80 9 November 2001 Transmitters
Transmitter Frequency Response
Each Diamond Transport transmitter amplifies RF signal and
directly modulates a DFB laser diode to produce optical
output. Transmitter modules occupy one universal module
slot in the 3U-high Diamond Transport Shelf.
Housing The die-cast aluminum housing protects sensitive internal
circuits. The housing’s patented thermal design improves the
heat dissipation, extending product life and enhancing
reliability. An additional heat sink for the laser helps protect it
in high-temperature environments.
Internal Circuits Each transmitter module contains a variable attenuator,
adjusted automatically or manually, which lets you adjust the
RF drive level to the laser. RF signals are amplified and
pre-distorted before they reach the laser. Pre-distortion acts
to linearize laser performance by improving second order
distortions of the analog channels through distortion
cancellation.
Electronic control circuits inside the module maintain
constant optical output power and laser temperature, while
communicating the transmitter’s status to the optional
network interface card (NIC) on the Diamond Transport
shelf; the NIC serves as the interface with local or remote
monitoring systems.
The 800E-TX and 800G-TX series transmitters offer high
isolation on the auxiliary RF input to facilitate insertion of
local targeted video channels.
Transmitter Series Total Bandwidth Analog Bandwidth
200-TX 5-200 MHz 5-200 MHz
700-TX 45-750 MHz 45-550 MHz
800C-TX 45-862 MHz 45-862 MHz
800E-TX 45-862 MHz 45-650 MHz
800G-TX 45-862 MHz 45-862 MHz
210-QTX 5-200 MHz —
810-QTX 400-870 MHz —
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