C-COR Flex Max901e - Forward and Return Field Testing

6
6-4 Flex Max901e 1GHz Trunk and Bridger Amplifiers 1502154 Rev D
Forward Field Testing
This procedure verifies that the amplifier:
■ is balanced to the correct forward signal levels
■ delivers the specified gain to forward RF signals
These procedures require the use of a signal level meter (SLM). A more comprehensive test involves
sweeping the entire bandwidth with an appropriate sweep generator/receiver—especially when
response problems are suspected.
➤ To field test the forward path
1. Set the ALC/MAN switch to the MAN position.
2. Connect an SLM to PORT 1 FWD I/P TP and measure the input signal levels of both forward
balancing carriers. Verify that the input signal levels are within reasonable tolerance of the
measurements made during the initial balancing procedure. If not, find the cause of the
variation external to the amplifier. Correct if necessary, then rebalance the amplifier.
Figure 6.1
Simplified Forward
Path Block Diagram
3. Measure the output signal levels of both forward balancing carriers at the output testpoints
of all active ports. Compare these current levels to the measurements made when the
amplifier was previously balanced. If these measurements are unacceptable, verify that the
proper accessories are still installed in all forward plug-in locations and replace any
accessories not in compliance with the Amplifier Data Sheet. If necessary, rebalance the
amplifier.
Note All measured signal levels must be temperature compensated to a common
temperature before they can be accurately compared. Refer to Temperature
Compensation on page 5-6 for information.
Note Do not terminate the unused port testpoint as it can affect testpoint accuracy.
Note The Operational Gain listed on a C-COR Amplifier Specification Sheet is the gain
at the high bandedge frequency and includes loss equal to the forward equalizer
plug-in value.
Port 1
Port 2
Port 3
Port 4
Port 5
Port 6
STATION
FWD EQ
STATION
FWD PAD
STATION
FWD EQ
PORT 4
REV I/P
TP
PORT 4
FWD O/P
TP
PORT 2/3
REV
I/P TP
PORT 2/3
FWD
O/P TP
PORT 5/6
REV I/P
TP
PORT 5/6
FWD O/P
TP
PORT 1
REV O/P
TP
PORT 1
FWD I/P
TP