ACOM 04AT Features:

Operating Frequency Range

• Continuous from 1.8 to 30 and from 50 to 54 MHz;
• Extensions and/or changes on request;

Minimum Range of the Matched Impedances (at Each of the Four Antenna Outputs)

• All impedances with SWR from 1:1 to 3:1 towards 50 Ohm, any phase angle, unbalanced input and output;
• For some frequencies and impedances, matching is possible at SWR above 3:1 at the antenna output (up to 10:1), but the maximum allowed power is reduced;

Maximum Allowed Input Power (PEP, Mean or Continuous Carrier, Without Mode Limitation)

• At antenna SWR below 2.5: 1500 W;
• At antenna SWR between 2.5 and 3: 1200 W;
• At antenna SWR between 3 and 5 (provided matching is possible): 500 W;
• At antenna SWR between 5 and 10 (provided matching is possible): 200 W;
• Operation with SWR above 10:1 is not allowed;

RF Input Characteristics

• Rated impedance: 50 Ohm unbalanced;
• Input connector type: UHF/PTFE (SO-239A) - 1 pc.;
• SWR during full tuning (basic cycle): no higher than 2:1;
• SWR immediately after full tuning: no higher than 1.5:1 (1.3:1 typically);

Antenna Outputs Characteristics, Antenna 1 to Antenna 4

• Rated impedance: 50 Ohm unbalanced;
• Maximum antenna output SWR: 3:1 (up to 10:1 with RF power limitations;
• Output connectors type: UHF/PTFE (SO-239A) - 4 pcs;

Full Tuning Duration (Basic Cycle) Basic cycle for preparation of user full tuning settings, with automatic storage in the non-volatile memory:

• In the range of 1.8 to 10 MHz: no more than 5 seconds (2-3 seconds typically);
• In the range of 10 to 54 MHz: no more than 3 seconds (1-2 seconds typically);

Input Signal Needed to Prepare User Tuning Settings

• Non-modulated carrier power 25 W +3/-3 dB (12.5 to 50 W);

Power Supply

• +26 VDC +10/-15%, consumption of 25 W at most;
• Supplied by an amplifier of the ACOM transistor series over the input RF coaxial cable;

Remote Control

• The remote control and indication from an amplifier of the ACOM transistor series is provided over the input RF coaxial cable of the tuner using a 60 kHz / 4800 bps bidirectional FSK modem.;

Maximum Length of the Input Coaxial Cable

• The maximum length of the RF coaxial cable between the amplifier output and the tuner input is 100 m (330 ft) for a cable of RG213 type or similar. The cable characteristic impedance should be 50 Ohm and the DC resistance should be below 1 Ohm for inner and outer conductors altogether;

Size & Weight (operating, excluding fastening elements and connected cables)

• WxDxH: 345x250x190 mm, 4.2 kg (13.6x9.9x7.5 inches, 9.3 lbs.);

Shipping Size & Weight

• WxDxH: Approx. 520x400x300 mm, 7.0 kg (20.5x15.8x11.9 inches, 15.5 lbs.);

Operating Environment

• Protection class: IP 53 (NEMA Type 3);
• Temperature range: -40 to +65 degrees Celsius (-40 degrees F to 150 degrees F);
• Relative air humidity: up to 98% @ +40 degrees Celsius (104 degrees F);
• Height above sea level: up to 3050 m (10000 ft) without output deterioration.