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- User Manual
LDG AT-100Pro User Manual
Summary of AT-100Pro
Page 1
At-100pro automatic antenna tuner manual version 1.1 fa ldg electronics 1445 parran road, po box 48 st. Leonard md 20685-2903 usa phone: 410-586-2177 fax: 410-586-8475 ldg@ldgelectronics.Com www.Ldgelectronics.Com.
Page 2: Ldg At-100Pro
Ldg at-100pro automatic antenna tuner table of contents introduction 2 jumpstart, or “real hams don’t read manuals!” 3 specifications 4 an important word about power levels 4 getting to know your at-100pro 5 installation 6 operation 8 basic operation 8 tuning 12 advanced operation 14 application not...
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Introduction congratulations on selecting the ldg at-100pro tuner. The at-100pro provides fully automatic, any mode antenna tuning across the entire hf range plus 6 meters for less than the cost of some manual tuners. It will tune dipoles, verticals, yagis or virtually any coax-fed antenna. It will ...
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Specifications • 1 to 125 watt power range (ssb and cw). • 1.8 to 54.0 mhz coverage. Built-in frequency sensor • for dipoles, verticals, vees, beams or and coax fed antenna • tunes 6 to 1000 ohm loads (16 to150 on 6m), 6 to 4000 ohms with optional 4:1 balun • over 4,000 memories for nearly instant r...
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Getting to know your at-100pro your at-100pro is a quality, precision instrument that will give you many years of outstanding service; take a few minutes to get to know it. • your at-100pro can be used with any transceiver or transmitter with coax output operating in the hf range at no more than 125...
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The at-100pro has over 2,000 memories for each of two antennas, each of which stores the tuning settings for a specific frequency. When you transmit near a previously tuned frequency, you can use “memory tune” to reset the tuner in only a fraction of a second. The process of storing tuning data in m...
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Installation your at-100pro tuner is intended for indoor use only; it is not water resistant. If you use it outdoors (field day, for example) you must protect it from rain. The at-100pro is designed for use with coax-fed antennas. If you wish to use it with longwires or antennas fed with a balanced ...
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Operation basic operation all functions are controlled through the seven front panel buttons. Each function is invoked when the key is released . Some commands are indicated by the length of time you hold a button before releasing it. There are three lengths of press: short (less than .5 seconds), m...
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Menu options your at-100pro offers several options to adapt the tuner to your operations . Many functions are controlled using the func button. Press and release this button to place the tuner in function mode. You will see an "up arrow" display on the led meters, indicating function mode. Function ...
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Peak mode on/off: the led wattmeter will read in average or peak watts. Average mode is most suitable for 100% duty cycle modes like fm or rtty. Peak mode is most suitable for modes in which the amplitude varies, such as ssb or am. The default is average mode. To toggle between these two modes, pres...
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The new setting. Repeat this sequence to cycle through the available values (1.1 - 3.5). The default value is 2.0. The example below shows the threshold set to 1.7. Auto threshold display high/low impedance toggle: you can manually set your at-100pro for hi-z or lo-z antennas. Press and release the ...
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Tuning auto and semi-auto modes in auto mode (see section on selection auto or semi mode) the tuner will begin a tuning cycle whenever the swr exceeds the value you set (see section on setting autotune threshold). In semi mode a tuning cycle begins only when you start one by pressing the tune button...
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Unkey your transmitter or transceiver and reset to your desired power if you changed for tuning − you’re ready to operate. The new tuning parameters are stored for the present operating frequency, replacing any parameters that were previously stored for that frequency. Memory tuning cycle (medium pr...
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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 c...
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Button primary function secondary function (func + button) status check (func hold + button) power-up function tune manual tune (long) auto tune (medium) bypass (short) manually store tuning parameters present relay settings na ant switch between ant 1 and ant 2 connectors on back panel toggle hi-lo...
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Application notes mobile operation the at-100pro is perfectly suited to mobile operation. You can install it under the dash along with your transceiver, or remotely in the trunk. The only requirements are that the tuner remains dry, and that you provide a fused source of dc power in accordance with ...
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When to use peak mode any averaging wattmeter will read correctly only when excited by a steady, unmodulated carrier. Any modulation will cause the reading to vary. Peak mode measures the peak power as the name indicates, and is much steadier in the presence of modulated highs and lows. You will gen...
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Theory of operation some basic ideas about impedance the theory underlying antennas and transmission lines is fairly complex, and in fact employs a mathematical notation called “complex numbers” that have “real” and “imaginary” parts 2 . It is beyond the scope of this manual to present a tutorial on...
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Rises to 2, 3 or higher. As a general rule, modern solid-state transmitters must operate with an swr of 2 or less. Tube exciters are somewhat more tolerant of high swr. If your 50-ohm antenna is resonant at your operating frequency, it will show an swr close to 1. However, this is usually not the ca...
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The ldg at-100pro in 1995 ldg pioneered a new type of automatic antenna tuner. The ldg design uses banks of fixed capacitors and inductors, switched in and out of the circuit by relays under microprocessor control. A built-in swr sensor provides feedback; the microprocessor searches the capacitor an...
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The microprocessor runs a fine tune routine just after the tuner finds a match at an swr of 1.5 or less. This routine tries to get the swr as low as possible (not just 1.5); it takes about a half second to run. There is also a quick tune mode. If the swr is below 2.0 when you press the tune button t...
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Firmware upgrades from time to time ldg may release upgraded firmware for the at-100pro, refining operation and adding features. Your at-100pro is not field programmable; you will have to remove the present chip and replace it with the upgrade chip. Upgrades are expected to cost about $10-$20, and w...