Up, can't go up, retreat, can't retreat.

Qin Feng was helpless.

Moreover, there is no signal.

But don't be afraid if you don't have a signal, and you have a satellite phone in the car.

What is a satellite phone, a satellite phone is a satellite communication system based on the satellite communication system to transmit information, that is, a satellite relay intercom. Satellite relay intercom is the product of modern mobile communication, and its main function is to fill the area that cannot 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, and all the communication functions provided by existing commonly used communication have been applied in satellite communication.

Since the successful launch of the first artificial Earth satellite by the Soviet Union on October 4, 1957, the world of mankind has been completely opened.

However, at this time, satellites could transmit communications, but they could not communicate with satellites.

This is because it does not have the ability to forward signals in real time. And not only the inability to make phone calls, but also the inability to transmit television signals.

What a satellite station, that's not there.

IT WAS NOT UNTIL 1965 THAT THE SOVIET UNION LAUNCHED THE MOLNIYA SYNCHRONOUS SATELLITE, WHICH COMPLETED REGIONAL COMMUNICATIONS 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, as well as the international environment, satellite communications could only be divided into regions.

The rest can't.

After all, one Warsaw Pact, one NATO, opposed to each other, how can it be possible for your satellite signals to spread wantonly in my area.

Therefore, it was not until the 90s, with the collapse of the former Soviet Union, that the official establishment of global satellite communications was established.

As for the advantages and disadvantages, they are quite obvious.

Compared with commonly used cable communication (fixed telephone) and microwave communication (mobile phone), the advantages and disadvantages of satellite communication are very obvious.

In a way, the communication distance is very long. As the saying goes, "the height of the station is the distance you can see," and synchronous communication satellites can "see" the earth with a maximum span of more than 18,000 kilometers. Any two points in this coverage area can communicate through satellites, and microwave communication is generally about 50 kilometers away from a relay station, 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 communications satellite can carry several to dozens of transponders, and can provide several channels of television and thousands of intercoms;

In addition, its communication quality is good and reliable. Satellite communication has few transmission links, is not affected by geographical conditions and meteorology, and can obtain high-quality communication signals.

And the use of flexible and adaptable. It can not only realize the communication between any two points on land, but also realize the communication between ships and ships, ships and shore, air and land, and it can form a multi-directional, multi-point three-dimensional communication network;

And the cost is relatively low compared to the cost of the service provider. Under the same capacity and the same distance, compared with other communication equipment, the cost of satellite communication system is less, and the cost of satellite communication system does not increase with the increase of communication distance, and the cost is still decreasing with the maturity of design and technology;

The disadvantages are also obvious. First of all, although the manufacturing cost is low, the 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 the tariff standard;

Second, if the device itself is obscured by objects such as large buildings or mountains, the communication signal is absent or flickering. Of course, at this point, it is also a disadvantage of mobile phone communication. It is the advantage of a fixed line.

The biggest disadvantage is that there is a delay during the call, resulting in poor connection. Of course, this has also been greatly improved with the advancement of technology.

However, at this stage, the call quality is still not so high.

Of course, compared to your own mobile phone with no signal at all, this satellite phone has a signal is already very good.

At the very least, Qin Feng can be asked for help.

Generally speaking, this kind of phone in the car is used as an emergency call nine times out of ten.

Therefore, the above are directly set up with one-key dialing.

Soon, there was a call over there.

"Hello, there was something wrong with my car and it broke down. Can you come to the rescue?" Lin Feng asked.

"Mr. Qin, our company provides a premium version of the luxury RV to provide customers with 24 hours a day, 365 days a year. In addition, the first year of breakdown towing service is included free of charge. The voice on the other end of the line was enthusiastic.

Qin Feng blinked.

Free first-year breakdown towing service, this is okay.

Originally, Qin Feng pondered, this time I asked someone to tow or something, I am afraid it will cost a lot.

But I heard that it's completely free, that's good.

You're welcome.

"Mr. Qin, where are you?" a pleasant voice came from the other side of the phone, "If you don't know, you can turn on the GPS satellite positioning system, so that our company can receive your location signal." ”

This kind of RV naturally carries a global positioning system, which is also convenient for rescue.

After all, the people who can buy this RV are rich people. The safety of their lives is naturally paramount.

But at the same time, their personal privacy is critical.

Therefore, in this regard, the company has set up an emergency rescue positioning system and a shield.

It is usually shielded by physical buttons. That way, no one can find you through this.

And when it comes to the necessary time, when rescue is needed, turn it on. The company will receive the information and come to the rescue.

At the same time, it can also play the role of an alarm device.

Once it is opened, it means that there is an urgent matter, and the company will definitely send someone to check the rescue.

"Okay, thank you. Qin Feng found the switch and pushed it down.

Soon, the satellite positioning system began to work, transmitting the information where Qin Feng was.

The company received a call from Qin Feng, and naturally it was also paying close attention.

Soon, this point of Qin Feng was displayed on their company's satellite system.

"W-why did this go so far!" the whole company was stunned, "It's all going to Canada, and it's so far." It looks like it's in the middle of the mountains. This, this, the cost of rescue will be very expensive!"

The whole RV company has a bit of a tingling scalp.

It's okay to say that this is going to break down on the road normally.

That's no problem. Even if it's far away, the nearest place in the local area, just rent a trailer to go there.

But if you have to go to the mountains, it will be troublesome.

That's a lot of money.

But the contract says that the service is serviced like this, so you have to go anyway.

But when the RV company sent a professional team over, before he met Qin Feng, his legs trembled when he saw the mountains.

This... It's a lot of fun.