12/5/07
888-2621-001
1-11
WARNING: Disconnect primary power prior to servicing.
Section I Operator Guide
Z3-48HD+
1.3.6
Drive Functions
Exciter muting and main/alternate functions are controlled by transmitter C of the Z3-
48HD+. This is the cabinet on the left in a typical layout.
Exciter Main/Alternate control can be accessed through the transmitter C controller
LCD display screen. From HOME, press STATUS/MORE/EXCITER/SWITCH.
Observe status ON indicators for exciter 1 or exciter 2.
For exciter main/alternate operation, all exciters’ AC should be on at all times
regardless if a TX is shut down. This is accomplished by a separate AC feed for
transmitters and exciter(s). Transmitter C contains a separate AC input for the exciters.
The System Controller should also operate from a separate AC feed from the
transmitters. The System Controllers are usually located in a separate rack with a
separate AC feed.
When transmitter C is turned on, the power supply starts to ramp up and as soon as it is
at full voltage, the mute line is pulled low by an open collector output and un-mutes the
on air exciter as determined by transmitter C. The Auxiliary output of the Flexstar HDx-
FM exciter is always ON (un-muted) and operating in the mode established within the
exciter. This signal is routed through the transmitter C Exciter Switch Board to a splitter
SP2 located in transmitter A (center cabinet). The outputs of this splitter go to the inputs
of the Exciter Switch Boards in transmitter A and transmitter B. If two Boost Pro
amplifiers are used in each transmitter A and transmitter B, the signal is switched
between the two Boost Pro inputs by the Exciter Switch Boards. The Exciter Switch
Board also controls the output of each Boost Pro by selecting the on air Boost Pro’s
output and routing it to the transmitter IPA stages. If only one Boost Pro is in each
transmitter, the controller of that transmitter will be set for only one RF source through
the LCD display screen and the Exciter Switch Board will not switch.
If during operation, the on air exciter fails, a ten second window exists to allow the
exciter to retry and come back on line by itself. If after 10 seconds power still does not
exist, a command from transmitter C Life Support Board switches the exciter outputs to
the backup exciter, restoring RF drive to all transmitters.
If transmitter C is turned OFF and should a failure occur in the on air exciter, automatic
switching of the exciter’s auxiliary output will not occur but will continue to try to use
the Auxiliary output from the exciter that was on air. When transmitter C is turned back
ON, automatic switching will make the switch. If a long term OFF state is expected on
transmitter C, the auxiliary outputs can be manually changed for RF drive to
transmitters A and B. If power is removed from transmitter C, the Exciter Switch Board
will switch back to exciter 1 outputs but still using the always on auxiliary output.
Should the backup exciter’s auxiliary output be needed to keep transmitter A and B
operating, a manual change will be required as described earlier.
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