SECTION 3: OSCOR MANUAL OPERATION
REI OSC-5000E 50
NOTE: When connecting external sources that do not have their own speakers, be sure
the volume on the OSCOR loudspeaker is loud enough to be detected by any
eavesdropping device that may be in the room.
NOTE: The headphones must be unplugged to patch an external sound source through
the OSCOR speaker (see page 50 Headphones).
Audio Attenuator
The audio monitoring system has a built-in audio attenuator, which is used to prevent the
audio circuitry from being overloaded by strong audio inputs (primarily from the EXT REF
jack). The audio attenuator control has three modes of operation AUTOATTN, ATTN
ON, and ATTN OFF.
Audio Filter
The filter selects either a wide frequency audio response (20 Hz - 15 kHz) or voice band
filter (300 Hz to 3000 Hz) and will reduce many types of audio interference. The audio
filter affects the speaker and headphone outputs only. The FILTER button on the keypad
controls this filter. To toggle the audio filter mode press the FILTER button. This button
toggles the audio filter on or off, which is indicated in the center left of the top of the
display as SPEAKER FILTER ON or SPEAKER FILTER OFF.
Volume Control
The volume control increases or decreases received or monitored audio levels to the
internal speaker or headphones.
NOTE: To prevent accidental audio output while operating in the Automatic Mode, the
speaker is automatically turned off unless it is being used to provide a sound source. The
headphones are operational in the Automatic Mode.
Headphones
The headphones automatically transfer the speaker output to the headphones. The
headphones used with the OSCOR have been custom designed for low acoustic leakage
and high quality.
NOTE: Do not operate the headphone volume higher than necessary. It is possible for a
highly sensitive audio surveillance device to “hear” your headphones (a feedback is
possible).
Squelch/Signal Threshold
The squelch control will move the position of the squelch baseline on the display and the
trip point of the squelch circuit. In the Sweep and Analyze Modes, the squelch level is
indicated on the screen by a horizontal dotted line. This squelch line has several
applications:
• Sets the signal threshold when using “seek to next signal” function in the Analyze
Mode. In the Analyze Mode, only signals above the squelch threshold will be
demodulated to produce audio output.
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