12/20/11 888-2595-001 2-17
WARNING: Disconnect primary power prior to servicing.
Section 2 Installation
ZX Series
2.11.1 Exciter Connections
Connections between the exciter and amplifier chassis must include an RF drive coaxial
cable and a D-sub 15 cable for the purpose of logic control. When multiple PA chassis
are present, the parallel logic connection to all chassis is made via a five-way DB15
divider board mounted on the transmitter cabinet component panel.
In the case of the FlexStar HDx exciter, the D-sub 15 cable to the exciter has a direct 1:1
connection between the pins at each end. In the case of the Digit or MicroMax exciter, a
purpose-built cable with a special pinout is used to ensure the FM mode is selected at all
times.
THE D-SUB 15 CABLE USED FOR THE MICROMAX AND DIGIT EXCITERS HAS A
DEFINITE AMPLIFIER END VS. EXCITER END. THAT IS, IT CANNOT BE REVERSED
END-TO-END. PAY CAREFUL ATTENTION TO THE CABLE LABELING WHEN
INSTALLING THIS CABLE.
When a main/alt exciter switcher is present, a special interface breakout cable is
supplied to allow the optional web remote control to switch exciters and monitor switch
status.
INTERLOCK B Connect pins A and B to allow
transmitter to turn on.
GND Input
SYS FWD MTR
Forward power sample, power
scaled. 1k source impedance.
2V = 20kW
1V = 10kW
.5V = 5kW
7 Output
SYS REV MTR
Reverse power sample, power
scaled. 1k source impedance.
2V = 2000W
1V = 1000W
.5V = 500W
.25V = 250W
8 Output
Table 2-3 Remote Terminal Board (D-sub 9 and screw terminals, cabinet rear
area, component panel ZX7.5 & ZX10 only).
Designation Remarks Pin
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