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BODE FREQUENCY SHIFTER 1630
BODE FREQUENCY SHIFTER 1630 Controls
(1)
(3)
(2)
(6)
(7)(8) (9) (10)
The Bode 1630 Frequency Shifter shifts the frequency spectrum of a given signal by
either a fixed amount, or one that varies using control voltages. Its uses include tonal
modification, feedback suppression and frequency modulation.
SHIFT CONTROL – use this control to set the amount of fixed frequency shift,
(1)
according to the setting of the Scale control (2). Turning the control CW shifts
the frequency upwards; CCW shifts down. Note that frequencies cannot be
shifted below 0 Hz, so when using a low frequency input once 0 Hz downshift
is reached the down shift will wrap around to become an up shift.
SCALE – use this switch to set the scale for the frequency shift. The available
(2)
options are:
0 – no shifting takes place, Shift control (1) and CTRL inputs are inactive.
This mode should be used to disable frequency shifting, or for calibration.
(4)
(3)
(5)
(4)
(5)
(6)
(7)
(8)
EXP – shifting takes place on an exponential scale, from +2 Hz to +2
kHz, as marked on the Exponential scale, providing a 1 V/Octave shift
which can be controlled using the CTRL inputs (7).
5 – Gives a linear shift of + 5 Hz CW or -5 Hz CCW.
50 – Gives a linear shift of +50 Hz CW or -50 Hz CCW.
500 – Gives a linear shift of +500 Hz CW or -500 Hz CCW.
5k – Gives a linear shift of +5 kHz CW or -5 kHz CCW.
SQUELCH THRESHOLD – use this control to suppress the output of the
frequency shifter when the input level falls below the desired threshold, from
0 dBu to -60 dBu. When the squelch circuit is passing a signal then the LED
above the control will be lit. The squelch control can be disabled by removing
the jumper between pins 1 and 2 of the 12 pin test header on the underside of
the circuit board (see below).
ZERO ADJUST – use this control to calibrate the amount of shift control zero
position when an input signal is present. The speed of the flashing LED above
the control will reduce until it is close to zero (no shift). This control can also
be used as a fine adjust of the amount of shift.
MIXTURE – use this control to balance the amount of A and B signals present
on the Mix Outputs (10). CCW biases towards A, CW towards B.
SIG IN – use this 3.5 mm TS jack to input a signal to be frequency shifted.
Maximum input level is +12 dBu.
CTRL INPUTS 1-3 – use these 3.5 mm TS jacks to control the shift amount
using external CV sources. The three inputs are summed together with the
Shift control (1). Maximum voltage between the three inputs and the Shift
control is 10 V. If the amount of shift control is fully CCW the control input
range is 0 V to +10 V, If the amount of shift control is fully CW the control
input range is -10 V to 0 V.
OUT A – use these parallel 3.5 mm TS jacks to get the frequency
shifted output.
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Quick Start Guide
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