RFL 9780 RFL Electronics Inc.
April 8, 2003 2-15 (973) 334-3100
2.8.6.4 Limiter/Slicer Module
The signal is converted into a square wave, which is then sent to the detector circuit. The detector
is configured to provide a 90 degree phase shift at the center frequency. The shifted signal is then also
converted into a square wave. The pre- and post- discriminator square waves are combined to generate
a square wave of twice the baseband frequency. As the frequency of the signal is varied, the percent
duty cycle of this signal changes. The duty cycle is monitored to determine whether the frequency is
high or low. This information is displayed on the board’s LEDs and passed on to the Logic Module for
further processing.
2.8.7 SOE/IRIG-B MODULE AND SOE/IRIG-B I/O MODULE
The IRIG-B Module is a status monitor card for the RFL 9780 which monitors system status every 1
ms. Sequence Of Events are recorded when any point changes state or if the CPU gets reset. The
Sequence Of Events log is a record of the state of each point, the state of CPU reset, and the date and
time the record was saved. The system can record up to 40 events. The module has a free running clock
which is synchronized every ten seconds to the IRIG-B clock if IRIG-B is available. The SOE data is
retrieved via a 3-wire RS-232 port.
2.8.8 I/O MODULES
The I/O modules serve as an interface for input and output signals between the RFL 9780 and the line
coupling equipment. There are several types of I/O modules that can be used with the RFL 9780. These
are shown and described in Section 17.
2.8.9 HYBRID MODULES
Hybrids are optional interface modules for RFL 9780 terminals, used to connect transmitter outputs and
receiver inputs to line tuning units. Two basic types of hybrids are available: the RFL 9780 X- Hybrid
and the RFL 9780 Skewed Hybrid. By installing these hybrids in the RFL 9780 chassis and making all
interconnections as part of the chassis wiring, all external interface wiring is eliminated, except for a
single coaxial cable to the line tuning unit. A coaxial connector at the rear of the chassis is provided for
this purpose. Section 18 of this manual contains additional information on the RFL 9780 hybrids.
2.8.10 POWER SUPPLY MODULES
The RFL 9780 power supply accepts the incoming station battery voltage and produces four regulated
dc output voltages: +15 Vdc for the analog circuits, +5 Vdc for the logic circuits, and +12 Vdc for
powering the relays. Two different versions of the power supply are available: one for 38 to 150 Vdc
input, and one for 200 to 300 Vdc input. Additional information on these power supplies can be found
in Section 19 of this manual.
To Next Page
Loading...