ACOM ATU 04AT Remote Antenna Tuner

• Powered and controlled directly from the ACOM solid state HF+6m amplifiers through the amplifier RF output cable only - there is no need for power or control cables between the shack and the tuner.
• Provides automatic or manual antenna change and automatic antenna impedance matching to the ACOM solid state HF + 6m amplifiers, controlled entirely from the amplifier front panel and your transceiver CAT.
• Guards the transceiver and amplifier against excessive impedance mismatch during the tuning process.
• Operates with two types of tunings: full tuning (basic matching cycle) and fast tuning (retrieving user tuning patterns from nonvolatile memory.
• Full tuning is 100% automated however a cycle is initiated only by the operator. User tunings track the antenna and frequency changes automatically during amplifier and transceiver operation.
• Four typical antenna types: Regular, Sharp, Wide, and Fixed-frequency are available so the operator can adapt the frequencysegment width to the specific antenna bandwidth; BYPASS mode is also available.
• Antennas appear with a number, type, and user-editable name on the ACOM solid state amplifiers screen.
• Tunings availability presented by a graphic scale on the ACOM solid state amplifiers screen.
• A plenty of antenna- and tuner- related information is available on the ACOM solid state amplifier screen: menus ATU SERVICE, ATU MEASURE, ATU TUNINGS LOOKUP/ERASE, Resource-estimate function etc.
• Tuning “age” warning can be set to warn you when you attempt to use an outdated tuning.
• The user can archive all tunings from nonvolatile memory in a computer file as well as upload earlier archived files in the ACOM 04AT nonvolatile memory through the ACOM solid state amplifier’s RS232 port.
• Protections: PS voltage, Reverse PS polarity, Excessive RF voltage, RF current or reflected power at the antenna outputs,
• Excessive tuning power, Excessive Input power, Hot switching of relays, Overheating etc.
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• Protected against building of static electricity in the antennas via bleeding resistors and against close lightning strikes via gasfilled discharger; unused antennas are directly grounded during operation as well as all antennas are when the ACOM 04AT is powered off.

• Frequency coverage: 1.8 to 30MHz and 50 to 54MHz, continuously (30 to 50MHz on request).
• Antenna impedance matching capability: all impedances with 50 Ohm-SWR between 1 and 3; (for some higher-SWR impedances matching is also possible

- see power limitations below).

• Maximum RF Input power admissible, average or continuous (no mode limitations; in brackets - PEP):

-At antenna SWR below 2:1500W (1500W PEP);

-At antenna SWR between 2 and 3:1200W (1500W PEP);

-At antenna SWR between 3 and 5 (provided matching is possible): 700W (1000W PEP);

-At antenna SWR between 5 and 10 (provided matching is possible): 350W (500W PEP);

• Rem: Operation at SWR above 10 is not permitted even though matching could be possible in some cases.
• RF Input characteristics:

-Nominal impedance: 50-Ohm unbalanced;

-Connector type: UHF/PTFE (S0239A);

-Input SWR during full tuning (basic matching cycle): below 1.8;

-Input SWR soon after full tuning: less than 1.5 (below 1.3 typ.).

• Antenna output characteristics:

-Nominal impedance: 50-Ohm unbalanced;

-Connector type: UHF/PTFE (S0239A);

-Number of outputs - 4;

-Antenna SWR: between 1 and 3 for 100% matching, full power; for higher-

• SWR impedances (provided matching is possible) see power limitations above).
• Full tuning duration (basic matching cycle):

-Below 10MHz: less than 5s (2-3s typ.)

-Above 10MHz: less than 3s (1-2s typ.).

• RF Input power required during full tuning: 25W +3/-3 dB (12.5 to 50 W), non-modulated.
• Fast tuning duration: less than 50ms (from nonvolatile memory).
• Power supply and control: available from the ACOM solid state HF+6m amplifiers through RF-output coaxial cable; +26VDC, up to 25 W consumption; control data using a FSK modem at 60 kHz.
• Coaxial cable maximum length (same for RF power, DC power supply, and control):

-61 m (200 feet) for cable type RG-58;

-305 m (1000 feet) for cable type RG-213.

ATTENTION! In order to keep possible RF loss at a minimum, use only the minimum length needed to install the ACOM 04AT tuner and switch as close to the antennas as practical.

• Size and mass (operating) W 510 mm (20.1”) x D 400 m (15.8”) x H 300 m (11.8”); 7.0 kg (15.43 lbs).
• Operating environments:

-Weather protection: IP 53 (NEMA Type 3);

-Temperature range: -40 to +65 degrees C (-40...+150F);

-Humidity: up to 98% @ +40 degrees C (104F);

-Height ASL without parameters deterioration: up to 3050 m (10 000 feet).