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The (Yaesu FR-50 ) is one of the earlier HF receivers on the commercial market. Both the FR/FL-50 equipment were released together in 1966 by the Japanese Yaesu Musen Corp. In Europe these radios were marketed under the brand name Sommerkamp. The all-metal-cased receiver is only suitable for amateur (HAM) band reception in the AM, CW and SSB modes. As modern transceivers were not very common on the HAM bands in that days the FR-50 has not only been designed as a stand-alone receiver but it is also suitable for transceiver operation when connected to the FL-50 model Single Side Band transmitter. In 1969 the follow-on models FR/FL-50B were released with slight optic changes in the frontpanel layout and internal improvements in the mechanical filters. In 1973 the FR/FL-50B production line was closed. In Europe the sets were sold as FR-50B and FL-50B Sommerkamp. ==Technical description== The FR-50(B) is a double conversion superheterodyne type in which the 1st local oscillator is not crystal controlled but controlled by LC self-oscillation. Its oscillation frequency ranges from 8.5 MHz to 24.0 mHz depending on the used band. This type of construction makes the VFO output frequency very unstable. Two 4kHz mechanical filters are standard equipped for the internal two step IF amplifiers at 455 kHz. A 100kHz x’tal calibrator is incorporated. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Yaesu FR-50(B)」の詳細全文を読む スポンサード リンク
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