Harman Kardon F500X Owners Manual - Page 3

INSTALLATION PROCEDURE Ventilation: The F500X tuner is well ventilated in itself, but sufficient space must be allowed around it to permit proper air flow. Install the tuner in a manner to allow for unrestricted circulation. When mounting into a cabinet allow at least 3 inches above the tubes. Do not place books or other objects on the cage or in the immediate vicinity of the instrument, Reducing the air flow will result in sharply reduced component and tube life. Caution: When custom installing the tuner do not place it directly over the amplifier. The heat generated by the amplifier may cause deterioration of tuner components. Power Requirements: Plug the AC cord into any outlet furnishing 117 volts, 50 or 60 cycle, AC current. The voltage may vary between 105 and 125 volts. An AC convenience receptacle is located on the top of the chassis and is controlled by the on/off switch. Audio Output: Two AUDIO OUTPUT receptacles are located on the rear of the tuner chassis. They are used to connect the tuner to your amplifier. For monophonic operation connect a shielded patch cord between either the Channel A or Channel B AUDIO OUTPUT receptacle and the TUNER or AUX input of your amplifier. For stereophonic operation connect two shielded patch cords between the Channel A and Channel B AUDIO OUTPUT receptacles and the stereo TUNER or AUX input receptacles of your amplifier. The special de-emphasis characteristic of the F500X includes the capacitance of the shielded connecting cable supplied with the tuner. If it is required to use a patch cord longer than three feet, please use the following chart to determine cable type. LENGTH OF CABLE 3 feet 3-10 feet 10-20 feet CABLE TYPE Shielded patch cord RG 59/U RG 71/U Connecting the FM Antenna: Due to the exceptionally high sensitivity of the F500X the 48 inch wire antenna supplied with the tuner is sufficient for all but the most difficult locations. The antenna input is designed to accept either the wire antenna or a balanced 300t/ antenna, indoor or outdoor type. When using the wire antenna supplied, the link between the ground terminal and the center terminal should be connected, and the wire antenna is to be connected to the third terminal marked "connect link to use wire antenna". When using a balanced 3000 antenna, remove the link and connect the antenna on terminals marked "remove link to use 3000 antenna". In more remote locations, an outside Yagi, folded dipole or omni-directional antenna is recommended. For the greatest gain, a 4 to 11 element Yagi designed for the FM band is suggested. A Yagi, however, is very directional and it may be desirable to use an antenna rotor if a full 360° coverage is required. For reception in the suburbs, an outside folded dipole or omni-directional dipole is recommended. Grounding: It is amplifier system. ansotthgisenmearayllryesruelctoimn ma egnrdoeudndtologorpouwnhdicthhewiFll5i0n0tXrodtoucyeohuurmcoinmtpoaynoiounr OPERATING INSTRUCTIONS The F500X incorporates the following operating controls: Automatic Frequency On/Off Switch, Mode Selector, Range Selector, Interchannel Muting Switch, Illuminated Push-Button On/Off Switch, Balance Tuning Meter, Tuning Control, and Multiplex Scratch Filter. Illuminated Push-Button On/Off Switch: This control turns the tuner on and off. It also controls the AC convenience outlet located at the rear of the tuner. Automatic Frequency Control Switch: FM broadcasting, by its very nature, eliminates almost all natural and man- made static. However, the characteristics of FM which make this possible also causes specific problems in tuning. The F500X incorporates a special electronic circuit known as AFC (automatic frequency control) that overcomes these problems and insures proper tuning even if the manual timing is not accurately done. Therefore AFC always keeps the station in the center of the channel and eliminates distortion caused by inaccurate tuning. It should be made quite clear that AFC is not a means to eliminate tuner drift. A fine wide band tuner will not drift even upon warm-up whether AFC is in the circuit or not. The following experiment will lead to an understanding of AFC and how it performs its job. Throw the AFC switch located on the front panel to "ON". Now tune across the FM band and note how the stations "pop" into place. Now tune to any station, preferably one with a musical program. Defeat the AFC circuit by throwing the AFC switch to "OFF", and tune slowly through the station from left to right. Notice there are three distinct points where the station sounds clear, interspersed with points of distorted sound. The middle, clear-sounding point is the proper tuning position for the best tone quality with minimum noise, distortion and interference. Detune the station slightly so that the sound is distorted. Now throw the AFC switch "ON" and notice how' the station retunes itself and the sound clears up. The AFC circuit has readjusted the electronic circuits to the center of the station channel. In order to take full advantage of the benefits of AFC, it is suggested that fine tuning be done with the AFC switch "OFF". When the station is aurally tuned in, throw the AFC switch "ON" and the AFC circuit will retune your careful tuning