Direct Broadcast Satellite (DBS for short) is a point-to-point broadcast of video, image, text, and sound programs through satellites for direct reception by the majority of users. According to International Telecommunications Union (ITU) regulations, direct broadcast satellites generally belong to the broadcast satellite service (BSS). The frequency bands used should be the dedicated Ku band for broadcasting (my country belongs to Zone III of the Global Plan, with the upper line 17.3-17.8 GHz and the lower line 11.7-12.2 GHz) and the Ka frequency band (to be developed). The use of satellites for point-to-point program transmission, and the transmission of programs to terrestrial broadcast television or cable TV stations for rebroadcasting uses the fixed satellite service (FSS), using the communication frequency band, including the C frequency band and the Ku frequency band (the upper line is 14.0—14.5 GHz, the lower line is 14.0—14.5 GHz). Behavior 12.25-12.75GHz). Usually, people will use the Ku-band FSS to provide satellite direct-to-home-DTH (Direct To Home) broadcast and TV service called satellite live broadcast.
DBS (Direct Broadcast Satellite) and DSS (Digital Satellite System) are usually used interchangeably; however, DBS is the general name for a broadcasting satellite system that has been in operation since the early 1970s, and DSS is a name owned by Hughes Corporation Brand name. At present, most DBS systems directly provide digital TV broadcasts to users equipped with parabolic satellite antenna equipment. Companies involved in DBS include EchoStar, Gilat Satellite Networks, DirecTV (Hughes), News Corporation, Primestar and USSB (United States Satellite Broadcasting Corporation).
Although the DBS system mainly provides TV services, satellite Internet access is becoming increasingly popular. The following companies are involved in this field: DirecTV (Hughes)'s DirecPC system provides download speeds of up to 400kbit/s. This system will be discussed in the next paragraph. Cyber-star of Loral Space and Communications Ltd. is a two-way satellite service for commercial applications. The data rate is up to 27Mbit/s. The service provides IP multi-channel Guangluo, which enables companies to build extranets and perform large file distribution tasks to remote company servers. At the same time, the service also provides Internet access.
StarBand is a two-way satellite system with a download data rate in the range of 500kbit/s. The company has established partnerships with Gilat Satellite Networks communications, Microsoft Corporation and Echostar Communications. Teledesic Corporation is using low-orbit satellites to develop an "in-the-air Internet" system, which is expected to be completed in 2003. Funding for this project is currently provided by Bill Gates, Craig McCaw, Motorola and others.
Compared with communication satellites, DBS has the following advantages: (1) The power of DBS transponders is relatively large, currently generally above 120W or 240W, and the downlink EIRP can reach about 60dBW, and the ground field strength is evenly distributed, and the radio wave utilization rate is high. The family can use 0.5 Antennas with diameters below m receive.
(2) DBS is designed according to requirements to form multiple beams to cover the whole country, but because of its large coverage, it can also cover the whole country with a single beam, so the frequency utilization rate is higher. (3) DBS has relatively fast input and output, short cycle, and high efficiency ratio of investment standards.
(4) DBS can not be restricted by terrestrial frequency allocation (communication C band is interfered by microwave), and after adopting digital compression technology, it can double the program capacity within the limited transmission bandwidth. At present, DBS systems in many countries can broadcast data services and Internet services in addition to hundreds of TV programs.
(5) The coverage of DBS is protected by international conventions, and the coverage area of our country is not interfered by the overflow waves of other satellites, which is beneficial to resist the infiltration of overseas satellite programs.
DirecPC is a satellite-based Internet information access technology launched by Hughes Network Systems in the United States. The DirecPC system is based on the DirecTV system, through which users can use an 18-inch VSAT (Very Small Aperture Antenna Earth Station) installed on the roof or antenna to receive digital broadcast television signals. The improved 21-inch parabolic antenna can simultaneously access TV and data. The PC is connected to the parabolic antenna through an internal adapter or an external device connected to the PC's USB (Universal Serial Bus) port. Since the system is designed for downloading only, a separate modem connection is required to make a Web request, as shown in Figure D-17.
Please note that web requests (called upstream signals) are sent to the ISP via wires and then to the DirecPC NOC (Network Operations Center). NOC sends these requests to the corresponding web server on the Internet, receives the response, and then sends the response to its satellite, from where they are transmitted out of the customer's parabolic antenna at a rate of 400bit/s.
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How far(long) the transmitter cover?
The transmission range depends on many factors. The true distance is based on the antenna installing height , antenna gain, using environment like building and other obstructions , sensitivity of the receiver, antenna of the receiver . Installing antenna more high and using in the countryside , the distance will much more far.
EXAMPLE 5W FM Transmitter use in the city and hometown:
I have a USA customer use 5W fm transmitter with GP antenna in his hometown ,and he test it with a car, it cover 10km(6.21mile).
I test the 5W fm transmitter with GP antenna in my hometown ,it cover about 2km(1.24mile).
I test the 5W fm transmitter with GP antenna in Guangzhou city ,it cover about only 300meter(984ft).
Below are the approximate range of different power FM Transmitters. ( The range is diameter )
0.1W ~ 5W FM Transmitter ：100M ~1KM
5W ~15W FM Ttransmitter : 1KM ~ 3KM
15W ~ 80W FM Transmitter : 3KM ~10KM
80W ~500W FM Transmitter : 10KM ~30KM
500W ~1000W FM Transmitter : 30KM ~ 50KM
1KW ~ 2KW FM Transmitter : 50KM ~100KM
2KW ~5KW FM Transmitter : 100KM ~150KM
5KW ~10KW FM Transmitter : 150KM ~200KM
How to contact us for the transmitter?
