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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.

Congratulations on selecting the LDG Electronics AT-200ProII 200-watt automatic tuner.

The AT-200ProII provides fully- and semi-automatic antenna tuning across the entire HF

spectrum plus 6 meters, at power levels up to 250 watts (100W on 6m). It will tune dipoles,

verticals, Yagis, or virtually any coax-fed antenna. It will match an amazing range of antennas

and impedances, far greater than that of some tuners you may have considered, including the

built-in tuners on many transceivers.

The AT-200ProII is designed to handle 250 watts of output power, and is ideal for use with

newer high-power transceivers.

JUMPSTART, OR “REAL HAMS DON’T READ MANUALS!”

Ok, but at least read this one section before operating the AT-200ProII:

1. Connect a 50-ohm coax jumper cable from the antenna jack on your transceiver to the TX jack

on the back of the AT-200ProII.

2. Connect your antenna’s 50-ohm coax feedline to the ANT 2 jack on the rear of the AT-

200ProII.

3. Connect the supplied DC coax cable to the jack marked 12 VDC. Connect this cable to a DC

source between 11 and 16 volts DC, 1A. The jack center tip is positive.

4. Power up the transceiver, and select the desired operating frequency and mode.

5. Begin transmitting, any mode

6. When the tuning cycle completes, you’re ready to operate!

1 In SSB mode, simply speak into the microphone while transmitting. Tuning may be performed at up to 125 watts of input power, provided that the transceiver

employs a “roll-back” circuit to protect it from high SWR. For transceivers without roll-back circuits, power should be limited to 25 watts when tuning, to avoid

damage to the transmitter or tuner.