mAT-30 HF-SSB Automatic Antenna Tuner 120W Auto Tuner Automatic Ham Radio for Yaesu. The mAT-30 is an automatic tuner intended for use with modern for Yaesu transceivers.It works with some for Yaesu transceiver that supports an FC-30,FC-40 or FC-50 for Yaesu tuner;a partial list of compatible units includes:FT-100,FT-857,FT-897,FT-450D,FT-891.The interface cable is included.The operating is the same as the method of for the Yaesu tuner, which is simple and convenient. The mAT-30 can work within the range of 3MHz to 54MHz. The mAT-30 connects to the radio via its CAT/LINEAR jack to control the tuning cycle;the transceivers Tune button controls the tuner.The CAT/LINEAR jack also powers the tuner,so it requires no external power supply.The mAT-30 is specially engineered to integrate with for your Yaesu FT-100/857/897/450D/891 HF radio.Tuning is performed when the TUNE button is pushed on the front of the transceiver and held for one second. The mAT-30 provides automatic antenna tuning across the entire HF spectrum plus 6 meters,at power levels up to 120 watts.It will tune dipoles,verticals,Yagis,or virtually any coax-fed antenna.It will match an amazing range of antennas and impedance,far greater than some other tuners you may have considered,including the built-in tuners on many radios. The mAT-30 is specially engineered to integrate with for your Yaesu FT-100/857/897/450D/891 HF radio.The mAT-30 connects to the CAT(Computer Automated Transceiver) port on the back of the radio. The CAT interface allows an external device such as a PC or the mAT-30 to control the FT-100/857/897/450D/891 by sending it serial commands.The mAT-30 takes advantage of this interface to simplify the tuning process --one button push is all that is needed in order to switch the radio to FM mode,reduce output power, transmit a carrier, measure the transmit frequency,