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In an effort to combat Citizens band radio interference with television and radio signals, the FCC enacted regulations on the production and sale of linear amplifiers. The FCC justified these regulations in accordance with its mission to "prevent interference between stations". [1] The number of CB operators had grown drastically since the 1970s.
During the 1970s, the FCC banned the sale of linear amplifiers capable of operation from 24 to 35 MHz to discourage their use on the CB band, although the use of high‑power amplifiers continued. Late in 2006, the FCC amended the regulation to exclude only 26–28 MHz to facilitate amateur 10 meter operation. [ 45 ]
Along with transceivers and separates, the 4-Line included a set of matching accessories including the L-4 linear amplifier, C-4 control console, W-4 and WV-4 power meters, transmit and receive converters for the 50 MHz (6 meter) and 144 MHz (2 meter) bands, and antenna impedance matching networks , the MN-4 and MN-2000.
A linear amplifier is an electronic circuit whose output is proportional to its input, but capable of delivering more power into a load. The term usually refers to a type of radio-frequency (RF) power amplifier , some of which have output power measured in kilowatts , and are used in amateur radio .
The radio receives 3 MHz to 27 MHz AM shortwave in three bands, 26.965 MHz through 27.405 MHz HF CB in one band, 540 kHz to 1620 kHz standard AM broadcast in one band, and 87 MHz to 108 MHz monaural standard broadcast FM. The DX-60 existed in two versions, model 12-764 and a nearly identical but production-cost-reduced 12-764A.
Lafayette ran into major financial difficulty when the Federal Communications Commission (FCC) expanded a new citizens band radio ("CB") spectrum to 40 channels in 1977. Lafayette's buyers had firm commitments to accept delivery of thousands of older design units capable of only 23 channels, and were not able to liquidate the inventory without ...