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Version 4 27 Feb 08
Figure 9: SELECTING THE PROPER MDC BAND AND FILTER (OSCOR 4.0)
Storing a Sweep Span with the MDC
Since the MDC down-conversion process displays multiple frequency bands at once, the
easiest way to quickly view a specific frequency span is to type in a desired center
frequency and then use the EXPAND and NARROW keys to adjust the span.
To store a specific frequency span:
1. Ensure that the OSCOR is in the SWEEP mode and the MDC is connected.
2. Type in the desired center frequency between 3 and 21 GHz (or 3 and 9GHz for the
MDC-900).
3. Adjust the frequency span using the EXPAND and NARROW keys. (The number in
the top left corner of the OSCOR display shows the span.)
4. Press the STORE button.
5. To review the stored spans, simply press the RECALL button from the SWEEP mode.
Note: Further details can be found in the OSCOR Owner’s Guide.
There are some important aspects of storing spans that should be understood:
• If you store a specific frequency band in the MDC range (for example 5.6 to 5.8GHz),
the MDC will also simultaneously search a parallel frequency band (in the example it
will also search from 6.2 to 6.4GHz).
• You cannot store frequency spans that cross the 1.5GHz crossover points. See
Figures 2 and 3 for the 1.5GHz bands. Therefore, to search specifically from 4 to
6GHz as an example, you may choose to search the 3 to 9GHz antenna band with the
Group A filter to cover the range from 4.5 to 6GHz (See Figure 3). And then, store a
range centered at 4.25GHz with a 500MHz span to cover from 4 to 4.5GHz. If using
OSCOR 4.0, the fastest and simplest method would be to simply cover the entire span
from 3 to 9GHz with Filter A & B selected.
• When storing a span in memory, the actual frequency limits are not displayed in the
frequency span list. However, pressing the RECALL button will recall the span
showing the stored frequency span.
• To summarize these effects:
If you desire to cover a frequency span that is greater than 1.5GHz or crosses the
antenna bands, the best approach is always to cover the entire antenna band that
REI MDC-2100/MDC-900 10