LDG AT-1000 Manual - page 5
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On the back panel, there are four connectors:
•
DC power input (2.5 x 5.5 mm coaxial power connector, center pin positive)
•
RF in (standard SO-239 socket)
•
RF out (standard SO-239 socket)
•
Ground (wingnut)
“What’s the deal with the hole?” Sharp -eyed users will note an empty cutout labeled “Control” on the back
panel. Future versions of the AT-1000 may feature remote control and monitoring via a DB-9 connector in
this position. This feature may also be offered as an upgrade for present users, but is not available at this
time. In this version, the cutout serves no function. Never insert anything into this cutout, especially when
transmitting.
Installation
Your AT-1000 is intended for indoor use only; it is not water-resistant. If you use it outdoors (Field Day,
for example) you must protect it from rain. Place your AT-1000 as near as practical to your exciter (your
transceiver or transmitter) and your amplifier, keeping free access to the front panel controls. You should
avoid placing other equipment on top of your AT-1000 if possible to aid in cooling.
Grounding will significantly improve the safety and performance of your tuner. Attach the ground
connection on the back panel to a suitable ground using heavy-gauge wire or metal braid. A dedicated
outside ground rod is best, but a nearby cold water pipe is usually satisfactory. If no other ground is
available, the screw holding the cover on a power outlet is a usable ground.
Connect the socket marked “Transmitter” on the back of your AT-1000 to your amplifier output using
high-quality 50-ohm coaxial cable and PL-259 plugs. Do not use crimp -on plugs for this connection; only
properly soldered plugs will be safe and provide satisfactory performance. The coaxial cable should be
rated for the maximum output of your amplifier. Keep the cable as short as practical.
Attach your antenna lead-in coax to the socket marked “Antenna” on the rear of the tuner with a soldered
PL-259 plug. Your AT-1000 is intended for use with coax-fed (unbalanced) antennas only. If you wish to
use it with antennas fed with ladder-line, or with longwire antennas you must provide a suitable balun to
adapt your AT-1000 to the balanced load. LDG does not presently sell a balun that handles 1,000 watts, but
they are readily available from many ham radio vendors.
Your AT-1000 requires 11 – 15 volts DC at 1 Amp. If your exciter runs on 12 volts DC, you can use the
same power supply for your AT-1000 if it can provide the necessary 1 Amp current; otherwise, you will
need a separate power supply. We recommend a regulated supply, b ut an unregulated one may be used with
satisfactory results. Connect the power supply to the DC power jack on the back of your AT-1000 using the