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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 Z-11ProII 100-watt automatic tuner. The Z-11ProII provides
semi-automatic antenna tuning across the entire HF spectrum plus 6 meters, at power levels up to
125 watts. 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 other tuners you may have
considered, including the built-in tuners on many radios.
The Z-11ProII is similar to previous LDG tuners, but is specially designed with battery-
powered operation in mind. It uses little power while tuning, and essentially zero power when in
standby. Onboard solder pads allow easy connection of a user-supplied internal battery pack, for
the ultimate in convenience and portability. The new Z-11ProII uses a lower battery voltage than
previous versions of the Z-11Pro; this means fewer battery cells are required, making the Z-
11ProII even more lightweight than its predecessors.
JUMPSTART, OR “REAL HAMS DON’T READ MANUALS!”
Ok, but at least read this one section before operating the Z-11ProII:
Connect the HF/50 MHz antenna jack on the transceiver to the “TX” jack on the Z-11ProII, using
a 50 ohm coax cable jumper.
Connect the 50 ohm coax antenna feedline to the “ANT” jack on the Z-11ProII.
Connect the Z-11ProII to a source of 7 to 16 volts DC @ 250mA, using the 2.5x5.5mm power jack
on the rear of the Z-11ProII (center positive).
Select the desired operating frequency and mode.
Begin transmitting, in any mode.
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Wait for the tuning cycle to end; you’re now ready to operate!
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If transmitting in SSB mode, simply speak into the microphone. Tuning can occur while transmitting up to 125
watts, if the attached transceiver employs a “roll-back circuit” to protect it from high SWR. If the transceiver does
not have a roll-back circuit, power should be limited to 25 watts when tuning, in order to avoid damage to the radio
or tuner.
Summary of Contents for Z-11ProII
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