Olson Technology OTPN-800CH - Manual (Page 4)

OPTICAL CONNECTORS AND CLEANING
POWERING
OPERATIONAL SETUP - RECEIVER (FORWARD PATH)
The standard optical connector is available in SC/APC or FC/APC type terminations.
The fiber ends can be damaged by the insertion of contaminated connectors. Some
types of customer damage to connectors are not covered under warranty. Fiber
connectors should never be left uncovered. Prepackaged alcohol wipes are the most
convenient means of cleaning optical connectors. Clean alcohol and lint free wipes or
swabs may also be used.
Apply only +12 V to either the “F” connector closest to the top cover of the unit, or
through a power inserter in series with the Main RF output connector, the “F” connector
closest to the outside edge of the housing. NOTE: The center conductor of the “F”
connector is “+” and the shield is ground.
The OTPN-800CH optical receiver as the last component in a specific optical link will
provide carrier-to-noise performance and an RF output level that is dependent on
several parameters. The RF input level to the source optical transmitter and the optical
input level to the OTPN-800CH basically determine the link performance.
The optimum RF input level to any optical transmitter is dependent on the number of
channels being transmitted. As the number of carried channels is lowered, the RF input
level to the transmitter can be raised. This results in increased RF levels at the OTPN-
800CH receiver. This improves the carrier-to-noise ratio over the link. Links should be
designed and transmitters should be set up using values that represent the maximum
number of channels likely to be carried.
The receiver output power is also affected by the amount of equalization used. The use
of a lower value equalizer will require reducing the output level as measured at the
highest channel. This is because the attenuation of the lower channels is reduced.
Table 1 assumes approximately 77 channels from 54MHz to 550MHz and digital loading
from 550MHz to 1,000MHz at -6 dB below the carrier. The OTPN-800CL does not have
a forward equalizer, and therefore has 0dB of slope (flat). This unit is designed to work
with short coax runs. Extended lengths of coax will cause down sloping (lower RF level)
of higher frequencies.
The left port is for the forward band receiver. The right port closest is for use with the
return band transmitter.
DC