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Two-Way Radio
Dev-2420 was designed by telemax technology inc. To provide a conventional two-way vhf / UHF radio with an inexpensive digital encrypted voice communication capability. With this device,Customers not only upgrade their voice communication quality from analog to digital, but have the added advantage of encrypting voice through advanced digital encryption computation.Dev-2420 carries out its voice compression via multi-band excitation (mbe) coding, which provides high compression with very good voice quality. Field tests show that with this device, aUser can clearly differentiate the distinct traits that distinguish individual voices. The mos (mean opinion score) of the voice quality of dev2420 is about 3. 0, when the voice is compressed down to 2000 bps.Dev-2420s encryption is achieved via a highly complex nonlinear serial scheme with a default 128-bit key length (optional 256-bit version can be provided upon request) . At the design stage,Dev-2420 takes into consideration the interference among various radios. To minimize this problem, msk modulation is adopted to achieve high tolerance to interference. The 2400 bpsTransmission speed functions well within 12. 5 khz channel capacity.By digitizing voice, dev-2420 is capable of real time recording. During the communication, it stores the digitized voice in a flash memory IC. Users can retrieve and listen to this content via a special key on the board, and / or store this content to a PC, if desired. Two recording lengths are available, 50 minutes and 3. 5 hours. Designed to work with handheld radios, dev-2420 is also equipped with a rechargeable li-ion battery and power management module to deal with the issue of power source unavailability.Meanwhile, optional modules are available to further enhance dev-2420 as needed for your operations. As position fixed is the most demanded capability for mobile communication, dev-2420 offers an optional GPS module that is small and lightweight, and features high sensitivity, high reliability, and low power consumption. A special mini, all-directional antenna is designed for this module. With this GPS module, every time ptt (push to talk) is pressed, dev-2420 will automatically send out the position information first before turning on the MIC to transmit the voice.The position information is thereby recorded along with the communication.For special applications such as fixed route patrol, dev-2420 also offers a rfid reader module option that is an integral part of the rfid based electronic patrol management system (epms) . With this option, users can read the rfid information placed on the patrol location and send back all patrol information to headquarters for patrol management. This option is exclusive of the GPS option, i. E. They cannot be available at the same time.
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