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 the recorded signal
on the decibel scale.
BATT. RESERVE
Indicates 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 and
indicates 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 indicates the motor current. Maximum deviation = 250 mA.
BIAS
This indicates the record bias level on the V/CELL scale.
NOTE :
The QRT / 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.
