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Nagra NAGRA 4.2 Instruction Manual

Other manuals for NAGRA 4.2: User Manual

Summary of NAGRA 4.2

  • Page 1

    Nagra 4.2 portable analogue audio tape recorder instruction manual * (ksa code no. 20 04 004 151) february 1991 edition kudelski s.A. Nagra tape recorder manufacturer ch–1033 cheseaux / switzerland phone (021) 731 21 21 telex 459 302 nagr ch telefax (021) 731 21 55 copyright reserved for all countri...

  • Page 2

    1.1 introduction the nagra 4.2 was introduced originally in 1971. It is a portable 6.35 mm (1/4") mono analogue audio tape recorder designed for high quality recording having radio, cinema, and television applications. Many mechanical and electronic modifications have been made to the machine since ...

  • Page 3: 6 1 3

    10 17 14 12 13 7 9 8 6 1 3 2 4 16 15 18 25 23 24 21 26 27 28 29 20 30 11 31 5 34 22 32 33 19.

  • Page 4

    1. Tape / direct switch (line and phones) 2. Tape / direct (snap switch) 3. Power selection switch (external/bat- teries) 4. Main function selector (six position rotary) 5. Pinchwheel lifter (stop + test only) 6. Level control mic input 2 7. Level control mic input 1 8. Reference oscillator (push bu...

  • Page 5

    1.2 controls: description and use front panel 1. Tape / direct switch (line and phones) when in "tape" position, the signal is reproduced directly from the tape. When in "direct" position, there are two possibilities: a) when recording, the signal is available before arriving on the tape. B) when pl...

  • Page 6

    5. Pinchwheel lifter (stop + test only) 6. Level control mic input 2 7. Level control mic input 1 these are the main level controls for the two microphone inputs. 8. Reference oscillator (push button) on the lower edge of the front panel, between the line and playback potentiometer and the mic 2 pot...

  • Page 7

    Pilot playback this indicates the level of the pilot signal played back from the tape. Pilot freq this indicates on the + 4 to –4% scale of the modulometer, the frequency deviation as determined by the qfm frequency meter circuit (if fitted), between the pilot signal being recorded or played back an...

  • Page 8

    Note: this only indicates the presence of a correct signal being fed to, or coming from the head, and does not guarantee correct recording of the signal. This should be checked by switching the modulometer to "pilot" playback (this does not function in the "record" mode). 16. Speed and power indicat...

  • Page 9

    Tape deck 20. Speed and equalization selector this is a six position rotary switch permitting the selection of the speed and equalization of the 4.2 in both record and playback. Possible settings are: 3 3/4 ips (9.525 cm/s) 7 1/2 ips (19.05 cm/s) 15 ips (38.10 cm/s) for each of these speed selection...

  • Page 10

    The two rollers can be replaced by either the qtim or qlen tape measuring rollers. The qtim is supplied in the place of the take–up reel tension roller as standard equipment. Qlen instead of qtim is optional. (to be stated when ordering). 26. Erase head this is a full track erase head. 27. Strobosco...

  • Page 11

    1.3 connector 36. Mike 2 input 37. Mike 1 input identical to no 36 above. Note: the microphone inputs are convertible into symmetrical and floating line inputs by installing, in place of the microphone preamplifiers, preamplifiers type qpm–6 and using the corresponding potentiometer to control the i...

  • Page 12

    40. Mixer for connection to external mixing console. (connector type; t 3478 corresponding plug t 3475/1). 1. Input with fixed sensitivity, 560 mv to obtain 0 db, input imped- ance 9 k Ω (2.5 vpp to obtain + 4 db). 2. –10 v stabilized voltage, maximum current 50 ma. Noise level 5 µv rms. 3. Direct a...

  • Page 13: 49 51

    44. Pilot and clapper inputs: 1. Ground 2. Clapper: clapper oscillator control input (control voltage + 4 to + 14 v) or switching on of qrr receiver by connecting to ground. 3. Xtal: internal crystal pilot generator output, 50/60 hz. 4. Pilot in: pilot signal input, impedance 5 k Ω . Input level 0.5...

  • Page 14

    48. Power pack 6 pole connector for external power supply and pilot signal output. 1. – batt: negative pole of battery compartment. 2. + batt: positive pole of battery compartment. 3. Pilot playback: pilot playback output. 4. Speed correction: tape speed correction input. 5. External –12 to –30: inp...

  • Page 15

    1.4 power supply all models of the nagra 4.2 may be powered either by an external power supply (atn–3) or alternatively by inter- nal batteries. The 4.2 will accept voltages ranging from –11 v to –30 v with peaks of up to –35 v. The batter- ies are placed in the bottom of the machine and the polarit...

  • Page 16

    The position volt/cell is essentially designed to monitor the voltage of some accumulators which would be dam- aged it they were allowed to discharge below a certain value. This value is 1 v /cell for certain manganese diox- ide alkaline accumulators. It is also possible to monitor the external powe...

  • Page 17

    1.5 operation on the right side of the front panel is the main function selector, which determines the mode in which the nagra works. By putting it into the position "test", all the circuits are powered, but not the motor. If the meter switch, on the upper right side of the modulometer, is switched ...

  • Page 18

    Note: it is important to lower the head–shield before loading a tape, otherwise the tape may pass behind it, and thus not be in contact with any of the heads. When the tape has been loaded and lever (32) has been restored to its original position, the shield may be lifted in front of the heads. Reco...

  • Page 19

    To wind a tape fast forward use switch (23) as for rewind. However, it is not necessary to open the pinch roller gate. The "fast forward" position of the toggle switch is only active when the main function selector is in the "playback" (with loudspeaker) position. This is done to prevent accidental ...

  • Page 20

    Discharged batteries. Direct and tape chains general signals coming from the microphone(s), line and mixer inputs, once they are amplified, fiftered, controlled and mixed, form the "direct" signal which will be recorded on the tape. The signal played back from the tape gives, after amplification and...

  • Page 21

    Limiter the nagra 4.2 is equipped with a safety limiter which instantaneously reduces the gain of the recording ampli- fier when the signal exceeds the maximum level providing that the "record" with limiter position of the main function selector has been selected. This limiting evidently causes dist...

  • Page 22

    Chapter 2: pilot 2.1 introduction the nagra 4.2 (nq–l version) is equipped with a neopilot system. This system developed by ksa, records a syn- chronization signal simultaneously with the audio, of 50 hz (60 hz in ntsc countries). Two signals are record- ed in phase opposition so as to avoid any int...

  • Page 23

    Synchronizing a recorded tape check that the machine is fitted with the qsli synchronizer circuit. This circuit is located on the right side of the battery compartment inside the machine. The circuit faces downwards, and has its front right corner cut away. Feed pilot input connector (44) with the r...

  • Page 24

    B) it can modify the tape speed of the nagra in order to render the playback pilot signal synchronous with a pilot signal coming in on the pilot socket. For this speed correction to take place, the nagra must be switched to "loudspeaker playback" and the "pilot" indicator should show a white cross. ...

  • Page 25

    This can be done as follows: method a 1. Play back the tape to be transferred without slaving. When using the qsli internal synchronizer, put the nagra into playback without loudspeaker. 2. Adjust the speed with the aid of the speed varier qsv–2 in such a manner that the playback pilot signal and th...

  • Page 26

    Pilot connectors on the nagra 4.2, the pilot playback signal is to be found on power pack connector (48) which is a 6 pin tuchel socket located on the right side of the recorder. Pin no 2 is connected to the chassis and the output pilot signal is connected to pin no 3..