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Commonly-Used DX Abbreviations

Abbreviation	Meaning
Na	North America
OLD	Oldies programming
Oc	Oceana
PDT	Pacific Daylight Time
PP	Portuguese
PSA	Public Service Announcement
PSRA	Pre-Sunrise Service Authorization
PSSA	Post-Sunset Service Authorization
PST	Pacific Standard Time
PX	Program/programming
QRM	Manmade interference
QRN	Naturally occurring interference

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