SMD 989
– User Manual
Page 53 (105)
IF Output
Clicking on
“
Configure IF Options
” will produce a dialog box as shown in Figure 44.
The output can be set as active or mute.
The IF output frequency is selectable between 57 & 140 MHz in 1 Hz increments. When used
with the option SMD 920 RF Upconverter set the IF frequency to 70MHz or 140MHz and the level
to -10dBm.
The level for the IF Output is adjustable between -30 to -5 dBm for the SMD 910 and SMD 912.
The SMD 912A output level is from -20 to +5dBm. When feeding the SMD 920 option
upconverter the IF output level is optimal at -10 dBm for any of the modulator models.
The tilt adjustment allows a user to adjust the overall slope of the output spectrum. The range is
selectable from -3 to +3 dB.
RF Output
If the RF L-Band SMD 920 option is installed in the SMD 989
bay, an RF Output section is shown. The header selections
provide quick selection for Mute, Modulating, and RF Level.
Click on the field to activate. When mute is active no output
satellite carrier is output. When the Modulating field is clicked
the output modulation is removed and a carrier only is
transmitted. By clicking the up or down arrows the output RF
level can be increased or decreased incrementally.
By clicking on the
“
Configure RF Options,
” cog a dialog box
appears showing RF output selections as shown in Figure 45.
The output can be set as active or mute. This may also be
toggled by clicking on the Mute field in the Outputs header.
When mute is active no output satellite carrier is output.
The output frequency is settable at a range of 950 to 2150 MHz, When LO Offset is 0MHz.
The LO Offset (MHz) can be entered to allow the desired Satellite Frequency (MHz) to be
entered. The SMD 989 will output the proper frequency to achieve the correct satellite frequency
when combined with the external Upconverter LO (Local Oscillator). This eliminates the need to
determine what the output frequency of the SMD 989 should be to achieve the desired satellite
frequency. In the example settings below the output of the SMD 989 will be the same.
The output level is settable at a range of -30 to 5 dBm. This level may also be incremented to a
higher or lower level using the up/down arrows in the RF Level (dBm) header section.
Figure 44: IF settings
