User manual THULE 573

[. . . ] It will match an amazing range of antennas and impedances, far greater than some other tuners you may have considered. Also, it consumes very little power making it suitable for battery-powered operations. While resembling earlier LDG tuners in overall layout and function, the AT-100Pro represents a quantum leap in features and performance. Enhanced tuning algorithms provide much faster, precise and consistent tuning. [. . . ] On the next power up, the tuner will reset the last tuned settings. You can if you wish press Func-Tune to save the bypass setting, erasing the memory for that frequency. Power and SWR Indication During a tuning cycle the Power and SWR LED meter indicate forward power and the present SWR, respectively. If you are using a transmitter or transceiver with SWR rollback protection, you will see the forward power vary up and down quite a bit during a tuning cycle. During transmit, both forward power and SWR are displayed if this option is selected in the startup options. When no LEDs are lit on the SWR meter when RF is present, it means that the SWR is less than 1. 1. When the LED segment labeled 1. 1 is lit, it means that the SWR is between 1. 1 and 1. 3. The 1. 3 LED indicates an SWR between 1. 3 and 1. 5, and so on. Read each LED segment to mean "equal to or greater than the marked SWR, but less than the next higher marked SWR". 13 Off Mode When any tuning cycle ends, the tuner automatically enters a "deep sleep" state in which it draws just a few milliamps; it is effectively off. The tuner will automatically "wake up" the next time you start a tuning cycle, when RF is present, a button is pressed or when an automatic tuning cycle is required, if this option is selected. The latching relays will hold the tuned configuration indefinitely, even when you unplug the power cable or turn off the transceiver powering the tuner. The AT-100Pro does not include an internal fuse; you must provide one in the DC line. LDG recommends a 2 Amp "fast blow" fuse. Make sure the tuner is well grounded to the car body. To install the unit under the dash, you can "homebrew" a bracket. You can also use Velcro tape, although the adhesive tends to soften in hot weather. In the trunk, Velcro works well to secure the unit to the trunk floor. Simply run coax from your transceiver to the tuner, run a fused DC line to the tuner and connect your mobile antenna. Simply set the tuner to Automatic mode, and you're ready to go; the tuner will adjust the match as needed whenever you transmit on a new band or frequency. You can observe the progress of the match on your rig's SWR meter, or on the power output meter (not while driving; keep your eyes on the road!). When the reading stops changing, the tuner has finished tuning. Most of the time this will happen very quickly, as the AT-100Pro tunes from memory in less than a second. Xcvr Tuner 2A DC When to use Auto mode Auto mode is most useful when you are often changing frequencies and bands (a contest, for instance). [. . . ] However, do your best to avoid interfering with other hams as you tune. Your AT-100Pro's very short tuning cycle, as little as a fraction of a second, minimizes the impact of your tuning transmissions. Care and Maintenance Your AT-100Pro tuner is essentially maintenance-free; just be sure to observe the power limits discussed in this manual. The outer case may be cleaned as needed with a soft cloth slightly dampened in household cleaning solution. [. . . ]