As early as 1977, HP started manufacture of the HP856x spectrum analyzers to enhance its RF ability meters and sensors able to measuring indicators in excessive of 20 GHz. HP also developed configurable chassis dependent sweep generators effective at creating signals to 20 GHz. Other T&M products of the time https://bookmarklinx.com/story17773745/not-known-details-about-hp-%D8%AF%D8%B1-%D9%BE%D8%B2%D8%B4%DA%A9%DB%8C-%D9%85%D8%AE%D9%81%D9%81-%DA%86%DB%8C%D8%B3%D8%AA