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They both used an outboard AC power supply with a built-in speaker, the model 117C and its variants. Improved versions of the 350 and 500 continued to be released into the early 1970s and were Swan’s best selling models. One of the distinguishing design features of that generation of Swan transceivers was their dual rate, gear-driven tuning dial.
In electronics, motorboating is a type of low frequency parasitic oscillation (unwanted cyclic variation of the output voltage) that sometimes occurs in audio and radio equipment and often manifests itself as a sound similar to an idling motorboat engine, a "put-put-put", in audio output from speakers or earphones.
Sparkomatic was at that time primarily a producer of low to mid-range car audio products, as well as adapters to convert an 8 track player into a quadrophonic unit. By the latter half of the 1970s, they expanded into other car-related accessories such as digital dashboard clocks and CB radios.
Many were dedicated types with special functions, such as VHF receivers for police and fire channels built into a CB radio. The company's best selling products were often shortwave receivers, parts, and portable radios. In the 1960s, many Lafayette brand radios were rebranded Trio-Kenwood sets. A significant share of 1960s and 1970s vintage ...
1947 – JBL has a 15" speaker (38 cm), model D-130, using for the first time a 4" (100 mm) voice coil in a speaker cone; 1949 – James. B. Lansing dies of suicide; William Thomas became president of the company; 1954 – The 375 compression engine is the first 4-inch engine sold; its response extends to 9 kHz
Citizens band radio (CB radio) is a land mobile radio system, a system allowing short-distance one-to-many bidirectional voice communication among individuals, using two-way radios operating near 27 MHz (or the 11-m wavelength) in the high frequency or shortwave band.
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