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Chapter 5
Operating
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E-2
"External 1pps" mode
The OCXO runs in controlled mode.
The 10 MHz frequency of the OCXO is synchronized with the external seconds pulse. In
this mode, for example, SFN operation is possible without separate feed of a 10 MHz ref-
erence.
this mode, for example, SFN operation is possible without separate feed of a 10 MHz ref-
erence.
"Internal GPS" mode
The OCXO runs in controlled mode.
The 10 MHz frequency of the OCXO is synchronized with an optional internal GPS receiver.
10.1.2
Operation in Single-Frequency Network (SFN)
The following settings are permissible for operation in SFN mode:
– External 10 MHz: Requires an external 10-MHz clock and an external PPS
– External 1pps: Requires a feed from an external seconds pulse (PPS pulse)
– Internal GPS: (Possible only if GPS option installed) requires an external GPS antenna
– External 1pps: Requires a feed from an external seconds pulse (PPS pulse)
– Internal GPS: (Possible only if GPS option installed) requires an external GPS antenna
to be connected
10.1.3
Holdover Mode (If Reference Frequency Fails)
As soon as a failure of the external reference frequency is detected, the control voltage for
the OCXO is no longer modified. The result of this is that the RF generation is now based
on the stability of the OCXO.
the OCXO is no longer modified. The result of this is that the RF generation is now based
on the stability of the OCXO.
As soon as the external reference frequency is restored, the control voltage on the OCXO
will be controlled again with the externally supplied reference frequency.
will be controlled again with the externally supplied reference frequency.
10.2
TV Settings > Reference > GPS Submenu
The menu windows in the TV Settings > Reference > GPS menu contain information for
operation of the internal optional GPS receiver as a frequency and time reference. There is
also a setting to allow an active GPS antenna to be supplied with power from the transmit-
ter.
operation of the internal optional GPS receiver as a frequency and time reference. There is
also a setting to allow an active GPS antenna to be supplied with power from the transmit-
ter.
The information on the accuracy of the position and time determination and the number and
quality of the received satellites allows the suitability of the antenna location to be assessed.
It is therefore used for planning and control purposes.
quality of the received satellites allows the suitability of the antenna location to be assessed.
It is therefore used for planning and control purposes.
Menu windows
The GPS menu branches to the following menu windows: