Armstrong G1000 Dual Redundant Weather Radio Transmitter System
When the Armstrong design team began its work on a
new transmitter for the
National Weather Service's NOAA Weather Radio Network we were clearly
focused on its Life Saving Mission.
We understood the need: Build a transmitter with exceptional reliability
which was user friendly, easy to maintain and incorporated necessary
innovations to provide NOAA with the best possible signal audio on a
Finally it had to be done within budget to give NOAA and its Cooperators a
cost effective solution without losing sight of the primary objective:
"To Save Lives".
Armstrong's Team of designers created the most robust RF platform possible to ensure the uninterrupted "On Air" presents of the Life Saving
NOAA audio signal.
We adopted a modular sub assembly approach that allows all sub assemblies to
be used in all three-power levels of transmitter systems. This approach minimizes field maintenance, parts and life-cycle costs. Modules are easily
accessible, parts are readily available and replacement is fast and simple.
To ensure uninterrupted service a microprocessor-based system controller
monitors all system parameters and automatically switches to the stand by transmitter should conditions warrant. Additionally all system parameters
can be monitored and controlled remotely using a computer with a modem.
Our remote diagnostic software allows the technicians to query the
transmitter system, not only to check the "ON AIR" transmitter's
operational status but to also check the secondary transmitter, without
interrupting the "ON AIR" signal. This keeps NOAA's message on the
Our team then looked at the real world RF environment. We needed to take every step possible to ensure the transmitter would not cause interference
with other RF equipment and that other equipment did not interfere with NOAA
life saving audio programming reaching the public.
We incorporated a dual band pass cavity filter with a 1/4 wave stub into our
design. This not only serves as additional lightning protection for the transmitter, but it is the final key in providing a filtering system which
exponentially decreases the chance of interference even in high RF environments.
We also added a Digital audio processor to provide NOAA with the clearest and cleanest audio signal, on the air, as was technically possible. The
increase in transmission clarity can make a "life saving" difference in reception
quality, dramatically improving a community's preparedness.
PDF Links to Antenna Literature
(to download the files, right click on the
link and choose 'Save Target As...', otherwise, left click to open)
NOTE: Due to the total size of the NOAA
Literature PDF file it is being provided in two sections.