SECTION 3: OSCOR MANUAL OPERATION
29 REI OSC-5000E
Receiver Bandwidths
The OSCOR receiver is designed to receive three different Receiver bandwidths. The
Receiver Bandwidth refers to the size of (or amount of) the frequency spectrum that is
received when the OSCOR is tuned to a specific frequency. For example, normal FM
radio stations have a bandwidth of 200 kHz. This means that a radio station at 98 MHz
actually deviates from 97.9 MHz to 98.1 MHz (Note: 1,000 kHz = 1 MHz). Therefore,
when the OSCOR is tuned to a frequency of 98 MHz and the IF bandwidth is 250 kHz,
the OSCOR is actually receiving everything from 97.875 MHz to 98.125 MHz. The
OSCOR bandwidth of 250 kHz provides adequate bandwidth for the normal radio signal
with some margin to accommodate tuning inaccuracies. The various bandwidths that are
available with the OSCOR are designed for standard types of audio modulation.
Using a wide 250 kHz IF bandwidth will allow the tuning synthesizer to operate at its
maximum speed. This IF bandwidth is designed primarily for Frequency Modulated (FM)
signals and wide band Amplitude Modulated (AM) signals (see page 40 Demodulators).
The rapid refresh rate of the display will show the dynamics of the spectrum such as
modulation peaks or the on/off of two-way signals.
NOTE: Using narrow IF bandwidths on narrow deviation signals will reduce the system
noise level and produce higher sensitivity.
The following table presents the combinations of F1 Inputs (antennas)/Frequencies, F2
Bandwidth, and F3 Demodulators available.
INPUT FREQ. RANGE. DEMODULATORS / BANDWIDTHS
FM FM/SC AM SSB/CW
Infrared
10 kHz - 5 MHz** 250,15,6 250/15,6 250,15,6 6
AC VLF
10 kHz – 5 MHz 250,15,6 250/15,6 250,15,6 6
RF Loop
10 kHz – 510 kHz 250,15,6 250/15,6 250,15,6 6
Whip Low 500 kHz – 5.5 MHz
250,15,6 250/15,6 250,15,6 6
Whip High
5 MHz - 1.5 GHz 250,15,6 250/15,6 250,15,6 6
Discone
1.5 GHz - 3 GHz 250,15,6 250/15,6 250,15,6 6
Microwave
Downconverter*
3 GHz – 21 GHz 250,15,6 250/15,6 250,15,6 6
FIGURE 16 ANTENNA INPUT CONFIGURATIONS
Bold indicates default IF bandwidths and demodulators used in Automatic Mode.
These IF bandwidths are designed for the majority of signals within the specified
frequency range.
* Not available in Automatic Mode
**The infrared sensor supports wavelengths 850 -1070 nM.
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