Harman Kardon 150 Owners Manual - Page 10
Quieting, Meter, Stereo, Indicator, Antenna, Orientation, Scale, Equalization, Noise
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QUIETING METER "Quieting" is a term used in the measurement of the relative signal to noise ratio of a broadcast signal. Conventional signal strength or center channel meters do not indicate the quality of the received signal - simply their strength and pass band accuracy. Harman-Kardon's extraordinary QUIETING METER actually indicates or "reads" the signal-to-noise ratio or the QUALITY of the received signal. Maximum deflection of this meter (highest number) represents the best listening point within the pass band. As you detune closer to the edge of a station's pass band, the QUIETING METER will immediately reflect the increased noise and distortion. The QUIETING METER will "ALWAYS" agree with what you hear and will "ALWAYS" indicate the best tuning point. DIAL SCALE The dial scale on your receiver is marked with three scales, an FM frequency scale (88.108 mc), a logging scale (0-10) and an AM frequency scale. Since most FM stations operate at frequencies which are not whole numbers (such as 96 Hz as compared to 96.3 Hz). Ideally, each megacycle division on the frequency scale should be divided into 10 parts to enable the' user to pinpoint the location of the station. This would require a dial scale which would be longer han the front panel. The logging scale which is divided into 100 equal parts provides a means of finding your favorite station, once you have noted its position on the logging scale. For example, in New York City, WQXR operates at 96.4 Hz. After locating this station through the use of the frequency scale (between 96 and 98 Hz), you find that the pointer may fall on 4.2 on the logging scale. Make a note of this setting. For future tuning to WQXR simply set the pointer to 4.2 on the logging scale. STEREO INDICATOR A stereo indicator is located adjacent to the quieting meter and operates in conjunction with the STEREO FM position of the Function switch. The indicator visually shows the reproduction of FM stereo through your receiver. To tune for FM stereo proceed as follows: 1. Place the function selector switch in the STEREO FM position. 2. Tune to the station of your choice using your quieting meter for precise and accurate tuning. Your stereo indicator will now show if you are tuned to a stereo program. If the indicator is off, the program you are listening to is being broadcast monophonically. IN TUNE INDICATOR The "IN TUNE" indicator is located adjacent to the quieting meter and operates in conjunction with the "STEREO FM" and "FM" positions on the function switch. When properly tuned to the station of your choice, the "IN TUNE" indicator will light. ANTENNA ORIENTATION If your antenna system uses a rotation device, the best antenna orientation will be achieved when the QUIETING METER indicates the greatest steady deflection (highest number). Rotate the antenna in the general direction of the transmitting station's antenna and observe the QUIETING METER to make fine adjustments of the antenna's position. EQUALIZATION In order to achieve good reproduction of the wide range of frequencies in music and to make necessary adjustment for the limitations of the recording technique, record manufacturers have found it necessary to modify the actual frequency response of the music while it is being recorded. Thus, to avoid overcutting and consequent distortion, a measured and deliberate reduction is effected in low frequency response by selecting a "turnover frequency" and recording attenuated response below that point. To assure optimum signal to noise at the high frequency end when the record is played at home, the highs are deliberately exaggerated during the recording process. A measured and deliberate boost is affected above a certain frequency. This combination of deliberate exaggeration at the low and high ends of the frequency spectrum can be expressed in a recording curve. When the record is played a mirror image of that curve should be available so that the ideal "flat" response may be achieved. The PHONO 1/PHONO 2 positions of the function switch automatically introduces the proper equalization. HUM AND NOISE In any high fidelity installation, hum may be caused by the interconnection of a record player, tuner and amplifier, as a result of the cables and different grounds. If hum is experienced with your receiver, disconnect everything but the speakers from the receiver. If hum persists, reverse the AC line cord. Plug in the record player and if hum appears, reverse the record player power plug and connect a single lead from the record player chassis to the ground post on the rear of the receiver chassis. Connect your other devices in this manner. CAUTION: Hum may also be induced by defective connecting cables or by running these cables too close to a strong AC field. 9