Introduction - Barrett 4015 Operating Manual

4015 MARINE AUTOMATIC ANTENNA TUNER

Introduction

Antennas such as long-wires, vertical whips and loop configurations require an
Antenna Tuning Unit to operate correctly.
Housed in a fully weatherproof enclosure, the 4015 Marine Antenna Tuning Unit
(P/N BC401500) (ATU) will tune long wire antennas effectively from 2.5 to 10
metres and wire loop antennas or whip antennas over a frequency range of 2
to 30 MHz. Tuning is rapid, typically less than one second the first time RF is
applied, either whilst the operator is talking or when the "Tune" control is acti-
vated on the transceiver.
The 4015 ATU features a memory facility that stores the configuration required
to tune to a frequency. On any subsequent use of that frequency, the 4015
reconfigures to the stored settings in, typically, less than 130 milliseconds. Fol-
lowing initial tuning, the antenna's VSWR is monitored. If any significant varia-
tion occurs, the 4015 will re-tune the antenna automatically.
3