Some researchers are already building devices that run on "ambient" energy harvested from light, heat, vibration or TV transmitters.

一些研究者已经开始制造依靠周围光、热、振动或电视发射机提供能源的设备。

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Making matters worse, some TV and radio transmitters were illegally using that radio band.

更甚者，有些电视和无线电发射台非法使用该无线电频段。

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With F. C. C. permission, scores of local TV stations have already turned off their analog transmitters and are broadcasting solely in digital form.

在联邦通讯委员会的准入下，数十家地方电视台已经关闭了模拟信号传送器，并只用数字形式进行播放。

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Thales believes that the large number of TV transmitters means the system could provide a more reliable infrastructure than the current one which typically relies on one radar per airport.

BBC: UK mulls 'radical' shake-up of air traffic control

Its Voice of America radio broadcasts to Pakistan are hampered by obsolescent transmitters in Tajikistan and it has no TV broadcasts in Urdu or other native dialects.

CENTERFORSECURITYPOLICY: Ideologically disarmed