Specifications

SDM-309B Satellite Modem M&C and Interfaces
MN/U-SDM309B Rev. # 4-4–5
2. If the battery backed RAM failed the valid data test the modulator, demodulator,
and interface modules would be tested to determine if valid configuration
information was retained by them. If valid configuration information was
retained by a module, that module’s configuration will be stored in the battery
backed RAM and maintained from that point on.
3. If battery backed RAM failed the valid data test and a module fails the valid data
test a default configuration for the module is stored in battery backed RAM and
maintained.
4.1.2.5 Modulator/Coder Defaults
TXA Transmit Filter A [1/2 (code rate), 64Kbps]
TXB Transmit Filter B [1/2 (code rate), 256Kbps]
TXC Transmit Filter C [1/2 (code rate), 768Kbps]
TXD Transmit Filter D [1/2 (code rate), 2048Kbps]
TXR Transmit rate selected “A” [1/2, 128Kbps]
TX_Freq Transmitter frequency [70MHz]
RF_Out RF Output [OFF]
TX_Power Transmit Power Level [-10dBm]
DifEncdr Differential Encoder [ON]
CW_Mode Continuous Wave Mode [OFF]
4.1.2.6 Demodulator/Decoder Defaults
RXA Receive Filter A [1/2 (decode rate), 64Kbps]
RXB Receive Filter B [1/2 (decode rate), 256Kbps]
RXC Receive Filter C [1/2 (decode rate), 768Kbps]
RXD Receive Filter D [1/2 (decode rate), 2048Kbps]
RXR Receive rate selected “A” [1/2, 128Kbps]
RX_Freq Receiver frequency [70MHz]
DifDecdr Differential Decoder [ON]
RFLoopBk RF Loop Back [OFF]
IFLoopBk IF loop back [OFF]
SWP_RACQ Sweep Reacquisition [0 Sec]
*SWP_CNTR Sweep Center [0 Hz]
*SWP_RNGE Sweep Range [50000Hz]
*SWP_DIR Sweep Direction [Forward]
BERTset BER Threshold [None]
*These windows only show up when Fast_ACQ (Fast Acquisition) has been turned
“ON” in the Utility menu.
4.1.2.7 Interface Configuration Defaults
TX_clock Transmit Clock [Internal]
Buf_Clk Buffer Clock [Satelite]
RX_clock Receive Clock [Normal]
Ext_Ref External Reference [1544KHz]
BBLoopBk Base Band Loop Back [OFF]