3156B User Manual
WaveCAD 4-28
Racal Instrument © 2005
The Append, insert and Delete buttons operate on individual line
entries. The Clear All clears the FSK data table so you can start from
a fresh list.
The Import… and Export… buttons let you save or retrieve files. The
list is stored exactly in the same format as would be used by external
utilities. The Save button stores the table in a temporary location for
future uses by WaveCAD. The Download button updates the 3156B
with the FSK table data.
Point and click on Cancel to discard of any changes you made to the
table and to remove the FSK Data table from the screen.
Sweep
The Sweep group contains parameters for controlling the frequency
sweep function. The Start and Stop parameters program the range of
which the carrier will sweep and the Time defines how time that will
lapse for one sweep cycle. The marker setting points to a specific
frequency of which, when reached, the SYNC output generates a
marker pulse.
The “0” Frequency represents the carrier frequency and the “1”
Frequency represents the frequency to where the carrier will shift. The
data which is required for the FSK sequence is programmed and
stored in the FSK data table and the rate of which the frequency
advances through the data is programmed using the Baud Rate
parameter. Finally, the marker index points to a bit in the FSK
sequence of which, when reached, the SYNC out will generate a
marker pulse.
To change the sweep parameters point and click on one of the sweep
parameters. The value that is associated with the lit LED is displayed
on the digital display. You can use the dial, keyboard, or the [
↑
] [
↓
}
keys to adjust the readout to the required setting. After you modify the
reading, press Execute to update the 3156B with the new reading.
There are two sub-groups in the sweep block – Type and Direction.
Type
– is used to select sweep the step. The two options are: Linear
and Logarithmic.
Direction
– is used to program sweep direction. Up select sweep from
start to stop setting and Down selects sweep from the stop to start
setting.
Frequency Hop
The Hop group contains parameters for controlling the frequency hop
function. The 3156B has two hop modes: 1) Frequency hopes with
fixed hold time and 2) Frequency hops with variable hold time. The
hold, or dwell time determines the time that will lapse before the
carrier will hop to the next frequency step.
