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1. GENERAL INFORMATION
1.1 Introduction and Description
This manual explains the installation, operation and maintenance of the ACOM 03AT Automatic HF Antenna Tuning
Unit.
The Automatic HF Antenna Tuning Unit (AATU) model ACOM 03AT is a complete and self-contained unit for
automatic matching of HF symmetrical-antenna impedance to an unbalanced 50Ω o utput, that covers a continuous
1.8 to 16MHz frequency range and will withstand 200 to 2500W input power depending on the antenna SWR used.
Input power up to 1000W is permissible in the whole frequency range when antenna SWR is 10:1 or better. For SWR
up to 50:1, matching is still possible but the frequency range and input power are restricted. AATU features a
Remote Control Unit (RCU) and can be controlled via an optical link, up to 50m long.
All indicators and controls are available via the RCU. All command input to the RCU is menu-driven.
1-2. Owner Assistance
If assistance is needed, you should contact your local dealer first. If you still have an issue you need to discuss with
one of ACOM's specialists. The contact information is as follows: phone (+359 2) 920 96 55, fax (+359 2) 920 96 56,
e-mail
acom@mail.orbitel.bg
1-3. Equipment Supplied and Options
The ACOM 03AT AATU is shipped in a single cardboard carton. It contains three internal cartons:
one internal carton, containing the remote AATU unit, the RCU, and installation accessories;
-
a second internal carton containing the power supply cable, and
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a third internal carton with the optical control cable.
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A coaxial cable to the station is not included. It is normally a part of the antenna set.
Use type RG213 or equivalent.
Options:
- Unbalanced output with 50
- Serial control port for the ACOM2000A HF Linear Amplifier and for ACOM2000S Automatic Antenna Selector;
- PC control via RS232 or RS422 serial port.
1-4. Features
•
Easy to operate. The only operator's obligation is to apply CW power, while the matching process is fully
automatic.
•
Nonvolatile memory for 99 different user's tuning settings and selection of the power-on default.
•
LCD comment display. All AATU status indications are explained via detailed text displayed on the dot-matrix,
back-lighted liquid crystal display (LCD) on the RCU.
•
Less interference and improved electromagnetic compatibility during tuning. Retuning can be achieved in 8s (2-
3s typical) and at reduced RF power (10-100W).
•
Guards your transmitter during the tuning process against excessive impedance mismatch via inserting a
powerful attenuator at the input, and removing it after that.
•
The RF power is disabled during each commutation in order to save the vacuum RF-relay contacts, as well as to
keep the emitted spectrum as narrow as possible during the tuning process.
•
Improves harmonic emission suppression of your transmitter since the matching circuit represents a low-pass
Pi-filter.
•
Saves space on the operating desk. Since the AATU is controlled by the RCU only, the remote unit can be
located up to 50m from the operation position.
or by mail: Bul. Nikola Mushanov 151, 1330 Sofia, Bulgaria.
Ω
UHF(SO239A) connector;
NOTE
2
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