Were the wartime radios received by satellite? Please, thank you

No, military radio stations have a long history, and satellites were not yet born when they were first invented. Military radio communication equipment, a general term for technical equipment in the military that uses radio waves to transmit information. Their common working principles are:

At the transmitting end, the information becomes a baseband signal through the terminal equipment, and then the carrier wave of the transmitter is modulated to form a modulated radio frequency signal, which is amplified to a certain power and then fed to the transmitting antenna to radiate out; At the receiving end, after receiving the radio signal, the receiving antenna selects, converts, and amplifies the receiver and demodulates it into a baseband signal, and then restores it into information through the terminal equipment. Military Radio Communication Equipment - Varieties and Classifications The varieties of radio communication equipment have increased with the development of technology, and the early radio stations could only send and receive wireless telegraphy, which was called transceivers; Subsequently, wireless ** was added, known as transceivers or walkie-talkies; The equipment that uses the intermediate station ** for long-distance multi-channel communication is called a relay machine; Multiplexing devices that propagate using tropospheric or ionospheric inhomogeneous scattering are called scatterers; Communication equipment that uses communication satellite information** is called satellite communication equipment. According to the working wavelength range, it can be divided into very long wave radio, long wave radio, medium wave radio, short wave radio, ultra-short wave radio, microwave radio, etc.

According to the working mode, it can be divided into simplex radio stations that receive and send messages alternately, and duplex radio stations that receive and send at the same time. According to the mode of delivery, it can be divided into portable, vehicle-mounted (or airborne, ship-based) and fixed communication equipment. According to the modulation mode, it can be divided into amplitude modulation radio, FM radio and single sideband radio.

According to the information transmission capacity, it can be divided into single-channel and multi-channel communication equipment. Multiplexing communication equipment includes frequency-split multiplexing, time-segmented multiplexing, and code-division multiplexing communication equipment with different coding sequences. According to the equipment series, it can be divided into strategic and tactical communication equipment.

In addition, there are frequency-shift keying and phase-shift keying communication equipment in which the frequency or phase of the carrier is jumped according to the digital signal. Within the allowable range of the frequency band width, FM stations, single-sideband stations, relay machines, scatterers and satellite communication equipment can be equipped with appropriate digital terminal equipment to transmit digital signals.

No, there were no satellites before.

Long-wave, short-wave radio, the use of frequency hopping technology, high-power action distance is long, mainly used in the command center, low-power communication distance is close, equipped to the squad platoon level.

Remember.

Long-wave and short-wave radio stations use frequency-hopping leasing technology, and the high-power group type has a long distance, mainly for the command center to make the collapse and tremble, and the low-power communication distance is close, and it is equipped to the first level of the squad platoon.

The two receive in different ways, the radio station receives the radio wave signal, and the satellite receives the digital signal.

No, there were no satellites before.

Communications during the Sino-Japanese War were not made using satellites, but using radio technology.

Radio technology is the technology of propagating signals through radio waves. The principle of radio technology is that a change in the intensity of the current in a conductor produces radio waves. Using this phenomenon, information can be loaded on top of radio waves by modulation.

When the radio wave travels through space to the receiver, the change in the electromagnetic field caused by the radio wave will generate an electric current in the conductor. The purpose of information transmission is achieved by extracting the information from the current change through demodulation.

At that time, long-range radio stations used long-wave signals.

Long-wave signals can propagate along the earth's surface, generally hundreds of kilometers, and through the ionospheric reflection over the atmosphere, they can be transmitted thousands of kilometers away.

There will not be so much electromagnetic interference, the environment is good, and it is said that a 5W radio station can transmit hundreds of kilometers.

One point, and then another.