OM Power OM-4001HFMARS HF Plus MARS Manual Tune 1,500W+ Linear Amplifiers features two FU-728F Ceramic Tetrode tubes capable of providing stable, full legal limit all mode output power and frequency coverage of the Amateur bands ranging from 1.8 to 29.7MHz. CW enthusiasts will enjoy QSK – full break-in operation. The Intuitive 4.3-Inch color Touch Screen and front panel indicators allow you to stay informed about the operational status of the amplifier and effortlessly gain access to advanced features and settings. The OM-4001HFMARS is one of the most compact, rugged and capable 1,500W+ manual tuning linear amplifiers available.

The OM Power OM-4001HFMARS Amplifier features an arsenal of protection circuits that will guard against high SWR, excessive current, voltage errors, excessive temperatures and more. A mechanical safety switch provides “switch-on” blocking and protects the user from potential hazards by not allowing the amplifier to power on when the case is opened. These amplifiers are also equipped with safety devices to ensure that the output relay is not mistakenly switched under power (hot switching). Built-in Memory for faults and warnings makes troubleshooting a breeze and helps to quickly identify issues and resolve them, ensuring uninterrupted performance. With built-in Automatic Anode Current (BIAS) Adjustment, there is no need to make complicated manual adjustments in the unlikely event that the tubes need to be replaced.

The 2-speed centrifugal fan and external axial fan provides the necessary cooling of the amplifier, even during long contests. The blower is activated by switching the PA on and it is turned off when cooling is finished (approx. 1-5 min after switching off the PA depending on the temperature of the tube) and the blower working mode is programmable with up to 3 modes.

Experience the perfect blend of power, protection, and performance. Order an OM Power OM-4001HFMARS HF Plus MARS Manual Tune 1,500W+ Linear Amplifier from DX Engineering.

NOTICE: The legal operation of any linear amplifier within the applicable regional or country Amateur Radio regulations is the responsibility of the licensed operator."

Additional Features and Specifications:

• Frequency Coverage: Amateur Bands 1.8 – 29.7MHz / +MARS

• Power Output:

- 1,500W+ SSB/CW on HF

- 1500W - Digital Modes

*Note Output power for the MARS frequencies vary, refer to the “MARS Operating Chart” listed under the documentation tab.

• Input Power: Normally 40 to 60W for full output power

• Input Impedance: 50 Ohm, SWR < 1.5:1

• Power Gain: 17dB (USA models)

• Output Impedance: 50 Ohm unbalanced

• Maximum Output SWR: 3:1

• SWR Protection: Automatic switching to STBY when reflected power is 350W or higher

• Intermodulation Distortion: -32dB below nominal output

• Suppression of Harmonics: < -50dBc

• Tube: Two FU-728F Ceramic Tetrode

• Cooling: Internal Centrifugal Fan, External Axial Fan

• Power Supply: USA model 240VAC 60Hz (230 or 250V Internal jumper selectable)

• Transformers: Two 3kVA Toroidal Transformers

• Protection Circuits:

- High SWR

- Anode Current is too high

- Anode Voltage error

- Screen Current too high

- Screen Voltage error

- Grid current too high

- Grid Voltage error

- Heating Voltage error

- Mistuning of the power amplifier

- High Temperature

- Soft start for Fuse Protection

- "Switch–on Blocking" when amplifier chassis is opened

• Display: 4.3 in. color touch screen display

Feature Highlights:

- High level of protection

- Memory for faults and warning, easy maintenance

- Automatic set-up anode current (BIAS) – no need to adjust manually after changing the tube

- Many operational parameters on display

- Full QSK