Chinese Morse Code — 摩尔斯电码: Complete Guide
How Chinese Morse Code Works — The CTC System
Chinese Morse code presents a unique challenge: Mandarin Chinese uses thousands of distinct characters (Hanzi), none of which can be encoded directly as individual Morse letters. The solution, developed in the 19th century, is the Chinese Telegraph Code (CTC) — a numerical codebook that assigns each Hanzi a unique 4-digit number between 0001 and 9999. Each digit is then transmitted as a standard ITU Morse group, making Chinese text transmissible over any Morse-capable system.
This means transmitting a single Chinese character always takes exactly four Morse digit groups. The character 你 (nǐ, "you") is assigned code 5553, transmitted as ..... ..... ... .... The character 好 (hǎo, "good/well") is code 2170, transmitted as ..--- .---- --... -----. Together, 你好 (hello / how are you) becomes a 8-group Morse sequence.
📖 The CTC Codebook
The CTC assigns 4-digit codes to 9,981 Hanzi. Numbers run from 0001 to 9999, with some values reserved. The most common 3,000 characters cover over 99% of everyday written Chinese.
🔢 Why 4 Digits?
With 4 digits (0000–9999) there are 10,000 possible codes — enough to cover all common Chinese characters, numbers, and punctuation in a single standardised system compatible with Morse telegraphy.
🏛️ ITU Standard Digits
The underlying digit Morse patterns (0–9) are identical to the ITU-R M.1677-1 international standard, so any trained Morse operator can receive CTC transmissions by looking up the codebook.
Common Chinese Phrases in Morse Code
- 你好 (Nǐ hǎo — Hello) =
..... ..... ... ... / ..--- .---- --... ----- - 我爱你 (Wǒ ài nǐ — I love you) =
..--- ----- ..... ...-- / .---- -.... ...-- --... / ..... ..... ... ... - 谢谢 (Xièxiè — Thank you) =
--... ...-- ..... ----. / --... ...-- ..... ----. - 中国 (Zhōngguó — China) =
----- ----- ..--- ..--- / ----- ----. ...-- --...
History of Chinese Morse Code and the Telegraph in China
The Chinese Telegraph Code was invented in 1871 by Septime Auguste Viguier, a French customs official stationed in Shanghai. Viguier recognised that the Morse system, designed for alphabetic scripts, had no way to handle thousands of Chinese characters. His solution was elegant: create a numbered codebook in which each character has a unique 4-digit identifier. A trained operator receiving the digits would look up the corresponding character in an identical copy of the codebook.
The Qing Dynasty government officially adopted the CTC standard in 1873 and awarded the first Chinese telegraph concession to the Great Northern Telegraph Company. China's first domestic telegraph line opened in 1881, connecting Tianjin to Shanghai — a distance of over 1,000 kilometres. Within a decade, telegraph lines reached Beijing, Guangzhou, and the major treaty ports. By the 1890s, the Chinese government had nationalised much of its telegraph infrastructure under the Imperial Telegraph Administration.
Chinese Morse Code in the Early 20th Century
During the Republican era (1912–1949), the CTC system was refined and expanded. New characters were added to the codebook as vocabulary requirements grew. The Second Sino-Japanese War (1937–1945) saw intensive use of Morse telegraphy by both Chinese military and resistance forces. Operators trained to send CTC codes at 15–20 words per minute equivalent were critical communications assets. The Communist Party of China relied heavily on Morse-equipped radio operators during its Long March and subsequent military campaigns, with coded messages often using CTC to disguise content further.
After the founding of the People's Republic of China in 1949, Morse telegraphy remained in widespread use through the telecommunications infrastructure inherited from the Republican era. The CTC codebook was standardised and revised by the new government, and Chinese telegraph operators continued to use the system for commercial and government communications into the 1980s, when digital telecommunications began to replace Morse-based systems.
Chinese Amateur Radio and the CW Community
China's main amateur radio organisations include the CRSA (Chinese Radio Sports Association) and the CRAC (China Radio Association for Citizens), both operating under the national licensing framework. Chinese amateur radio operators typically use international Latin callsigns and send messages in International Morse, following worldwide amateur radio conventions. The CTC system appears when operators specifically need to transmit Chinese text — for example, in special event stations celebrating Chinese holidays or historical occasions.
China hosts numerous amateur radio contests that include CW (Morse code) categories, including the All-Asia DX Contest and various CRSA-organised domestic competitions. Chinese ham radio operators are well-represented in international Morse code competitions, with several operators holding high-speed CW records in their regional categories.
Chinese Morse Code vs Standard International Morse
The key difference is the encoding layer. International Morse maps individual letters to dot-dash sequences directly. Chinese Morse adds an intermediate step: Hanzi → 4-digit CTC number → four ITU digit Morse groups. The underlying dot-dash patterns for digits 0–9 are completely standard and identical in both systems. A non-Chinese Morse operator receiving a CTC transmission would hear and decode four digit groups per character — they would simply need the codebook to translate those numbers back to Hanzi.
This indirect encoding makes Chinese Morse transmissions longer than equivalent alphabetic language transmissions. A short 4-character Chinese sentence requires 16 Morse digit groups, while the equivalent meaning in English might be just 4–8 letter groups. Telegraph operators charged by the character had financial incentive to use abbreviated CTC codes where possible, and a body of standard abbreviations developed in Chinese telegraphy practice.
Learning Chinese Morse Code
For Chinese speakers interested in Morse code, the recommended approach is to first learn the 10 standard ITU digit Morse patterns (0–9) fluently. Once digits feel natural, CTC encoding becomes straightforward: look up the character's 4-digit code and transmit four digit groups in sequence. The cognitive challenge is memorising CTC codes for common characters, which is aided by mnemonics and the fact that character frequency in Chinese is highly concentrated — memorising the top 500 CTC codes covers most everyday communication.
For non-Chinese speakers who want to understand Chinese Morse transmissions, the same approach applies in reverse: practise digit recognition in Morse, then use a CTC codebook (widely available online) to translate received 4-digit groups back into Hanzi.