MFJ 998RT Legal Limit IntelliTuner™ Remote Automatic Antenna Tuners MFJ-998RT

MFJ 998RT legal limit IntelliTuner™ remote automatic antenna tuners are comprehensive, full legal limit antenna tuning units. MFJ 998RT tuners let you rapidly tune almost any unbalanced or single-wire antenna automatically. Balanced feedlines may be used with a 1.5 kW 4:1 balun connected to the antenna output. MFJ's exclusive InstantRecall™, IntelliTune™, and AdaptiveSearch™ algorithms give you fast, automatic tuning with more than 20,000 non-volatile VirtualAntenna™ memories. Each of the two antenna banks has four banks of memory, and each memory bank has over 2,500 non-volatile memories for tuner settings. The banks allow you to save settings for several antennas, giving you the flexibility to move the tuners between antennas or move them to different locations without losing the old settings. These tuners include a highly efficient switched-L network with wide matching capabilities, 1.8 to 30 MHz coverage, a backlit LCD display, and heavy-duty 16 amp/1,000 V relays. They're rated at 1,500 watts SSB/CW and will match impedance from 12 to 1,600 ohms (SWR up to 32:1). A maximum of 256 values of inductance and 256 values of input capacitance, or 64 values of output capacitance, is available. This provides a total of 81,920 L/C tuning combinations. The nominal tuning ranges are 0 to 24 microhenry and 0 to 3,900 pF, and once a match is found, the matching network values can be displayed, so you may design your own fixed matching network if desired. The MFJ 998RT IntelliTuners™ learn and remember. When you transmit, they automatically adjust for minimum SWR and remember the frequency and tuner settings, which are safely stored in non-volatile memory. The next time you operate on that frequency (or close to it) and antenna, these tuner settings are instantly restored and you're ready to operate in milliseconds. When you key your transmitter, MFJ's InstantRecall™ checks its memory to see if you have operated on that frequency before. If so, tuning is instantaneous and you're ready to operate. If not, MFJ's IntelliTune™ algorithm (based on MFJ's famous SWR Analyzer technology) kicks in. First, it measures the complex impedance of your antenna. Next, it calculates the components needed and instantly snaps them in. Finally, it fine-tunes to minimize SWR, and you're ready to operate, all in a fraction of a second. If the antenna impedance is not within the tuners' measurement range, MFJ's AdaptiveSearch™ algorithm goes into action. Frequency is measured and relevant components' values are determined. Only those values are searched for fast tuning. If the tuner still cannot find a match, the search is performed again using a different search pattern. Target SWR can be set at 1.0 through 2.0 and the minimum power to tune is approximately five watts. MFJ 998RT tuners enter a "sleep" mode when idle and, when no transmit signal is present, they turn off the microprocessor clock to avoid the generation of spurious signals.

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