SECTION 3: OSCOR MANUAL OPERATION
REI OSC-5000E 42
Snuggle Bug Analysis
The Analyze Mode has a feature to quickly analyze a signal for the presence of a
snuggled transmitter. A snuggled bug is typically a narrow band RF transmitter tuned very
close to frequency of an existing wide band signal such as an FM radio station. By tuning
the snuggled signal very close to the center frequency of the wide band ambient signal,
the snuggled signal is essentially masked by the demodulation of the ambient signal.
Therefore, visual inspection of the ambient signal using a spectrum analyzer in a wide
band bandwidth mode does not easily reveal the presence of the snuggled transmitter.
This effect can be readily seen from Figure 19 in the section on Receiver Bandwidths.
Therefore, the OSCOR has a special function designed specifically for identifying the
presence of these types of snuggled transmitters. This function, which is accessed through
the Analyze mode, takes the OSCOR into its narrowest operational bandwidth and then
begins the frequency display integration function. This process insures that the
modulation effect of the signal will be integrated out of the spectrum display so that
snuggled transmitters can easily be seen in the spectrum.
To access the Snuggle Bug Analysis:
1. Ensure that the OSCOR is in the Analyze Mode and that the desired signal is
locked.
2. Press the MENU button labeled ANLZ.
3. Press the F3 button (labeled SNUGGLE)
4. Press the F1 buttons labeled “START” This will change the Analyze display to a
narrow band (6 kHz) and integrate the frequency spectrum. If a snuggle bug
exists, an additional signal will appear in the spectrum.
In this same menu, the snuggle analysis may be paused (F1), return to the original signal
bandwidth and display (F2), or you may step through a stored signal database using the
F3 and F4 buttons. This function will be described in more detail in later sections that
discuss storing a signal database.
To turn off the snuggle analysis and return to the original Analyze Mode bandwidth
parameters, press the MENU button labeled EXIT MENU.
Harmonic and LO Frequency Analysis
The Analyze Mode has a feature that provides the capability to quickly tune to harmonic
frequencies or sub-harmonic frequencies of a signal being analyzed. This is a useful
feature when analyzing a signal from a potential bugging device because most RF
bugging devices have transmitters that produce many harmonics.
The Frequency analysis function also provides the ability to inspect the LO image in the
OSCOR. The LO image is a false image that is generated internally by a local oscillator
in the OSCOR. This LO image only impacts the WhipHi and Discone antenna inputs and
the basic result is that if a very strong signal exist in one input, it is possible for this signal
to also occur in the other input at a significantly reduced level. For example, if a very
strong signal exists at 98.5MHz, it is possible for a false image to occur at 1598.5MHz in
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