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I don't recall ever seeing a straight 520 without the "S". I have seen 520S, 520SE, and even a rare 520D model hat was not meant for export from Japan but do not remember ever seeing a straight 520.Maybe it's a 520SP but I can't see the notch filter knob.
The American Radio Relay League (ARRL) is the national association for amateur radio, connecting hams around the U.S. with news, information and resources.
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