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..
2 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 ...
3 introduction congratulations on selecting the jt-11 tuner for your ten-tec jupiter transceiver. This tuner, when installed, will be fully integrated with your transceiver, and will be controlled by the radio's user interface. Your jt-11 will quickly and automatically match an amazing variety of an...
4 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 int...
5 a word about power levels your jt-11 is custom designed specifically for the jupiter transceiver and its power levels. When used with the jupiter, the rf power will automatically be lowered to approximately 20 watts during the tuning cycle. Ldg does not recommend using the jt-11 in any other appli...
6 installation before installing your jt-11 tuner, you should upgrade the radio's firmware to the latest version. Consult the radio's manual and the ten-tec web site for instructions on how to do this. When the firmware upgrade is complete, proceed with installing the tuner. With your jupiter powere...
7 the tuner shield is a fairly tight fit, so you may have to gently flex the sides of the jupiter chassis to slide the tuner in. Align the four mounting holes in the tuner shield with the four holes in the jupiter chassis. Secure with the four small cross-point screws provided. Hand tighten only; do...
8 step 7: unsolder and remove the coaxial cable connecting the filter board to the so-239 connector on the back panel of the radio. Carefully melt the solder, then remove it using either solder wick or a solder sucker. Repeat until all excess solder is removed and the cable can be removed from the b...
9 step 10: reattach the filter board to the chassis using the screws you removed in step 6. Do not overtighten. Step 11: carefully check your work. Look especially for solder splashes or bridges. Make sure all wires are routed neatly, and that none will be pinched or fouled when you replace the case...
10 operation enabling the tuner: in the jupiter setup menu, check the autotuner setting. If it is presently set to off, change it to 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 tun...
11 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. It is beyond the scope of this manual to present a tutorial on...
12 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...
13 the ldg jt-11 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...
14 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 butto...
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 b...
