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The receiver you have, is a McMartin SCA receiver (Subsidiary Communications Authorization). Which is rarely used anymore today. This service was used for radio reading service for visually impaired and print handicapped users, background music services for stores, offices, and industry, and was subscription based. FM Radio based, not TV based. Has nothing to do with MTS in any form, let alone Pro.
Last edited by KentTeffeteller; 02-11-2021 at 03:21 PM.
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