RFL Electronics 9780 - Page 37

R F L 9780/R F L 9785 R eflected
Power Meter
Traditionally, reflected power is measured at the line
tuner by use of an SWR meter. Reflected power
measurement is generally performed during com-
missioning, and possibly when analyzing carrier
channel performance.
With the RFL 9780/RFL 9785 built-in Reflected
Power Meter, reflected power can be measured at
any time. The metered value is available remotely
as well as locally and the carrier channel perfor-
mance at all line ends can be evaluated from one
location.
Transmitter
Line Tuner
Impedance Matching
Transformer
SWR Meter
Single Carrier Application
For dual-carrier applications, reflected power is of-
ten measured at the line tuner as for a single carrier
application.
In this case, the reflected power reading displayed
in the RFL carrier equipment will be different than a
value measured at the line tuner due to different fre-
quency, circuit losses and signal voltage levels.
Dual-carrier application
The advantage with the built-in reflected power
meter is that the true loss, as seen by each
carrier set, is measured.
Field Upgrade of Existing Carriers
Existing RFL 9780/RFL 9785 carrier sets are field
upgradable to provide this feature. Upgrades to
the 9780 will require replacing the SOG/IRIG
module, RF Power Output Filter and the CLI Level
Indicator modules. Upgrading the 9785 involves
replacing the SOG/IRIG filter, TRDGT modules.
An interconnecting harness is provided to route
the transmit, and receive signals to the Sequence
of Events module for processing.
4
Transmitter #1
Reflected Power
Transmitter #2
Reflected Power
X
Line Tuner
Impedance Matching
Transformer
SWR Meter
Incident W ave F1, 30dB
Reflective Wave F1, Less 6 dB
Reflected Power = ?
Incident W ave F2, 30dB
Reflective Wave F2, Less 6 dB
Reflected Power = ?
Incident Wave GM
F
Reflective Wave GM
F
Reflected Power = ?
RF Power Output Filter
CLI Level Indicator
Sequence of the Events Module
Please contact RFL Customer Service Depart-
ment for additional information.
RFL Electronics Inc.
(973) 334-3100
February 2003