Chapter 72

Due to the unknown interstellar orbit of the greater Mozambique, satellite communication is temporarily unavailable.

In this case, there are only two ways to achieve signal transmission in a short time:

Set up relay points or radio beacons.

as everyone knows.

When microwave and ultrashort wave are used to transmit signals, when the distance between the two terminal stations exceeds the line of sight.

The signal will begin to decay rapidly, so the signal quality cannot be guaranteed.

The relay station refers to a station set up between two terminal stations.

After amplifying, shaping and carrier frequency conversion, the relay station forwards the signal sent by the previous station to the next station.

In this way, the communication distance can be extended and better communication quality can be maintained.

At the same time, considering that the caravan will start in ten days, the ground relay station basically doesn't need to think about it.

Therefore, there are only two possible relay modes:

Drones or high-altitude balloons.

The most impractical of these two methods is UAV relay.

The height of the UAV relay is 300-2000 meters, and the use range is within 200 kilometers - for example, the UAV relay is used in the exploration of xiaolianzi mountain in the camp.

However, when the distance reaches more than 1000 kilometers, the UAV relay is somewhat unstable.

After all, there are a lot of people who can fly in the Mo world.

During the foundation period, the height of full lift off can be close to 300 meters, and jiedan territory can reach 1-5000 meters according to the realm.

These friars are not star players. They have good eyesight.

Who knows if they will send a flying sword to blow up the drone when they see it - rabbits don't worry about the exposure of the drone. After all, technology and Xiuzhen are two very different civilizations.

Based on the cognition of the indigenous people in the world of Da mo.

When they see such mechanical instruments as UAVs, they will at most think that they are a magic instrument instigated by a family.

However, once a UAV is captured or hacked, its relay function will completely disappear, and the signal transmission will completely fail.

The same is true for balloon relay.

Rabbits are not very advanced in balloon relay technology. The number of relay balloons needed for 1000 kilometers is at least 11 - the bear next door can achieve seven for 1000 kilometers. This is also one of the few communication technologies next door that are better than us.

Therefore, after excluding the two relay means, the only thing left is the radio beacon.

Radio beacon communication is actually a very complex thing, and its propagation characteristics are determined by the frequency characteristics used.

In short, there are thousands of kilometers of long wave and hundreds of kilometers of medium wave. Short wave can reach the world through ionospheric reflection. Frequencies above ultrashort wave can only be transmitted in a straight distance.

Sometimes, because a mountain is a Pandora's standard unit higher, the communication signal may be greatly affected.

Considering the distance between cities, there are only two feasible bands:

Long wave or short wave.

The short wave needs to be reflected through the ionosphere, but unfortunately, the camp still knows little about the ionospheric characteristics of the greater Mozambique boundary.

After all, there are three suns in the sky. It's hard to say anything about high-energy particles - in an unknown world, the starry sky is really not a field that can be solved at once.

Therefore, when the above possibilities are excluded, there is only one possibility left:

Radio transmission using long waves.

It is still well known.

Long wave refers to the radio wave with frequency below 300kHz and wavelength of 1000m ~ 10000m.

There is no doubt about the transmitting ability of long wave band, but there is a very, very troublesome problem in its erection——

That is, it needs a very huge long wave antenna array, which is more than ten ears... Forget it, change one this time, which is hundreds of times larger than the second generation of ten fish people.

This antenna array is so huge that even rabbits are not willing to build it wantonly - in our country, long wave is generally used in ocean industry.

Well, we don't know about the ocean industry, big black fish, small flat top or anything.

"Ten days... I don't know if it's enough."

Lin Li pressed his temple with his thumb joint, which is another very important event after the double headed cow.

Considering that the trip of the caravan may involve the next battle, and the antenna array is not determined by the camp, Lin Li hurriedly wrote a report and Lin Ziming personally sent it back to the magic capital.

Three hours later.

