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available. The signal from the rectifier is then used to control the variable
gain (regulating) amplifier.
When the COMPRESSOR SPEED selector is in the "Comp. Off"
position, the variable gain amplifier itself controls the output level.
If the B.F.O. stop push button is depressed, the variable gain amplifier
receives a maximum compression signal which reduces the output of the
amplifier to zero. This suppresses the output signal until the push button is
released. The push button switch is noiseless and the output level falls by
80 dB in approximately 30 msec.
The output of the variable gain amplifier is then mixed with the signal
from the V.C.O. After filtering and amplification, the resulting signal is fed
to an attenuator (B.F.O. OUTPUT VOLTAGE) and a fixed gain output
amplifier. Finally the signal may be fed to the B.F.O. ATTENUATOR,
which selects the output range between 0.1 mV and 10 V. The output
"[§
c:
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E
ro
"'C
c:
-90dB
.Z
-BO dB
c:
-76.5
dB
0
"t
~
'6
.S:1
c:
0
E
ro
:I:
-70dB
-60dB
~
-
~
~-
~
~
.__
1---
~
-..............
~
-
1--.
+---
1 - -
t - -
+----
~
~
~
~
L
til'---
~
'\
~
r - -
II.!.-
i"""'::
~
-
~
IV
~
-..............
t - -
-- ---
- -
\
20Hz 50
100 200
500
1 kHz2
5
10
20
50
100
Frequency
171513
Fig.5.11.
Typical distortion curves for different loads and output settings
1:3.16 VRMS (600D.Sourcelmp.),No Load
II: 10 V RMS (600
D.
Source Imp.), No Load
Ill: 7 VRMS (5D. Source Imp.), 130
D.
Load
IV: 10 VRMS (5D. Source Imp.), 130
n
Load
56
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