Monitor!Rx-Params) - Receive-Parameters; Monitor!Event-Log) - Event-Log Or Stored Events - Comtech EF Data CDM-Qx Installation And Operation Manual

CDM-Qx Satellite Modem
Front Panel Operation
5.7.2.2 (Monitor%Rx-Params) – RECEIVE-PARAMETERS
Selecting Rx-Params displays the following submenu:
EbNo=05.7dB
F=+11.7k Buf=50% RSL=-24dBm
*
If the demodulator is locked, the following information appears on this screen:
Eb/No
BER
*F
Buf
RSL
If the demodulator is not locked, this screen shows the message '
Not Locked
CLEAR
Demodulator: Not Locked
*
5.7.2.3 (Monitor%Event-Log) – EVENT-LOG or STORED EVENTS
Selecting Event-Log displays the following submenu:
Stored Events:
View
Select View or Clear-All using the ◄ ► arrow keys, then press
Selecting View displays the following screen:
Log 023: 30/11/02 10:37:32
Fault - Demod Lock (3) (▲ ▼,ENT)
In this example, the demodulator installed in slot #3 is faulted on Nov. 30, 2002 at
10:37:32 with log number 23.
BER=3.4E-9
This shows the value of Eb/No calculated by the demodulator. The value referred to
here is the energy per information bit (Ebi), divided by the noise spectral density (No).
This is an estimate of the corrected BER.
The frequency offset of the received carrier, in kHz, with a displayed resolution of 100 Hz.
(Buffer fill state) This shows the fill state (in percent), of the receive Buffer. After a
reset, it will read 50. A value <50 indicates that the buffer is emptying, and >50
indicates that it is filling.
(Receive Signal Level) A value in dBm, indicating the input power of the desired
carrier, as seen by the demodulator. If the signal level is below the AGC range of the
demod, this will display RSL <-99
', but continues to display the receive signal level. Pressing
takes the user back to the previous menu:
F=+11.7k RSL=-24dBm
Clear-All (◄ ►,ENT)
5–46
Revision 6
MN/CDMQx.IOM
Demodulator:
or
ENTER
.
ENTER