LDG AT-200Pro Manual - page 12
12
Tuning
Auto and Semi-Auto Modes
In Auto mode (see section on selection Auto or Semi mode) the tuner will begin a tuning cycle
whenever the SWR exceeds the value you set (see section on setting autotune threshold). In Semi
mode a tuning cycle begins only when you start one by pressing the
Tune
button, regardless of
SWR. You can also start a Semi tuning cycle while the tuner is in Auto mode. Your personal
operating practices will determine which mode is best for you. The default mode is Auto.
Auto mode tuning works well while you are transmitting in SSB, AM, CW or any digital mode.
Recent advances in LDG's tuning algorithms allow your AT-200Pro to tune effectively even with
a varying RF signal. This means that as you change frequencies, antennas or bands, you don't
have to make a separate tuning transmission; just start talking and your AT-200Pro will match up
in as little as 0.2 seconds.
Memory Tuning
This is pretty amazing, so lash yourself to the mast; your AT-200Pro has 16,000 3-D frequency
memories; 8,000 memories for
each
antenna port. They store the tuning parameters for each
frequency as you tune; that's 2,000 memories for
each of four different antennas
on each of the
two ports. You can use a wide variety of antennas, connecting them to the two antenna ports as
needed. Think of it; you could be using a Yagi, Quad, Loop or Vee on the Ant A port, and a
Dipole, Vertical, Longwire or J-Pole on the Ant B port, connecting them as needed (or switching
them through an external coax switch), and
each of them
will have 2,000 dedicated memories.
When you transmit on or near a memorized frequency again, the tuner finds the best match for
that port and antenna and resets those parameters in a fraction of a second, much faster than a full
tuning cycle. This will work best if you always use a particular antenna on the same antenna port
each time.
When you tune, you can select between a Memory tune and a Full tune. If you select Memory
tune and there is no appropriate memory data, the tuner will automatically begin a full tuning
cycle. Tuning parameters are stored in EEPROM memory, and are retained indefinitely, even if
power is removed.
Full Tuning Cycle (Long press)
Set your transmitter or transceiver to SSB, AM, FM, CW or Packet mode, and a power level of no
more than 125 watts if your radio has a power rollback circuit. If your radio lacks a rollback
circuit (see your owner’s manual), set the power level to no more than 25 watts.
Press the PTT switch on the microphone (close key on CW) to transmit a carrier, or simply begin
talking on SSB or AM. While transmitting, press and hold the Tune button on the front of your
AT-200Pro for at least 2.5 seconds.
Long Press > 2.5 Sec for Manual Tune