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COMPRESSOR SPEED: This switch changes the time constant in the regula-
tion circuit and allows regulation speeds of 30-
100-300 or 1ooo dB/sec to be obtained.
10ooo Hz REF. SIGNAL: When the main scale is set on 10ooo REF. SIGNAL
and the pushbutton marked 10ooo Hz REF. SIGNAL
is pressed the frequency of the output signal will
be exactly 10ooo Hz.
FREQUENCY SCALE
ALIGNMENT:
OUTPUT VOLTAGE:
"Fine", "Coarse". After the warming-up period these
adjustment can be used to adjust the output fre-
quency to be identical to that selected on the Main
Scale. The screwdriver-adjusted "Coarse" allows
greater variation than the "Fine" setting.
Potentiometer gives continuous adjustment of the
output signal when the automatic (COMPRESSOR)
is not in operation.
COMPRESSOR INPUT:
This terminal is provided for the external connec-
tion of equipment which will supply the necessary
signal for automatic output regulation of the BFO.
COMPRESSOR
VOLTAGE:
LOAD:
MATCHING
IMPEDANCE:
ATTENUATOR:
GROUND:
Variable potentiometer placed in the input circuit
of the regulating amplifier of the BFO.
W.
h en auto-
matic regulation is employed this can be used for
volume control of the output signal of the oscillator.
Two output terminals for matching to an external
load. The right-hand terminal is grounded.
Switch selects matching to four different load
im-
pedances of 6, 60, 600 and 6ooo ohms respectively.
A fifth position marked "Att." connects the oscil-
lator output transformer to an attenuator.
This switch allows the output to the terminal Atte-
nuator Output to be attenuated in steps of 10 dB
from 12.5 Volts to 400 ,uVolt.
Terminal is placed at side of output terminal and
gives an additional means of grounding if necessary.
13
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