5
5-22 Flex Max901e 1GHz Trunk and Bridger Amplifiers 1502154 Rev D
Two Person Return Balancing
Figure 5.11
Return Balancing
Cascade
Note This method of return balancing requires two technicians communicating
between two successive amplifier locations. Balancing signals are injected into a
forward path output testpoint of the Balancing Amplifier and measured at the return
input testpoint of the Measuring Amplifier.
CAUTION RF signal levels greater than +45 dBmV @ 1 NTSC channel loading at the
hybrid can damage amplifier active components. Derate maximum input level
according to actual channel loading (for example, +26 dBmV @ 79 NTSC channel
loading) (+26 dBmV = +86 dBµV).
Note The return path is not active until the PADs and return EQ accessories are
installed.
Note Testpoints are –20dB referenced to the associated port input or output level.
Refer to the housing label for testpoint loss.
Connect the signal level meter to the return
input testpoint of the associated input port.
Trunk Amplifier: connect the
signal generator to
PORT 4 FWD O/P TP
Return Path
Measuring Amplifier Balancing Amplifier
Bridger Amplifier:
connect the signal
generator to
P2/P3 FWD O/P TP
STATION REV EQ and
STATION REV PAD
plug-in location
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