ARRAY SOLUTIONS DU-1500L User Manual

DU-1500L antenna tuner

ARRAY SOLUTIONS

2611 N Belt Line Road - Suite 109
Sunnyvale, TX, 75182, USA
[phone] office
[phone] fax

[e-mail]
www.arraysolutions.com

User’s Manual

DU 1500L Installation

Model DU 1500 L is high power antenna tuner that uses and adjustable reactive network for
matching the unbalanced 50 ohm output impedance of transmitters and transceivers to a
variety of balanced and unbalanced loads.
It is usable over a frequency range of 1.8-30 MHz. Provision is made for selecting one of
three antennas or for bypassing the matching network.
A crossed needles SWR and wattmeter with switchable 200 and 2000 watt scales and
selectable peak and average power output reading is included.

Transmitter Connection

The DU 1500 L is designed for connection to transmitters having a 50 ohm nominal output
impedance. Connect the coaxial output of your transmitter to the SO-239 INPUT connector
on the rear panel of the tuner with a 50 ohm coaxial cable.

Grounding

Connect your station ground system to the GND wing nut terminal on the rear panel of the
tuner with heavy braid or wire or a copper strap. The ground connection should go directly to
the earth ground system using a lead as short as possible.

Antenna Connections

Connect antenna transmission line(s) to the appropriate terminal(s) on the tuner as follows.
For 50 ohm coax-fed antennas (unbalanced transmission lines) use COAX 1, COAX 2,
COAX 3.
For a single wire antenna connect to SINGLE WIRE terminal. The SINGLE WIRE terminal
uses the COAX 1 antenna connection.
For balanced feedline systems, adding a jumper from SINGLE WIRE to one of the
BALANCED LINE terminals as shown on the rear panel is required. A tin-plated steel jumper
for this purpose has been provided. It is attached to one wing nut connector on the back; if a
balanced line will be used, attach the other side of the jumper to the other wing nut. Then
connect the open wire or twin lead feedline to the two BALANCED LINE terminals. ANT
position 3 can be COAX 1, (BAL line), COAX 2, COAX 3 must be coax only.

In both single wire and balanced line systems, take special care to route the transmission line
As far away from the station equimpment as possible. Never drape lines over the transmitter.
These lines have high voltage points inside the radio shack which can produce strong RF
fields.

Operation Instructions

The DU1500L Front Panel

The followings set of instructions will allow the operator to quickly place the DU 1500 L into
operation. Included are descriptions of the front panel controls and their functions. This is
followed by instructions for antenna matching and selection, and a brief discourse on antenna
systems matching theory.

(1) Capacitor

This control connects to the variable tuning capacitor used as one of the elements in the L
type matching network.This capacitor has a tuning range of 40-500 pF and it is continuous
tuning with no stops.

(2) Inductor

This control is connected to the roller inductor, another element int he L type matching
network.This inductor has a tuning range of 0.2 to 18 uH which is covered in approximately
30 revolutions of the control knob. A gear reduction system behind the front panel of the
DU1500 L is connected to a concentric turns counter numbered 0 - 29 in a 180 degree arc
over the top of this control, to make returning to earlier settings easier and quicker.