User's Manual
Table Of Contents
- 1 System Overview
- 2 Features Summary
- 3 EXACT-V2 Rack
- 3.1 EXACT-V2 mechanics
- 3.2 Interface characteristics
- 3.3 Front Panel signalization (LEDs description)
- 3.4 Power requirements
- 3.5 Performances and technical characteristics
- 3.5.1 General characteristics
- 3.5.2 Control and data Ethernet interfaces
- 3.5.3 Serial control interfaces
- 3.5.4 ASI inputs / output and MPEG-TS processing
- 3.5.5 Digital modulation
- 3.5.6 Clock synchronization
- 3.5.7 RF and monitoring outputs
- 3.5.8 Digital precorrection
- 3.5.9 Power level measurement inputs and AGC
- 3.5.10 Dry contacts
- 3.6 Conformity with EC Directive
- 4 EXACT-V2 Installation
- 5 Operation
- 6 Maintenance & Troubleshooting
- Appendix A GPS Installation Recommendations
- Appendix B Example of GPS Antenna
USER
MANUAL
MPD-1611291-A
EXACT-V2 High End Rack Modulator / Exciter
3/10/2017
MPD-1611291-A
Page 19/94
2.3.2 Seamless Switching
The switching (and switching back) performed by the TS CleverSwitch between the
primary and the secondary stream is not expected to be seamless. However, if the
exact same data stream is present on both inputs (Primary & Secondary) then the
modulator performs seamless switching between inputs. Switching is made on a packet
basis.
2.4 Modulation Core
The modulator is fed by the active TS stream coming out of the CleverSwitch. It then
delivers IQ samples towards the Digital Pre-corrector.
From S110 version, it will support both ATSC 1.0 and ATSC 3.0 standards in the same
firmware. The user just selects the desired standard using a simple command.
In ATSC 1.0:
VCT (Virtual Channel Table) updates allows the user to change the major channel
number and carrier frequency.
In ATSC 3.0:
(Available from the S110 firmware version)
2.5 Test modes operation
2.5.1 PRBS sequence
A PRBS sequence can be internally generated and inserted at the input of the modulator
instead of an external MPEG-TS or IP Packets. The PRBS polynomial coefficients are
configurable.
2.5.2 Sinus tone generation
Two sinus tone modes are available: sinus and +6dB Boosted sinus. In these modes,
the output RF signal is replaced by a simple sinus wave at the RF frequency. The
boosted mode allows phase noise measurement without the requirement of an external
amplifier. Sinus tone generation should only be used if the exciter is being bench tested
(ie. not connected to the transmitter).
Note: Use of either sinus tone might damage the power amplifier.