Nagra NAGRA 4.2 Instruction Manual - 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 and the 50/60 Hz reference.
LEVEL
The modulometer will indicate the level of the direct or of the recorded signal on the
decibel scale.
BATT. RESERVE
Indicated on the lower scale, the bold line shows the supply voltage reserve; the lower limit
at the extreme left of the bold line represents 11 V.
VOLT/CELL
This is a battery check indicating on the V/CELL scale of the meter the Volts per cell
of the batteries.
COMPRESSION
Compression reading in decibels on the ALC compression scale when switch (10) is in the
"AUTOMATIC" position.
MOT
This measures the motor current– Maximum deviation = 250 mA.
BIAS
This indicates the record bias level on the V/CELL scale.
NOTE :
The QRT I QRR radio transmitter and receiver accessories are no longer manufactured.
13. FILTER SWITCH
This is a six position rotary switch, allowing different filter possibilities to be switched in or out.
LFA 2
Low frequency attenuation, –8 dB at 50 Hz.
LFA 1
Low frequency attenuation, –4 dB at 50 Hz.
FLAT
The machine has a linear response.
HP 1
High pass filter. –10 dB at 50 Hz.
HP1 + LFA1
Combination of high pass and low frequency attenuation, –14 dB at 50 Hz and –3
dB at 400 Hz.
HP2
High pass filter, –20 dB at 50 Hz.
14. MODULOMETER
This meter is the visual indication of many functions and levels of the machine. The modulometer displays infor-
mation according to the position of mode selector switch (12).
The modulometer has 4 scales
1. Recording level in dB
2. Frequency deviation in %
3. Battery voltage (volts / cell)
4. Compression
15. PILOT INDICATOR
If the machine is fitted with the pilot system, this rotary "SASS" type indicator shows a white segment when the
pilot signal frequency is correct.