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Related Manuals for LDG AT-600Pro
Summary of Contents for LDG AT-600Pro
- Page 1 AT-600PRO OPERATIONS MANUAL MANUAL REV A LDG AT-600Pro 600W Automatic 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 Jumpstart, or “Real hams don’t read manuals!” Specifications An Important Word About Power Levels Important Safety Warning Getting to know your AT-600Pro Front Panel: Back Panel: Installation BASIC Operation Using the Front Panel Buttons User Configuration Options... -
Page 3: Introduction
The AT-600Pro is designed to handle 600 watts of output power, and is ideal for use with small outboard linear amplifiers rated up to 600 watts, or even newer high power transceivers. -
Page 4: Specifications
Dimensions: 10.5” x 8.5” x 2.8”Weight 3 pounds. AN IMPORTANT WORD ABOUT POWER LEVELS The AT-600Pro is rated at 700 watts maximum power input at most. Many amplifiers output well over 700 watts. Power levels that significantly exceed specifications will definitely damage or destroy your AT-600Pro. -
Page 5: Getting To Know Your At-600Pro
GETTING TO KNOW YOUR AT-600PRO Your AT-600Pro 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-600Pro features eight pushbuttons, two LED bargraph scales, and two indicator LEDs: Power: Turns the unit on or off. -
Page 6: Back Panel
The power button on the AT-600Pro actually places the tuner in bypass and enters a low- power sleep mode, rather than turning the unit fully off. Press the Power button for 3 seconds to turn off, or momentarily to turn on. -
Page 7: Installation
Connect the HF antenna jack on the amplifier to the TX jack on the back of the AT-600Pro, using a 50 ohm coax cable rated 600 watts or higher. - Page 8 PAGE 8...
- Page 9 Note: Optional Y-ACC cable has a red plug on the radio end of the cable, and a black plug on the tuner end. PAGE 9...
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Page 10: Basic Operation
Function mode, which is done by pressing and releasing the Func button, and then pressing the desired button to activate the particular configuration option while in function mode. To confirm entry into Function mode, the AT-600Pro will flash an “up arrow” on the LED display after the Func button is pressed. - Page 11 Function mode times-out after a few seconds if no other button is pushed. Alternately, function mode can be cancelled by pressing the Func button again. In either case, when Function mode is exited, a “down arrow” is displayed on the LED display: Peak Mode On/Off: The Power display on the LED bargraph can display either average power or peak forward power, in watts.
- Page 12 To toggle between these two scales, press Func -> L Up. The LED marked “50” or “600” will light momentarily to indicate the newly selected scale. Automatic Tuning Mode: The AT-600Pro may be set for either semi-automatic tuning or fully automatic tuning. In semi-automatic tuning mode, a tuning cycle will not begin unless specifically requested by pressing the Tune button.
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Page 13: Transmitting And Receiving
The default value of SWR threshold is 2.0:1. The following example shows setting the SWR threshold to 1.7:1. Antenna Selection: Press the Ant button momentarily to toggle which antenna port is currently active. The ANT 2 LED will light when Antenna 2 is selected, and is off when Antenna 1 is selected. -
Page 14: Tuning
TUNING Basic Tuning Operation A tuning cycle on the AT-600Pro is initiated from either the Tune button on the front of the AT-600Pro, an over-SWR condition when in fully automatic tuning mode, or from pressing the TUNER/CALL button on the front of an ICOM radio connected using the ICOM interface cable. -
Page 15: Manual Full Tune
150 watts during tuning. If the memory tune is not successful, the AT-600Pro falls through to full tuning cycle. At the end of a tuning cycle, the LEDs cycle inwards to indicate a successful tune. You may then activate the amplifier, and begin transmitting. -
Page 16: Bypass Mode
When in bypass, the Bypass LED is lit. If an ICOM radio and interface cable is used, the AT-600Pro may also be bypassed by pressing the TUNER/CALL button momentarily. On some models of ICOM radios, changing bands will also automatically bypass the tuner. - Page 17 Additionally, if the forward power exceeds the maximum value selected for the meter scale, the PWR LEDs will blink an over-range condition. The four right-most LEDs of the PWR bargraph will cycle during over-range. PAGE 17...
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Page 18: Advanced Operation
In some rare cases, after tuning, it may be desirable to adjust the inductance and capacitance settings that the AT-600Pro came up with during the tuning process. This is more likely to occur when attempting to tune an antenna far from its resonant frequency. -
Page 19: Status Check
SWR threshold value. While holding the Func button, the bargraph display will show the following pattern, to indicate that the AT-600Pro is waiting for you to push a button to check its status: The following status items can be checked:... -
Page 20: Application Notes
With the AT-600Pro mounted, for example, in the trunk, simply set the AT-600Pro for fully automatic mode. It will automatically tune any time the SWR exceeds the preprogrammed threshold. -
Page 21: Theory Of Operation
, but a little background will help in understanding what the AT-600Pro 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 22 SWR meter until a minimum SWR is reached. The LDG Electronics AT-600Pro 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;...
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Page 23: The Ldg At-600Pro
This allows the AT-600Pro to handle loads that are either greater than or less than 50 ohms. All relays are sized to carry 600 watts PEP. -
Page 24: Quick Reference
Be sure to use a vacant frequency when tuning. With today’s crowded ham bands, this is often difficult. However, causing interference to other hams should be avoided as much as possible. The AT-600Pro’s very short tuning cycle, as little as a fraction of a second, minimizes the impact of tuning transmissions. -
Page 25: Care And Maintenance
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 26: Returning Your Product For 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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