RFL Electronics Inc.
March 2005
RFL 9785
The RFL 9785 is an amplitude-modulated ON/OFF powerline
carrier transmitter/receiver terminal. It is based on three
generations of proven RFL technology, with enhanced
features to meet today’s market demands.
These features include improved RFI and surge withstand
capabilities (meeting the requirements of ANSI/IEEE C93.5),
ESD protection (per IEEE PC 37.90.3, 2001), available
redundant power supplies, increased flexibility through field-
programmable frequencies and logic, reflected power
measurement option, and no cost Windows
TM
web based user
interface.
The RFL 9785 is designed for directional comparison blocking
applications in high-speed protective relaying communications.
Its interface circuits are compatible with almost every
existing carrier blocking relay. One standard package is all
RFL 9785
Programmable ON/OFF Powerline
Carrier System
•
Complies to ANSI C93.5 Standard
•
Integrated Sequence of Events Option
•
Integrated Reflected Power Meter Option
Key Features and Benefits
you will need for most schemes. A complete 10 watt
transmitter/receiver is contained in a 19-inch chassis that
occupies three rack units of vertical rack space (5.25 inches,
or 13.3 cm). An optional voice service channel, checkback
module, sequence of events and redundant power supply can
also be added in the same 3U chassis. A functional block
diagram of a typical RFL 9785 terminal appears in Figure 2.
The RFL 9785’s transmit characteristics are set by rotary
switches on the transmitter module. These switches select
the operating frequency; which can be set from 30 kHz to 535
kHz, in 10-Hz steps.
The RFL 9785’s receive characteristics are set by DIP
switches on the receiver module. These switches provide an
operating frequency range of 30 kHz to 535 kHz, adjustable in
250-Hz steps.
•
Compact 50W and 100W Power Amplifier Options
•
Redundant Power Supply Option
•
Wide Range Programmable Filter