MD 108 HYBRID FM TUNER INSTRUCTION MANUAL
TABLE OF CONTENTS Dear Valued Customer 3 Unpacking your MD 108 4 Control Functions 5 Front Panel Display 6 Installing the MD 108 7 Rear Panel Display 8 Tuner Remote Controls 9 Troubleshooting 11 Reception Techniques 12 FM Reception Aids and Accessories 13 Product Specifications 14 Safety Sheet 15 Limited Warranty 16 2
Dear Valued Customer, Thank you for choosing the Magnum Dynalab “MD 108” Hybrid FM Tuner, our finest FM tuner. Great care has been given in the design, manufacturing and selection of components for the “MD 108” Tuner in order to ensure many years of listening enjoyment. The MD 108 is the culmination of years of research and development. We have expended considerable effort at every phase of the design process to achieve the highest level of performance.
UNPACKING YOUR MD 108 Carefully inspect all sides of the shipping carton for damage. If there are marks or holes in the carton make note of the location in relation to the unit inside. Any obvious dents or scuff marks should alert you to the possibility of damage. Open the top flaps and carefully lift the transport case out of the carton. Carefully remove the MD 108 from the end caps and wrapping, inspect all sides.
CONTROL FUNCTIONS The front panel controls consist of the following functions (See the Front Panel Display illustration on the following page): POWER: Controls the power to all display functions. All functions are kept in stand-by mode. Any LEDs on the front that are lit will stay lit. MUTE: Controls the elimination of inter-station noise. It is recommended that, when receiving marginal signals, the mute be set to off. This will eliminate intermittent loss of signals that fall below a specific signal value.
INSTALLING THE MD 108 1. Position the tuner the shortest distance from your preamplifier. Avoid putting the unit where there are extremes in temperature. 2. Remove the AC cord from the pouch on the lid of the carrying case and plug it into the AC receptacle at the rear of the unit. DO NOT PLUG THE CORD INTO THE WALL POWER SOURCE AT THIS POINT. 3. Connect the tuner to your preamplifier using a set of cables consistent with the caliber and type (balanced or unbalanced) of your system.
TUNER REMOTE (OPTIONAL) If your tuner was ordered with the MDR “PRECISION REMOTE SYSTEM”, here are the operating instructions. 1. The power switch should be off on the front panel of the tuner 2. Using the remote handheld, push the “POWER ON” button. You will see the tuner turn on. IF YOU HAVE THE MD 108 TUNER YOU MUST TURN THE POWER ON MANUALLY ON THE FRONT PANEL TO TUNE IN MANUAL MODE. IF YOU TURN THE POWER ON WITH THE REMOTE CONTROL YOU WILL BE IN REMOTE TUNER MODE. 3.
TROUBLESHOOTING PROBLEM No sound, meter lights are not on No sound, meter lights are on Signal strength is low POSSIBLE CAUSE • Power cord disconnected • Power off at source • Fuse blown • Interconnect not properly installed • Preamp set to wrong source • Bandwidth switch not activated • Power amp off • Tube failure • Antenna not connected • Wrong type of antenna • • Reception is poor • • • • • Intermittent sound • Station too far away Antenna pointed the wrong way Antenna not connected Wrong type of
RECEPTION TECHNIQUES Antenna Cabling: The lead-in cable from the antenna is often the weakest link in the FM system. Some time spent on selection and matching will yield dramatic results when it comes to noise reduction in weak signals. A good grade of 75 ohm coaxial cable will provide very sufficient signal passage, along with effective shielding against interference. Without effective shielding your coaxial cable can in fact become an antenna in itself.
FM RECEPTION AIDS AND ACCESSORIES We have already alluded to the importance of a good quality antenna which has been designed and built with the reception of the FM bandwidth exclusively. Should you encounter a situation in which you require more gain to the FM signal or situations where you may need less gain or better selectivity then the Magnum Dynalab 205 “Signal Sleuth” may be of more benefit to you. The 205 is a FM signal processor/amplifier designed specifically for FM.
PRODUCT SPECIFICATIONS Usable sensitivity- Mono – 50 dB quieting – Mono – 50 dB quieting – Stereo – Capture ratio – Image rejection – Signal to noise ratio – Alternate channel – Wide – Alternate channel – Narrow Alternate channel – Attenuation ~ super narrow – Adjacent channel – Wide – Adjacent channel – Narrow Adjacent channel – Super Narrow – THD – Mono – THD – Stereo – Stereo separation – AM suppression – SCA rejection – IF rejection – 19 KHz and 38 KHz component rejection – Audio frequency response (+/-
SAFETY SHEET IMPORTANT SAFETY INSTRUCTIONS 1. KEEP THESE INSTRUCTIONS. 2. HEED ALL WARNINGS. 3. FOLLOW INSTRUCTIONS. 4. DO NOT USE THIS APPARATUS IN WATER. 5. CLEAN ONLY WITH DRY CLOTH. 6. DO NOT BLOCK ANY VENTILATION OPENINGS, INSTALL IN ACCORDANCE WITH THE MANUFACTURER’S INSTRUCTIONS. 7. DO NOT INSTALL NEAR ANY HEAT SOURCES SUCH AS RADIATORS, HEAT REGISTERS, STOVES, OR OTHER APPARATUS (INCLUDING AMPLIFIERS) THAT PRODUCe HEAT. 8. DO NOT DEFEAT THE SAFETY PURPOSE OF THE GROUNDING TYPE PLUG.
LIMITED WARRANTY Magnum Dynalab Ltd. herein referred to as the “manufacturer” guarantees this product to be free of defect in both material and workmanship and agrees to remedy any such defect or replace any defective component at no charge for a period of five years from date of sale to the first end user.