Setup Manual

Device View Description
R&S
®
Tx9
153Operating Manual 2109.9110.02 ─ 07
To operate the transmitter with an integrated GPS receiver, an appropriate software
option must be activated using an option code.
The following options are available:
●
Feed of an external PPS signal (pulse per second)
●
Use of an integrated GPS receiver (requires option key)
If the time reference fails during operation, the exciter can revert to its integrated fre-
quency control function (see the chapter "Frequency Control") and calculate a highly
precise PPS internally.To do so, the exciter only needs to be able to synchronize with a
PPS once for a few seconds after it has started.
If the time and frequency reference fail at the same time, Holdover Mode becomes
active. In this operating mode, the accuracy of "time of transmission" control depends
on the frequency stability of the integrated, temperature‑stabilized 10 MHz crystal oscil-
lator (OXCO).
Since, in Holdover Mode, calculation of the time of transmission becomes increasingly
inaccurate over time, the output signal of the exciter can be switched off after a config-
urable Guard Time.
Special features
With ATSC, up to three different synchronization types are supported.
An appropriate software option must be activated using an option code for the respec-
tive synchronization type.
●
R&S Mobile
If mobile content is transmitted and a Rohde & Schwarz AEM100 Emission
Mux/SFN inserter is used, the "RSMobile" synchronization type must be selected.
●
R&S A53
If normal content is transmitted and a Rohde & Schwarz AEM100 Emission
Mux/SFN inserter is used, the "RSA53" synchronization type must be selected.
●
A/110
In the case of the standard‑conforming SFN synchronization corresponding to
ATSC A/110B, the "A/110" synchronization type must be selected. It contains a
compatible expansion to allow use of Mobile DTV.
With the synchronization types "R&S Mobile" and "A/110", a distinction is also made as
to whether the time of transmission is to be synchronized primarily using data from the
TCP information or using data from the dummy bytes.
Setting and display of time of transmission
In the "Device View (Home)"
> "Transmitter" > "Exciter" > "SFN Regulation" menu
("SFN Delay" tab), the time of transmission is displayed relative to the reference time.
The time of transmission can be adapted individually by setting an additional static
delay.
Exciter ATSC