Close in stations are removed by the main IF filter. "The preselector is a mechanism for filtering out frequencies that are closely adjacent to the frequency the operator selects, minimizing the potential interference from other signals on those nearby frequencies".Ĭompletely wrong. Those are the international designations for those particular wave bands. The Medium Wave and Long Wave bands are not "quaint". And on course FM is used in many places besides the VHF Broadcast band. For example, most shortwave stations also transmit in AM. ![]() ![]() but it was equally capable with AM (about 510 to 1620 kilohertz, which was referred to as “medium wave” in olden times), and the spectrum below that once quaintly known as long wave (148 to 420 kHz), and also FM."ĪM and FM are modulation modes, not frequency bands. Almost every paragraph has multiple technical errors of a fundamental nature.
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