Lin Ziming came back with a new pinhole... Ah, no, a new instruction:

The core layer will secretly transport a set of 40m double curved reflector antenna array from jiaoao city. Since there is no radio interference means in the Mozambican boundary, the farthest communication distance of this array can reach 3600km.

This antenna array covers an area of about 2560 square meters. It is completely possible to build and debug it in ten days. (I spent an hour checking up all the public array data in the country. The rubber and Macau had just returned to the warehouse for a year, and there was no disassembly found. After it was finished, the assembly time was 400 people spent 17 days. After assembly, it took 33 hours to debug the assembly. It would be reasonable to reduce the number of manpower to ten days.

At the same time, the core layer also asked the camp to list the candidates for this trip as soon as possible.

After handing over the instructions, Lin Ziming directly stayed at the headquarters and discussed the selection with many responsible persons still in the camp.

"My view is to send more people to go with the caravan of the Wei mansion."

Vice captain Zeng Gucheng was the first to speak. Recently, he has been busy helping military experts to fine tune the trajectory:

"Our trade volume is not small this time, and there are a lot of spirit stones. Is it possible to send only a few... Well, although the people who come to Da Mo world are firm soldiers, I don't think it's necessary to deliberately create an environment to challenge people's desire."

"Seconded!"

Ma Ning raised his hand in agreement:

"I suggest that the Ministry of Commerce take the lead, four to five, and then we arrange several principals to follow in the camp. It's best to line up an elite team to accompany us all the way."

Hua Jun was also pulled to the meeting site because of the reason that Bing Xing might buy talismans. He only heard him ask:

"Gentlemen, I have two questions.

First, if the trade volume is large, how do you carry those materials all the way?

All kinds of parts and components of more than 2000 monsters. Conservatively, five tons are always available, right?

The second problem is

If we want to do trade, why do we have to follow the people of the Wei house instead of arranging a group of people to trade alone? "

Lin Li and Zeng Gucheng looked at each other, and then he said slowly:

"Academician Hua, the first question involves a secret of the Wei mansion. Since everyone is present today and the secret level is enough, I'll tell you directly:

The Wei mansion has a space storage bag, which can store about 500 cubic meters of materials - similar to the specification of 10x10x6, which is also the Heirloom left by Comrade Wei Siming. "

Looking at the surprised look of everyone present, Lin Li pointed to Zeng Gucheng and said:

"Lao Zeng, they have studied this space bag. Unfortunately, they have not solved any principle - note that it is any.

Therefore, we have not publicly mentioned this matter.

In addition, the nature and importance of the space bag to the Wei house, we returned it to the Wei house after a rough study.

The reason why the core layer agreed to our trade plan when the transshipment volume was almost full was to prepare for the battle and to buy a space bag of our own. "

When Lin Li finished, Zeng Gucheng sighed:

"Space technology, space technology..."

For a moment, there was a silence in the headquarters.

Space technology.

These four words do not need to be annotated. Any earth person with normal IQ can understand its meaning.

After a while, Lin Li continued:

"As for academician Hua's second question, I also discussed it with director Shi while waiting for the reply from the base camp.

He told me that such caravans of the Wei government generally have their own unique resources and contacts, and can contact many businesses we can't contact, which is the 'qualification' we lack at present. ".

In addition, Comrade Cao Yi, who has the highest cultivation level in our camp, is the one who has reached the peak of Qi training.

Think about it

What happens when a group of mortals go shopping with tens of thousands of spirit stones?

Even if we have guns that can temporarily make up for the shortcomings of cultivation, those practitioners do not know these concepts.

It's all right to go to that city, but once we reveal our wealth, do we have to call back all the way? "

Hua Jun was silent for a moment and nodded slowly:

"Then I have no problem."

Then they looked around and said:

"In that case, let's decide on a candidate.

I propose.

The trade representative of the trade group is composed of several officers of the Ministry of Commerce in Chicheng County. The accompanying team is led by Colonel Lin Ziming and accompanied by an armed team led by Comrade Gu Junming, chief of staff of the Armored Regiment.

If you have no opinion, let's start voting! "