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Related Manuals for LDG AT-1000 Pro
Summary of Contents for LDG AT-1000 Pro
- Page 1 AT-1000 OPERATIONS MANUAL MANUAL REV C LDG AT-1000 Pro 1000-Watt Automatic Memory Antenna Tuner LDG Electronics 1445 Parran Road St. Leonard MD 20685-2903 USA Phone: 410-586-2177 Fax: 410-586-8475 ldg@ldgelectronics.com www.ldgelectronics.com PAGE 1...
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Page 2: Table Of Contents
Table Of Contents Introduction Tuner Safety Warning Important Antenna Safety Warning Jumpstart, or “Real hams don’t read manuals!” Specifications Getting to know your AT-1000 Pro Front Panel Rear Panel Installation Front Panel Button Description Power / Func Button Auto / Thresh Button... -
Page 3: Introduction
INTRODUCTION LDG pioneered the automatic, wide-range switched-L tuner in 1995. From its laboratories in St. Leonard, Maryland, 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: Jumpstart, Or "Real Hams Don't Read Manuals
Connect a 50 ohm coax antenna feedline to the “ANT1” jack on the AT-1000 Pro. Connect the AT-1000 Pro to a source of 11 to 15 volts DC, 1A, using the supplied coaxial DC power plug. Press the “Power” button on the front of the AT-1000 Pro to turn on the tuner. The “Power”... -
Page 5: Specifications
SPECIFICATIONS Continuous frequency coverage 1.8 to 54 MHz (Including MARS, CAP, etc). Transmit Power Rating, 1.8 to 30 MHz: Single Side Band: 1000 watts CW: 750 Watts Digital (RTTY/Packet/PSK31, etc): 400 Watts Transmit Power Rating, 50-54 MHz: 250 watts, all modes. Minimum power required for tuning: 5 Watts Maximum power while tuning: 125W Built-in relay protection will prevent relay operation when:... -
Page 6: Getting To Know Your At-1000 Pro
GETTING TO KNOW YOUR AT-1000 PRO Your AT-1000 Pro is a quality, precision instrument that will give you many years of outstanding service; take a few minutes to get to know it. Front Panel The front panel of the AT-1000 Pro sports eight pushbutton switches and a 3” illuminated cross-needle meter. - Page 7 The Power switch on the AT-1000 Pro toggles between the “Off” and “On” modes. Note that even in “Off” mode, the AT-1000 is not completely “off”, but rather in a very low power sleep mode. In “Off” mode, the AT-1000 relays are completely de-energized, placing the tuner in bypass, selecting the ANT 2 antenna, and no LEDs are illuminated.
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Page 8: Rear Panel
Rear Panel The rear panel of the AT-1000 Pro features six connectors. ANT 1 connector: Connect a 50-ohm coax antenna feedline to this standard SO-239 connector. ANT 2 connector: Connect a second 50-ohm coax antenna feedline to this SO-239 connector, if you have a second antenna system. -
Page 9: Installation
Connect the antenna system to the ANT 1 jack on the rear of the AT-1000 Pro, also using 50- ohm coaxial cable rated at the maximum power output capacity of the amplifier. If a second antenna system is used, connect that antenna system to the ANT 2 jack. -
Page 10: Front Panel Button Description
In addition, some buttons have additional secondary functions that are activated after first putting the AT-1000 Pro into FUNC mode. FUNC mode is activated by pressing and holding the Power/Func button until all the front panel LEDs light up, then releasing it. The Auto, Ant1, C Up, and Tune LEDs will begin flashing to indicate they are ready to accept a command in FUNC mode. -
Page 11: Ant1 / Scale Button
Press Power / Func again to set and exit. The front panel of the AT-1000 Pro does not have a “Peak” label on the C Up button, as the peak reading feature was introduced after the initial release of the AT-1000 Pro hardware. -
Page 12: C Dn Button
C Dn Button Pressing the C Dn button will decrease the capacitance in parallel with the load by one unit. Pressing and holding the C Dn button will rapidly decrease the capacitance. If the minimum capacitance value is met, the C Dn button will blink. L Up Pressing the L Up button will increase the inductance in series with the load by one unit. -
Page 13: Operation - Basic Tuning
In this manner, the AT-1000 Pro “learns”; the longer you use it, the more closely it adapts itself to the bands and frequencies you use. Most users will probably use memory tuning most of the time;... -
Page 14: Semi-Automatic Tuning: Request Memory Tune Cycle
When not tuning, the cross-needle meter on the AT-1000 Pro will display peak forward power and instantaneous reflected power. If the 100W meter scale is selected, and more than 125 watts of forward power are present, the front panel LEDs will blink to indicate the over-range condition. -
Page 15: Semi-Automatic Tuning: Request Full Tune Cycle
Semi-Automatic Tuning: Request Full Tune Cycle To request a full tuning cycle, press and hold the Tune/Store button until the Tune LED lights, then keep holding until the Tune LED extinguishes again, then release. Begin transmitting a carrier of less than 75 watts. When the tuning cycle is complete, the front panel LEDs will blink to show the status of the tune, and the cross-needle display will show the final SWR. -
Page 16: Operation - Fine Tuning
The button’s LED will blink when the limit of inductance or capacitance is reached. The AT-1000 Pro uses an L-network for tuning. In order that a broader range of antenna loads may be matched, a relay allows switching the capacitance arm of the L from the transmitter side of the inductor bank to the antenna side of the inductor bank. -
Page 17: Operation - Led Blink Codes
OPERATION - LED BLINK CODES Various error or warning conditions are indicated by the front panel LEDs. PAGE 17... -
Page 18: Application Hints
IC-706. Simply plug the 1/8” plug of the optional Icom interface cable into the Radio Interface jack on the back of the AT-1000 Pro, and plug the 4-pin Molex plug into the matching jack on the back of the radio. -
Page 19: Theory Of Operation
, but a little background will help in understanding what the AT-1000 Pro is doing, and how it does it. In simple DC circuits, the wire resists 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 the principle in... - Page 20 SWR meter until a minimum SWR is reached. The LDG Electronics AT-1000 Pro automates this process. No tuner will fix a bad antenna. If the antenna is far from resonance, the inefficiencies inherent in such operation are inescapable; it’s simple physics. Much of the transmitted power may be dissipated in the tuner as heat, never reaching the antenna at all.
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Page 21: The Ldg At-1000 Pro
This allows the AT-1000 Pro to handle loads that are either greater than or less than 50 ohms. All relays are sized to carry 125 watts continuously. -
Page 22: A Word About Tuning Etiquette
LDG products our website also has complete product specifications and photographs you can use to help make your purchase decision. Don’t forget the links to all of the quality LDG Dealers also ready to help you make that purchase decision. -
Page 23: Out Of Warranty Service
Ask your shipper for a tracking number or a delivery verification receipt. This way you know the product arrived safely at LDG. Be sure to give us your email address so our shipper can alert you online when your product is en-route back to you. Please be assured that our staff makes every effort to complete repairs ahead of our published wait time.
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