User manual MCINTOSH MR87

[. . . ] McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903-2699 Phone: 607-723-3512 www. mcintoshlabs. com MR87 AM/FM Tuner Owner's Manual The lightning flash with arrowhead, within an equilateral triangle, is intended to alert the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance. WARNING - TO REDUCE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. NO USER-SERVICEABLE PARTS INSIDE. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. [. . . ] When receiving weak FM Stereo Broadcasts any background noises can be reduced by blending some of the left and right channel information together, while still maintaining "The Stereo Effect". Then rotate the PRESET/ MENU Control to select Setup Menu item "SETUP: STEREO BLEND NORMAL". Refer to figure 9. Deemphasis The FM Transmission Standard uses Preemphasis (boosting the volume level of the high frequencies) of the audio signal before transmssion. Inside the tuner Deemphasis (cutting the volume level of the high frequencies) is used to return the audio signal to the correct high frequency volume levels. The use of Preemphasis and Deemphasis helps to reduce losses and noises during the transmission/receive process. There are two different settings for Preemphasis/Deemphasis used today, one is 75µS (microseconds) and other is 50µS. For additional information contact your McIntosh Dealer or FM Broadcasters in your area for the correct setting. Then rotate the PRESET/ MENU Control to select Setup Menu item "SETUP: DEEMPHASIS _ _uS". Refer to figures 12 and 13. FM SCAN SENSITIVITY LESS MORE || Figure 6 2. Rotate the TUNE/ADJUST Control clockwise to increase the Scan Sensitivity (more stations received, however some might not be listenable), refer to figure 4. FM SCAN SENSITIVITY LESS ýýýýý MORE Figure 7 SETUP: STEREO BLEND NORMAL Figure 9 Rotate the TUNE/ADJUST Control counterclockwise to decrease the Scan Sensitivity (less 2 Distance from the radio station, radio station power output, placement and type of the FM Antenna, multipath interference and atmospheric conditions. 2. Rotate the TUNE/ADJUST Control to select "LESS NOISE" for a reduction in background noise or select "MORE SEPARATION" with a possible increase in background noise over the NORMAL Setting. Refer to figures 10 and 11. 16 SETUP: DEEMPHASIS 75uS Figure 12 SETUP: PRESETS CLEAR PRESETS: AM Figure 15 SETUP: DEEMPHASIS 50uS Figure 13 SETUP: PRESETS CLEAR PRESETS: FM Figure 16 2. Proceed to the next Setup Menu Item or press the MONO/SETUP Push-button to exit the Setup Mode. Proceed to the next Setup Menu Item or press the MONO/SETUP Push-button to exit the Setup Mode. "How to operate the Tuner" starts on page 20. SETUP: PRESETS CLEAR PRESETS: ALL Figure 17 Information Display Brightness The brightness level of the Front Panel Information Display may be changed from the default setting. Then rotate the PRESET/ MENU Control to select Setup Menu item "SETUP: DISPLAY BRIGHTNESS: 3". Refer to figure 19. Clear Presets The MR87 AM/FM Tuner has three different Tuning Modes. One of the Tuning Modes is Preset Tuning, where favorite stations are entered into memory for quick recall. There are times when it may be desirable to remove from memory all or some of the preset stations. Then rotate the PRESET/ MENU Control to select Setup Menu item "SETUP: PRESETS". Proceed to the next Setup Menu Item or press the MONO/SETUP Push-button to exit the Setup Mode. "How to operate the Tuner" starts on page 20. AM (all AM Presets are cleared) FM (all FM Presets are cleared) All (all AM and FM Presets are cleared). [. . . ] To reduce or eliminate Multipath, reorient the FM Antenna for minimum indication of Multipath even if the Signal Strength indicates less signal. 91. 5 MHz ST Mpath:¦¦¦ Noise: Figure 53 ¦ Noises received along with the desired FM Broadcast Signal can occur from a variety sources, both local and distant. If orienting the FM Antenna doesn't either reduce or eliminate the noise, an antenna with more gain and directional capability might be required. Refer to figure 54. P1 91. 5 MHz ST ¦ Pink Floyd: Money 91. 5 MHz ST ¦ Mpath: Noise:¦¦¦ Figure 54 Figure 50 22 How to Operate, con't Figure 55 illustrates a received FM Broadcast with both Multipath and Noise. 91. 5 MHz ST Mpath:¦¦¦ Noise:¦¦¦ Figure 55 ¦ 2. The Front Panel Information Display will indicate "Signal: _ _ _ _ _ _ _ _" on the second line of the Front Panel Information Display. [. . . ]