Olson Technology FRMUC-T-6940 - Manual (Page 6)

025-000440 REV A Page 6
Step 9: Carefully check cable flexing and fit by closing the housing several times. Arrange cables as necessary to
ensure there are no problems.
NOTE:
If this installation is being done on an operating node, CONNECT THE FIBER TO THE TRANSMITTER
BEFORE PLUGGING-IN THE DC POWER CABLE FROM THE CONVERTER/TRANSMITTER.
If this installation is being done on a non-operating node, CONNECT THE FIBER TO THE TRANSMITTER
BEFORE APPLYING POWER TO THE NODE WHEN THE NODE IS INSTALLED.
DANGER--LASER RADIATION--DANGER
THIS UNIT EMITS INVISIBLE LASER RADIATION FROM THE LASER TRANSMITTER THAT
CAN CAUSE PERMANENT EYE DAMAGE
AVOID DIRECT EXPOSURE TO BEAM
APPLY AC POWER AND OPERATE ONLY WITH PROPER OPTICAL FIBER INSTALLED IN
TRANSMITTER CONNECTOR.
OPERATIONAL SETUP - RF
The converter accepts four separate return inputs, one from each feeder leg. It up-converts three of them to
three different bands, and combines them with one un-converted band. This combination of four bands plus a
pilot carrier at 4.5MHz is fed into the laser transmitter for return transmission via fiber.
If the FRMUC/T-6940 is installed properly, the frequencies of the four bands and their relationship to the four
feeder legs are as follows:
FEEDER PORT THREE BAND ONE 5MHz to 42MHz
FEEDER PORT FOUR BAND TWO 51.5MHz to 88.5MHz
FEEDER PORT FIVE BAND THREE 121.5MHz to 158.5MHz
FEEDER PORT SIX BAND FOUR 169.5MHz to 206.5MHz
The return carrier levels from each feeder leg into the converter should be checked and adjusted if necessary.
The levels from the four feeders can be checked at RTP3 through RTP6 and the levels can be padded with
RPAD3 through RPAD6 in the SA main RF chassis if necessary.
The specification for MAXIMUM carrier level into each converter band is defined as +15dBmV per (CW)
carrier with six carriers present. For best return optical system performance, the input level should be a MINI-
MUM of +12dBmV per (CW) carrier with six carriers present. The carrier levels may be adjusted as necessary
to provide channel-loading equivalent to the six-carrier levels.
Remember to factor-in the test point value when making carrier level measurement at the test points. The levels
mentioned above are ACTUAL levels at the feeder legs/converter inputs.