What Does 73 Mean in Ham Radio? [Explained]

Ham radio operators end their conversations with a hearty "73." This means "best regards." This unique sign-off has been very popular in the radio communication industry for over a century.

To understand the meaning and how to use it in the number at the end of a contract, you must dig down to the old days of landline telegraphy.

Today, we will discuss what does 73 mean, the origins of "73," its evaluation over time and how to use it to close a conversation respectfully.

What is "73" in Ham Radio?

"73" is commonly used shorthand for "best regards" in ham radio communication. It's a polite way to end the conversation without engaging in a lengthy discussion.

"73" is typically used at the end of a QSO (radio conversation). For example, the operator may say, "This is kilo Charlie 2 Zulu Alpha, 73 and good luck!". This is a simple and meaningful way to end a conversation that serves as a positive note.

The History of 73 in Ham Radio 

The phrase "73" dates back to the late 1800s. It's part of two-digit codes developed by Western Union for telegraph operators to communicate efficiently. In the early 20th century, amateur radio operators started to adopt the "73" code as part of their communication lexicon. Over time, it became a standard in ham radio communication. In 1927, "73" became part of the international phonetic alphabet for ham radio. It's still used to communicate clearly through voice transmissions, especially during emergencies.

The "73" code became more popular in the early days of the International Telecommunications Union (ITU) and other global standard-setting bodies. By the mid-20th century, it was adopted by civilians, ham radio operators, military, and aviation communications. This adoption helped prevent miscommunication, especially in noisy environments over long distances. As ham radio codes became more widely used globally, the ITU ensured that "73" and other similar codes were internationally recognized.

Using "73" instead of standardized communication helps operate in noisy environments or places where the communication signals are weak. This helps to operate with clear and accurate communication.

Common Mistakes And Tips in Using "73"

Here are some common mistakes that you need to avoid while using the "73" code to make sure it is used correctly:

"73" is a popular sign used in radio communication to say "goodbye" or "best regards." It should not be used in emergency situations where clear, direct communication is required. Radio operators should use plain language instead of "73" in emergencies to avoid confusion. For example, if there's a specific distress situation, it's essential to prevent "73" and use plain language for critical communication.

You can use "73" to close a conversation or a QSO (radio contact) that is respectful and friendly. Beginners should use "73" at the end of a normal conversation that is not urgent.  For example, you can use "73 from (callsign) and happy DX!" It's essential to make sure you’re not overusing "73" when communicating an important message or during an ongoing conversation that needs further discussion.

Frequently Asked Questions

Here we will learn about other important Ham Radio codes that you should know. The answers are designed in a way to help beginners understand other ham radio codes, what they mean, where they can use it and with an example. 

What does 74 mean in ham radio?

"74" sometimes means "love and kisses," although it is less common in formal ham radio communications. You can use "74" in casual and informal communication, especially when speaking to friends or close contacts. 
Example: "Good night, 74; talk to you soon."

What does 88 mean in ham radio?

"88" is a popular  ham radio code used to express"love and kisses." It is a way to express affection when signing off. You can use "88" with friends, family, or colleagues. 
Example: "Take care, 88, see you next time!"

What does 40 mean in ham radio?

"40" means the 40-meter band used for ham radio communications. It's a popular frequency range for amateur radio operators. You can use "40" when discussing the frequency or band you're operating on. 
Example: "I'll be at 40 meters this afternoon if you want to join."

What does 10-4 mean in ham radio?

"10-4" is a widely used code that means "message received" or "understood." It's part of the ten-code system that's used by law enforcement and then adopted by radio operators. You can use "10-4" to acknowledge a message or confirm receipt.
Example: "Roger that, 10-4, over."

What does 73s mean in ham radio?

"73s" is a plural version of "73," meaning "best regards" or "best wishes." It is used when sending regards to multiple people or groups. You can use "73s" when signing off to a group or sending good wishes to more than one person. 
Example: "Great chatting with you all, 73s to everyone!"

What does 51 mean in ham radio?

"51" is used in ham radio to signal "smoking" or intense heat. It is often used informally to describe hot conditions or equipment. You can use "51" to describe something that's too hot or intense. 
Example: "It's getting a bit of 51 in here with all the equipment running."

What does 59 mean in ham radio?

"59" is a standard signal report used in ham radio to indicate perfect signal quality. When you give a "59" report, it means the signal is loud and clear. You can use "59" when giving a signal report to another operator. 
Example: "Your signal is 59, loud and clear."

What does 5-9 mean in ham radio?

"5-9" is a shorthand for a signal report, indicating the operator's signal is strong and clear. It's commonly used when confirming that you hear someone perfectly. You can use "5-9" when giving a perfect signal report. 
Example: "You are 5-9, great signal!"

What does 10-20 mean in ham radio?

"10-20" is part of the ten-code system and indicates your location. You can use "10-20" when asking or telling someone where you are. 
Example: "What's your 10-20, over?"

What does 5-9-9 mean in ham radio?

"5-9-9" is a signal report that indicates that the operator's signal is flawless. This means that the signal is powerful and precise. You can use "5-9-9" to give an excellent signal report. 
Example: "You are 5-9-9, no issues at all."

What does 72 mean in ham radio?

"72" is a lesser-known code used to say "best regards" or "goodbye" in informal ham radio conversations. It's typically used when wrapping up a conversation with a friendly sign-off. You can use "72" when you want to end a discussion on a positive note.
Example: "Thanks for the chat, 72; take care!"

What does 44 mean in ham radio?

"44" is a ham radio acronym for "stay safe" or "take care." It's used to wish someone well when ending a conversation and as a positive sign-off with friends or fellow operators. 
Example: "Great talking to you, 44, and stay safe!"

Final Words

The use of "73" in ham radio continues to evolve, even today.  QRP operators- those using less than 5 watts of output power often sign off with "72, " meaning a softer and less formal goodbye. While "73" formally means "best regards," its meaning has evolved to "goodbye," "thanks," and "see you again."

"73" is a polite and respectful way to conclude a conversation. It shows respect between ham radio operators. As one might say, "When you use 73, you say goodbye with respect and clarity."