Config, Tx) Frequency; Config, Tx) On/Off - Comtech EF Data CDM-570 Installation And Operation Manual

CDM-570/570L Satellite Modem with Optional IP Module
Front Panel Operation
6.7.5

(CONFIG, TX) FREQUENCY

Tx IF Freq:1156.3456 MHz
Edit the Transmit IF Frequency. This is accomplished by selecting the digit to be edited
using
◄ ►
The user should then press ENTER.
For the CDM-570L, the range of frequencies is from 950 to 1950 MHz, with a resoluton
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:
Tx IF Freq:1156.3456 MHz
RF=14156.3456(◄ ►,▲ ▼,ENT)
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 resoluton of 100 Hz , as shown below:
Tx IF Freq:0085.1234 MHz
Note the leading zeros, which are included to maintain compatibilty with the CDM-570L
software.
6.7.6

(CONFIG, TX) ON/OFF

Tx Output State: Off
Rx-Tx Inhibit(◄ ►,ENTER)
Select either On, Off, or Rx-Tx Inhibit, using the
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
(◄ ►,▲ ▼,ENT)
arrow keys. The value of the digit is then changed using the
(◄ ►,▲ ▼,ENT)
On
arrow keys, then press ENTER.
◄ ►
6–13
Revision 3
MN/CDM570L.IOM
▲ ▼ arrow keys.