On April 21, 2022, the U.S. national spectrum regulator for the private sector, the Federal Communications Commission/FCC, formally asked for input on the issue of “the role of receiver performance in (its) spectrum management responsibilities” [1]. A previous issue of this column addressed related issues and the enigmatic question “Which uses the most spectrum: transmitters or receivers?” [2]. That issue described the classic example of early U.S. market UHF TV receivers in the 1950s when UHF technology was first being introduced to consumer electronics. FCC decided at the time that the selectivity and intermodulation issues in consumer grade receivers would limit the use of UHF TV channels to channels spaced six channels apart to avoid interference [3]. Thus, only 1/6 of the apparent number of UHF channels could be used in a given city even if there were no other cities nearby. (With improved electronics and digital television modulation, television channels can now be used with a much higher density.)

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接收机对频谱管理的影响

2022 年 4 月 21 日，美国国家私营部门频谱监管机构联邦通信委员会/FCC 正式就“接收机性能在（其）频谱管理职责中的作用”问题征求意见 [1]。本专栏的上一期讨论了相关问题和神秘问题“哪个使用最多的频谱：发射器还是接收器？” [2]。该问题描述了 1950 年代早期美国市场 UHF 电视接收器的经典示例，当时 UHF 技术首次被引入消费电子产品。FCC 当时决定，消费级接收器中的选择性和互调问题将把 UHF 电视频道的使用限制在相隔六个频道的频道上，以避免干扰 [3]。因此，即使附近没有其他城市，在给定城市中也只能使用表观数量的 UHF 频道的 1/6。（随着电子和数字电视调制的改进，现在可以使用更高密度的电视频道。）