User manual

F-12 Appendix F: Redundant Backup
Moseley SL9003Q 602-12016 Revision G
Using a Starlink with TPT-2
Figure F-6 gives the details for Starlink NMS wiring to the TPT-2 for the transmitter and external
switching for the receiver. Starlink-to-TPT2 interconnection cables are available from Moseley;
part numbers 230-12225-01 for the transmitter and 230-12416-01 for the receiver.
Transmitter NMS Receiver NMS
BLK
8
7
6
5
4
3
2
1
+15V
DGND
TX_XFER_OUT
DGND
TX_XFER_IN
GRN
RED
GRY
TPT-2QAM NMS I/O XFER
(RJ45-8PIN)
GND
A (Status)
B (Control)
C
SHIELD
(Spade Lugs)
TX_XFER_OUT
TX_XFER_IN
I/O Levels Logic
TTL
TTL
HIGH=TX OK
LOW=TX RADIATE
BLK
BLU
8
7
6
5
4
3
2
1
+15V
DGND
RX_XFER_OUT
DGND
RX_XFER_IN
ORG
QAM NMS I/O XFER
(RJ45-8PIN)
GND
Status
Control
RX I/O-Generic
SHIELD
(Tinned Leads)
RX_XFER_OUT
RX_XFER_IN
I/O Levels Logic
TTL
TTL
HIGH=RX OK
HIGH=TRANSFER (MUTE RX)
Figure 8-6 Starlink TX & RX NMS-Transfer I/O Connection
For use with the TPT-2 the Starlink transmitter NMS card requires modification for compatible
logic levels. Remove the NMS card. Install a 10 kohms resistor for R33. On Jumper E4 select
12V. This entails cutting the trace between pins 1 & 2 and wiring between pins 2 & 3 on E4.
Transmitter
Figure F-7 shows a typical Starlink Digital Composite (STL) Main/Standby configuration using a
PCL series analog composite STL as backup.
In using the TPT-2 for this hybrid digital/analog backup configuration the logic is such that the
PCL series STL must be connected to TRANSMITTER A as shown below in Figure F-7. The
TPT-2 allows the user to select either Transmitter A or Transmitter B as the Main Transmitter.
Select Transmitter B as Main and Transmitter A as Backup to select the Starlink as the main
link.
Set the Starlink system to operate in Cold-Standby mode. In this mode the transmitter is not
radiating unless selected to correspond to the TPT-2 operation.
The Starlink-to-TPT-2 transfer control cable is available from Moseley for this configuration
(203-12225-01), although a cable can be made from a shielded RJ-45 (Black Box p/n
EVNSL60-0006). This is a 6 foot cable that can be cut, and the ends tinned to provide the
signals for the indicated connection. Be sure to maintain the shield performance by connecting
to ground. The high RF levels in typical STL receiver environments can cause problems.