn in one unit and receives signals space Cioband and Allowaad Cioband and navigate between them by control pulses produced by the receiver
(22 over the low and zero for the higher) are also changing the polar feeding effort (14 volts for vertical and 18 volts for horizontal) ..
Classifications mentioned above are considered unilateral Single LNB produces some factories other types of bilateral Twin LNB and triple Triple LNB and quartet Quatro LNB sense can be connected to the same unit of the LNB to two reception or three devices or four devices and these units suitable for networks central SMATV ..
As the digital age has become the use of the LNB is concentrated in the private Almajntek both C-Band beam or and Aadcioband.
Third: feedhorn (Alvedhorn) Feedhorn
And function Alvedhorn: -
The basic function of Vidhorn is to collect the reflected signal from the dish and connected to the LNB unit with Polar choose .. Therefore, unnecessary Alvedhorn in the case of using LNBs LNB Almajntek can manage the Arctic from within .. But in case of using regular LNB (Cioband or and Aadcioband) can not dispensing Alvedhorn.
Description Alvedhorn: -
Consists Alvedhorn common use of three sections:
* First Section: concentric circular rings collects signals reflected from the surface of the dish ..
* Second Section: cylinder Alvedhorn which are combined carrier reference to the LNB unit, and this section him Tsamaman ..
The first is moveable cylinder and is known as the Adjustable Scaler Rings and thus put the cylinder can be set for circular rings ..
The other type is a fixed cylinder not change ..
In none of the Altsamamin remains the relationship between a vicious circle of Vidhorn and focal length to diameter dish correctly, ranging from 0.33 and 0.45 by Qatar and the depth of the dish the more the depth of concavity of the dish bigger must be along the cylinder Alvedhorn longer by adding a brass in nozzle with Alvedhorn adjustable position on the 0.36 in gradation cylinder ..
* Section III: Motor Prescribed Motion is associated router signals (polar needle) which controls the passing reference to required polar and related Motor Prescribed Motion receiver through 3 standard colors of wires
"Red and related Pal 5 volts - white and connects PULSE - Black and connection Ppalardy".
Types Alvedhorn: -
There are different types of Alvedhorn depending on the type of signal required to receive the most important C-Band and Cioband .. These types are:
* Vidhorn unilateral special reception signals only Elsie Band ..
* Vidhorn unilateral special reception package Cioband signals or and Aadcioband ..
* The most common type is bilateral Alvedhorn C * KU, which receives signals packages CNN and Cioband together ..
* There are types of of bilateral Alvedhorn to receive signals one package such as bilateral Alvedhorn C * C
And is used for installation of two polar LNB, one for horizontal and the other vertical polarity,
Hence he does not servo motor to change the polarity, and use this type of networks to satellite Bai Alqtabtin one dish.
Differentiation between kinds Alvedhorn: -
Natural that confused the buyer in the best species that are bought .. But that happens in Europe, either in Arab countries there is no broad selection ..
Where not available in the market ....... For example only Markian Vidhorn bilateral are Cabaral (which is better when the U.S. industry was) and Albansat ..
As Alvedhorn unilateral increases on these Almarkian Gardner brand.
With the entry of the digital age has become the installation Alvedhorn is important where polarity is changed from the LNB Almajntek addition to near the end of the era of broadcast package of the type C-Band.
Important note ..
Some people resort in order to save expenses to install unilateral Vidhorn of your LNB Cioband beam and installation of C-Band LNB on the elbow and this causes weakness receiver channels with different polar ..
Faulty installation for Alvedhorn site on its axis causing no major advantage of the functions of Alvedhorn we believe that polar control through the receiver differs from one device to another ..
It faults that afflict Alvedhorn inability to change the polar or delay in doing so .. Due to the link "X" Polar needle which resists the movement of the motor becomes a heavy .. Or damage Motor Prescribed Motion necessitating change another Bmutur.
