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Summary of Contents for LDG JT-11
- Page 1 JT-11 Automatic Antenna Tuner For Ten-Tec Jupiter 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
JT-11 Automatic Antenna Tuner For the Ten-Tec Jupiter Introduction Specifications JT-11 Auto Tuner Overview Installation Operation Theory Of Operation Some Basic Ideas About Impedance Transmitters, Transmission Lines, Antennas and Impedance The LDG JT-11 A Word About Tuning Etiquette Care and Maintenance... -
Page 3: Introduction
Your JT-11 will quickly and automatically match an amazing variety of antennas. 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: Jt-11 Auto Tuner Overview
JT-11 Auto Tuner Overview Your JT-11 comes fully assembled, aligned and mounted in its own shield enclosure. You will install the tuner inside your Jupiter transceiver, resulting in a fully integrated internal tuner. After installation, your JT-11 tuner will be controlled by the Jupiter's user interface. - Page 5 LDG does not recommend using the JT-11 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
Turn the radio bottom-up on your workbench with the front panel facing you. The DSP/LOGIC board will be facing up. You will install the JT-11 tuner over this board, connecting it to the radio via the four cables attached to the tuner (one black/white pair (Control), one red wire (+12 vdc), and two coaxial cables (RF IN and RF OUT). - Page 7 Jupiter chassis. Secure with the four small cross-point screws provided. Hand tighten only; do not overtighten. Step 4: Route the red wire from the JT-11 to the vertical board on the inside-back of the radio, just to the left of the RF deck. Locate the top-center solder pad that already has one red wire soldered to it.
- Page 8 Step 9: Route the other coax cable (RF OUT) from the JT-11 to the SO-239 connector on the back of the radio. The RF OUT cable is attached to the back of the JT-11 board to a solder pad labeled "Antenna". Solder the cable to the connector; the coax center conductor goes to the center pin of the connector.
- Page 9 If your radio already has an internal autotuner in it, you may be able to upgrade or replace it. If it is an LDG tuner V3.5, you can simply purchase a new processor to get the upgraded features (see our web site for purchasing information). If you have an LDG tuner with a version number lower than V3.5 (or any other brand tuner), the tuner will need to be replaced.
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Page 10: Operation
ON. You only have to do this once, the first time you use the tuner. Normal operation: Operation of your JT-11 tuner is controlled by the Jupiter's Tune button. To tune, simply set the radio to the desired operating frequency and press the Tune button on the radio's control panel. A tuning cycle will begin;... -
Page 11: Theory Of Operation
, but a little background will help you understand what your JT-11 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 12 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 JT-11 automates this process.
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Page 13: The Ldg
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 JT-11 to automatically handle loads that are greater than 50 ohms (high setting) and less than 50 (low setting). -
Page 14: A Word About Tuning Etiquette
If you need to return your JT-11 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 15: Firmware Upgrades
From time to time LDG may release upgraded firmware for the JT-11, refining operation and adding features. Your JT-11 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 will be announced on our web site when available.
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