After Mao Geng finished speaking, he opened the map and gestured around Sakhalin Island, the Tatar Strait and the Northeast Continent of the Jin Kingdom.

Peng Qinfang also knew that Mao Geng was under a lot of pressure. The time and space Jin imperialism was equivalent to the existence of later American imperials. Since it was the world dominance, how could others snore on the side of the bed? Sakhalin Island is so close that it was originally the territory of the Jin Kingdom, and it was just for nothing to take it away. It would be strange that the hegemonic country of Jin imperialism would sit idly by! So war is a matter of time sooner or later.

However, even if the Jin imperialism wants to start a war, it should not be that fast. Peng Qinfang stared at the map, pointed to the Heilongjiang estuary, and said:

"I heard that Han Huanzhang and Liu Wenbin sent a fleet to Miaojie to sweep the ships. There should be few ships left by the Jin people. They should not pose a threat to Sakhalin Island in a short time. I guess even if the Jin Kingdom wants to attack Sakhalin Island, it will be next year."

Peng Qinfang believed that although the Jin people had a fast reaction force, a cavalry, and had the advantage of rapid mobilization of nomads, the attack on Sakhalin Island was not a pure land war. The Jin Kingdom had to take action. Even if there were enough ships, there would be no way to fight a large-scale Sakhalin Island attack in less than a year or two.

Upon hearing this, Mao Geng couldn't help but smile and nodded:

"The reason is this. In fact, as long as the Jin people don't come to attack us, even if we give the Jin people some benefits, it is not impossible. Cao Zhaoyi, I have asked someone to go to clichés. After arriving at Sakhalin Island, I will act at the camera and strive to let the Jin and Song Dynasty negotiate on the matter of Sakhalin Island. It's good to negotiate. They will jointly manage various plans such as the Special Administrative Region. The Jin people want benefits. Anyway, they ask for a lot of money to pay it back locally. It was not the case before the Song Dynasty.

I haven't talked about it, both countries are used to being quarrels, and it's best to quarrel for one or two years." However, Mao Geng sighed and frowned and said, "However, we still need to prepare for the Jin Dynasty to launch troops. We must have the necessary precautions! Within a year, we must have at least 5,000 troops and a strong fleet, which requires a lot of manpower, material resources and financial resources. Alas! Raising soldiers is a matter of burning money, but in this situation, it's not OK to burn them."

Finally, Mao Geng looked at Lao Peng meaningfully and said with a bitter smile:

"Old Peng, you are right. Raising soldiers to fight wars is not fun. I feel a headache when I think of this."

"Hehe, that's it, but there's nothing to worry about. Is Ma Fen still not relieved to lead the army? It's just to build more firearms. In addition, Han Huanzhang and Liu Wenbin were all powerful at sea for a while. The Jin people's navy was no match for them at all. Their warships were only robbed and burned. Of course, raising soldiers and fighting wars requires money, but even if we burn three to four million a year, we can still afford it, right! I used to oppose burning money to raise soldiers, but for Sakhalin Island, I had to change my original intention."

"Old Peng, you don't know that the food, rice, oil and salt are expensive. If you only have rifles and shotguns, it's not expensive, and grenades are not expensive. The problem is that we have to equip cannons. Mortars should be successfully tested soon. Mortars have a fast firing rate and just suppress cavalry. The problem is that they consume a lot of shells. Cannons, mortars, and shells are all expensive. Besides, they have to be equipped with a coupon, a reindeer, and Ma Fen are also preparing to build a hot ball machine armored battalion. After preliminary calculations, five thousand army will be two million guan. As for the fleet, they are even more expensive. The gunboats and lightning strike speedboats, their plan is to have eight ships, called the 88 fleet, at least two or three million guan. Look, if five million guan is smashed, you can raise such a little army."

Five million coins are not a big deal! Peng Qinfang said that we were not here to save money in the Song Dynasty, and if we make money, we should just spend it on national defense. As long as the mortar is successful, there is no need to worry. Lao Peng then felt relieved and patted Mao Geng on the shoulder:

"Tei Chief Mao, with the mortar, we are still worried about the Jin cavalry! If he dares to come, we can destroy him as much as he has."

"The mortar is a bit difficult to say. Back then, oh, no, it was later, and later the Eighth Route Army tried to produce mortar shells, and it took a long detour. Haha, of course, I also heard from Ma Fen. Ma Fen said that the quality of the iron refined by the Eighth Route Army's earth blast furnace was not very good, and it could only cast white-mouth cast iron. The processing performance of the white-mouth cast iron was very tragic. It broke when I got on the lathe. Later, I explored for a long time and solved the problem. The cast iron in the Song Dynasty was not much better, and the gray-mouth cast iron was overturned.

It can be done, but the material is still too poor, so the casting of mortar shells has not been able to pass, so I simply stopped this project. Fortunately, after Lin Lishi came, he was a professional after all, and he had more methods than me. Now that gray cast iron has passed, it is estimated that our mortar cannon tests. You see, I thought cast iron shells were not difficult, but because the cast iron technology failed, it led to the difficult delivery of mortars. Things in the world are easier said than done."

