5
5-20
Flex Max901e 1GHz Trunk and Bridger Amplifiers
1502154 Rev D
7.
Adjust the ALC:
a.
Set the
ALC/MAN
switch to the
ALC
position. Wait 30 seconds.
b.
Adjust the
ALC SENSITIVITY
control while observing the system high carrier on the
SLM. Clockwise decreases, counterclockwise increases the signal level. Stop
adjusting when the output at the high carrier reaches the Forward High Balancing
Carrier Level. If Temperature Compensation was used, balance in ALC mode for the
levels calculated before Temperature Correction Values were determined.
c.
Record both forward balancing carrier levels in the Balancing TP (ALC)
box of the
Forward Signal Levels table on the Amplifier Data Sheet.
8.
Measure the signal levels of both forward balancing carriers at all internal/external
testpoints and record these levels in the Forward Signal Levels table on the Amplifier Data
Sheet.
9.
Close the housing and replace the caps on all external testpoints. (Refer to
Return Balancing
For signals on the return path to arrive at the headend at the correct level and with as little distortion
as possible, the return path must be properly balanced. Properly balanced means that the return
signals on each leg arrive at each succeeding amplifier at the same level and tilt; this is called unity
gain. Balancing with unity gain ensures that all return signals, regardless of point of origination,
arrive at the headend at the same signal level. This keeps signal distortion at the lowest possible
level. In most systems, the return band will have a tilt of 0 dB between the low and high return
bandedges. The following sections cover the single person and the two person return balancing
procedures.
These procedures assume the requirements listed in
Forward Balancing Requirements
are met. When balancing the return path keep in mind the following:
■
The forward path must be balanced first and be trouble free.
■
The network must be free of ingress.
■
You are trying to achieve constant inputs at the
return input port
of each amplifier. To do
this you must adjust signal level and tilt in the return path through the use of return port
PADs, equalizers, and distribution accessories.
■
When using the single-person method, turn off the ALC, if present, in the return rack mount
receiver at the headend.
The following sections cover the single and two person balancing procedures.
Note
Because the
ALC SENSITIVITY
control has a limit of about 20 turns, the change
in output level may not be proportional to the size of adjustment using the
control.
Several complete rotations of the control may be required to observe a change in the
output level. When the control is near the operating range, small adjustments will
produce large changes in the output level. The control will click when you reach the
limit in each direction.
Summary of Contents for Flex Max901e
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Page 3: ...Flex Max901e 1GHz Amplifiers Trunks FMTE and Bridgers FMBE 1502154 Revision D...
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Page 20: ...1 1 10 Flex Max901e 1GHz Trunk and Bridger Amplifiers 1502154 Rev D...
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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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