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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-1000ProII 1000-watt automatic tuner.
The AT-1000ProII provides fully- and semi-automatic antenna tuning across the entire HF
spectrum plus 6 meters, at power levels up to 1000 watts (250W 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 some tuners you may have considered, including the built-in
tuners on many transceivers.
The AT-1000ProII is designed to handle 1000 watts of output power, and is ideal for use
with small outboard linear amplifiers rated up to 1000 watts, or even newer high power
transceivers.
JUMPSTART, OR “REAL HAMS DON’T READ MANUALS!”
Ok, but at least read this one section before operating the AT-1000ProII:
1.
Connect a 50-ohm coax jumper cable from the antenna jack on your amplifier to the TX jack on
the back of the AT-1000ProII. (This cable must be rated to 1000 watts.)
2.
Connect your antenna’s 50-ohm coax feedline to the ANT 1 jack on the rear of the AT-
1000ProII.
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, 1000 mA. The jack center tip is positive.
4.
Power up the transceiver, and select the desired operating frequency and mode.
5.
Bypass the amplifier.
6.
Make sure Antenna 1 is selected (ANT 2 LED is off). Press ANT to toggle.
7.
Begin transmitting, any mode
1
.
8.
When the tuning cycle completes, activate the amplifier, and you’re ready to operate!
Note
: With the amplifier active, it is suggested to place the AT-1000ProII in semi-automatic
tuning mode to avoid re-tuning at high power levels.
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.
Summary of Contents for AT-1000PROII
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