5
5-6
Flex Max901e 1GHz Trunk and Bridger Amplifiers
1502154 Rev D
Calculating Balancing Carrier Levels
Typically, only the Forward High Balancing Carrier level will need to be calculated (if it is not
provided by the system manager). All other balancing carrier levels are near enough to the signal
levels of the bandedge carriers that bandedge levels may be used for balancing.
Perform this calculation only when the Forward High Balancing Carrier is not at the high bandedge
frequency. This calculation method can speed up the process of balancing and needs to be done only
once for all similar amplifiers within a cascade.
1.
Obtain a copy of the Amplifier Data Sheet from the system manager or make a copy from
the sample at the end of this manual.
2.
Calculate the Forward High Balancing Carrier level using the following equation.
L
C
= Forward High Balancing Carrier level (dBmV)
L
H
= system output level at the high bandedge frequency (dBmV)
L
L
= system output level at the low bandedge frequency (dBmV)
F
H
= system high bandedge frequency (MHz)
F
L
= system low bandedge frequency (MHz)
F
C
= Forward High Balancing Carrier frequency (MHz)
3.
Copy the Forward High Balancing Carrier level to the appropriate box in the Map Signal
Information section of the Amplifier Data Sheet.
Temperature Compensation
Typically, only the forward balancing carriers require temperature compensation. The effect of
temperature on the cable attenuation associated with the low frequency return balancing carriers is
minimal except in extreme conditions.
When the temperature surrounding an amplifier is between 50 and 90• F (10 and 32• C), balancing
carrier levels do not require temperature compensation.
If the temperature is less than 50• F (10• C) or greater than 90• F (32• C), perform temperature
compensation as follows:
L
C
L
H
L
L
–
F
H
F
L
–
----------------
F
C
F
L
–
(
)
L
L
+
×
=
Note
Temperature correction only applies to aerial cable. Use a 0 dB Temperature
Correction Value for all underground cable.
Tip
To compensate for cable loss due to temperature change, you can remember that
the percentage of change of cable loss is measured 1% for every 10° F (5.5° C) of
temperature change, or you can complete the procedure that follows.
Summary of Contents for Flex Max901e
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Page 3: ...Flex Max901e 1GHz Amplifiers Trunks FMTE and Bridgers FMBE 1502154 Revision D...
Page 10: ...viii Flex Max901e 1GHz Trunk and Bridger Amplifiers 1502154 Rev D...
Page 20: ...1 1 10 Flex Max901e 1GHz Trunk and Bridger Amplifiers 1502154 Rev D...
Page 56: ...4 4 20 Flex Max901e 1GHz Trunk and Bridger Amplifiers 1502154 Rev D...
Page 102: ...7 7 14 Flex Max901e 1GHz Trunk and Bridger Amplifiers 1502154 Rev D...
Page 142: ...B B 32 Flex Max901e 1GHz Trunk and Bridger Amplifiers 1502154 Rev D...
Page 146: ...C C 4 Flex Max901e 1GHz Trunk and Bridger Amplifiers 1502154 Rev D...
Page 160: ...D D 14 Flex Max901e 1GHz Trunk and Bridger Amplifiers 1502154 Rev D...
Page 164: ...E E 4 Flex Max901e 1GHz Trunk and Bridger Amplifiers 1502154 Rev D...
Page 170: ...Index 4 Flex Max901e 1GHz Trunk and Bridger Amplifiers 1502154 Rev D...
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