3
Introduction
Congratulations on selecting the LDG AT-200PC tuner. The PC-controlled AT-200PC provides
fully automatic, any mode antenna tuning across the entire HF range plus 6 meters at power
levels to 250 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. There are no controls or indicators on the tuner itself -- all functions are
controlled by software.
The AT-200PC represents a quantum leap in features and performance. Enhanced tuning
algorithms provide much faster, precise and consistent tuning. Automatic tuning is now available
during
transmission, even SSB, and many user-settable options are accessible from the front
panel. The LEDs provide simultaneous readings of power and
SWR
, and readouts of internal
states and settings. LDG's design provides instant memory tuning for up to four different antennas
on each of the two antenna ports.
LDG pioneered the automatic, wide-range switched-L tuner in 1995. From its laboratories near
the nation’s capitol, LDG continues to define the state of the art in this field with innovative
automatic tuners and related products for every amateur need.
Jumpstart,
or
“Real hams don’t read manuals!”
Ok, but at least read this one section before you transmit:
1. Connect the antenna jack on your transceiver to the "Tx" jack on your AT-200PC
tuner using a 50 Ohm coaxial cable jumper of appropriate power handling capability.
2. Connect your 50 Ohm antenna coax lead to the "Ant 1" jack on the back of your AT-
200PC.
3. Connect your AT-200PC to a source of 11 - 16 volts DC @ 750mA via the 2.5 by 5.5
mm power jack on the back (center positive).
4. Connect the AT-200PC to your PC via an available serial data port.
5. Power up your transceiver and select the desired operating frequency.
6. Run your PC tuner control software and select the appropriate COM port.
7. Begin transmitting, any mode
1
.
8. Click the Tune button on the PC tuner control software.
9. Wait for the tuning cycle to end; stop transmitting.
10. You’re now ready to operate.
1
If using SSB mode, simply speak into the microphone. You can tune while transmitting up to 125 watts if
your transceiver has a “roll-back circuit” to protect it from high SWR. If it does not have a roll-back circuit,
limit power when tuning to 25 watts to avoid damage to your transmitter or transceiver.
