Tabor Electronics 5251, Руководство пользователя

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TE5251
User Manual
4-64
Below you can see how an PSK data table and a 16PSK data table are constructed. The PSK data table
sample below shows a list of 10 shifts. The 5251 will step through this list, outputting either start or shifted
phases, depending on the data list: Zero will generate start phase and One will generate shifted phase.
Note that the output waveform is always sinewave and that the last cycle is always completed. The 16PSK
data array has 10 shifts as well except this time the shifts are a bit more complex.
Sample PSK Data Array
0 1 1 1 0 1 0 0 0 1
Sample 16PSK Data Array
0000 0100 1010 0111 1111 0001 0010 0111 0101 1111
Parameters
Name Type Description
<psk_data> ASCII Block of ASCII data that contains information for the
generator when to step from one phase setting to
another.
PSK:MARKer<index>(?)
Description
Programs where on the data stream the 5251 will generate a pulse, designated as PSK marker, or index
point. The marker pulse is generated at the SYNC output connector. Note that if you intend to program
marker position, you must do it before you load the PSK data list. The PSK:MARK command is common to
all PSK modulation functions.
Parameters
Name Range Type Default Description
<index> 1 to
4000 Numeric
(integer only) 1
Programs a marker pulse at an index bit position.
Response
The 5251 will return the present marker position.
PSK:BAUD<baud>(?)
Description
This allows the user to select (n)PSK baud. The baud is the interval of which the symbols stream in the
(n)PSK data array as they are clocked with the baud generator. Note that this command is dedicated for
programming the (n)PSK modulation function only and will have no effect on the PSK function.
Parameters
Name Range Type Default Description
<baud> 1 to
10e6 Numeric 10e3 Programs the baud of which the symbols stream in
the (n)PSK data table. Baud is programmed in units
of Hz.
Response