10 - Modulation
Analog Modulation
31
TGR2050 Series Instruction Manual
Modulation deviation/depth
When AM is selected as the modulation type, the
depth parameter will be set as a %.
To set the depth select the
Depth
parameter window and enter the required depth
and touch
OK
.
If the amplitude is currently set to greater than +7dBm then AM selection is not
allowed and a warning is issued. Change the amplitude setting before trying again.
NOTE
During AM operation ALC is turned off. Level control is calibrated when AM is
enabled and each time any parameter is edited while AM is enabled. Although the
rate of drift is very slow reset the level, frequency or any other parameter when best
level accuracy is required.
When FM is selected as the modulation type, the deviation will be set in Hz. To set
the deviation select the
Deviation
parameter window, enter the required deviation
value, the value can be entered in
mHz, Hz
,
kHz
, or
MHz
and touch
OK
.
When PM is selected as the modulation type, the deviation will be set in radians
(rad.). To set the deviation select the
Deviation
parameter window, enter the
required deviation value and touch
OK
.
Modulation source
To set the modulation source, select the
Source
parameter window. Select the
required source and touch
OK
.
Internal modulation source options are
Sine, Square, Ramp +ve, Ramp -ve,
Triangle
or
External
.
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.
Modulation frequency
To set the modulation frequency, select the
Int. Freq.
parameter window. Enter the
required frequency value, the value can be entered in
mHz, Hz, kHz
or
MHz
. Select
the required units and touch
OK.
