Harman Kardon HK710 Owners Manual - Page 3

In designing the RF circuitry for :he hk710, our engineers set out to strike the perfect balance. They conducted exhaustive field tests both in major metropolitan locations and rural locations to ensure better sound than any tuner near the price. The hk710 had to reject unwanted signals as well as focus on the desired station. It had to contend with multipath distortion in high rise buildings. And it had to handle signals of equal strength on the same frequency originating from stations iust two hundred miles apart. The results are a tuner with impressive accuracy and quietness. The perfect balance of sensitivity and selectivity. Phase-locked loop MPX decoding. The hk710 uses phase-locked loop circuitry in its stereo multiplex section in order to ensure optimum separation and minimum distortion under all operating conditions. The phase-locked loop senses any phase error in the broadcast pilot signal and automatically makes the necessary corrections. As a result, stereo separation and THD levels are far better than in conventional tuners. MPX null circuit. Inherent in all FM stereo broad- casts is a 19 kHz subcarrier signal that can introduce audible distortion and also cause Dolby mis-tracking when FM stereo broadcasts are re- corded. The standard means of eliminating this signal is a filter, which can introduce distortion itself. In the hk710, we've used a "null circuit" instead, which keeps the signal far cleaner. Signal strength display. While most conventional analog tuners incorporate mechanical meters for signal strength displays, we don't. We use faster, more precise LEDs. Channel center display. The hk710 has its channel center indicator ingeniously incorporated into the dial lights. When properly centered, the entire AM/FM scale glows a soft green. When improperly tuned, the AM/FM scale glows a soft rose. Other hk700 series components. The hk710 is just one component in Harman Kardon's new 700 series of high technology separates. You can also add a preamplifier, amplifier and cassette deck from our line. Each conforms to the same design philosophy and rigorous standards as the hk710. Each provides the ultimate in clean, accurate performanbe. If you're building a complete component system that includes the hk710, you'll want to consider the rest of the 700 series. They were made for each other. TUNER ===-- § 100 - 0 102 11)x. 1 1200 1, 1 k , 14 • 108 EDO mfiz k z stereo auto fm am mpx filter TUNING fm mutiry Actual Size