RFL 9785
RFL Electronics Inc.
June 18, 2009
2-3
(973) 334-3100
2.3
FEATURES
Programmability
The transmit frequencies can be set over a range of 30KHz to 535kHz, adjustable in 10-Hz steps.
The receiver frequency range is 30kHZ to 535kHz, adjustable in 250Hz steps.
Output Range
The internal amplifier is rated at 10W. External amplifiers may be used to provide 50W or 100W
capability.
Saves Rack Mounting Space
Each RFL 9785 terminal is housed in a single chassis three rack-units high (5.25 inches, or 133mm),
including Sequence Of Events, Checkback and Voice options.
Station Battery Isolation
A dc-dc converter supplies regulated voltage to all RFL 9785 modules. All inputs and outputs are
made through optically-isolated transistors or electromechanical relays.
Flexible Block Outputs
Block outputs can be made through optically-isolated, high-current transistors, electro-mechanical
output relays, or both.
Compatibility With Existing Equipment
The RFL 9785 is backwards compatible with existing RFL 6785P units, as well as almost every
other existing directional comparison blocking relay presently in the field.
Carrier Level Indicator
The RFL 9785 continuously monitors incoming carrier level with a digital panel meter providing a
visual indication through the front panel. An output is provided for external indicators.
Voice Option
The voice option allows two-way voice communications along the protected line. It includes a
telephone handset and a pushbutton-controlled in-band signaling system. During a block, the voice
signal may be automatically canceled, so that the full output power of the terminal is dedicated to
the block signal.
Automatic Checkback Option
A Checkback Option allows automatic testing of up to four terminal lines. All checkback system
programming is done through an RS-232 port.
Reflected Power Meter
A built-in set of modules can automatically measure the amount of transmitted power reflected
back to the local receiver. The reflected power can be read locally or remotely using RFL Web
Commander or Hyper-terminal.