Fourthly :: motor (arm movement) Actuator
Motor of the basic components for mobile systems .. And cause the movement to stop the simplest dish causes may lead to burning fuse or circuit nutrition .. The up holidays to the curvature of the arm himself or dish stopped at one end of the Arc, east or west .. There are two types of arms movement (motor) ..
The first type: vertical motor sizes and different sizes - is the most widespread and common -
Type II: Motor H / H (from horizon to horizon) .. .
Vertical motor: -
A cylindrical column internal moves vertically within a fixed cylinder by a small motor is fed circuit voltage of 36 volts derived from a receiver .. The group load Mount dish convert the vertical motion of the cylinder internal to the semi-circular movement and which charts the path of movement of the dish east and west ..
There are several sizes of motor starting from the vertical size 8 inches, 12, 18, 24, 36 inches to fit the size of the dish .. Vatabq diameter 90 cm does not have more than 12 inches while the dish with diameter 240 cm needs to be 24 inches .. The 240 cm dish needs to motor 36 inches to give him more strength and breadth of Arc and avoid some faults.
And connects the motor to a receiver device during the four wires:
* The first M1 and second M2 and function electric motor feed Vtthrk cylinder internal to the bottom or top, causing rotation of the dish east or west.
* The third wire is plugged Ppalardy.
* Fourth wire connection Balhassas Sensor is that calculates the number of electrical impulses reaching the motor until it stops movement by programming device.
Vertical motor problems: -
The biggest problems faced by the motor vertical be due to installation errors that cause a lack of turnover Ark satellite dish or not returning to its former satellite sites stored in the receiver or a change in the value of the corner anchored (Elevation) and geographical south ..
There are many reasons, such as: -
* Movement is a court of cylinder inner arm because of not putting enough of the nuts or roses in places installation ..
* Internal corrosion cylinder or the inner ring of the cylinder due to the non-use Bearings installation ..
* The entry of water into the arm due to erosion of the condom between internal and external cylinder Motor faults that afflict the motor ..
There malfunction affecting the motor because the limit is exceeded the eastern or the western Motor through the receiver; where there is inside the motor brushes separating electricity for when the arrival of the motor to the maximum or minimum height for him, If the badminton close the extent of arm movement motor is less well if badminton distant or missing the arm movement continues to fall dish at one end of the end of the Arc.
Motor H / H: -
Also called Almattur a polar movement because he moves between the poles or dish from the eastern horizon to the western horizon .. It achieves a wider range of arc vision (ARC), which moves him dish from east to west and can be considered the movement semi-circular equals 180 degrees and this means access corner anchored the dish to zero on both sides of the end of the movement which is actual fact, as up to 5 degrees only ..
Works Motor H / H theory different from the motor as vertical movement depends on a box of gears .. Also, this motor can not be installed on any dish, but he does dish specially with a factory movement Mount allows the installation of the dish on this motor.
RS232 cable
Cable is normal (rectum) Cyril DB9 RS232 cable
This cable is sold generally have computer shops
It was used in the previous modem connections or connect computers with each other
The delivery method as follows
1 ----------------------- 1
2 ----------------------- 2
3 ----------------------- 3
4 ----------------------- 4
5 ----------------------- 5
6 ----------------------- 6
7 ----------------------- 7
8 ----------------------- 8
9 ----------------------- 9
This cable is still working on a large proportion of Receivers
The second cable (cross)
Is agent Noel Cable modem or labeled my crossover cable cross cable
The advantage of this cable me to send and receive information, which several connections, including normal or الهاند check Handshake
And Tusilth as follows: _
2 ----------------------- 3
3 ----------------------- 2
5 ----------------------- 5
Some Receivers preferably connected to my following wiring, called me Phil Haandashak
2 ------------------------ 3
3 ----------------------- 2
4 ----------------------- 6
5 ----------------------- 5
6 ----------------------- 4
7 ----------------------- 8
8 ----------------------- 7
In the absence of a connection serial cable or that the port does not work
There connect me DB 25 Alborntr connection is working its own cable as follows
Receiver port DB25
7 ------------------------ 5
2 ------------------------ 2
3 ------------------------ 3
5 ------------------------ 7
4 ------------------------ 8
6 ------------------------ 4
20----------- ----------- 6
It is noted that the other is trying to find out the wiring does not care
How it works wiring or why!!?
