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Chameleon Knowledge Base · The Complete Online HF Antenna Handbook

What Is a Pileup?

A pileup occurs when many stations call the same sought-after station at once, often after a CQ, spot, or rare-location appearance.

HF Operating Practices DX Operating Reviewed 2026-07-14
What it means on the air: A pileup occurs when many stations call the same sought-after station at once, often after a CQ, spot, or rare-location appearance.

Why operators use it

The running station may work simplex or split and may request a region, partial call, number, or specific order to control the callers.

Where the contact goes wrong

Calling continuously prevents listening, calling outside the requested group creates QRM, and assuming “up” without finding the actual receive window wastes transmissions.

A cleaner operating method

Listen through several contacts, determine simplex or split and the operator’s pattern, set the correct VFOs, send your full call briefly, stop immediately if another station is called, and confirm your exchange.

Operating boundary

Use current software and radio documentation, published band plans, applicable licensing rules, and the lowest power that closes the path. A decode, map position, or automated exchange does not by itself prove end-to-end communication.

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