At-1000 automatic antenna tuner manual version 1.0g 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.
1 ldg at-1000 1kw automatic antenna tuner table of contents introduction 1 important safety warnings 1 jumpstart, or “real hams don’t read manuals!” 2 features 2 specifications 2 operating instructions 3 getting to know your at-1000 3 installation 4 basic operating instructions 5 advanced operating ...
2 jumpstart, or “real hams don’t read manuals!” ok, but at least read this one section before you transmit: safety warning: never operate your at-1000 with the cover removed; lethal rf voltages may be present during operation. Never exceed specifications. 1. Connect your at-1000 to a source of 11 – ...
3 operating instructions getting to know your at-1000 your at-1000 is a quality, precision instrument that will give you many years of outstanding service; take a few minutes to get to know it. On the front panel, there are six pushbutton switches: • power: turns your at-1000 on and off • manual cap...
4 on the back panel, there are four connectors: • dc power input (2.5 x 5.5 mm coaxial power connector, center pin positive) • rf in (standard so-239 socket) • rf out (standard so-239 socket) • ground (wingnut) “what’s the deal with the hole?” sharp -eyed users will note an empty cutout labeled “con...
5 provided 2.5 x 5.5 mm coaxial power plug. Be sure to observe proper polarity; the center pin, and the red lead are positive. Basic operating instructions press the “power” button on the front panel. The red led above the button, and the meter lights come on indicating that your at-1000 has powered...
6 taps of the dn button. Once you’ve gone through this process a few times, you will get a better feel for matching certain antennas or frequencies. Advanced controls pressing the “cap dn” and “ind dn” buttons together places the tuner in bypass mode. Rf from your amp lifier goes directly to the ant...
7 troubleshooting and faq: my tuner will not tune on one band your coax length may be an odd ¼ wavelength of the frequency that you are trying to tune. Lengthen your coax 3 to 6 feet (1 to 2 meters). My tuner will not tune on many bands and the meters exhibit erratic behavior you may have rf getting...
8 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 1 . It is beyond the scope of this manual to present a tutorial ...
9 f r f r swr / 1 / 1 − + = swr is measured using a device called an “swr bridge”, inserted in the transmission line between the amplifier and antenna. This circuit measures forward and reverse power from which swr may be calculated (some meters calculate swr for you). More advanced units can measur...
10 the ldg at-1000 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...
11 the relays operate from an external 12 volt dc power supply. The total current drawn by the at-1000 depends primarily on the number of energized relays, with the maximum current drain being approximately 1 amp. Although the microprocessor’s oscillator runs at 8 mhz, its internal bus speed is on o...
12 care and maintenance your at-1000 tuner is essentially maintenance-free; just be sure to observe the power limits discussed in this manual. The outer case may be cleaned as needed with a soft cloth slightly dampened in household cleaning solution. As with any modern electronic device, your at-100...
13 the extraction tool fits into opposite corners of the 68hc11 socket; the bent ends will lift the chip from beneath. Unplug the tuner, touch a ground point to avoid static discharge damage, and remove the cabinet cover. Insert the tool and pull gently and evenly on both sides to extract the chip. ...
