——Zhenbei Military Science Laboratory

A machine with a long antenna is putting the finishing touches on it.

The machine was so beautiful that it could be seen filled with all kinds of wires and tubes before the lid was closed, and it was so out of place for its era.

Ma Qiang looked nervously at the machine in front of him, this is the epoch-making product he and Yan Fa and others made up together - Chuping four-type transmitter, the design power of this transmitter is 2W, using short-wave transmission, it can be said that every part is hand-ground by the best craftsmen of this era, from the cost point of view, it can almost be said that it is made of pure gold.

"How long is it until dark?"

"An hour."

Due to the use of short waves, which rely more on antenna propagation, the effect at night will be much better than during the day.

That's why in the past, spies sent reports at night.

"Then let's test it in the evening, first tell the telegraph stations around the country to prepare to receive, and we'll see how far this machine can go."

As night fell, the sun's influence on electromagnetism was minimized, and the horse was forced to start sending the news.

With the sound of dripping and dripping, invisible electromagnetic waves flew in the sky until the end of heaven and earth.

Quiescence... In the lab, no one spoke, everyone was waiting to hear back.

"Ganling received!"

"Giant deer received!"

"Yecheng received!"

"Plains received!"

....

"Red Star revenue has arrived!"

When they received the call back from the Red Star Battalion, the entire lab cheered together.

And they did! They achieved the feat of one radio station connecting three states.

As for the farthest this station can go, then none of them knows.

"Start laboratory production immediately, I'll give you a year, and after a year, I want five hundred of these transmitters!" Ma Qiang directly set the target, saying that he would produce this new type of transmitter at all costs.

With this, not to mention Chang'an, even if there are two chickens fighting in Jiaozhou, he can also know within a quarter of an hour.

"That's right! That's right again!! "Love more book city

A cry that could almost be described as desolate suddenly came from not far away, and then Ma Qiang saw the red-eyed Gan Shi running in front of him, holding a pile of manuscript paper in his hand.

"Camp master, look, the astronomical almanac, I made it up! I've been right for 10 days in a row, and the positions of the stars, moons, and days are the same as I predicted! I'm really an astrological master! ”

Gan Shi disappeared for so long, not to cultivate immortals, but to be caught by Ma Qiang, and he was writing an annoying thing - astronomical calendar.

What is an astronomical almanac, an astronomical almanac published annually and a calendar that reflects the laws of celestial motion, it can be said that without this thing, there is no way to talk about a long voyage.

Many people know what sextants and octanets are, and even in later generations, many people will write that the protagonist casually made a sextant, and then everyone was shocked and took this thing across the ocean to discover the New World.

That Ma Qiang can only say, if you play like this, you will die quickly.

Because whether it is a sextant or an ocant, as long as the principle is known, the production is indeed very simple, and in later movies, there are even protagonists who use glasses, watches and ropes to make a simplified version of the sextant, but the problem is that his correct use is not a mathematical problem, but an astronomical problem.

In fact, the principle of the sextant or octagram is very simple, that is, through the law of reflection in optics, by observing the altitude angle between the horizontal plane and the celestial body, and then by calculating the dimension, and then through the time difference between the local time and the place of departure.

And the movement of celestial bodies is constantly changing, just like the method used by Ma Qiang to determine the approximate age of the era he has arrived in the first place, even the North Star is constantly changing stars, not to mention calculating the time difference between the local time and the time of departure.

To calculate the time difference between local time and departure time, all you need is a marine clock.

Marine clocks, in fact, are extremely accurate and can counteract the waves at sea, don't think it is simple, in the beginning, clocks are timed by counting stable oscillation cycles. As long as you know how many oscillations you have experienced, you can know how much time has passed, and this method is realized by gravity pendulum, but in the waves at sea, the stability of the gravity pendulum is completely destroyed, so other ways must be used to achieve accurate calculation, this is one of the topics that Ma Qiang gave Yang Wanli - the balance spring mechanism.

The recovery force of the balance spring comes from the elastic deformation of the hairspring, which requires the elastic performance of the hairspring to work for a long time in various temperatures, humidity and salt spray environments is very stable, which is basically a material problem, and the material naturally needs Yueyang's help, Yang Wanli and Yueyang are always more convenient to talk.

Therefore, the use of a sextant actually requires the cooperation of the sextant, the astronomical calendar, and the navigation clock in order to succeed, and it is a combination of mechanics, materials science, astronomy, mathematics, and optics. You just watch and play.

Before these three artifacts are gathered, the so-called navigation is along the land line, and the sea boat is like a child who has just been able to ride a bicycle, and his mother's hand is a little farther away and will scream.

And these three things can be used not only in navigation, but also on land, as long as you find a water level.

The conditions for ocean exploration are getting more and more mature, and Ma Qiang really can't wait to see all kinds of special crops in the Americas.

As long as the corn, potatoes, and sweet potatoes can be found through the three artifacts of agriculture, Ma Qiang believes that within three to five hundred years, unless there is a man-made disaster, there will be no problem of not having enough to eat.

"Okay, Gan Daochang has made a great contribution this time, and he will definitely be able to leave a name in history! Let the world look up! ”

"Camp Master, can this thing really allow me to find the other four states in the future?" Gan Shi asked with shiny eyes.

"Of course, I told you that what is written in the Book of Mountains and Seas is actually right, this world is big, and I will let you find it later."

Ma Qiang is afraid that there are no adventurers.

In fact, the Han Dynasty already knew that this world was not only the Han Empire and the Xiongnu, Nanban and other surrounding small countries, but also the farther countries such as Guishan, Anxi, Daqin, and Body Poison, and also knew that these countries were not weaker than the Han Dynasty.

But because the Han Dynasty was so strong in this era, the Han people did not want to go out, after all, the south of their home had not been developed.

But Ma Qiang can't wait for the development of the south to go out again, it's a few centuries AD, not to mention that there are so many treasure chests in the Americas waiting to be opened by himself, he must coax and deceive the Han people to go out of East Asia and go to the world.