Tabor Electronics 5251, User Manual, Page: 190 / 298

TE5251
User Manual
4-56
ASK Modulation
Programming
Use the following command for programming the ASK parameters.
ASK control is internal. The amplitude will toggle between two
amplitude settings at a rate determined by the baud value and
controlled by a sequence of bits in the ASK data table. The
commands for programming the amplitude shift keying function are
described below. Note that the carrier waveform frequency (CW)
setting is common to all modulation schemes.
ASK<amplitude>(?)
Description
This programs the normal amplitude setting. The amplitude shifts when the pointer in the data array points
to “1”.
Parameters
Name Range Type Default Description
<amplitude> 0 to 10 Numeric 5 Programs the amplitude setting in units of volt.
Response
The 5251 will return the present amplitude value. The returned value will be in standard scientific format (for
example: 100mV would be returned as 100e-3 – positive numbers are unsigned).
ASK:SHIFted<shift_ampl>(?)
Description
This programs the shifted amplitude. The amplitude shifts when the pointer in the data array points to “1”.
Parameters
Name Range Type Default Description
<shift_ampl> 0 to 10 Numeric 1 Programs the shifted amplitude setting in units of volt.
Response
The 5251 will return the present shifted amplitude value. The returned value will be in standard scientific
format (for example: 100mHz would be returned as 100e-3 – positive numbers are unsigned).
ASK:BAUD<rate>(?)
Description
This allows the user to select ASK word rate. The word rate is the interval of which the bit streams in the
ASK data array are clocked causing the output amplitude to hop from one level to shifted amplitude level
values and visa versa.
Parameters
Name Range Type Default Description
<rate> 1 to
2.5e6 Numeric 10e3 Programs the rate of which the frequency shifts from
carrier to shifted frequency in units of Hz.
Response