Nad 7125 Owners Manual
This is the 9 pages manual for Nad 7125 Owners Manual.
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Extracted text from Nad 7125 Owners Manual (Ocr-read)
Page 1
1. Antenna Term inals 6. Speakers 2 . Phono Inpu t 7. Speake r Impedanc e 3. Phono Ground B. AC Power Cord 4 . Aux Input 9. AC Convenience Outlet 5 . Tape Re c/Play (Not in U.K . model) 3 2 4 5 6 7 1 9 8 1 . Powe r 9. Tape Monitor 2. Phones 10. Input Selector (Aux, Phono, AM , FM ) 3. Bass 11. Tuning Pre-sels 4. Treble 12. Up/Down Tuning 5. Balance 13. Memory Enter/Mono 6. Volume 14. Tuning Display 7. Loudnes s Compensation 15. FM Stereo Beacon 8. Bass Equalization 16. Power Indicator 16 15 14 2 3 4 5 6 789 10 11 12 13 2
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REAR PANEL CONNECTIONS 1. ANTENNA TERMINALS. Thi s receiver is equipped with four antenna terminals; each is a threaded metal shaft with a plastic thumbscrew and a toothed washer which will make secure contact either with bare wire or with the U -shaped metal spade lug that is often provided on antenna wires. If you are using an antenna whose lead-in wires have some other type of connector, cut it off and strip off enough insulation to expose approximately 1 cm (V, inch) of bare wire on each conductor . To connect the antenna wire, unscrew the appropriate thumbscrew , place the spade lug or bare wire under the toothed washer, and turn the thumb screw clockwise until it is tight . The toothed washer will grip the lug or wire , making a connection that is secure both electrically and mechanically. AM. Some form of external antenna will be needed for satisfactory reception, since the rece iver does not have a built-in AM antenna. For most local broadcasting stations a simple wire up to one meter (three feet) in length will provide ample signal strength , and such a single-wire antenna is included with the receiver. Connect one end of the wire to the AM terminal. The remainder of the antenna may be allowed to hang down behind the receiver or may be tacked in place horizontally along the rear of a wooden-not metal-shelf. (A metal shelf may interfere with reception; in that case the wire should be stretched out along the wall away from the shelving and tacked in place .) You may wish to experiment with the orientation of the AM antenna, in order to find the pOSition that provides the best reception of the stations you listen to most often. The short-wire antenna usually will provide satisfactory reception of local AM broadcast stations. But if you wish to improve reception of distant AM stations, attach a long-wire outdoor antenna to the AM terminal. As its name implies, a "long-wire " antenna is a simple, straight wire whose leng th may be anything from a few feet up to about 100 feet (30 meters) , mounted parallel to the earth and as high as is convenient. In some cases the effectiveness of a long ·wire antenna will be improved by connecting a second wire from the Ground (G) terminal to a true earth-ground, i.e., a copper-plated rod driven several feet into the earth . A substitute electrical ground may also prove effective: a cold-water pipe, a steam radiator , or the third hole of a modern electrical wall socket. FM. Some form of external antenna must be connected to the receiver for effective reception of stereo FM broad casts. A ribbon-wire "folded dipole " antenna is supplied with the receiver to get you started. When you stretch out the ribbon·wire antenna you will note that it is in the form of a " T." The "crossbar " portion of the T should be stretched out horizontally and tacked in place-on a wall, on the back of a cabinet, or on the floor . The "vertical " section of the T goes to the receiver's antenna terminals . Connect its two wires to the two 3000 input terminals. In view of the excellent sensitivity of this receiver, you may find that the ribbon-wire dipole antenna is all you need for reception of strong local stations . But it is not very efficient at rejecting "multi path " and other forms of FM interference , and it cannot easily be rotated to optimize its pickup pattern for best reception of stations in different directions . Therefore , in most cases you should use a better antenna. The recommended options, in order of increasing cost , are as follows : (1 ) A basic "rabbit-ears" indoor TV antenna without auxiliary coils or tuning switches . Electrically , such an antenna is just another dipole (similar to the ribbon-wire antenna) with its tuned elements made of solid metal , but with the advantage that it can be rotated. Stretch out each of its two arms to a length of 30 inches (75 cm), and orient 3 them horizontally or at a shallow angle upward (less than 45 degrees) . The ribbon-wire emerging from the antenna's base should be connected to the receiver's two 3000 terminals in place of the ribbon -wire antenna supplied with the receiver . Now , for each station in turn , after you tune the station you can rotate the antenna for best reception . (2) A more elaborate rabbit-ears indoor TV antenna with a tuning switch. This type of antenna does NOT have greater sensitivity than the simpler rabbit-ears unit, so if your problem is that the signals you want to rece ive are weak and noisy, then an outdoor antenna is the only effec tive solution . But in cities and in large buildings where signals are strong but are contaminated by reflected "mu l tipath " signals that interfere with good reception, the tuning switch on an elaborate indoor antenna may improve recep tion by reducing the interference . (3) An electrically tuned indoor antenna , such as the Technics Wing or B.I.C. Beam Box. Again, such antennas usually do not provide any advantage over the simplest type of "rabbit-ears " unit for receiving weak signals. But where a strong signal is contaminated by interference , the antenna's aiming and tuning controls can reject the interference and yield cleaner reception . (4) An outdoor antenna. Even the finest indoor an tenna, no matter how elaborate , cannot fully exploit the capabilities of a good FM tuner. For the lowest noise, minimum distortion, and largest choice of well-received broadcasts, an outdoor antenna is the best complement to a fine tuner . A roof-mounted antenna has three fundamental advan tages. First , its large size yields better sensitivity (pulling in a stronger signal from the desired station) and a narrower directional pattern for more effective rejection of multi path refle ctions arriving from other directions . Second, its location on a roof or tall mast places it above many sources of interference -other buildings , passing cars and buses , etc . Third , the strength of received FM signals is directly propor tional to the height of the antenna above the ground . If you already have an outdoor television antenna, using a splitter to extract FM signals from it may produce excellent results . However , many TV antennas are deliberately de signed to be relatively weak at FM frequenc ies in order to minimize potential interference with TV signals at nearby frequencies (Channel 6 in the U.S .) . You may be able to use a splitter to extract FM signals from an apartment building's master TV antenna system, but usually this yields poor results because many master antenna systems have "traps " to stop FM Signals. The best choice is a direct iona l FM- only antenna , mounted as high above ground as is practical, and sepa rated by at least two meters (7 feet) from other antennas, vert ically and horizontally. A shielded lead-in cable will be mandatory in most locations, bolh to minimize interference and to preserve strong signals during years of weathering. The cable may be either 75-ohm coaxial or a shielded 300-ohm type . If desired stations are loca ted in different directions (more than 90 degrees apart), a rotor wifl also be needed in order to aim the antenna. If you are using a 75-ohm coaxial cable (either from your outdoor antenna or from a master antenna system), connect it as follows. First remove any connector that may have been fitted. Strip off about an inch (2 cm) of the outer insulation to expose the shield wiring, fold back the shield and twist its wire strands together , then strip off a half-inch (1 cm) of insulation from the center conductor. Disconnect any antenna connected to the 3000 terminals. Connect the coaxial cable's center conductor to the 750 terminal and connect the coaxial cable's shield wire to the adjacent ground (G) terminal.