Li Ke is ready to take it out before leaving, he is going to take out a total of twelve sets of large radio base stations, the kind of building signal towers, in fact, the signal tower does not need to be of high specifications, let alone as standard as modern times, just raise the antenna.

Then prepare another set of some wearing parts, which are produced at the level of modern military industry.

In terms of military industry, you can't say that it is advanced, but it is definitely based on the first principle of sturdiness and durability, so there is no doubt about its service life, at least it silently adheres to the Datang Dynasty These students have no problem tossing out the radio by themselves.

First of all, these things are set up in each of the eight directions, and the Western Regions will assume that it is in the Yili River Valley for the time being, and this will be the forefront of the Tang Dynasty for a long time.

The north side is naturally assumed to be the royal court in Xue Yantuo, the northeast part is assumed to be in Youzhou, and the east side is erected in Hudu, or Shanghai.

On the south side, due to special circumstances, the first is Guangzhou Port, and then there is Lizhi Port, and Lizhi Island and Lizhi Strait have to be built here.

In the southwest, Li Ke's idea was to build one in Lhasa in the later generations, and then build one on the Dongyang Peninsula, which was the Oman Peninsula in the later generations.

This is eight sets, and then considering that it is more difficult to transmit news in mountainous areas such as Shudi, one will be built in Kunming and other places in the future, which is ten sets.

The remaining two sets are flexible and mobile, and if Monobe Muramura cleans up Oceania, there will definitely be one built at that time.

The remaining set can be anywhere at that time, this is the approximate arrangement of twelve sets of large radio devices, in addition, Li Ke is also ready to take out ten sets of medium-sized wireless devices.

There are many ways to generate electricity from large radio installations, and the best way is naturally for Li Ke to directly provide a generator, but he doesn't have this, and the other is that the steam engine drives the generator.

This is actually not difficult, in addition to many of the previous years of the founding of the country of the local method has a good use, such as the wooden turbine power station, this small hydropower station with timber and other construction, the construction is simple, power generation does not need to be too high.

In fact, the power required for this so-called large-scale wireless device is only 6 kilowatts, and with Datang's current industrial base, the power generation efficiency of 6 kilowatts can be rectified in various ways.

It's not hard.

The simplest is a direct steam boiler, which can burn coal, wood, and other things, reaching a power generation efficiency of 6 kilowatts, and does not use much fuel.

Paired with the modern batteries that these large radios are equipped with, they can generate electricity for a day and can be used for a long time.

The ten sets of medium-sized wireless devices are arranged in some densely populated areas and important grain-producing areas, which are all within the territory of Datang, and there are large radio devices around them, and they can definitely be connected.

These medium-sized radios are even simpler in terms of generating electricity, either by stepping on a generator or by a simple generator pulled by a pack horse.

Anyway, there is a battery that can store electricity, as long as the battery is charged.

In the case of infrequent use, their batteries can be used for a long time.

And like what Li Ke found in the database, like many methods in the period of our Tu Balu, what kind of salt water soaked batteries at that time were used to improve the power problem, Li Ke can not use it now.

In fact, the best way is to divide the photovoltaic panels that Li Ke took out before directly into more than a dozen parts and place them in their respective places, so that they can continue to generate electricity, anyway, the battery stores power, so that there will be no shortage.

But that thing, Li Ke didn't want it to spread.

Let's arrange it like this.

After sorting out these things in the warehouse first, Li Ke left the warehouse and went to find Lu Daqiang, and they found a group of students who were particularly good at learning electromagnetism.

Since it is going to be taken out, it must be shown to Lao Li, and then this communication department will be placed under the management of the Ministry of Intelligence.

So after finishing it, Li Ke went directly to the Liangyi Hall to find Li Shimin.

"Dad, I'm leaving, but before I go, there's something I'm not worried about, I'm going to figure it out." Li Ke came up and said directly.

"What's the matter?" Li Shimin calmly forced it and got it out? Something new? It's good to have something new! Isn't that good? The more the better, the more the harder it is to get out, the harder it is to get rid of.

"Clairvoyance is good with the wind." Li Ke said very simply.

"What?" Li Shimin thought he had misheard.

"Clairvoyance is a long-distance communication device." Li Ke opened his mouth and said, "Or, thousands of miles of sound." ”

Li Shimin: "? ”

Are you telling me mythological stories? Your dad and I just want to trick you into being an emperor, good guy, you're going to tell me myths now, right? How? You want to tell me that you are the reincarnation of an immortal?

Looking at Lao Li's confused eyes, Li Ke said helplessly: "Dad, in short, there is an invisible signal in our air that is transmitting, and this signal I call electromagnetic waves, for example, light is a kind of electromagnetic wave. ”

Li Shimin: "? ”

He thinks he's listening to the book of heaven, listen to what you're talking about, what electromagnetic waves are just that? What are electromagnetic waves? Also, what can you identify as it alone? How to identify? Can you catch the light or not?

Why do I understand every word you say, but I can't understand it when you connect it?

"Well, we can use a device to emit an electromagnetic wave that has certain characteristics as light, and then we build a device thousands of kilometers away to receive this electromagnetic wave, and then convert it into a signal we are familiar with, and compile the specified information for the signal to achieve the purpose of transmitting the message thousands of miles away." Li Ke tried his best to explain to Li Shimin in plain language.

Li Shimin: "??? ”

"If you don't want to say it, you can not say it." Li Shimin looked at Li Ke and said, although there is only Chang Lin in this room at present, but you deliberately look like you are very uneducated and illiterate, you still have to be beaten, do you know?

"Oh, anyway, Dad, you know, I have a way to deliver news thousands of miles away." Li Ke is helpless, how can I explain it in an easy-to-understand way? It's too popular, Li Shimin thinks he's telling a story, it's too scientific, and Li Shimin hasn't learned this, where can he understand it.

"Okay, tell me, how long will it take you to deliver the news this thousand miles?" Li Shimin endured his distrust and spoke.

"For a second." Li Ke opened his mouth and said.

Li Shimin: "??? ”

Are you kidding your dad and me?