SECTION 3: OSCOR MANUAL OPERATION
41 REI OSC-5000E
3. Select the Sub-carrier bandwidth using the F2 button after the Sub-carrier
demodulator has been selected. (The second demodulator bandwidth can be
either 15 kHz or 6 kHz.)
4. Once the sub-carrier demodulator has been activated, the sub-carrier signal must
be tuned. Use the rotary dial to tune to the main signal on the profile screen.
5. Use the UP/DOWN buttons to tune the sub-carrier receiver between 10 kHz and
250 kHz. The signal line within the sub-carrier screen will show the actual level of
a sub-carrier and centering will be indicated by a >LOCK< condition.
NOTE: The lock function will only work when the sub-carrier tuning is within the
bandwidth of 15 kHz or 6 kHz.
NOTE: For very low frequencies (10-35 kHz), many FM radio stations may “bleed”
through to the sub-carrier demodulator. It should be obvious if the bleed is coming
from the main radio signal by toggling to the FM demodulator and comparing the
audio content to the sub-carrier demodulator.
Auto Fine Tune
The SEEK/LIMITS button, located below the SWEEP/ANALYZE button, performs an
automatic fine tune (AFT) operation. This is a particularly useful mode when manually
tuning a signal because the OSCOR will automatically lock on a signal and if the signal
drifts in frequency, the AFT function will track the signal. The AFT function is identified on
the ANALYZE screen by the LOCK indicator between the two graphs. If the AFT function
has been activated, the LOCK indicator is replaced with the following: (>>AFT<<), this
indicates that the AFT function is turned on and active. The AFT function is turned off
immediately when the rotary dial or any other controls are activated that affect frequency
control. Also, vertical dotted lines on the screen will indicate the frequency range over
which the AFT function is performed.
Pressing SHIFT and SEEK/LIMITS will invoke the automatic seek to next signal function.
The squelch knob in the audio panel is used to set the signal threshold level. The squelch
threshold is identified by a horizontal dotted line across the graphs in both the Sweep and
Analyze Modes.
Cursor Indicators
The cursor, controlled with the rotary dial, indicates the status of the signal at the
specified location. The cursor has three different shapes:
Indicates that the signal is above the squelch level, but that the demodulator
circuit has not locked onto a signal.
Indicates that the demodulator has locked onto a signal.
Indicates that the signal is below the squelch level.
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