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3–8

FM4000 User’s Manual

3.4 Rear Panel connections

The Transmitter Controller has several types of connections on the rear panel of the 

unit. The following will describe each type and what it is used for. See illustration 

3-8 for location of each connector. Refer to Section 2.6 illustrations 2-7 and 2-8 for 

detailed descriptions of each applicable remote control connector.

3.4.1 DB-25

There are six (three, dual vertically stacked) DB-25 female connectors on the back of 

the Transmitter Controller. PA1 and PA2 are what is used to connect to the DB-25 

remote I/O on the back of each PA using the supplied DB-25 Male-to-Male cables. 

The connectors labled PA3, PA4, and PA5 are not used for the FM4000.

The last connector labled I/O Port A is used for the Remote Interface and has the final 

output metering information as well as the system controls for power control and high 

voltage control. See illustration 2-7 on page 2-7 for a detailed description of what 

each pin is used for.

3.4.2 DB-37

There are two (one, dual vertically stacked) DB-37 female connectors on the back 

of the Transmitter Controller. Port B is used for the Remote interface and has all the 

metering channels found on both PA1 and PA2 routed to this connector. 

Port C is not used on the FM4000. See illustration 2-8 on page 2-8 for a detailed 

description of what each pin is used for.

3.4.3 DB-9

There is one DB-9 female connector and one DB-9 male connector (vertically 

stacked) on the back of the Transmitter Controller. The port labled Directional 

Coupler is used to connect to the directional coupler mounted at the output of the 

combiner. It's primary function is to bring into the controller the forward and 

reverse power information that the controller uses to display on the front panel 

meter. It's secondary function is to provide a supply voltage to the temperature 

sensor located inside the connector shell of the cable that connects to the 

directional coupler for cabinet temperature reading available on I/O port A. It also 

provides fan voltage as well for cooling the coupler. The port labled power control 

is not used in the FM4000.

Illustration 3-8 Rear panel connections

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