In fact, gray cast iron is not high-tech. Lin Lishi started from the material and annealing and basically completed it after more than half a year. However, the mortar also had the problem of welding tail wings. Later, he also learned from the Eighth Route Army's native methods and used the method of sintering and brazing in the furnace to solve the problem. After a while, it took more than a year to solve it. However, Lin Lishi was not satisfied with the success of gray cast iron, and he also claimed to have to produce ductile iron. If ductile iron could be made, it would be great. However, in the 12th century, ductile iron could be regarded as a real high-tech, and Mao Geng did not expect that for the time being.

Lao Peng himself is a skilled person, and sighed after hearing this:

"It is indeed not easy to climb the technology tree! I have a deep understanding of this. Take my time fiddling with radio for example. It seems that it is more simple than doing!"

"Oh, is there a breakthrough? I've been thinking about when I can use radio." Peng Qinfang is a professional student in electronics. In the time traveler's plan, the radio project was left to him, but Lao Peng was also in charge of medical treatment. Some time ago, he stayed with the old emperor as a health care doctor. Given that there has been no good news for the radio project, Mao Geng almost had no hope.

"Isn't there a Fei Ge delivering a letter?"

"The flying pigeon's letter is not safe here in Sakhalin Island. Harriers and eagles are all natural enemies of pigeons. There are a large area of ​​primeval forests in Sakhalin Island. There are too many kites and eagles. It is okay to place the flying pigeon's letters elsewhere, but they are not very useful there. If the radio passes the level and can communicate in real time, that is the most practical communication method. Especially our military strength is limited. If we do not use the information advantage, we will be passive against the Jin soldiers! The Jin soldiers can mobilize tens of thousands or hundreds of thousands of troops at any time. If we have radio, we can have information advantages. With the help of information warfare, we can flexibly operate mobile operations, and we will have greater confidence in defending Sakhalin Island. Lao Peng, how about it, is the radio power done?"

"I am in Lin'an, and I have been fiddling with radio. In addition to medical and medical matters, I do manual tests every day. Before I came, I finally made a spark transmitter and ore detector with some practical value. However, this is still far from mature. When I arrived at Sakhalin Island, you will send me a few people. Maybe in three to five months, I can use radio on Sakhalin Island."

Lao Peng's radio research in Lin'an was like a thief, because he was worried that he would be falsely accused of being a witch. Secondly, Lao Peng was originally a person who didn't like to show off. Well, he should be said to be very decent and low-key, so he always worked quietly, and even kept it from Wen Yuan. The progress of radio was also full of twists and turns. He Chian only knew that Lao Peng was working on it, and there was no big progress, so he simply didn't care anymore.

But hard work pays off. After Lao Peng's unremitting efforts, radio finally achieved some success.

When Mao Geng heard this, he was overjoyed. He immediately stepped forward and hugged Lao Peng. Then he pulled Lao Peng away without saying a word, and said:

"Why didn't you say it earlier? It's so great! Your test device, transmitter, etc. should be brought with you, go! Go and have a look!"

Peng Qinfang said that he had originally thought of talking about radio when he came to Sakhalin Island, and the sending and receiving device he made was a bit simple. It would be better to improve it when he arrived in Sakhalin Island so that he could present it. But now Mao Geng is eager to watch it, so let's watch it.

Peng Qinfang took out a box from under the bed, opened the copper lock, and moved out two small boxes from the box. The size of the box was similar to the box containing Yili milk. Mao Geng thought to himself, Lao Peng's miniaturization is good!

Old Peng held two boxes like a baby and said:

"In these two boxes, one is a spark transmitter and the other is a detector. Let's go to your place to check it out. There is a table over there, which looks more convenient."

After Lao Peng put his treasure on the table, Mao Geng finally saw the true face of the radio device made by Lao Peng.

"This thing is not complicated, and it is not very large."

"I didn't say that this thing is complicated! The spark transmitter is simple. Look, this is the boost circuit, and this is the two poles that trigger the spark. In fact, the principle is similar to the car spark plug. This is an inductor capacitance oscillation circuit, which is of course the sending button."

When Lao Peng said that, Mao Geng kept nodding.

Then Lao Peng pointed to the device next to him and introduced:

"This ore detector is simpler. The key material is the ore the size of soybeans here. This ore is galena, that is, lead sulfide. Lead sulfide is in contact with a copper spring needle. Its function is almost equal to a diode. Of course, the performance cannot be compared with the diode, but receiving the telegram also meets the requirements in a sloppy manner. As for the electric code recording roller next to it, its function is to automatically record the radio waves detected by the ore detector on the recording paper. After arriving at Sakhalin Island, install an escapement with a clockwork to automatically record it."

"It's that simple? Don't you need an electron tube!"

"No, no one is needed! Lead sulfide and copper needles are equivalent to diodes. Haha, that's that simple!"

"Old Peng, you are so awesome!"

"What awesome! I have to thank my university teacher, thanks to a story he told during his lecture. My teacher was a radio enthusiast when he was in elementary school. He was very proud of his story about his homemade ore radio. He told it very in detail, including using lead and sulfur to heat it to generate lead sulfide. In the early 1960s, radio was a luxury item. There was a homemade ore radio, which was an amazing home appliance. Haha! As for this spark transmitter, no one who learns radio didn't know. Of course, knowing it is one thing, but doing it is another thing, such as homemade capacitors, is not that simple."

...
Chapter completed!