DX Code of Conduct for the Radio Amateur - Randy Johnson, W6SJ

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  "As a reference for myself, and for all those engaged in amateur radio, here is a copy of the DX code of conduct. You are encouraged to copy it wherever you like. To make things clearer, I numbered each rule of conduct and highlighted the most important parts." - Randy Johnson W6SJ

1. I will listen, and listen, and then listen again before calling.
2. I will only call, if I can copy the DX station properly.
3. I will not trust the DX cluster and will be sure of the DX station’s call sign before calling.
4. I will not interfere with the DX station nor anyone calling and will never tune up on the DX frequency or in the QSX slot.
5. I will wait for the DX station to end a contact before I call.
6. I will always send my full call sign.
7. I will call and then listen for a reasonable interval. I will not call continuously.
8. I will not transmit when the DX operator calls another call sign, not mine.
9. I will not transmit when the DX operator queries a call sign not like mine.
10. I will not transmit when the DX station requests geographic areas other than mine.
11. When the DX operator calls me, I will not repeat my call sign unless I think he has copied it incorrectly.
12. I will be thankful if and when I do make a contact.
13. I will respect my fellow hams and conduct myself so as to earn their respect.

A "DX Code of Conduct Certificate" isn't a standard, officially recognized document. It's not a formal certification like a license or a degree. However, it refers to a set of guidelines for good DXing practices in amateur radio, promoting ethical and respectful behavior while operating on the air. 

Elaboration:
DXing, or "distance communication," is a popular activity within amateur radio, where operators strive to contact stations from distant locations. A "DX Code of Conduct" outlines principles for behaving respectfully and ethically while engaged in DXing.
Key aspects of a DX Code of Conduct (as reflected in the search results):

Respectful listening:
Operators are encouraged to listen carefully before calling, ensuring they can copy the DX station properly.

Avoiding interference:
It's important to avoid interfering with DX stations or other operators attempting to contact them.

Proper communication:
Operators should use their full call sign, wait for the DX station to end a contact before calling, and avoid continuous calling. 

Respect for other DXers:
It's crucial to conduct oneself in a manner that earns respect from other radio amateurs. 

Importance of ethical behavior:
Bad behavior on the operating bands can negatively impact the image of amateur radio.

In essence, a "DX Code of Conduct Certificate" is a non-official acknowledgement of a DX operator's commitment to following these principles of ethical and respectful operating practices. It's not a piece of paper, but rather a commitment to good conduct on the airwaves