Transmitters 9 November 2001 85
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Tran sm it te r
DT-TX Series Controls, Indicators, and Connectors
Key Switch Safety key switch. Turn key to activate laser. See “Test Points and Controls.”
Optical Connector Ferrule or snap connector (under shield). Carries forward optical signal out
of the transmitter module.
Front Panel
AGC/MAN Switch Toggle switch. With 200, 700, and 800 series, turns automatic gain control
on or off. A customer-set option is available on the 800E and 800G. See
“Test Points and Controls.”
AGC LED Two-color (green/red) LED. See “LED Status Indicators.”
PWR LED Green LED. See “LED Status Indicators.”
LASER LED Amber LED. See “LED Status Indicators.”
MAN ADJ/Manual Gain
Control
Adjusts the RF drive level to the laser by ± 3 dB. (See “Test Points and
Controls.”) Used—on 800E-TX and 800G-TX—to adjust AGC level.
BIAS/Laser Bias Test
Point
DC test point (10 mV/mA). Measures laser bias current.
RF Test Point RF drive level monitor. Used to adjust the RF drive. See “Test Points and
Controls.” and specifications.)
DC Power Input 10-pin plug. Carries DC power into the transmitter.
Rear Panel
• Pins 1 and 2 –5 VDC
• Pin 3 Ground
• Pins 4 and 5 +5 VDC
• Pin 6 Ground
• Pins 7 and 8 Ground
• Pins 9 and 10 +24 VDC
Communications Edge connector. Connects to Diamond Transport shelf backplane. Carries
control information into and out of the transmitter module.
Main RF Input Connects to Diamond Transport shelf backplane. Allows primary RF signal
to enter the transmitter.
Auxiliary RF Input Connects to Diamond Transport shelf backplane. Allows auxiliary RF signal
to enter the transmitter.
RF Bandwidths:
• 5–200 MHz for 200-TX
• 550–750 MHz for 700-TX
• 550–862 MHz for 800C-TX
• 45–862 MHz for 800E-TX and 800G-TX.
Side Panel
SW3 & SW2 10-position switches used to configure the transmitter for Automatic
Shutdown. Set to accept logic signal from a specific 2RRX return receiver or
FRX forward receiver.
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