Related Manuals for LDG AT-897
Summary of Contents for LDG AT-897
- Page 1 AT-897 Automatic Antenna Tuner Manual Version 1.1 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...
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Page 2: Table Of Contents
LDG AT-897 Automatic Antenna Tuner for the FT-897 Table of Contents Introduction Jumpstart, or “Real hams don’t read manuals!” Features Specifications Getting to know your AT-897 Installation Mounting your AT-897 tuner Standard Connections Normal operation Full Tune Bypass mode A word about tuning etiquette... -
Page 3: Introduction
Introduction Congratulations on selecting the LDG AT-897 tuner. The AT-897 is designed to work as an integrated component of your Yaesu FT-897 transceiver. It will tune dipoles, verticals, Yagis or virtually any coax-fed (unbalanced) antenna. It will match an amazing range of antennas and impedances, far greater than some other tuners you may have considered. -
Page 4: Features
Automatically matches antennas from 6 – 800 ohms impedance, or a 10:1 SWR • Very low current consumption: 300 mA during turning, less than one microamp in standby, or can be turned off completely. No cooling fan needed! Your AT-897 is ideal for battery-powered operations. •... -
Page 5: Getting To Know Your At-897
The four side feet from your AT-897 fit on the tuner so you can set it down on its side without danger of scratching the finish. While your AT-897 is intended to be integrated with your FT-897 transceiver, you can use the tuner simply sitting on a table, not mounted on the FT-897 transceiver. -
Page 6: Installation
CAT Out: provides CAT connection for external functions • OTT: Y-ACC radio interface (cable provided) Installation Your AT-897 tuner is intended for indoor use; it is not water resistant. If you use it outdoors (Field Day, for example) you must protect it from rain and excessive moisture. -
Page 7: Mounting Your At-897 Tuner
Carefully set them aside; you’ll reinstall them in a few minutes. 3. Remove the cover of your AT-897 tuner by removing the four flat-head screws on the top and bottom right of the tuner (as you look at it from the front). Again, set these aside for later re-installation. -
Page 8: Standard Connections
Standard Connections Connect the CAT port on your FT-897 transceiver to the CAT In port on the back of you AT-897 tuner with the cable provided. The CAT Out port on the back of your AT-897 provides pass-through of all CAT functions for connection to external systems. -
Page 9: Normal Operation
Full Tune If you want to force a full tune cycle, press and hold the tune button on the AT-897 until the red light comes on, then goes off, then release. The radio will transmit a carrier and the tuner will start a full tune (does not look at the memories). -
Page 10: Theory Of Operation
AT-897 is doing, and how it does it. In simple DC circuits, the wire resists the 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... - Page 11 The operator adjusts them by hand while observing reflected power on the SWR meter until a minimum SWR is reached. Your LDG AT-897 automates this process. No tuner will fix a bad antenna. If your antenna is far from resonance, the inefficiencies inherent in such operation are inescapable;...
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Page 12: The Ldg At-897
The LDG AT-897 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 inductor banks, seeking the lowest possible SWR. -
Page 13: Care And Maintenance
AT-897, we'll send you a free upgrade as a “thank you”. We encourage everyone who uses the AT-897 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 our products in use; we frequently place such pictures on our Web site (www.ldgelectronics.com).