|Amateur Antenna Tuners|
The MFJ-926B HF Automatic Remote Antenna Tuner, the IntelliTuner, lets you rapidly tune any antenna automatically: unbalanced or single-wire. MFJ's exclusive InstantRecallTM, IntelliTuneTM and AdaptiveSearchTM algorithms give you fast automatic tuning with more than 2500 non-volatile VirtualAntennaTM memories. The tuner includes a highly efficient switching L-network with wide matching capability, 1.8 to 30 MHz coverage, a radio interface port, and heavy-duty 10 amp/1000 volt relays. It is rated at 200 watts SSB/CW.
A maximum of 256 values of inductance and 256 values of capacitance are available. With the capacitance switched between the input and output side, this provides a total of 131,072 L/C tuning combinations. The nominal tuning ranges are 0 to 24 ìH and 0 to 3900 pF. The MFJ-926B IntelliTuner learns and remembers. When you transmit, it automatically adjusts for minimum SWR and remembers the frequency and tuner settings, safely stored in non-volatile memory. The next time you operate on that frequency (or close to it), the MFJ-926B 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. It measures the complex impedance of your antenna. Next, it calculates the components it needs 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 tuner’s 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 it still cannot find a match, the search is performed again using a different search pattern. The tuners enter a “sleep” mode when idle and when no transmit signal is present, turning off the microprocessor clock to avoid the generation of spurious signals.
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