Meet the Z-11Pro, everything you always wanted in a small, portable tuner designed from the ground up for battery operation. Only 5" x 7.7" x 1.5", and weighing 1.5 pounds, it handles 0.1 to 125 watts, making it ideal for both QRP and standard 100 watt transceivers from 160 - 6 meters. The Z-11Pro uses LDGs state-of-the-art processor-controlled Switched-L tuning network. It will match dipoles, verticals, inverted-Vs or virtually any coax-fed antenna. With an optional LDG balun, it will also match longwires or antennas fed with ladder-line. The Z-11Pro has 8,000 memories in LDG's exclusive "3-D Memory" array, automatically storing tuning configurations for each frequency and band as you use them, for each of four antennas on the single RF port. Frequency sensing circuitry lets the Z-11Pro “know” your operating band and frequency. Whenever you transmit on or near a frequency you've used before, the Z-11Pro retunes from memory almost instantly (even in SSB!). Memories are retained indefinitely. Rugged and easy-to-read LEDs indicate SWR and status. The Z-11Pro uses latching relays which retain the tuned configuration even when powered down; current draw when not tuning is effectively zero. For maximum flexability, the user has the choice of many battery options; internal or external. There are solder pads on the PC board for the user to install a battery pack (not included) that best suits their needs. You could use 6 AAs and get several years of operation. If weight is a factor (for back packing), then three Lithium AAs will last about a year. If you just need a few months, the Z-11Pro will operate fine off a single 9V battery. Control from the front panel is simple and straightforward; just press Tune while transmitting, and the Z-11Pro will begin a tuning cycle. The Z-11Pro will even tune while you talk on AM or SSB. Although not required, optional interfaces are available for most Icom, Kenwood, Yaesu and Alinco transceivers. With the interface, a single button-press transmits a carrier, executes a tuning cycle and returns the radio to its original power and mode. Specifications: 0.1 to 125 watt power range (SSB and CW), 100W on 6M. Easy to read LED display for SWR and status. 8000 3-D memories for instantaneous band changing. Tuning time: 0.1 to 6 seconds full tune, 0.1 seconds memory tune. Selectable user parameters: Auto/Semi, threshold, and more. 1.8 to 54.0 MHz coverage. Built-in frequency sensor. Tunes 6 to 1000 ohm loads (16 to 150 on 6M), 6 to 4000 ohms with optional 4:1 Balun. For Dipoles, Verticals, Vs, Beams or and Coax Fed Antenna. Optional external Balun allows tuning of random length, long wire or ladder line fed antennas. Optional interfaces for Icom, Alinco, Kenwood and Yaesu available. Power requirements: 8 to 16 volts DC at 300 mA Max. 25 uA standby current. User installable battery holder (not supplied). Small Size Enclosure: 7.7” x 5.0” x 1.5”. Weight: 1.5 pounds.