ACOM 03AT Automatic Antenna Tuner


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The Automatic HF Antenna Tuning Unit (AATU) model ACOM03AT is a complete and self-contained unit for automatic matching of HF balanced or unbalanced feedlines to an unbalanced 50 Ohm output, that covers 1.8 to 16 MHz frequency range continuously and will withstand 200 to 2500W input power depending on the antenna SWR.


Easy to operate. The only operator obligation is to apply CW power while the matching process is fully automatic.

Guards your transceiver during the tuning process against excessive impedance mismatch employing insertion of a powerful attenuator at the input, and removing it after tuning. ACOM automatic tuner 03AT is protected against relays “hot” switching, excessive antenna voltage, overheating etc.

Remote matching - less losses in the feed line. The main (remote) unit is designed for outdoor-installation requirements. This permits you to locate it close to the antenna feed-points, thus considerably reducing the high-SWR feedline path length.

Operates automatically with any transceiver without special signals - 10W to 100W CW for several seconds is the only input that is required to perform automatic impedance matching.

Optical control link (up to 50 meters) between RCU and remote AATU unit. This design allows to avoid erratic operation in a strong electromagnetic RF field which is the typical case in the near-field zone of an antenna when emitting radio frequency at 1kW - 2kW.

Nonvolatile memory for 99 different users' tuning settings and selection of the power-on default.

Resource-estimate function (STATUS) indicates the percentage of inductors and capacitors involved to achieve a match. This offers a possibility for monitoring the condition of the RF path and the antenna, to forewarn the operator of possible problems.

Features BYPASS function, performed by default also when powered off, where the effect of the inductors and capacitors on the impedance is excluded for broadband operation (the balun transformer will still be in line).

Protected against static electricity via sphere spark gaps and a bleeder choke.

Options: Unbalanced output with 50 Ohm UHF(SO239A) connector; Control for the ACOM2000A HF linear amplifier and forACOM2000S automatic antenna selector; PC control via RS232 or RS422 serial port; Nonvolatile memory for user tunings.



Frequency coverage: 1.8 - 16 MHz continuously; extensions and/or changes on request.

Maximum Input Power, PEP or CW, RTTY, FM, digital etc. (no mode limit), 100% duty cycle:

at antenna SWR up to 3:1 - 2500W, 97% efficiency;
  - up to 5:1 - 1600W, 95% efficiency;
  - up to 10:1 - 1000W, 92% efficiency;
  - up to 20:1 - 500W, 85% efficiency;
  - up to 50:1 - 200W, 60% efficiency.

Input Data:

  - nominal impedance: 50 Ohms unbalanced, connector type UHF/PTFE (SO239A);
  - input SWR during AUTO TUNE procedure: 1.7:1 max;
  - input SWR during OPERATE (matched): 1.5:1 max (1.2:1 typical)

Matching Capability (antenna impedance range, SWR with respect to the nominal load impedance 200 Ohms balanced):

  - 1.8-16 MHz: up to 10:1 SWR (20 Ohms - 2k Ohms).
  - 3-14 MHz: up to 20:1 SWR (10 Ohms - 4k Ohms);
  - 6.5-1 2MHz: up to 50:1 SWR (4 Ohms - 10k Ohms);

Nonvolatile Memory for 99 different user's tuning settings and selection of the power-on default.

Power Supply:

  - RCU: 230 V, +10% / -25% (172-253 V), 50-60 Hz, 80 VA;
  - Remote unit: fed by RCU output "24VAC/3A”

Size & Weight (operating):

  - Remote unit: W 330mm (13”) x D 215mm (8.5”) x H 305mm (12”), 12kg (26.5 lbs.)
  - RCU: W 175 mm (6.9”) x D 255 mm (10”) x H 77 mm (3”), 2.5 kg (5.5 lbs.)

Operating Environment:

  - Remote unit:

   - IP Protection Class: IP53 (NEMA Type 3);
   - temperature range: -40 to +65 degs. Celsius (-40 to 150 F);
   - relative humidity: up to 98% @ +40 degs. Celsius (104 F);
   - height: up to 3000 m above sea level without output deterioration.

  - RCU:

   - temperature range: 0 to +50 degrees Celsius;
   - relative humidity: up to 95% @ +35 degrees Celsius.

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