Nagra 4.2 Portable Analogue Audio Instructions Manual

 On the other hand, for a transmission, which is wholly musical, the range of the 
transmitter tends not to be used to its full advantage with a VU meter. 
 
b) The VU meter has a scale, which is not logarithmic. For the needle to move, it is 
necessary that the level exceed -20 dB. This causes the operator to compress greater 
than is necessary, that is to increase the level of the pianissimo. This reduces the 
quality of a musical transmission while increasing the range. On the other hand, it is...

 
9.0 SPECIFICATIONS 
 
DIMENSIONS AND WEIGHT 
 
Dimensions of the case with the lid closed, without knobs, feet, carrying handle, or carrying handle 
mountings: 
 
 L X W X H  
 
 12.6 x 8.8 x 4.4  
 (320 x 223 x 111 mm) 
 
Overall dimensions without handle  
 
 L X W X H  
 
 13.2 x 9.6 x 4.5  
 (335 x 243 x 114 mm) 
 
Weight, without batteries or tape 13 lb (5.89 kg) 
 
Weight with ordinary batteries, 5 reels of tape 15lb (6.8 kg)  
 
POWER  SUPPLY 
 
(Supply voltage, positive ground) –10.5 to -30 V...

TAPE TRANSPORT 
 
Switchable nominal speeds 
 
 15  ips 38.10 cm/s 
 7½ ips 19.05 cm/s 
 3¾ ips 9.525 cm/s 
 
Stability of the nominal speed with respect to the temperature (within the specified range), the 
position of the recorder, the distribution of the tape between the reels, and the supply voltage ±0.1% 
 
WOW AND FLUTTER 
 
Weighted peak-to-peak value, in accordance with  
DIN 45 507/ANSI 4372 
 
 at 15 ips 38.10 cm/s ±0,05 % 
 at 7½ is 19.05 cm/s ±0.07 % 
 at 3¾ ips 9.525 cm/s ±0.12 %...

 
FILTERS 
 
 LFA 1 (low frequency Attenuation 
 attenuation)  4 dB at 50 Hz 
 LFA 2  8 dB at 50 Hz 
 HP 1 (high-pass) 10 dB at 50 Hz 
 HP 2 20 dB at 50 Hz 
 HP 1 + LFA 1 (combination) 14 dB at 50 Hz 
 
 
REFERENCE GENERATOR 
 
1.1 kHz sine wave signal with 10 kHz component 
 
 0 VU level= -8 dB ±0.1 dB 
OUTPUTS 
 
Line output voltage on 600 Ohm for 0 dB on the modulometer 4.4 V 
 
Line output impedance   at 30 Hz 90 Ohm 
 at 50 Hz 42 Ohm 
 at   1 kHz 18 Ohm 
 at 15 kHz 24 Ohm 
 
Maximum output voltage...

MODULOMETER 
 
Integration time for - 2 dB 7.5 ms 
Usable scale -30 to +5 dB 
Frequency response 
 from 40 Hz to 20 kHz ±0,5 dB 
 
RECORDING AND PLAYBACK CHAIN 
 
Nominal recording level 0 dB= 320 nWb/m 
 
Maximum peak level (M.P.L.) + 4 dB 
 
 
Magnetic tape used for Calibration : 
 
 CCIR  LN PEM 468 
   STD PER  368 
 
 NAB  LN 3M 808 
   STD 3M 806 
 
Erasing efficiency 
 
  CCIR 84 dB 
  NAB 88 dB 
 
Frequency response, recording at 20 dB below M.P.L. 
 
15 ips (38 cm/s) CCIR and NAB   30 Hz to 20...

INPUTS 
 
NAGRA 4.2  
with QPSE-200-X0Y0 preamplifiers 
 
Microphone input 1,200 Ohm 0.2 to 43 m V 
Microphone input 2,200 Ohm 0.2 to 43 m V 
 
Unbalanced line input, impedance 100 k Ohm 
admissible voltage 0.37 to 120 V 
 
Unbalanced line input at accessory connector, 
admissible current  3.7 to 1,200 µA 
 
Mixer direct input, impedance 9 k Ohm 560 mV 
Pilot input, impedance 5 k Ohm  0.5 to 25 V