#ANTENNA TUNER IMAGE FULL#

In fact, almost all antenna tuner structures and principles are the same. It can be seen from the figure that the structure is very simple. Schematic Diagramįigure 1 shows the schematic diagram of the antenna tuner circuit, and Figure 2 shows the actual diagram. This is because it is a tuning transformer, which improves the RF selection of the receiving device. In addition to increasing the strength of the signal, the antenna tuning device can reduce the spurious response of the receiver.

Due to different antennas and operating frequencies, the impedance presented by the antennas can vary greatly. The impedance mismatch caused in this way will cause great loss to the signal transmission, and even cause the transceiver to malfunction or be damaged. The remote IntelliTuner™ handles legal limit power CW/SSB.The antenna tuner plays a very important role in short-wave radio communications. 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. Target SWR can be set at 1.0 through 2.0 and the minimum power to tune is approximately five watts. If the tuner still cannot find a match, the search is performed again using a different search pattern. Only those values are searched for fast tuning. Frequency is measured and relevant components' values are determined. If the antenna impedance is not within the tuners' measurement range, MFJ's AdaptiveSearch™ algorithm goes into action. Finally, it fine-tunes to minimize SWR, and you're ready to operate, all in a fraction of a second. Next, it calculates the components needed and instantly snaps them in. First, it measures the complex impedance of your antenna. If not, MFJ's IntelliTune™ algorithm kicks in. If so, tuning is instantaneous and you're ready to operate. When you key your transmitter, MFJ's InstantRecall™ checks its memory to see if you have operated on that frequency before. 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 transmit, they automatically adjust for minimum SWR and remember the frequency and tuner settings, which are safely stored in non-volatile memory. The MFJ 998RT IntelliTuners™ learn and remember.

The nominal tuning ranges are 0 to 24 micro-henry 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. This provides a total of 81,920 L/C tuning combinations. A maximum of 256 values of inductance and 256 values of input capacitance, or 64 values of output capacitance, is available. They're rated at 1,500 watts SSB/CW and will match impedance from 12 to 1,600 ohms (SWR up to 32:1). 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. 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.

MFJ's exclusive InstantRecall™, IntelliTune™, and AdaptiveSearch™ algorithms give you fast, automatic tuning with more than 20,000 non-volatile VirtualAntenna™ memories.Įach of the two antenna banks has four banks of memory, and each memory bank has over 2,500 non-volatile memories for tuner settings. Balanced feedlines may be used with a 1.5 kW 4:1 balun connected to the antenna output. MFJ 998RT tuners let you rapidly tune almost any unbalanced or single-wire antenna automatically. The remote IntelliTuner handles legal limit power CW/SSB.

#ANTENNA TUNER IMAGE FULL#

MFJ 998RT Legal Limit IntelliTuner™ Remote Automatic Antenna Tuners are complete, full legal limit, antenna tuning units. MFJ 998RT Legal Limit IntelliTuner™ Remote Automatic Antenna Tuners

Antenna tuner image