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Summary of Contents for LDG AT-100AMP
- Page 1 AT-100AMP Automatic Input Tuner Manual Version 1.0 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 Copyright © LDG Electronics 2005. All rights reserved.
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Page 2: Table Of Contents
AT-100AMP Automatic Input Tuner Introduction Specifications AT-100AMP Auto Tuner Overview Application Notes Operation Theory Of Operation Some Basic Ideas About Impedance Transmitters, Transmission Lines, Antennas and Impedance The LDG AT-100AMP A Word About Tuning Etiquette Care and Maintenance Technical Support... -
Page 3: Introduction
Congratulations on selecting the AT-100AMP tuner. This is a new category of product for LDG; where most LDG tuners are stand-alone products, or in a few cases boards to be installed in specific radios, this tuner is intended to be installed in a homebrew amplifier. For that reason, the instructions in this manual are necessarily general, leaving the details of installation to you as you build your amp. -
Page 4: At-100Amp Auto Tuner Overview
12 vdc, RF in and RF out. As you operate, the AT-100AMP automatically tunes the input of your amp in seconds so the exciter is always optimally matched to the amp. The AT-100AMP's 4,000 memories automatically store tuning parameters for your favorite bands and frequencies for nearly instant recall when you transmit on or near the same frequency again. -
Page 5: Application Notes
DC power input is 11 - 16 vdc at 500ma maximum from any suitable source. Application Notes Since the AT-100AMP is intended to be installed in your homebrew amp, installation details are up to you. Here are a few guidelines to help make things go smoothly: Mount the tuner in a shielded compartment if possible. - Page 6 The input/output interface is a set of PC holes on the back of the tuner board. The holes look like this: The TUNE button connects between the single hole at the top of this picture (ground) and the left-most hole in the row of four. The tune indication appears between the right-most hole and ground.
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Page 7: Operation
Operation Your AT-100AMP is fully automatic. It "wakes up" in automatic mode whenever DC power is applied, and will automatically start a tuning cycle whenever RF is present and the SWR exceeds 1.7. In practice, you will simply operate normally, transmitting, tuning the amp, etc. Your AT- 100AMP will automatically adjust the match between your exciter and amp as needed. -
Page 8: Theory Of Operation
, but a little background will help you understand what your AT-100AMP is doing, and how it does it. In simple DC circuits, the wire resists the current flow, converting some of it into heat. The relationship between voltage, current and resistance is described by the elegant and well-known “Ohm’s Law”, named for Georg Simon Ohm of Germany, who first discovered it in 1826. - Page 9 Simple tuners use variable capacitors and inductors; the operator adjusts them by hand while observing reflected power on the SWR meter until a minimum SWR is reached. Your LDG AT-100AMP automates this process.
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Page 10: The Ldg At-100Amp
The LDG AT-100AMP 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 and inductor banks, seeking the lowest possible SWR. -
Page 11: A Word About Tuning Etiquette
A return form is provided on our web site for your convenience. If you need to return your AT-100AMP to us for service, package it carefully, keeping in mind that we will re-use your packaging to return the unit to you. Download the return form from our web site (ldg@ldgelectronics.com), fill it out and return it with your tuner. -
Page 12: Feedback
If you have an idea to improve our software or hardware, please send us a description. If we incorporate your idea in the AT-100AMP, we'll send you a free upgrade as a “thank you”. We encourage everyone who uses the AT-100AMP to contact us (card, letter or e-mail preferred) telling us how well it works for you.
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