Harman Kardon HK330A Owners Manual - Page 11
Selecting, Monophonic, Stereo, Broadcasts, Indicator, Tuning, Meter, Scale, Function, Lights,
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SELECTING MONOPHONIC OR FM STEREO BROADCASTS Under normal use for all FM broadcasts the function selector switch should be placed in the FM STEREO position. Your receiver is equipped with a stereo sensing circuit which will automatically determine whether your unit is receiving monophonic or stereophonic broadcasts, and then automatically adjust the mode of operation. If the station is transmitting stereo, your receiver will automatically switch on the multiplex section and you will hear the broadcast in full stereo. Should the station conclude broadcasting in stereo, your receiver will automatically switch back to monophonic reception. Should you receive a weak stereo signal whose quality has been degraded by noise or poor signal conditions, and you wish to listen to this stereo broadcast monophonically, place the function selector switch in the FM position. STEREO INDICATOR A stereo indicator is located directly behind the dial glass and operates in conjunction with the FM STEREO position of the Function selector 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 FM STEREO position. 2. Tune to the station of your choice using your tuning 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. TUNING METER Your receiver incorporates a D'arsonval movement tuning meter for precise tuning of your receiver. Proper tuning is indicated by maximum deflection (highest number) of the needle. Stronger stations show greater needle movement. TUNING The tuning knob, located on the right side of the receiver is used to select the desired station when your selector switch is in the FM, FM stereo, or AM position. DIAL SCALE The dial scale on your receiver is marked with three scales, namely, an FM frequency scale (88-108 mc), a logging scale (0-100), and an AM frequency scale. Since most FM stations operate at frequencies which are not whole numbers (such as 96MC as compared to 96.3 MC). 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 than 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 96.3 MC, After locating this station through the use of the frequency scale (between 96 and 98 MC), you find that the pointer may fall on 35 on the logging scale. Make a note of this setting. For future tuning to WQXR simply set the pointer to 35 on the logging scale. FUNCTION INDICATOR LIGHTS The function indicator lights are located behind the dial glass and visually indicate the position of the function switch. 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 position of the function selector automatically introduces the proper equalization. 10