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AUTOMATIC
SCANNING:
FREQUENCY MAIN
SCALE:
FREQUENCY
INCREMENT:
SHAFT CONNECTION
for
MECHANICAL
DRIVE:
MODULATION
FREQUENCY:
OSCILLATOR STOP:
REMOTE CONTROL:
MODULATION
DEVIATION:
12
dicating meter. By this arrangement the output
frequency can be brought to coincide with the
calibration of the Frequency Main Scale.
This switch, when in the On" position, allows the
variable capacitor of the B.F.O. to be connected to
a worm drive which can be connected to, and driven
from an external motor.
Logarithmic. Indicates the output frequency when
the B.F.O. is frequency calibrated by the LINE
FREQUENCY BEAT arrangement and Frequency In-
crement Scale is set to
"0".
This makes available exact frequency selection in
the range - 500 to
+
500 Hz for the setting on the
Frequency Main Scale. FREQUENCY INCREMENT
setting is readable on the Frequency Increment
Scale.
Located on both sides of the instrument for the
connection of an external mechanical driving source
for automatic frequency sweep. The Shaft Connec-
tion fits the Flexible Shaft UB 0041 which forms
the mechanical link between the B.F.O. and the
Level Recorder Type 2305.
Switch allows the frequency of a built-in blocking
type oscillator which is used to frequency modulate
the oscillator output signal to be set to 2-4--8-
16--32 and 64 Hz.
This unit is
specially
installed for reverberation
measurements and is a noiseless switch which dis-
connects the anode voltage of the fixed oscillator.
Beneath the cap is provided six terminals for the
connection of
various
external forms of remote
control and external frequency modulation. Method
of connection is fully explained under paragraph
"
Remote Control".
By utilizing a reactance-tube circuit as a variable
inductance the fixed oscillator can be frequency
modulated with a modulation
swing
of 0 to 2ooo Hz
by the setting of this potentiometer.
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