12/20/11 888-2595-001 2-19
WARNING: Disconnect primary power prior to servicing.
Section 2 Installation
ZX Series
In the case of a FlexStar HDx exciter being used to transmit HD Radio, an RF sample of
the transmitter output for the RTAC correction system must also be installed.
Additional cables, an RF splitter, and an attenuator are provided for this purpose.
Consult the System Interconnect drawing in the accompanying drawing package for
more information.
EXC_SUM_FAULT Exciter grounds pin to signal
it has internal alarm
, or
exciter switcher grounds pin to
signal an emergency exciter
switchover has occurred.
6 Input
N/C No connection 7 n/a
PA_APC Analog voltage from
transmitter to control exciter
output power. (FlexStar HDx
exciter: Typically not used for
FM-only service, which
utilizes internal AGC/bias
voltage power control)
8 Output
MUTE Transmitter grounds pin to
mute exciter output.
9 Output
EXC_B_ON_AIR Used by main/alt exciter
switcher to inform web remote
that reserve exciter is
selected.
logic high = exciter B selected
logic low = exciter A selected
10 Input
POS_A_SELECT Web remote grounds pins to
command main/alt switcher to
select main exciter.
11 Output
POS_B_SELECT Web remote grounds pins to
command main/alt switcher to
select reserve exciter.
12 Output
N/C No connection 13 n/a
N/C No connection 14 n/a
EXCITER_READY Exciter grounds pin to mute
transmitter while switching
modes (FlexStar HDx exciter
only).
15 Input
Table 2-4 EXCITER INTERFACE (D-sub 15, amplfier rear)
Designation Remarks Pin
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