Bright Sword: Starting from the Improved Grenade

"Come, right here, put up the telephone pole!"

Outside Huangya Cave, a communications soldier holding a pair of pliers directed several of his comrades to insert a processed wooden electric pole into the soil.

After the successful manufacture of the delta-wing glider, Zhao Tianyang began his next plan, which was to connect the arsenals of various military regions.

For this purpose, he also wrote a special "Industrial Internet Plan" and gave it to the leaders to read.

The plan mainly describes how to connect various military regions and arsenals through radio and wire.

After the connection is made, what kind of positive impact will it have, and how to use technology and strategies to prevent the enemy's electronic reconnaissance.

The leaders almost voted with their feet and agreed to this plan without hesitation.

There is nothing else to do. As long as the military regions and arsenals can be connected, it also means that the military regions are connected.

For the Eighth Route Army, this was no less important than the manufacture of the first domestically produced rifle.

For cost considerations, the commander-in-chief ordered the troops below to either prepare money or supplies and then come to the headquarters to exchange for communication equipment.

So in the past few days, Zhao Tianyang began to adjust the production plan of the arsenal.

In addition to the personnel from the engine factory, all the factories in Huangyadong had to send personnel to support the radio station factory.

At the same time, in order to save costs, Zhao Tianyang also manufactured a simpler and lower-cost spark transmitter.

Strive to ensure that even the poorest guerrillas have access to communications equipment.

And after being discovered, they can throw away these communication devices without any regret.

"Chief Zhao has installed it. The phone is now in the police station at Weng'erlangkou!"

After the signalman installed the phone, he said to Zhao Tianyang who was standing beside him.

"Row."

Zhao Tianyang nodded and looked at the special forces regiment, Captain Li, standing beside him.

"It seems that your police station will be changed into a communication room!"

"It's okay, it's all for the principle of confidentiality!"

Captain Li smiled indifferently. His company was responsible for the outer security of the Huangyadong Arsenal.

They should also be responsible for ensuring the confidentiality of communications from the outside to Huangya Cave.

"Okay, then you go ahead and get busy."

After saying that, Zhao Tianyang took the signalman into Weng'erlang and walked towards where he lived.

The wired communication between Huangyadong and the headquarters actually requires two lines, one of which is the line from the outside to the police office.

In addition to normal calls, this line is also used to attract attention.

The other one is a more concealed route that goes directly to the interior of Huangya Cave, and all key information will be transmitted through this route.

"Chief, bakelite and FM radio microphones have already been developed!"

Zhao Tianyang had just returned to the tent with the signalman when Liu Guifu came over.

“Are all the performance indicators up to standard?”

Zhao Tianyang asked.

In order to implement the "Industrial Internet Plan", in addition to the necessary radio and wired communications, radio communication technology must also be added in a timely manner.

Because Cheng Mingsheng was in charge of the construction of the hydropower station, Zhao Tianyang gave this task to Liu Guifu, and asked him to be responsible for the research and development of bakelite and FM radio telephone microphones.

Although it is a bit difficult for Liu Guifu, who has always been in charge of weapons research and development, to engage in electronic research and development.

But Liu Guifu took on the task without hesitation.

In his words, I am a brick of the revolution. I will move it wherever it is needed, no matter what it is, as long as the revolution needs it, I will learn it.

However, Zhao Tianyang didn't have time for him to study, so he directly gave him the design drawings of bakelite and FM radio microphone and asked him to do it according to the instructions.

These two things are almost not difficult as long as you know how to do them. Just two weeks later, Liu Guifu came to report to me.

“It has been tested and there is no problem!”

Liu Guifu replied.

"Okay, let's go check it out!"

Zhao Tianyang asked the signalman to stay in the tent and continue installing the telephone, while he followed Liu Guifu to the tent where he was working.

......................

After entering the tent, you can see a work table with a black wooden board and a slightly small mechanical part.

"After current testing, temperature testing, and strength testing, this piece of bakelite has completely passed the test!"

Liu Guifu picked up the black wooden board and said.

"Let me see!"

Zhao Tianyang took the board and examined it carefully.

Bakelite is made of formaldehyde (obtained from methanol by dehydrogenation), phenol (obtained by dry distillation of coal and wood)

The curing agent, hexamethylenetetramine (obtained by mixing ammonia and formaldehyde with water and purifying at high temperature) is added to the mixture and cured at high temperature.

(Methanol is obtained by dry distillation of wood)

It is acid-proof, alkali-proof, corrosion-proof and non-conductive.

"no problem!"

After Zhao Tianyang examined the wooden board, he asked, "How about the FM radio microphone? Have you tested it?"

"That's no problem, Chief, listen!"

Liu Guifu connected the FM wireless telephone receiver to the power supply, then rang "hello" twice. The simple receiver placed on the table immediately emitted a "hello" sound through the speaker.

The FM radio telephone microphone is composed of a vacuum triode, an inductor, a microphone, and a transmitting antenna.

The specific method is to use a copper wire with a diameter of 0.5 mm (the copper wire must be insulated with aluminum paint) to wind a hollow inductor with an inner diameter of five mm and three plus five turns.

Then weld the three-turn tap of the inductor to the transistor electrode, and weld the five-turn tap to the transistor base.

Weld a microphone between the middle tap of the coil and the emitter of the vacuum transistor, connect the positive pole to the inductor and the negative pole to the vacuum transistor.

Then tap the center of the inductor and solder a 470-ohm resistor. Finally, tap the center of the inductor and solder a transmitting antenna.

A FM wireless telephone microphone is now ready. If you need to speak, just connect it to the power supply and speak into the microphone.

(The microphone head is composed of a diaphragm (made of aluminum foil), a gasket, and a plate)

(The vacuum triode is made of a glass tube and metal electrodes)

Listening to the slightly distorted "hello" sound coming from the receiver speaker, Zhao Tianyang smiled with satisfaction.

"Very good, you sort out the production process and craftsmanship and hand it over to Comrade Li Yuncai."

"Let him arrange for the workers in the radio factory to produce bakelite and FM radio microphones."

"Yes!"

Liu Guifu nodded happily.

After checking the bakelite and FM radio microphone, Zhao Tianyang returned to the tent, where the signalman had just installed the phone.

"Chief Zhao's phone has been installed. The next step is to lay the telephone line. It will be connected in about three or four days."

The signalman preached to Zhao Tianyang.

"Okay, thank you for your hard work!"

Zhao Tianyang nodded.

Due to confidentiality reasons, the telephone lines inside Huangya Cave had to be buried underground, all the way to the Eighth Route Army headquarters, which was indeed quite difficult.