Front Panel Operation
CDM-500 Closed Network Satellite Modem
6–22
Rev.
1.3
6.8.7
(MONIT) RX-PARAMS (Receive Parameters)
RX:EbNo=5.7dB dF=+11.7k
BER=3.4E-9 BUF-FILL=50%
If the demodulator is locked, this screen shows the following:
Eb/No 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).
dF This is the frequency offset of the received carrier, in kHz, with
a displayed resolution of 100 Hz.
BER This is an estimate of the corrected BER. This figure is derived
from an accurate measurement of the uncorrected error rate
(from the Viterbi decoder), applied to a look-up table.
BUF-FILL (Buffer fill state) This gives the value, in percent, of the current
fill state of the Plesiochronous-Doppler Buffer. Following a
reset, it will read 50%. A value < 50% indicates that the buffer
is emptying, and >50% indicates that it is filling.
If the demodulator is not locked, this screen shows the message ‘DEMODULATOR
NOT LOCKED’. Pressing ENTER or CLEAR will take the user back to the previous
menu.
Summary of Contents for CDM-500
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