96 N9912A FieldFox User’s Guide
To set FieldFox speaker volume control, press System, then Volume. Learn
more on page 160.
Meas UNCAL Error
Meas UNCAL appears in the lower-left corner of the screen when the FieldFox
can NOT display accurate measurement results with the current settings.
Usually, the part of the trace that is inaccurate is shown at –200 dB.
The following situation can produce Meas UNCAL:
In Zerospan, when Sweep Time is set too high for the current Res BW. Lower
the Res BW or the Sweep Time setting.
When the ResBW/VBW ratio exceeds 10,000, causing the VBW filter to reach
the maximum capacity for averaging.
Old Data Indicator (*)
In SA mode, when the current trace does not exactly match the annotation that is
on the screen, an asterisk is displayed in the upper-right corner of the screen
graticule area. This would occur, for example, when the Res BW setting is
changed while in sweep Hold mode. The annotation is changed immediately, but
the trace is not updated until the next sweep occurs. Therefore, the current data
trace does not match the screen annotation. See the asterisk on page 69.
Channel Measurements
The following Channel Measurements are offered in SA Mode:
Channel Power ....................................................... 97
Occupied Bandwidth ............................................. 99
Adjacent Channel Power Ratio ......................... 100
The following four sections (Radio Standards and Channel Measurements,
Measurement Preset, Averaging, and Traces) are relevant for ALL Channel
Measurements.
Radio Standards and Channel Measurements
To tune the frequency range of any of the Channel Measurements using channels
instead of frequency, first select a Radio Standard, then select Units = CHAN.
Learn how to select a Radio Standard and channels on page 72.
When you first select a Radio Standard, then select a Channel Measurement:
With Units = FREQ selected, the center frequency and span will ALWAYS
change to the full frequency range of that standard (Uplink and Downlink) to
allow for a quick scan of energy. The X-axis annotation indicates the
frequency range.
With Units = CHAN selected, the FieldFox chooses either the uplink or
downlink band, and displays that range of frequencies. You can then tune
within that Standard using Start CHAN, Stop CHAN, or Center CHAN. The X-
axis annotation indicates the frequency range.
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