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CDM-Qx Satellite Modem Revision 5
Front Panel Operation MN/CDMQx.IOM
5–28
(ConfigRxFreq) – RX FREQUENCY
Edit the receive frequency. This is accomplished by selecting the digit to be edited, using
the WXarrow keys. The value of the digit is then changed using the STarrow keys. The
user should then press ENT. The range of frequencies depends upon the plug-in module.
The above examples shows the L-Band version of CDM-Qx.
If (using the ODU, LNB menus) the user has selected an LNB LO frequency (other than
zero) and defined whether the mix is high side or low side, the display will be modified
as shown below, to include the calculated Receive RF frequency of the modem/BUC
combination:
As the Rx IF frequency is edited the RF frequency will automatically be updated
(ConfigRxAcq) – DEMOD ACQUISITION RANGE
Edit the acquisition search range of the demodulator (the value entered here determines
the amount of frequency uncertainty the demodulator will search over in order to find and
lock to an incoming carrier). Editing the value is accomplished by selecting the digit to be
edited, , using the W Xarrow keys. The value of the digit is then changed using the
STarrow keys. The user should then press ENT.
The range varies from ± 1 kHz to ± 32 kHz for 70/140 IF, ± 1 kHz to ±(symbol rate/2) up
to ±200 kHz for L-Band. For symbol rates < 64 ksps, it will be ± (symbol rate/2)
The value entered here determines the amount of frequency uncertainty the demodulator
will search over in order to find and lock to an incoming carrier.
Rx IF Freq: 1156.3456 MHz
(◄ ►, ▲ ▼,ENT)
Demod Acquisition Range:
+/- 32 kHz (▲ ▼ ENT)
Rx IF Freq:1156.3456 MHz
RF=12156.3456 (◄ ► ▲ ▼ ENT)