SECTION 3: OSCOR MANUAL OPERATION
REI OSC-5000E 66
Analyzing Video Formats and Demodulation
OSCOR video capability can be demonstrated by tuning the OSCOR to local TV
stations; in the United States the video signal is 4.5 MHz (6 MHz for some formats) below
the audio signal. High-quality video transmitters typically contain an audio signal in the
same format as a TV signal. Since the OSCOR is designed to detect audio bugs in the
Automatic Mode, the OSCOR will detect a video/audio signal by locking in on the audio
portion. However, the OSCOR will not automatically classify a video transmitter as a
threat. The operator must manually check the detected signal and view the transmitted
video signals.
While the OSCOR video system is designed to specifically demodulate standard video
formats such as NTSC, PAL, and SECAM; there are common variations on these
standard video formats. Covert video transmitters often follow NTSC standards with the
exception that the video signal is FM modulated instead of AM. Or, the video
synchronization pulse may be inverted in order to confuse the normal video
demodulation process. The user can select the desired video demodulation (AM or FM)
or the desired synchronization pulse polarity using the main OSCOR video control menu.
It is very useful to press the SPECT button when analyzing a video signal and observing
the received signal while trying the AM/FM or synchronization polarity of the
demodulator.
FIGURE 44 VIDEO SIGNAL WITH NEGATIVE SYNCH PULSE
OSCOR 2.4GHz Video Search
Since there are so many 2.4GHz video transmitters commercially available, the OSCOR
has a built-in function that accesses the 2.4GHz video band with a minimum number of
keystrokes. This function automatically tunes the OSCOR to 2,450MHz. Once this
function is executed, you can quickly look for signals in this region of the frequency
spectrum by utilizing the EXPAND and NARROW buttons.
To rapidly look for signals in the 2.4GHz frequency band:
1. Press the SHIFT button.
2. Enter the numbers “0” “2” “4” on the keypad.
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