As for receiving radios, it is much easier, and an ore radio that does not require power to use can be done.

It is much more sensitive than the ore powder detector used by Popov and Marconi, but the manufacturing process is simpler and it is made directly from natural ore. The most preferred one is the pyrite crystals that are abundant on Xishan Island. This metal oxide is a natural semiconductor.

Of course, in the Taoist Institute, this beautiful pyrite crystal is called...the voice transmission fairy stone.

When using it, contact the ore through a metal probe. Adjust the position of the contact point on the ore to find the contact point with a semiconductor effect. Using the semiconductor effect at this point, radio waves in the air can be picked up.

In addition to ore detectors, the antennas, ground wires, coils, and capacitors required to manufacture ore radios are all technologies that the research team already possesses.

The only thing that needs to be solved is how to observe the received radio signals. The team's initial design was to use the principle of electromagnetic generation and magnetism to attract the swing of the tiny metal needle, and the receiver recorded the telegram by observing the swing of the needle.

However, in the experiment, it was found that this did not easily ensure the accuracy of the recording and could not be used on a bumpy boat. Wang Zheng made a simple electric bell to solve the problem.

When the signal is received, the electromagnetic magnet becomes magnetic and absorbs an iron piece. After it is disconnected, the iron piece bounces back with its own strength and hits a bell, which turns the electrical signal into an acoustic signal.

Now, the receiver improved by Wang Zheng can not only ring the ring, but also record different code signals on the paper tape, greatly improving the accuracy of reception.

"The 762nd experiment of Qianli Transmission begins!" Zhang Jian announced loudly in the laboratory.

When Zhao Hao solemnly pressed the electric key, he saw continuous blue sparks between the two small balls in the spark gap, making him think that he was cooking with an electronic ignition stove.

At the same time, the armature of the boost inductor vibrates like an electric bell, generating a side tone, which is the sound of the sound heard when sending and receiving the telegram. This is to allow the sender to hear the sound of his own sending.

Immediately afterwards, a crisp electric ringtone rang in the backyard, which was the receiver receiving the signal!

"It's really successful!" Soon, Zhao Shizhen, who was guarding the receiver in the backyard, rushed in with excitement on his face and shouted: "Suddenly the electric bell rang, which scared me!"

"Yes, this is just a small step, but a big step for human beings!" Zhao Hao nodded with a smile and gave several genius disciples a hug of love.

However, it is not yet time to celebrate, because this only verifies the feasibility of short-distance transmission and reception of radios, and it is not known how effective long-distance transmission and reception are.

Radios that can only be sent and received at close range are still scientific toys that do not have practicality. Only with the ability to send and receive at long distances can radios truly play a role!

So the troops were divided into two groups, and Xu Guangqi stayed in the Taoist temple to preside over the reception and reception.

Zhao Hao, Zhang Jian, Wang Zheng and his party took a transmitter and a receiver to leave the Taoist temple to test the current communication limit.

Zhao Hao then set the first field test one kilometer away from the Taoist temple.

After the guards completed the anti-snooping alert, Wang Zheng took the researchers to open the wooden boxes of two large and small, and began to carefully assemble them.

The big wooden box is Xu Guang’s inspiring the machine. Because of the Leiden bottle and canned battery, it took a little effort to assemble it. It took almost a meal to install and debug it. Then I sent a telegram to the Taoist temple. The content was Zhao Hao asked Zhao Shizhen to think of it temporarily:

‘See simple and simple’.

Two minutes later, the transmitter that had been installed suddenly rang a crisp ringtone. At the same time, the signal coming from the paper tape began to be recorded.

‘—·———’, the first thing I received was such a series of signals. In the password compiled by Zhao Hao, this is the meaning of starting transmission.

Then there is a string of signals, which translates into a string of four-digit numbers, such as ‘1223’, ‘2234’, ‘8961’.

Finally, there is the signal ‘???—?’ that represents the end of the transmission.

This kind of Zhao Hao code, which was later referred to as the "Zhao Code", basically comes from the Moss code. But Moss needs to use different electrical signals to form numbers and twenty-six letters, as well as several punctuation marks. The "Zhao Code" only needs to use an electrical signal to express ten numbers.

He ordered people to collect and organize 7,000 Chinese characters, add various numbers, punctuation and pinyin symbols, and compile them into a "Electronic Code Book".

Then, using scientific numbers to number each character, it became more than 7,000 different four-digit numbers.

This "four code method" is the simplest encoding. It does not require any skills, but simply relies on brute force. But because of this, as long as the sender changes the encoding order regularly, the opponent will not be able to crack even if the code is intercepted.

Therefore, the collector only needs to query the four digits he received and compare them with the codebook to translate the message sent from the Taoist temple:

‘Little, private, few, desire’!

It is the next sentence of "Seeing the simple and embracing simplicity".

"It's amazing my uncle!" Zhao Shizhen was shocked again.

The expressions of Zhang Jian, Wang Zheng and others were very calm.

"It seems that you are all confident." Zhao Hao smiled faintly and said, "Have you tried it many times before?"

