User's Manual | ACOM 700S | 1.8-54 MHz Linear Amplifier
May 2021
S e c t i o n OPERATION | Page 29 of 52
4.3.
Operation with an External Antenna Tuner
At antenna SWR over 1.5:1, it is advisable you use an external tuner.
The ACOM 04AT Remote Automatic Antenna Tuner and Switch (see
Figure 4-1 ACOM 04AT Remote Automatic
) is designed to work with our transistor (solid state) amplifier series, including the
ACOM 700S.
It tunes antennas having SWR up to 3:1 automatically, thus providing an optimum load for the amplifier
within 5 seconds with improved harmonic suppression at that. The four-way antenna switch is controlled
automatically or from the amplifier front panel.
The ACOM 04AT can be installed both in the shack and in a remote location (even out in the open, close to
the antennas). It can be distanced up to 100 m (330 ft) from the amplifier, using a single coaxial cable.
The connection of ACOM 04AT will make accessible specific features on the amplifier display that provide a
transparent operation by following frequency and antenna selection changes in less than 50 ms. The
operation of ACOM 700S with ACOM 04AT is described in detail in the ACOM 04AT User's Manual (available
for download at
).
Use of other antenna tuners is not recommended.
Figure 4-1 ACOM 04AT Remote Automatic Antenna Tuner and Switch