Tabor Electronics 5251, Руководство пользователя

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TE5251
User Manual
3-26
“0/1” Phase
In PSK, the carrier waveform (CW) has two phase settings: an initial
phase which is set by the “0” Phase parameter and shifted phase
which is set by the “1” Phase. The control data table has a list of “0”
and “1” values that flag when the phase shifts from base to shifted
phase.
Baud
The baud parameter sets the rate of which the generator steps
through the sequence of the PSK Control Data bits.
Marker Index
The marker setting programs a specific step (index) in the control
data string to output a pulse at the SYNC output connector. The
SYNC State button must be turned on to generate the PSK marker
output.
To access the required parameter, click on the button below
parameters sub-group until the LED next to the required parameter
turns on. 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 5251 with the new
reading.
Frequency Hop
The Frequency Hop panel contains parameters for controlling
frequency hop options. To turn the frequency hop functions on and
off, click on the
Freq Hop button in the Modulation group. The
various parameters that control frequency hop features are
described below. The output has two hop options: Fixed and
Variable. In the Fixed mode, the output steps through the pre-
assigned hop values at a constant rate, as programmed using the
dwell time parameter. In the variable mode, the output dwells on
each step for a period of time that is programmed in the Dwell
Time field in the hop data table that is programmed for the Variable
Hold option.
Hop Data
The Hop Data button in the Freq Hop group provides access to the
data string that controls the sequence of frequency hops. The hop
data table contains a list of frequencies and the output will step from
one frequency to another in the same order as programmed in the
hop data table.
Fixed Hold
The hold parameter determines how long will certain step of
frequency dwells on this specific setting before it will step to the
next frequency setting. By selecting the Fixed Hold, the hold time
remains constant throughout the entire hop table.