What's with the telegram How to use it? How was it transferred?

The principle of telegraph is that in the carrier control of transmitting equipment, the length and quantity of carrier output and the output interval are controlled by "switch" (the key of telegraph); In this way, a set of switching signals can be output in a certain "unit time". Traditionally, short messages are called "di" and long signals are called "da". In this way, several signals composed of "di-da" are called "codes", and then they are composed of specified codes, which are transmitted to the air by carriers and then translated into messages by receivers, thus completing the sending process of telegrams. For example, the s in the code corresponds to "di, di, di"; O corresponds to "click, click, click" in the code, so the code of international SOS is "click-click-click-click". From transmission to reception, the speed of telegraph is theoretically the same as that of electricity, and the main time is delayed when calling the receiver and translating the information.

Now it is rarely used for "civil use" because it is not popular.

Telegraph registration used to refer to a communication method similar to "registered letter".

I seem to remember that the previous telegram was 7 cents a word, and the urgent telegram was 0. 14 yuan. This high price is due to the underdeveloped communication in the past, and this kind of telegraph communication needs manual intervention.

Telegrams are basically eliminated now, leaving only faxes and telegrams in the market.

Morse code is very useful for telegraphy and is still used in special occasions, such as the army. Its advantage is that the speed can be controlled at will, and its anti-interference ability is the strongest. The required equipment is the simplest and can be used even if the disaster relief and communication equipment is damaged. The communication department uses mechanical and electronic teletypewriters, similar to a computer tapping a keyboard. It transmits digital pulse signals and can directly print out numbers and letters. Later, it developed into direct translation of Chinese characters.

Telegraph registration is mainly for the company. You don't have to write the name and address of the other company when sending a telegram, which can save a lot of words and trouble. As long as a four-digit number is enough, it is equivalent to only one Chinese character.

Telegrams are mainly low in labor efficiency and complicated in transmission process, and need to be sent to the other receiver in time by special personnel, so the price cannot be low.

65438+1October 16 17:28 telegrams can be divided into wired telegrams and wireless telegrams according to communication modes, and coded telegrams and cipher telegrams can be distinguished. Telegrams are mostly plain code. Through the carrier circuit, two terminals, that is, sending and receiving telegrams, combine the ten numbers from 0 to 90 into four codes of different numbers through pulse signals, and each code represents a complete Chinese character and sends it to the other party. According to the code received on the teletypewriter, the receiver manually retranslates it into Chinese characters (and then types it directly by the machine), and then sends it to the receiver by the telegraph messenger. Cryptographic telegrams are mostly used in military, earthquake, flood control, disaster relief and other field operations. They use pre-set passwords as signals, and most of them use the "click-and-answer" key to express a certain meaning.

Generally speaking, wireless telegrams can talk on the spot as long as both parties have the same frequency. Wired telegrams can only be sent after the sender fills in the telegram manuscript paper, the operator checks the translation, the circuit transmission, the telegram receiver prints, the receiver seals and the courier delivers it on the computer. If the receiver is in a city above the county level, it will take two hours at the earliest to receive the telegram from the sender. If the recipient is in the countryside, the distance from the telegraph office to the countryside is usually delivered by ordinary mail, so it is difficult to guarantee the time. Therefore, the telegraph has long been eliminated.

In the past, units with large communication volume used to register by telegraph. The applicant applied to the telegraph office, and the telegraph office compiled a set of four digits for you, representing the name of the company. In the future, all telegrams sent to this unit don't need to write the name of the unit, just write four digits to know which unit the telegram is for, which can save the telegram fee of the name of the unit. Because telegrams are charged by the word count. Early ordinary telegrams cost 0.07 yuan per word, and urgent telegrams cost 0. 14 yuan.

The telegram was sent to China by Europeans on 1897. After nearly a hundred years of use, with the popularization of telephone, the communication speed has been greatly improved. Now, except for the use of wireless communication telegraph under special circumstances, telegraph, an ancient but modern means of communication, has served mankind for more than a century. When it comes to people's vision, what is left for future generations is only to admire the greatness of their predecessors.