Front Panel Operation
CDM-500 Closed Network Satellite Modem
6–8
Rev.
1.3
manufacturer’s modems. (Early versions of the modem did not incorporate this feature -
see the INFO, MISC section for details)
6.5.11
(CONFIG) RX (Receive)
RX: MOD FRQ DATA FEC ACQ
DESCRAM CLK BUF RSI Eb/No
The sub-branches available are:
6.5.12
(CONFIG, RX) MOD (Modulation)
SELECT RX MODULATION:
BPSK QPSK (PRESS ENTER)
Select BPSK or QPSK modulation, using the LEFT/RIGHT arrow keys, then press
ENTER.
6.5.13
(CONFIG, RX) FRQ (Frequency)
EDIT RX FREQUENCY:
72.2345 MHz (PRESS ENT)
Edit the receive frequency by selecting the digit to be edited, using the LEFT/RIGHT
arrow keys. Change the value of the digit using the UP/DOWN arrow keys. Press Enter.
The range of frequencies is from 52 - 88 MHz (70 MHz factory option) or 104 - 176
MHz (140 MHz factory option).
6.5.14
(CONFIG, RX) DATA (Data Rate)
EDIT RX DATA RATE:
64.000 kbps (PRESS ENT)
Edit the receive data rate by selecting the digit to be edited, using the LEFT/RIGHT
arrow keys. Change the value of the digit using the UP/DOWN arrow keys. Press Enter.
The overall range of data rates is from 2.4 to 512 kbps. NOTE: The minimum and
maximum data rates are dependent on modulation type and FEC decoder rate. If the user
changes the modulation or FEC, and the currently selected data rate is then invalid, it will
be adjusted automatically.
6.5.15
(CONFIG, RX) FEC (Forward Error Correction)
SELECT FEC DECODER RATE:
1/2 3/4 7/8(PRESS ENT)
Select either Rate 1/2, Rate 3/4 or Rate 7/8 encoding rate, using the LEFT/RIGHT arrow
keys, then press Enter.
Summary of Contents for CDM-500
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