Word: fm
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Early portables were AM only. FM became possible by making the circuits do double duty. For AM reception a built-in loopstick antenna is used; for FM, a telescoping antenna which recesses into the case of the portable...
...name of the portable game is features, but these bring up the cost. The first of these is the two-band unit, covering both AM and FM; it has a carrying strap and a rear mounted switch for selecting AM or FM, a telescoping antenna and a jack for an in-the-ear headphone. It's possible to pick up stereo FM stations but these portables are designed for mono only, and have just a single small speaker. The power source is a single 9-volt battery. Total weight, including the battery, is about 10 ounces...
Some of the larger portables are designed for stereo FM and use a pair of 4" to 6" speakers. But because the speakers are separated by a few inches, all sound, whether stereo or not, will be heard in mono only...
...chief obstacle remaining for new music in America is radio. In its early days, FM was an important outlet for artists who didn't fit into the context of Top 30 AM programming. Now FM is mostly computerized formats staffed by "air personalities" more concerned with getting their egos stroked, buying that new Porsche 914 GT and making their condominium payments than exposing the music of the young performers who will set the standards in the Eighties...
...want to help those stations that will play new stuff and that's college radio because they're not caught up in the commercial necessity of playing the hits. We hope college radio can do to radio today what FM did ten years...