Moseley Starlink SL9003Q, User Manual, Page: 127 / 141

Appendix F: Redundant Backup with TP64 and TPT-2 Transfer Panels F-7
Moseley SL9003Q 602-12016-01 Revision J
selected. If the Main receiver fails, the line will go LOW and input 2 will be selected (the
Standby receiver will then be active).
The Broadcast Tools switcher/router is configured internally with DIP switches to operate
from external control. The lid must be removed from the router to set DIP Switch 5–6 to the
ON position for remote control.
The transfer control cable is available from Moseley for this configuration (203-12416-01).
However, 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 RX XFER OUT signal
(RJ45 pin 6) 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.
F.4.2 Digital STL with Analog STL Backup using a TPT-2
System Considerations
Incompatible Modulation Formats
: The PCL series analog STL’s (or any analog STL) can
be used as a backup for the Starlink with awareness of how operational differences between
the two systems effect backup operation. The two systems have incompatible RF modulation
formats. The analog STL links (i.e., PCL series) use Frequency Modulation (FM) vs.
Quadrature Amplitude Modulation (QAM) for the Starlink digital STL links. An FM transmitter
will not work with a QAM receiver and visa versa.
This means the backup does not operate in the traditional redundant sense. Only one link
can be active at a time. The QAM STL receiver is valid when the QAM STL transmitter is
selected. The analog STL receiver is valid when the analog STL transmitter is selected.
For instance the transfer panel will switch to a back-up transmitter when a failure mode is
detected in the main transmitter. If the Starlink transmitter is selected as main and fails,
the Starlink receiver will automatically switch over to the analog backup receiver when it
fails to decode the analog transmission from the PCL6000 or 606.
If a receiver fails (at the receiver end), the back-up receiver will not be able to take over
until the transmitters are forced to switch to the compatible unit. In this case the
transmitter switchover can be accomplished through the use of a return telemetry signal via
remote control, which detects the failed receiver and sends back a control line to transfer at
the studio site.
Composite vs. Discrete Audio : The other issue is most typical PCL6000/606 links are set
for composite FM transmission. The Starlink SL9003Q is a discrete audio link and does not
support this type of composite baseband. The Starlink Digital Composite STL must be used
if intended to operate as a backup with a composite analog system.
Alternatively a PCL6000/606 composite STL system can be made compatible with a Starlink
SL9003Q Discrete Audio STL if it is first converted to a discrete digital system through the
use of a DSP6000. This will provide the discrete audio (left/right or digital AES) necessary
for switchover.
Using a TPT-2 Transfer Panel : The TPT-2 has the appropriate logic to work properly with
the PCL series STL transmitters. We therefore recommend using a TPT-2 transfer panel
when using the PCL series analog STL’s rather than the TP64 transfer panel for the hybrid
analog/digital backups.