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Sp 600 hammarlund4/30/2023 ![]() ![]() ![]() While Hammarlund was most famous for its amateur/short-wave receiver lines such as the Super Pro series and the HQ series (which includes the HQ-100, 110, 120, 129, 145, 150, 160, 170, 180, 200 and 215), a number of transmitters were also produced. The SP-600 series were widely used throughout the world for military, laboratory and commercial application In 1947 the SP-600 Super-Pro receiver, which surpassed the SP-200 in performance, was introduced, covering the frequency range of 540 kHz to 54 MHz with a 0-100 calibrated mechanical band spread. The company opened its major manufacturing facility in Mars Hill, North Carolina in 1951 specifically to offer kits for AM broadcast radios using Hammarlund parts. ![]() In the mid-1920s, Hammarlund formed a partnership called Hammarlund-Roberts Co. Their variable capacitor designs quickly became industry standards, and the component's schematic symbol was adopted as the company's logo. The first Hammarlund plant was a loft operation engaged in radio component manufacturing on Fulton Street in lower Manhattan, New York City. When the company was dissolved in 1973, it was among the USA's very oldest producers of radio equipment. ![]() The Hammarlund Manufacturing Company was founded by Oscar Hammarlund in New York City, New York, United States in 1910. Hammarlund Radio History (from Wikipedia) ![]()
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