3152B User Manual
Publication No. 980935 Rev. A
3-30
Operation
EADS North America Test and Services
parameters control PSK modulation: shifted
phase, baud, shift data array, and marker
placement.
mod:type fhop
This selects the frequency hop modulation. The
frequency hop sequence is created in a data
table that can hold up to 5,000 frequency hops.
The following parameters control frequency hop
modulation: dwell mode, dwell time, frequency
data list, and marker placement.
mod:type ahop
This selects the amplitude hop modulation. The
amplitude hop sequence is created in a data
table that can hold up to 5,000 amplitude hops.
The following parameters control amplitude hop
modulation: dwell mode, dwell time, amplitude
data list, and marker placement.
mod:type 3d
This selects 3D modulation. This is a special
mode that modulates frequency, amplitude, and
phase simultaneously. You may set the
modulation profile externally through applications
such as ArbConnection.
Modulation
Parameters
The previous section details the modulation schemes and lists the
parameters that control the modulating signals. A complete listing of
the modulation control parameters is given in the Programming
Reference in this manual.
To program the sweep parameters, use the following commands:
swe:star <value>
Set the starting frequency for the sweep.
swe:stop <value>
Set the ending frequency for the sweep.
swe:time <value>
Set the amount of time that will elapse from
the start to the end of the sweep.
swe:dir up
Set the sweep direction to “up” (from the start
frequency to the stop frequency).
swe:dir down
Set the sweep direction to “down” (from the
stop frequency to the start frequency).
swe:spac lin
Select linear sweep steps, where the
generator steps the frequency through the
sweep range in linear increments.
swe:spac log
Select logarithmic sweep steps, where the
generator steps the frequency through the
sweep range in logarithmic increments.
swe:mark <value>
Define marker position. The marker will
generate a pulse at the SYNC output when
the marker frequency setting is crossed.
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