Mocomtech CDM-570 - Manual (Page 139)

CDM-570/570L Satellite Modem with Optional IP Module Revision 4
Front Panel Operation MN/CDM570L.IOM
6–15
6.7.5 (CONFIG, TX) FREQUENCY
Edit the Transmit IF Frequency. This is accomplished by selecting the digit to be edited
using
◄ ► arrow keys. The value of the digit is then changed using the ▲ ▼ arrow keys.
The user should then press ENTER.
For the CDM-570L, the range of frequencies is from 950 to 1950 MHz, with a resolution
of 100 Hz. Furthermore, if, using the ODU, BUC menus, the user has selected a BUC
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 Transmit RF
frequency of the modem/BUC combination:
As the Tx IF frequency is edited the RF frequency will automatically be updated.
However, for the CDM-570, the range of frequencies permitted is from 50 to 90 MHz,
and from 100 to 180MHz, with a resolution of 100 Hz , as shown below:
Note the leading zeros, which are included to maintain compatibility with the CDM-570L
software.
6.7.6 (CONFIG, TX) ON/OFF
Select either On, Off, or Rx-Tx Inhibit, using the
◄ ► arrow keys, then press ENTER.
When Rx-Tx Inhibit is selected, it will prevent the TX carrier from being
transmitted, until the demodulator is locked.
To avoid the Tx Carrier from being turned off when the demodulator loses lock for a very
short period of time, the demodulator must be unlocked continuously for a period of 10
Tx IF Freq:1156.3456 MHz
(
◄ ►,▲ ▼,ENT)
Tx IF Freq:1156.3456 MHz
RF=14156.3456(
◄ ►,▲ ▼,ENT)
Tx Output State: Off On
Rx-Tx Inhibit(
◄ ►,ENTER)
Tx IF Freq:0085.1234 MHz
(
◄ ►,▲ ▼,ENT)