No. 2 with three connectors and three with two
Ext dedicated to specific work and wiring or enmities pin know globally
How it works and also wiring and work rules and Astandr
No. (1) Provision for knowing reference
(2) dedicated to receive information
No. (3) Provision for sending information
(4) Provision for termination signal
(5) ground
(6) Provision for the reference
No. (7) dedicated to the request to send signal
No. (8) Provision for Bjahzh transmitter signal
No. (9) Index circle
The trade-off between quality and the LNB units that receive bandwidth per
Depends on the amount of reduction factor LNB
(A ratio between the percentage Chocrh reference Dakhla
To Chocrh ratio signal emerging from the Lnb measured in dB)
And you must know that the lower the coefficient, the better
Also must also know that this factor, which usually writes on the unit Lnb not accurate in any way, there are two units are equal in this parameter, even if they were from the same factory
The number written on the unit is the average coefficient of LNB in the frequency range received by
Sources of interference to the reception
Treat poor reception in the charged atmosphere microwave interference
Overlap means receiving any signal unlike to those you want to receive may be sourced naturally or artificially or a mixture of them and enter into the composition frequency, geographical location and time to happen some sources limited influence, others depressing annoying and must be careful and not to confuse the overlaps and cases that cause the results similar to the overlap and recall including the small diameter dish or twice to send the moon himself or obstructions such as tall buildings or dense trees that hinder the line of sight from the dish to the moon.
The cordless phones, computers and microwave ovens and units constant current and switches and disconnect the power cord and fluorescent lamps and mobile phone networks and radar and ground radar airborne equipment and military equipment of electronic sources of interference to the reception and were limited influence * Although the devices amateur radio, which sends short-wave and the fm do not operate in the frequency range of the satellite receiver, but it is one of the sources of interference also if its signal intensity was high
And prefers to keep those influences away from the receiver and Cable Delivery
You can also connect the receiver Ppalarda us to avoid the effects of
Constitute cases of overlap in the range of C C for about 80% of the total number of cases suffered by satellite viewers and severity depends on the dimension or the proximity of the source
This overlap is one of the worst cases infect reception space where microwave signals collide strong edges of the dish and reflected Kashaaat side collected feedhorn with Maijmah of signals reflected from the surface of the dish and passes it to the mixing stage and zoom as one lost signal weak satellite signals
And used in the treatment of this case sorbent interference filters and berms and Maiatkd it enough to repel
The best solution to the viewer, which is located reception system has charged atmosphere microwave interference
When can not receive frequencies Moon required or some frequencies in phase fixtures because of the occurrence of the dish in the area of influence network Microwave close operate in the same frequency band, the re-installation of the dish positioned low Maamkn prevents the entry of microwave deployed with reference reflected from the surface of the dish to focus into the trumpet Nutrition * Results confirmed and cost do not remember * As a general rule should not install dishes above the high-rise buildings because it is exposed to direct interference from microwave deployed on the rise
If possible put the dish between two buildings Veraay mounted so that it is closer what can be the highest building
When there Sater (a building or a fence or wall 000 etc.) and knowing the direction of the waves overlap Ground be there
Opportunity to solve the problem
Replace the dish in another place so that curtain (building or a fence or wall 000 etc.) between him and the path signal interference * but it is not an ideal solution because the signal interference dating back to the surface of the dish by reflection and rebound after colliding barricades * Results are better if Maamkn surround dish all directions, leaving open towards the moon, which receive him breadth by 6 degrees to the east and the likes of the West * If complicated things we did not find mounds or buildings there's still no solution to shielding interference brief the dish tires of metal from aluminum or steel above the dish by 100 cm and is proved by the wire
