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Summary of Contents for LDG OT-11P
- Page 1 OT-11P Automatic Antenna Tuner For Ten-Tec Orion Manual Version 1.1 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 2006. All rights reserved.
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Page 2: Table Of Contents
OT-11P Automatic Antenna Tuner For the Ten-Tec Orion Introduction Specifications OT-11P Auto Tuner Overview Installation Operation Theory Of Operation Some Basic Ideas About Impedance Transmitters, Transmission Lines, Antennas and Impedance The LDG OT-11P A Word About Tuning Etiquette Care and Maintenance... -
Page 3: Introduction
LDG pioneered the automatic, wide-range switched-L tuner in 1995. From its laboratories near the nation’s capitol, LDG continues to define the state of the art in this field with innovative automatic tuners and related products for every amateur need. -
Page 4: Ot-11P Auto Tuner Overview
OT-11P Auto Tuner Overview Your OT-11P comes fully assembled, aligned and ready to install. You will install the tuner inside your Orion transceiver, resulting in a fully integrated internal tuner. After installation, your OT-11P tuner will be controlled by the Orion's front panel TUNE button. - Page 5 Your OT-11P is custom designed specifically for the Orion transceiver and its power levels. LDG does not recommend using the OT-11P in any other application. If you choose to do so, never exceed 125 watts peak power input to the tuner. A minimum of 0.1 watts is required to activate the tuner.
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Page 6: Installation
Step 1: Carefully place the OT-11P into position in the right rear compartment of the radio. Be careful not to pinch or foul any of the wires connected to the tuner. The OT-11P goes in with the components up (looking down into the bottom of the radio) with the red toroid inductors to the left. - Page 7 Original Orion Orion II Step 2.5: Route the black and white control cable from the OT-11P tuner through the round grommet in the back of the front-panel compartment. It's a snug fit through the grommet, but you can gently work it through.
- Page 8 Step 2.8: Take a short coffee break; the worst is over. Step 3: Route the red wire connected to the OT-11P through the notch in the radio's center-right shield panel, to the front right compartment of the radio. Locate the small circuit board there, and the black multi-pin connector on the left side.
- Page 9 ANT 1 SO-239 antenna jack. There is a jumper connecting these two jacks. Carefully remove the jumper and discard it (or, you can save it in case you want to uninstall your OT-11P tuner, but why would you ever want to do that?).
- Page 10 Step 6: Carefully insert the cable coming from the front of the OT-11P into the jack furtherest from the right edge of the PC board. This is the cable that is connected to the OT-11P through the small toroid sensor coil labeled T1 on the tuner. Insert the other cable into the jack nearest the edge of the PC board.
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Page 11: Operation
The word "tuned" will appear on the display, and the achieved SWR (usually less than 1.5) will be momentarily displayed. As you use your OT-11P it will automatically memorize tuning parameters for up to 200 of your favorite frequencies and bands. When you re-tune on or near that frequency again, your OT-11P will restore these parameters almost instantly, much faster than a full tuning cycle. -
Page 12: Theory Of Operation
, but a little background will help you understand what your OT-11P 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 13 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 OT-11P automates this process.
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Page 14: The Ldg Ot-11P
The capacitors are connected to ground with the inductor relays. Another relay switches the entire capacitor bank to the input or output side of the inductor. This switching allows the OT-11P to automatically handle loads that are greater than 50 ohms (high setting) and less than 50 (low setting). -
Page 15: A Word About Tuning Etiquette
If you need to return your OT-11P 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 (www.ldgelectronics.com), fill it out and return it with your tuner. -
Page 16: Firmware Upgrades
If you have an idea to improve our software or hardware, please send us a description. If we incorporate your idea in the OT-11P, we'll send you a free upgrade as a “thank you”. We encourage everyone who uses the OT-11P to contact us (card, letter or e-mail preferred) telling us how well it works for you.