Frequency Range: 3-30 MHz

Adjustable Gain: 0-30 dB

Filter Bandwidth: Approximately 1 MHz

Power Supply: DC 12V-13.8V (5.5 x 2.1 mm plug, polarity: Inner positive, outer negative)

Relay Voltage and Current Tolerance: Up to AC 440V/DC 120V, max 8A

Interface Type: BNC female ports (ANT and RX/TX)

Dimensions: 10.4 cm x 6.3 cm x 3.6 cm

1. Shortwave tuned amplifier with transmit and pass-through.2. Signals from the ANT interface are filtered by the built-in shortwave tunable narrowband filter, amplified by a low-noise amplifier, and then sent to the RX/TX interface.3. The bandwidth of the tunable narrowband filter is approximately 1MHz. Adjusting the filter knob to reach the target frequency allows the target frequency signal to pass through, while other frequency signals are attenuated. The filtered signal is then amplified by the low-noise amplifier. The amplifier gain is adjustable; adjust it to a suitable gain based on the strength of the received signal and the dynamic range of the device to prevent receiver overload.4. Built-in relay allows transmission even when the device is off or connected to a PTT signal line. Maximum withstand voltage is AC 440V/DC 120V, and maximum withstand current is 8A. Please use below the maximum withstand voltage and current.5. All rear interfaces are BNC female connectors. Connect the RX/TX connector to the radio or other transceiver equipment or receiver; connect the ANT connector to the antenna.6. The PTT interface is a 3.5mm mono female audio connector.

7. This unit is a receiver amplifier for the center frequency of a shortwave tunable bandpass filter, covering a frequency range of 3-30MHz, with an adjustable gain of 0-30dB. Note:1. If used for both transmitting and receiving, please turn off the amplifier before transmitting or connect the PTT signal cable to the amplifier to control the internal relay switch.2. Prepare a 12V or 13.8V linear regulated DC power supply. The power connector should be 5.5×2.1mm, positive inside and negative outside. Connect it to the black DC jack on the back of the amplifier, confirming that the voltage is normal and the polarity of the connector is correct.3. Press the black button on the right side of the front panel to power on. The green light will illuminate. Connect the PTT; the red light will illuminate when transmitting.4. The TUNE knob is for overall filter center frequency adjustment, allowing the filter to be moved from 3MHz to 30MHz.5. FINE TUNE is for fine-tuning specific frequencies.6. GAIN is for amplifier gain adjustment.

1 x Shortwave Tuned Filter Amplifier