92 FieldFox User’s Guide
o Narrow The IF output signal has approximately 5 MHz bandwidth.
o Wide The IF output signal has approximately 25 MHz bandwidth.
Sweep Acquisition
When set to Auto, Sweep Acquisition is set to the minimum value required with
the current settings in order to achieve amplitude accuracy when measuring CW
signals yielding the fastest sweep update rate.
However, you can adjust this setting in order to increase the probability of
intercepting and viewing pulsed RF signals.
For example, with SwpAcquisition set to Auto a pulsed GSM signal is NOT
visible on the FieldFox screen, as shown in a blue trace in the following image.
However, while watching the trace, increase the SwpAcquisition value until the
pulse spectrum rises out of the noise and reaches its maximum level. Increasing
the SwpAcquisition value beyond this point only slows the update rate (increases
the actual Sweep time readout) but does not improve measurement quality.
A GSM signal in a framed data format; timeslot zero ON; all others OFF;
PRF = 218Hz, Duty Cycle = 12.5%. The pulsed signal becomes visible on every sweep
update with SwpAcquisition = 50.
How to set Sweep Acquisition Parameter
Press Sweep 3.
Then SwpAcquistion Auto Man.
Then choose from the following:
o Auto Sweep is set to the fastest sweep possible with the current settings.
o Man Enter a relative acquisition value between 1 and 5000, where:
o 1 = Fastest sweep possible
o 5,000 = Slowest sweep possible
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