SMD 989
– User Manual
Page 16 (105)
SMD 920 Option (L-Band Output)
The SMD 920 module provides an L-Band output to either the SMD910 or SMD 912(A) modulator
boards. The SMD 920 must accompany either an SMD 910 or SMD 912(A) modulator board in
the SMD 989 platform. Inputs to the SMD 910 or SMD 912(A) are described on the previous page
of this manual. The SMD 920 module receives an IF input from the SMD 910 or SMD 912(A) and
upconverts it to an L-Band frequency output. A short jumper cable from the IF OUT to the IF IN
jacks is needed. The IF Input to the SMD 920 L-Band upconverter board is auto detected and
must be either a 70MHz or 140 MHz carrier. Therefore, the SMD 910 or SMD 912(A) must be set
to output either 70 or 140 MHz for use with the SMD 920. The L-band Output frequency is user
settable from 950 to 2150 MHz.
IF OUT
IF IN
1
2
3
4
DATA IN
L-BAND OUT
MON
PRI
ASI IN
Figure 6: SMD 920 L-Band output - shown with SMD 910
The SMD 920 in combination with the SMD 910 modulator option has six different types of I/O as
shown in Figure 6.
Data input (RJ45 10/100/1000 auto detect speed & status)
ASI inputs (75 ohm BNC connector x4)
IF output (75 ohm BNC connector)
Upconverter IF input (75 ohm BNC Connector)
L-band primary output (50 ohm SMA connector)
L-band monitor output (50 ohm SMA connector -20 dBc from primary)
The SMD 920 in combination with the SMD 912(A) modulator option as 7 I/Os (Figure 7).
Figure 7: SMD 920 L-Band output - shown with SMD 912(A)
Data input (RJ45 10/100/1000 auto detect speed & status)
ASI inputs (75 ohm BNC connector x2)
Monitor output 1100MHz, -50 dBm (75 ohm BNC connector)
IF output (75 ohm BNC connector)
Upconverter IF input (75 ohm BNC Connector)
