Harman Kardon CITATION 15 Owners Manual - Page 10

In order to reproduce these stations monophonically (when in the "OUT" position of the stereo Auto/Mono Switch), rotate the STEREO THRESHOLD control clockwise until only good quality stereo stations are reproduced. EXT. DOLBY NR SWITCH When an FM station broadcasts a Dolby encoded program, it may be decoded by use of an external Dolby processor. If you use an external processor, the Dolby switch when depressed, will decode an encoded program. If the Dolby button is depressed without an external processor connected, you will get zero output from your speaker system. STEREO NOISE FILTER SWITCH Stereophonic FM broadcasts require greater signal strength at the antenna terminals (as compared to monophonic FM broadcasts). Weak or distant stereo signals will naturally contain more noise than a monophonic signal of similar strength, The Citation Fifteen STEREO NOISE FILTER will reduce or eliminate this undesirable noise. In the "OUT" position, the switch has no effect. Filtering is provided in the "IN" position. MUTE SWITCH The MUTE circuit reduces the audible noise (hissing or rushing sound) found between stations. 'l'o eliminate interstation noise, push the MUTE Switch "IN". To defeat the circuit, push the switch again. It will return to the "OUT" position. MUTING THRESHOLD CONTROL This rear panel control adjusts the level at which muting action will take place. Minimum muting action occurs in the full counterclockwise position. Maximum muting is achieved in the full clockwise position. The full clockwise position will also eliminate stations with poor transmission quality. The control should be adjusted to the point where you receive only those stations which meet your standards of broadcast quality. LEVEL SET TONE SWITCH The LEVEL SET TONE switch on the front panel activates a generator which produces a sine wave test tone of 400 Hz at a level equivalent to 50% of full modulation of an FM signal. "Off-the-air" tape recordings can be made with complete assurance of correct levels by using the test tone as a recording level reference. After activating the LEVEL SET TONE adjust the record level controls of your tape recorder so the record level meters or other indicators on your tape recorder register a level of "0" VU. At this setting recordings can be made with optimum signal-to-noise ratio and the distribution of dynamic level changes in music will be properly captured. Recorders vary in the saturation and overload characteristics of their record amplifiers which affect the occurrence of distortion in the recording process. You may find with your recorder that with the "0" VU setting of the record indicators, the reference tone is too high. While signal-to-noise ratio is usually optimum at the "0" VU setting, signal vs. distortion typically improves at lower recording levels (down to -8 VU). With some experience you will find a recording level within these values that provides a combination of high signal-tonoise ratio and low distortion that is right for you and your recorder. Because of the variation of levels required by different tape recorders, it is advisable to experiment with the record level controls on your recorder. However, once this level is determined it can remain constant. DIAL SCALE The DIAL SCALE consists of a large drum which rotates in conjunction with the knurled flywheel. The DIAL SCALE is calibrated with an FM frequency scale (88-108 mHz) and a logging scale (0-10). Most FM stations operate at frequencies which are not whole numbers (such as 96.3 mHz) as compared to 96 mHz. 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 impractical. 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 9