Go, go, go, go, go.
Qin Feng was helpless.
And there''s no signal.
But I''m not afraid of no signal. I bring a satellite phone in the car.
What is satellite telephone? Satellite telephone is a talker that transmits information based on satellite communication system, that is, satellite relay talker. Satellite relay talker is the product of modern mobile communication. Its main function is to fill the area that can not be covered by existing communication (wired communication, wireless communication) terminals and provide more sound services for people''s work. In modern communication, satellite communication cannot be replaced by other communication methods. All communication functions provided by existing common communication have been applied in satellite communication.
Since the Soviet Union successfully launched the first man-made earth satellite on October 4, 1957, the human world has been completely opened.
However, at this time, although satellites can spread communication, they cannot carry out satellite communication.
Because it does not have the ability to forward signals in real time. And not only can''t make phone calls, but also can''t spread TV signals.
What satellite station? There''s no such thing.
Until 1965, the Soviet Union launched the "lightning" (Molniya) synchronous satellite and completed the regional communication and television broadcasting between the Soviet Union and Eastern Europe.
At this time, satellite communication can really be realized.
Of course, in this era, limited by the system at that time and the international environment, satellite communication can only be divided into regions.
The rest can''t.
After all, a Warsaw Pact and a NATO are opposed to each other. How can your satellite signals spread wantonly in my area.
Therefore, until the 1990s, with the collapse of the former Soviet Union, it led to the formal establishment of global satellite communication.
As for the advantages and disadvantages, they are also quite obvious.
Compared with common cable communication (fixed telephone) and microwave communication (mobile phone), satellite communication has obvious advantages and disadvantages.
In a way, the communication distance is very long. As the saying goes, "standing high, looking far", synchronous communication satellites can "see" the earth, with a maximum span of more than 18000 kilometers. Any two points in this coverage area can communicate through satellites, while microwave communication is generally about 50km. A relay station is set up, and the coverage distance of a synchronous communication satellite is equivalent to more than 300 microwave relay stations.
At the same time, satellite communication has many communication lines and large capacity. A modern communication satellite can carry several to dozens of transponders, and can provide several TV channels and thousands of talkers;
In addition, it has good communication quality and high reliability. Satellite communication has few transmission links, is not affected by geographical conditions and meteorology, and can obtain high-quality communication signals.
It is flexible and adaptable. It can not only realize the communication between any two points on land, but also realize the communication between ships, ships and shore, air and land. It can form a multi-directional and multi-point three-dimensional communication network;
And compared with the cost of service providers, its cost is relatively low. Under the same capacity and distance, compared with other communication equipment, satellite communication consumes less funds. The cost of satellite communication system does not increase with the increase of communication distance. With the maturity of design and technology, the cost is still decreasing;
The disadvantages are also obvious. First of all, although its manufacturing cost is low, its operating cost is not low. Therefore, the communication tariff standard is higher than the commonly used cable communication and microwave communication, which is ten times or even dozens of times of its tariff standard;
Secondly, if the equipment itself is covered by objects such as large buildings or mountains, the communication signal has no or flickers. Of course, this is also the disadvantage of mobile communication. Is the advantage of fixed line.
The real biggest disadvantage is that there is a delay during the call, resulting in poor connection. Of course, with the progress of science and technology, this has also been greatly improved.
However, at this stage, the call quality is still not so high.
Of course, compared with their own mobile phone, there is no signal at all. It is very good that the satellite phone has a signal.
At least, Qin Feng can ask for help.
Generally speaking, this kind of telephone in the car is used as an emergency call nine times out of ten.
Therefore, one touch dialing is directly set up above.
Soon, there was a call over there.
"Hello, there is something wrong with my car and it broke down. Can you come to the rescue? " Lin Feng asked.
"Mr. Qin, the exclusive luxury RV provided by our company provides customers with 24-hour service 365 days a year. In addition, the first year''s faulty trailer service is attached free of charge. " The voice on the other end of the phone was full of enthusiasm.
Qin Feng blinked.
Free first year Breakdown Trailer service, this is OK.
Originally, Qin Feng thought that it would cost a lot to have someone Trailer this time.
But I heard it''s completely free, that''s good.
You''re welcome.
"Mr. Qin, where are you?" A pleasant voice came over the phone, "if you don''t know, you can turn on the GPS satellite positioning system so that our company can receive your position signal."
This RV, naturally carrying the global positioning system, is also convenient for rescue.
After all, those who can buy this RV are rich people. Their life safety is naturally the most important.
But at the same time, their personal privacy is also crucial.
Therefore, in this regard, the company has set up an emergency rescue positioning system and shield.
It is usually shielded by physical keys. That way, no one can find you through this.
When necessary, when rescue is needed, turn it on. The company can receive the information and come to the rescue.
At the same time, it can also play the role of an alarm device.
Once opened, it means there is an emergency, and the company will send someone to check the rescue.
"OK, thanks a lot." Qin Feng found the switch and pushed it down.
Soon, the satellite positioning system began to work to spread the information of Qin Feng.
The company received a call from Qin Feng and naturally is paying close attention.
Soon, Qin Feng''s point was displayed on their company''s satellite system.
"Well, why did you run so far!" The whole company was stunned, "it''s all over Canada, and it''s so far away. It looks like it''s in the mountains. This, this, the rescue cost will be very expensive! "
The whole RV company is a little numb.
It''s easy to say that this should break down on the ordinary road.
That''s no problem. Even if it''s far away, just rent a trailer to the nearest place.
But it''s going to be in the mountains, so it''s in trouble.
The cost is high.
But the contract says this. The service is like this. You have to go anyway.
But when the RV company sent a professional team, before Qin Feng met, he saw the mountains and trembled with his legs.
It''s... Fun.