BEI Electronics LLC 7EPTX-AM5E Manual Do Utilizador

2-20

2-83.

Emergency Off Indications.  The emergency off indicator provides a signal to indicate

when the transmitter is operated to off by any condition or event other than the use of the

off switch.  These conditions/events include:  1) an overcycle off condition, 2) a power sup

ply emergency condition, or 3) an open interlock condition.  A power supply emergency con

dition is when all the power supplies in the transmitter encounter faults.  The emergency

off indicator is located at J2-24.  The indicator will go LOW (0 volts dc) to indicate when an

emergency off condition is encountered.

2-84.

WIRING.

2-85.

Wiring consists of connecting audio, the RF transmission line, and ac power to the trans

mitter.  Refer to the following text and connect the wiring to the transmitter.

2-86.

AUDIO INPUT CONNECTION.  

The AM-2.5E and AM-5E transmitters are equipped

with electronically balanced 600 Ohm left and right channel audio inputs.  The audio in

puts are located on the transmitter top-panel at J3 (refer to Figure 2-8).  The inputs are

designed to accept a +10 dBm signal at 600 Ohms.

WARNING

WARNING

ENSURE PRIMARY POWER IS DISCONNECTED BE

FORE PROCEEDING.

2-87.

Audio is interfaced to the transmitter by: 1) selecting the appropriate cable and 2) connect

ing the cable to the terminals of 9-pin D-type connector J3.  J3 is located on the transmit

ter top-panel.  To interface audio to the transmitter: 1) use Belden 8760 cable or equiva

lent and 2) refer to Figure 2-8 and connect the audio to the transmitter as follows:

1. Connect the plus signal line to the + terminal.
2. Connect the minus signal line to the - terminal.
3. Connect the shield to ground at the audio source end.

2-88.

EXTERNAL STEREO RF INPUT.  

The transmitter is equipped with an external stereo RF

input on the transmitter top-panel (refer to Figure 2-9).  The input is designed for the con

nection of an external stereo generator or reference oscillator with a signal level from 5 to

15 volts peak-to-peak.  If an external stereo signal/reference is to be applied to the trans

mitter, connect the signal to the EXTERNAL RF INPUT connector on the transmitter

top-panel and program jumper P7 on the exciter circuit board in position 1-2.

2-89.

AM-2.5E/AM-5E RF TRANSMISSION LINE CONNECTION.  

The AM-2.5E/AM-5E

transmitter RF output connection is located on the transmitter top-panel (refer to Figure

2-9).  The AM-5E requires 7/8 inch transmission line with a 7/16 male DIN connector.

The AM-2.5E requires 1/2 inch transmission line with a 7/16 male DIN connector.  To con

nect the RF transmission line to the transmitter, refer to Figure 2-9 and connect the 7/16

male DIN type connector to the RF OUT connector on the transmitter top-panel.

2-90.

EXTERNAL INTERLOCK.  

The AM-2.5E/AM-5E is equipped with an external interlock

such as for a test load.  The interlock will turn off the transmitter RF output when opened.

The interlock is located at J1-24 and J1-25 on the transmitter top-panel.  Refer to 

External Interlock Input and Interlock +5v in the REMOTE CONTROL section of the

preceding text and perform the procedures to connect equipment to the transmitter exter

nal interlock.

2-91.

MODULATION MONITOR.  

The modulation monitor connection is located on the trans

mitter top-panel.  Refer to Figure 2-9 and connect the modulation monitor to the MOD

MONITOR SAMPLE OUTPUT receptacle.