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| ARRL (American Radio Relay League) | ||
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| ARRL License Question Pools | ||
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| ARRL Ham Radio - Getting Started | ||
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| QRZ (Callsign Database) | ||
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| Alinco Communications | ||
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| Kenwood Communications | ||
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| ICOM Communications | ||
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| Yaesu Communications | ||
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| Amateur Electronic Supply (AES) | ||
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| Ham Radio Outlet (HRO) | ||
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| CQ Magazine | ||
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| Ham Radio Online Library | ||
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| W1AW, the radio station at ARRL headquarters Newington, CT | ||
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