Chapter 11 DSNG Configuration
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317
Ellipse 3000 Release 3.0, Rev. B
Common Modulation Parameters
11.4.3
Spectrum Inversion
The Spectrum Inversion parameter sets the calculation method of the TX RF frequency parameter.
NOTE:
Although a modulation parameter, thus available for both IF and L-Band, the spectrum Inversion
calculation does not affect the IF frequency rate.
The TX RF Frequency parameter value is calculated according to the L-band Frequency and RF
Conv. LO Frequency parameter value. The Spectrum Inversion parameter determines whether the
TX RF Frequency parameter value will be calculated by addition or subtraction.
For example, if Spectrum Inversion is set to direct, L-Band frequency is 14,000,000 kHz and LO
frequency is 950,000 kHz then the TX RF frequency is 14,950,000 = 14,000,000+950,000.
The available options are:
■
Direct
– The TX RF frequency is calculated as the sum of the L-Band Frequency and RF Conv. LO
Frequency parameters.
■
Inverted
– The TX RF frequency is calculated after subtracting the L-Band Frequency from the
RF Conv. LO Frequency parameter values.
The Spectrum Inversion default is
Direct
.
Front Panel
To set the Spectrum Inversion parameter on the front panel:
❖
Navigate
Root > IF
or
L-Band Modulation > Spectrum Inversion
.
Web Manager
To set the Spectrum Inversion parameter in the Web Manager:
❖
Select
DSNG > MODULATOR AND UPCONVERTER
(see Figure 11–2 or Figure 11–3).
Spectrum Inversion
ƒ Direct
‚ Inverted