"You must report the results to your master, so you must not ensure that you are foolproof." Zhang Jian said with a embarrassed smile.

"How far is the longest distance?" Zhao Hao didn't care about this. If he was so pretentious, wouldn't he be angry all day long?

"I didn't dare to leave the island without the orders of my master." Zhang Jian hurriedly said: "I just tried it on the island."

“Six kilometers?”

"almost."

"Then you won't waste time." Zhao Hao patted Wang Zheng's shoulder and said, "Go on the boat off the island!"

The group packed up their homes, got on the bus and left the research center, and then went to the dock of the Summer Resort to transfer to Zhao Hao's Science Number.

The "Science" that Uncle Wu gave to Zhao Hao back then has long been retired. This is a new generation of "Science" carefully built by the Jiangnan Shipyard for Zhao Hao.

The beautiful streamlined hull is painted pure white, and the most beautiful ones are everywhere you go. The interior of the hull is extremely exquisite. The wood used is the best teak, the hardware outfits are also gold-plated brass and silver products, as well as various special shock-proof and sea-corrosive glasses, which are three times more valuable than the hull.

As for the full set of state-of-the-art and top-notch living enjoyment, let alone.

However, Mr. Zhao doesn't want to make his elastic big red sandalwood bed now. He just wants to shoot radio.

The second long-distance test was conducted in the waters near Sanshan Island, 13 kilometers away from Taoguan.

This time, Zhang Jian's uncle and nephew finally became nervous, but the result was very gratifying. He didn't even need to set up a special antenna. He could receive the signal by just a piece of wire that was built on the receiver.

"That's great!" Wang Zheng cheered and jumped on the deck.

Zhao Hao sat on the sofa inquiring and said that he was very calm. He was not surprised. This was an era of no electricity. The spatial spectrum was very clean and there was almost no interference, so the ticker could easily capture wireless signals.

‘I guess it only takes a few watts of RF power to reach the world.’ he thought happily.

Next, the third test was successfully conducted in Guajingkou, 30 kilometers away.

The fourth test was 50 kilometers away and was still successful.

This is the end of the day's test.

The next day, we fought again and went to Shanghai County, which was 100 kilometers away in a straight line, and the signal began to attenuate. However, after taking a piece of antenna, the signal immediately recovered its strength. At the Jiangnan Shipyard, which was 150 kilometers away, we could still communicate successfully.

"Master, will you continue to test?" Zhang Jian asked when he saw that he was about to go out to sea again.

"Continue, what's going there?" Zhao Hao said excitedly.

Although the typhoon season has not passed, the group has established a complete early warning system. The farthest meteorological station has been built to Mindanao, and can be closely monitored from the source of the typhoon.

Under layers of early warning, the damage to the wind disasters suffered by Luzon and Taiwan every year has been greatly reduced. There is more time for the north to respond. Now the Royal Maritime Transport and Coast Guard fleet only need to enter the port to hide before the typhoon arrives. That's all the impact of the so-called typhoon season.

So the group decided to go to sea. Although the Science also had the ability to sail at sea, for safety reasons, the group still transferred to Zhao Hao's "Jiangnan".

This giant ship with a drainage of 1,300 tons was built completely according to the battleship standards. Its hull number is 00, and it was Zhao Hao's special ship when he sailed from the ocean.

In the past few years, Zhao Hao has frequently inspected various overseas administrative zones. He then casually looked for a flagship as a ship as he did in the past, and at the same time allowed the main fleet of the security area to escort, which obviously not only affects the normal operation of the security area, but also increases safety hazards.

Therefore, after the group ships are abundant, the Office of Staff suggested forming a special frigate to solve this problem.

After the proposal was approved, the frigate consisting of two other cruisers, three destroyers, three frigates, and three fly-slippers were established the year before yesterday.

The officers and soldiers of the Guard Fleet were all veterans who were politically strong and loyal and reliable from various war zones and guard zones. The fleet commander Mei Ling and police commissioner Konka were all given the title of junior police supervisor.

Although the Guards Fleet is affiliated with the General Command, it is under the leadership of the Security Department, which is Gao Wu.

Speaking of which, more than ten years have passed, Gao Wu’s title is the Director of Security. But his team has expanded to more than 30,000 people... There are even fleets.

Moreover, when the radio station is officially launched, a special communications department will be established. In China, overseas administrative regions and all war zones are deployed, and protection and confidentiality work must be done well. No ten thousand people can handle it.

A section chief under his command could make Zhao Hao's civil and military officials frightened. Hey, what's that man's name?

Alas, I can't remember it. Forget it and don't care.

Therefore, the title of the position is not important. What is important is the distance from the supreme leader and the amount of actual power.

ps. In fact, writing about how to make a transmitter is the most tiring. It is blind to check the information and it takes a lot of time. I know that many readers don’t like to read it, but I consider this to be written because it is the last and most important invention of this book. If you can’t write it later, it will make people feel that it is for the completion of the book to make the story solid. In short, it’s better to write it.
Chapter completed!