Specific Area Message Decoder
A programmable digital decoder, such as the
WX-200, equipped with SAME is designed to respond to SAME alerts with
an audible tone or other warning. The WX-200 can be programmed to respond
to specific types of warning and/or those occurring in certain cities,
counties, or other geographical areas.
Alert Message Timer
At the conclusion of a SAME alert a digital
termination signal is transmitted. The WX-200 is designed to
decode and automatically shut down the transmitter or, if desired,
an internal message timer can control the transmission time.
The WX-200 is engineered to seamlessly interface
with your repeater. With as few as 4 simple connections, the
WX-200 can be set up to provide automatic weather alerts.
During a weather alert, a relay in the WX-200 will disconnect the transmitter
from the controller and connect it to the weather receiver. The relay
grounds the transmitter PTT line while providing weather audio to modulate
Alert Start Logic Output
The SAME broadcast includes a signal that
is decoded by the WX-200 to produce an external alarm, trigger the
controller to execute a specialized macro or automatically load a pre-recorded
Alert Stop Logic Output
The WX-200 is also able to respond to a length-of-message
signal embedded in the SAME alert. Responding to this signal, the WX-200
will automatically reload a NORMAL memory save.
Weather Enable/Disable Input
Receiver alert control signals are available
through the rear panel 15 pin connector. The enable input (when grounded)
will enable the receiver. By connecting this input to a controller's
user function output switch, weather reports on demand are available.
The disable input (when grounded) will inhibit all WX-200 weather alerts,
a feature to prevent repeater transmissions from interruption.
Voice Synthesizer Alert Message
Embedded in the SAME message is the time
period the warning is in effect. During this time period the
built-in voice synthesizer will periodically broadcast the nature of
the alert. The voice synthesizer is programmed with several warnings,
including "Tornado Warning", Winter Storm Warning", "Flash Flood Warning
among many other .
WX-200 Printed Circuit Board Assembly
The PC contains a state of the art surface
mount, dual conversion receiver equipped with a low-noise GaAS MESFET
RF amplifier and a single chip MC13135P Motorola receiver. The dip
switch allows the built-in frequency synthesizer to select one of 7
NOAA broadcasting stations. The WX-200 interfaces with the repeater
through the DB-15 rear connector while the DB-9 connector allows the
RS-232 port connection to interface with a PC serial port. The heart
of the WX-200 is the decoder-logic section which consists of the FSK
decoder, P80C51RD2 microprocessor, NRAM, and TI voice synthesizer.
Since the weather receiver data base is stored in the NRAM, the WX-200
can always be up-dated.