Setup Manual

Device View Description
R&S
®
Tx9
47Operating Manual 2109.9110.02 ─ 07
Name Description Value range Access right
Guard Time Back Used to set a guard time which must elapse before the automatic
switchover function switches back to the preferred input if the input sig-
nal at the standby input fails. If seamless switching is possible, switch-
over always takes place immediately without interruption regardless of
the set guard time. If "to Reserve Only" was selected as the "Direc-
tion", the set guard time has no effect.
Maintenance
If Reserve Fails Used to determine whether the signal at the standby input is to be
monitored.
●
If the transmitter is operated with only one input signal or the
standby input is connected only temporarily, "Do Not Show Warn-
ing" must be selected.
●
If two redundant input signals are normally supplied to the trans-
mitter, "Show Warning" must be selected.
Do Not Show
Warning, Show
Warning
Maintenance
4.2.1.2 Automatic Exciter Switchover
The automatic exciter switchover function enables a faulty exciter to be automatically
switched over to a functional standby exciter.
In the "Exciter Automatic" menu it is possible to switch automatic switchover between
two exciters on and off and to select the basic operating behavior of the function. The
"Switch Mode" switch is used to select whether automatic switchover to a standby
exciter is to take place once only (Single Switch) or whether a switchback is also to be
performed if the standby exciter signals a fault, but the preselected exciter is no longer
faulty (Multiple Switch).
It is also possible to set a guard time which must always expire before a switchover
can take place. This prevents unwanted switchover operations resulting from brief fault
events.
Operation
One of the two exciters can be preselected for operation by pressing the exciter selec-
tor switch (or via the ExciterAuto -> Exciter Switch tab). This exciter is switched on
together with the output stage by pressing the
"Program Path On" switch (in the
"Transmitter" menu). If necessary, the RF of the standby exciter can be switched on for
measuring and monitoring purposes by pressing the "Reserve Path (on)" switch (in the
"Transmitter" menu). A switchover operation causes the standby exciter to become the
main exciter and vice versa. The ON/OFF switches then act on the other exciter in
each case.
"Single Switch" Mode
If a fault occurs in the preselected exciter, the automatic switchover function will swap
the main and standby exciter and display an "Automatic changed" message.
Either the new state can now be accepted by changing the "preselected exciter"
("Automatic changed" disappears) or the automatic switchover function can be reset to
its original state by pressing "Reset Faults" (in the "Transmitter" menu).
Transmitter