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11 - Digital modulation (Option UO1)
Modulation source
37
TGR2050 Series Instruction Manual
Modulation source
To set the modulation source, select the
Source
parameter window. Select the
required source and touch
OK
.
Internal modulation source options include Square pattern (1,0,1,0,1, 0….) PRBS
pattern (PN7, PN9, PN11, PN15) or a user defined pattern. See ‘Modulation pattern
generator’ for more details on how to use the user defined pattern generator.
Selecting an external modulation source uses the signal from the MOD IN/OUT
connector on the rear panel as the modulating digital data signal, if selected, no
further options will be available.
If MSK, GMSK, HMSK or GFSK are selected the modulation type, an external source
cannot be applied. When the source is external the bit rate is unknown, therefore
deviation cannot be automatically set to 0.25 x bit rate.
Internal bitrate
To set the internal modulation bit rate, select the
Int. Bitrate
parameter window.
Enter the required bit rate value, the bit rate can be entered in
mbps, bps, kbps
or
Mbps
. Select the required units and touch
OK
.
The minimum internal bit rate is 1mpbs, the maximum is 1Mbps.
Modulation triggering mode
To set the modulation triggering mode, select the
Mode
parameter window. The
options are
Immediate
or
Triggered
, see ‘Triggering’ for further details on the
triggering option. Select the required mode and touch
OK
.