Call me +8618078869184 OR
Email me [email protected]
1.How far you want to cover in diameter ?
2.How tall of you tower ?
3.Where are you from ?
And we will give you more professional advice.
About Us
FMUSER.ORG is a system integration company focusing on RF wireless transmission / studio video audio equipment / streaming and data processing .We are providing everything from advice and consultancy through rack integration to installation, commissioning and training.
We offer FM Transmitter, Analog TV Transmitter, Digital TV transmitter, VHF UHF Transmitter, Antennas, Coaxial Cable Connectors, STL, On Air Processing, Broadcast Products for the Studio, RF Signal Monitoring, RDS Encoders, Audio Processors and Remote Site Control Units, IPTV Products, Video / Audio Encoder / Decoder, designed to meet the needs of both large international broadcast networks and small private stations alike.
Our solution has FM Radio Station / Analog TV Station / Digital TV Station / Audio Video Studio Equipment / Studio Transmitter Link / Transmitter Telemetry System / Hotel TV System / IPTV Live Broadcasting / Streaming Live Broadcast / Video Conference / CATV Broadcasting system.
We are using advanced technology products for all the systems, because we know the high reliability and high performance are so important for the system and solution . At the same time we also have to make sure our products system with a very reasonable price.
We have customers of public and commercial broadcasters, telecom operators and regulation authorities , and we also offer solution and products to many hundreds of smaller, local and community broadcasters .
FMUSER.ORG has been exporting more than 15 years and have clients all over the world. With 13 years experience in this field ,we have a professional team to solve customer's all kinds of problems. We dedicated in supplying the extremely reasonable pricing of professional products & services. Contact email : [email protected]
Our Factory
We have modernization of the factory . You are welcome to visit our factory when you come to China.
At present , there are already 1095 customers around the world visited our Guangzhou Tianhe office . If you come to China , you are welcome to visit us .
At Fair
This is our participation in 2012 Global Sources Hong Kong Electronics Fair . Customers from all over the world finally have a chance to get together.
Where is Fmuser ?
You can search this numbers " 23.127460034623816,113.33224654197693 " in google map , then you can find our fmuser office .
FMUSER Guangzhou office is in Tianhe District which is the center of the Canton . Very near to the Canton Fair , guangzhou railway station, xiaobei road and dashatou , only need 10 minutes if take TAXI . Welcome friends around the world to visit and negotiate .
Contact: Sky Blue
Cellphone: +8618078869184
WhatsApp: +8618078869184
Wechat: +8618078869184
E-mail: [email protected]
QQ: 727926717
Skype: sky198710021
Address: No.305 Room HuiLan Building No.273 Huanpu Road Guangzhou China Zip:510620
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English: We accept all payments , such as PayPal, Credit Card, Western Union, Alipay, Money Bookers, T/T, LC, DP, DA, OA, Payoneer, If you have any question , please contact me [email protected] or WhatsApp +8618078869184
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We recommend you use Paypal to buy our items ,The Paypal is a secure way to buy on internet .
Every of our item list page bottom on top have a paypal logo to pay.
Credit Card.If you do not have paypal,but you have credit card,you also can click the Yellow PayPal button to pay with your credit card.
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But if you have not a credit card and not have a paypal account or difficult to got a paypal accout ,You can use the following:
Western Union.  www.westernunion.com
Pay by Western Union to me :
First name/Given name: Yingfeng
Last name/Surname/ Family name: Zhang
Full name: Yingfeng Zhang
Country: China
City: Guangzhou
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T/T . Pay by T/T (wire transfer/ Telegraphic Transfer/ Bank Transfer)
First BANK INFORMATION (COMPANY ACCOUNT):
SWIFT BIC: BKCHHKHHXXX
Bank name: BANK OF CHINA (HONG KONG) LIMITED, HONG KONG
Bank Address: BANK OF CHINA TOWER, 1 GARDEN ROAD, CENTRAL, HONG KONG
BANK CODE: 012
Account Name : FMUSER INTERNATIONAL GROUP LIMITED
Account NO. : 012-676-2-007855-0
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Second BANK INFORMATION (COMPANY ACCOUNT):
Beneficiary: Fmuser International Group Inc
Account Number: 44050158090900000337
Beneficiary's Bank: China Construction Bank Guangdong Branch
SWIFT Code: PCBCCNBJGDX
Address: NO.553 Tianhe Road, Guangzhou, Guangdong,Tianhe District, China
**Note: When you transfer money to our bank account, please DO NOT write anything in the remark area, otherwise we won't be able to receive the payment due to government policy on international trade business.
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* It will be sent in 1-2 working days when payment clear.
* We will send it to your paypal address. If you want to change address, please send your correct address and phone number to my email [email protected]
* If the packages is below 2kg,we will be shipped via post airmail, it will take about 15-25days to your hand.
If the package is more than 2kg,we will ship via EMS , DHL , UPS, Fedex fast express delivery,it will take about 7~15days to your hand.
If the package more than 100kg , we will send via DHL or air freight. It will take about 3~7days to your hand.
All the packages are form China guangzhou.
* Package will be sent as a "gift" and declear as less as possible,buyer don't need to pay for "TAX".
* After ship, we will send you an E-mail and give you the tracking number.
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For Warranty .
Contact US--->>Return the item to us--->>Receive and send another replace .
Name: Liu xiaoxia
Address: 305Fang HuiLanGe HuangPuDaDaoXi 273Hao TianHeQu Guangzhou China.
ZIP:510620
Phone: +8618078869184
Please return to this address and write your paypal address,name,problem on note: |
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