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Maxon America’s SD-670D Series of Tier 2 DMR + Analog Radio Frequency Data Modems are rugged, reliable, and designed for a variety of VHF or UHF band radio applications like SCADA, Call Boxes, Weather stations, Water pumps, and Remote Controls (sirens, switches, sign control).
SD-670 RF Modems incorporate Maxon’s popular small mechanical footprint, a BNC antenna connection, and DE-15pin serial connection for RS-232C communication. Its die-cast aluminum housing shields the radio from RF interference and gives exceptional durability in the most extreme environments. Transmit power settings between 2 Watts, 5 Watts, and 10 Watts* (*VHF only) provide the power needed for any job and the LED indicator gives an instant, on-sight status of the radio’s operation. Built-in AT Commands can be used to operate the modem and adjust settings. SD-670 series modems can be used for voice transmission as well as data on up to 32 channels using dip-switch settings. Digital mode for the SD-670 uses an AMBE3000 vocoder chip with AMBE+2 voice compression algorithm to provide excellent audio quality and to allow for high-speed data transmission through its integrated modem. Over the air data speed is 9600bps baud. SD-670’s versatility to work in both Analog and Digital modes, its durability, low current drain, high data speed, and fast transmitter/receiver attack times for operation, make this the ideal radio for the harshest of system demands.
http://maxonamerica.com/product/maxon-sd-670d-series-data-radios/

I’m not a technologist, but I know that it’s misleading when wireless carriers try to convince first responders that their network is always on. Does that mean it’s always available? No. After all, the sun is always on, but it’s not sunny every day. Always on is the price of admission to the modern world. Does your electric company brag that your electricity is always on? No, because it should be.
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