CQ represents a general call, and when followed by modifiers, it indicates that the radio station should respond to the call or specify certain attributes.
Normally, call CQ.If there are no further modifiers, everyone can answer.
Directional CQIf you do not meet the conditions, please do not answer. Typical directional CQ includes:
• When calling CQ DX, it indicates a specific callsign.DX! At least do not respond to DXCC members/local operators!
· When calling CQ EU/AS/OC/NA/SA/AF/SEA, you are specifying a callsign for Europe/Asia/Oceania/North America/South America/Africa/Southeast Asia (manual slant-eyed 6-meter CQ SEA robot)! If you are not in these locations, please do not respond!
• When using a call prefix like "CQ" (e.g., CQ BY, CQ JA), you are specifying that you want to be contacted in a particular country or region! If you are not in one of these locations, please do not respond!
* Other prefixes, including but not limited to AK=Alaska, CA=California, etc., are used to specifically call out a particular state. If you are not in one of these locations, do not respond!
Descriptive CQIt typically describes its own state, making it easier for people seeking these attributes to find and interact with it. Most radio stations can also respond to such requests.
· CQ POTA / IOTA / SOTA / JOTA, etc., indicates that the user is a radio station participating in certain activities or organizations. All stations can respond. (POTA: Air Park, IOTA: Air Islands, SOTA: Air Peaks, JOTA: Air Scouts)
· CQ 20/40/15/10: This is an old calling method. The low-pass characteristics of older radio PA systems can cause the harmonics of your signal to fall into other bands (e.g., when using CQ on 7.005 MHz CW on the 40m band, the third harmonic falls around 21.015 MHz). Other stations may receive this call on 15 meters, but they cannot communicate because the other party is actually listening on 7.005. This is where the CQ+band method comes in, which is no longer necessary, but some people still use it. Any station that confirms its operating frequency matches can respond.
· "CQ QRP" typically refers to someone who is operating under the QRP (low power) mode, but it's not commonly used. In this case, the suffix "/QRP" or the person's call sign/QRP designation is often used. It could also indicate that the person intends to contact other QRP stations.
• CQ TEST（CW）/ CQ Contest (Voice) / CQ (Contest call), indicates that you are participating in a contest. If you are participating, you should use this call sign; otherwise, it is not appropriate to use it. Some contests require cross-matching of logs, and if you do not upload the logs, the other party will be penalized.
Finally, here's a quote:DX Code of Conduct：
I will continue to listen attentively, and even more so.
Only I can properly copy and transmit DX radio calls.
Before making a call, I confirm the DX station's call sign independently of cluster information.
I will not interfere with DX stations or any other station calling them, and I will never tune my radio to the DX frequency or the band used for listening.
I will call him again after I have finished communicating with other stations on DX.
I always make sure to transmit my complete call sign.
After making the call, I will maintain a reasonable level of listening, without constantly shouting.
When a DX operator calls other stations instead of their own, I will not transmit.
When a DX operator requests confirmation of a callsign that is different from mine, I will not transmit.
When DX radio stations call from other geographical areas, I will not transmit.
When a DX operator calls me, I will not repeat my call sign unless I believe there has been an error in their reception.
I would be very grateful if we could connect successfully.
I will respect my colleagues and behave in a way that earns their respect.
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