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JT-11

Automatic Antenna Tuner

For the Ten-Tec Jupiter

Introduction

3

Specifications

3

JT-11 Auto Tuner Overview

4

Installation

6

Operation

10

Theory Of Operation

11

Some Basic Ideas About Impedance

11

Transmitters, Transmission Lines, Antennas and Impedance

11

The LDG JT-11

12

A Word About Tuning Etiquette

14

Care and Maintenance

14

Technical Support

14

Warranty and Service

14

Firmware Upgrades

15

Feedback

15

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Содержание JT-11

Страница 1: ...n 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 ...

Страница 2: ...Overview 4 Installation 6 Operation 10 Theory Of Operation 11 Some Basic Ideas About Impedance 11 Transmitters Transmission Lines Antennas and Impedance 11 The LDG JT 11 12 A Word About Tuning Etiquette 14 Care and Maintenance 14 Technical Support 14 Warranty and Service 14 Firmware Upgrades 15 Feedback 15 ...

Страница 3: ...eous frequency or band changing Automatic reset of last tuned setting on power up Tuning time 0 1 to 4 seconds full tune 0 1 second memory tune Frequency coverage 1 8 to 30 0 MHz Tunes 6 to 1000 ohm loads 32 to 4000 ohms with optional external 4 1 Balun LDG RBA 4 1 For Dipoles Verticals Vs Beams or and Coax Fed Antenna Optional external Balun allows tuning of random length long wire or ladder line...

Страница 4: ...ting coaxial connections and make three new solder connections These are simple steps well within the abilities of anyone with basic electronic assembly skills Simply follow the step by step directions referring to the accompanying illustrations Work patiently read through each step completely before proceeding and check your work often Your workplace should be uncluttered well lighted and well ve...

Страница 5: ...hole Simply hold the wire against the pad heat with your soldering iron and apply a small amount of solder Hold the wire in place until the solder cools It will help to tin the wire first flowing solder onto the wire before soldering it into place In installing your JT 11 you will unsolder two coaxial cable connections on your Jupiter you must remove the excess solder from these connections You ha...

Страница 6: ...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 Step 1 Locate the connection header on the left side of the DSP LOGIC board viewed from the front Locate the two empty pins on this header they are nearest the front of the radio Route the black white wire pair through the notch in the back e...

Страница 7: ...just to the left of the RF deck Locate the top center solder pad that already has one red wire soldered to it Carefully tack solder the red wire from the JT 11 to this same solder pad When you re done there should be two red wires soldered to this pad Step 5 Locate the FILTER board It is the vertically mounted board behind the DSP LOGIC board between it and the RF deck You will loosen but not remo...

Страница 8: ...om the JT 11 to the FILTER board The RF IN coaxial cable is the one connected to the front of the JT 11 that is the side nearest the front of the radio through a small toroid inductor Connect the other end of this coaxial cable to the FILTER board exactly where you removed the cable in Step 7 The center conductor goes through the toroid Again take care not to damage the toroid on the FILTER board ...

Страница 9: ...cover Congratulations You have completed installation of your JT 11 automatic tuner Proceed to Operation Upgrading other Internal Tuners 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 wit...

Страница 10: ...y again your JT 11 will restore these parameters almost instantly much faster than a full tuning cycle Your JT 11 literally learns as you use it You can if you wish force the tuner to run a full tuning cycle even when there are tuner parameters stored for that operating frequency Press the Tune button to start a tune cycle then press it again to abort the cycle Press Tune a third time to clear the...

Страница 11: ...hibit resistance and impedance in the form of capacitive or inductive reactance Transmitters Transmission Lines Antennas and Impedance The output circuit of your transmitter the transmission line and the antenna all have a characteristic impedance For reasons too complicated to go into here the standard impedance is about 50 ohms resistive with zero capacitive and inductive components When all thr...

Страница 12: ...sipated in the tuner as heat never reaching the antenna at all A tuner simply fools your transmitter into behaving as though the antenna were resonant avoiding any damage that might otherwise be caused by high reflected power Your antenna should always be as close to resonance as practical where F Forward power watts R Reflected power watts SWR Lookup Table Find SWR at intersection of forward powe...

Страница 13: ...ate the FORWARD and REVERSE power levels Once adjusted the forward and reverse power sensors produce a calibrated DC voltage proportional to the forward and reverse RF power levels These two voltages are read by the ADCs in the microprocessor Once in a digital format they are used to calculate SWR in real time The relays operate from DC supplied by the power input jack The total current drawn by t...

Страница 14: ...hone technical support is available at 410 586 2177 weekdays from 9 am to 5pm Eastern Time Inquiries by Fax at 410 586 8475 are welcome and prompt e mail support is available at ldg ldgelectronics com Warranty and Service Your JT 11 is warranted against defects in parts or workmanship for two years from purchase The warranty does not cover damage due to abuse or exceeding specifications This warra...

Страница 15: ...ill be announced on our web site when available Feedback If you have an idea to improve our software or hardware please send us a description If we incorporate your idea in the JT 11 we ll send you a free upgrade as a thank you We encourage everyone who uses the JT 11 to contact us card letter or e mail preferred telling us how well it works for you We are also always looking for photographs of ou...

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