UHF 400-470MHz FM/AM/SSB Walkie Talkie Power Amplifier 10W-80W Selectable Power Levels & SWR Display

UHF 400-470MHz FM/AM/SSB Walkie Talkie Power Amplifier 10W-80W Selectable Power Levels & SWR Display

Turn the amplifier on/off
- The functions of the transmit power amplifier and the receiver preamplifier are independent. Both functions can be activated by pressing the RX LNA and TX PA buttons, respectively. When the corresponding button is pressed, the corresponding LED light will light up. When all LEDs are off, the device is completely off.

Change power level
- The transmit power amplifier is equipped with Automatic Level Control loop (ALC) with 8 adjustable power levels (10W, 20W, 30W, 40W, 50W, 60W, 70W and 80W). Press the "SET POWER" button for the first time to enter the power preset mode. The multi-function display bar starts flashing, showing preset power level. Pressing "SET POWER" for the first time will not change the power level, but will show the actual power setting. Continue to press "SET POWER" to change the power setting. If there is no operation for more than 2 seconds, the device will exit the power setting mode.
- Automatic level control is saturation nonlinear and is only suitable for FM modulation. When using the amplifier's AM/SSB modulation, the ALC value is adjusted to a power of up to 50W, and then the received power is adjusted to be close to the power displayed by the bar. Under AM modulation, the carrier power should not exceed 10-15W to adapt to the peak without distortion.
- In SSB adjustment mode, only the 50W LED light is left on, and the bar graph in PEP mode is observed.

Enables/disables SSB mode
- Press the "SSB ON" button to turn on/off SSB mode, and the actual situation is displayed by the relevant LED. When SSB mode is enabled, carrier sensing algorithm, time delays, power meter bar behaviour are changed to address modulation properties. There is no difference in power amplifier biasing itself, since this modern design is inherently linear, unlike elder bipolar transistor based designs.

Using external PTT input
- A small jack for connecting an external PTT (external input) is placed on the rear panel. It turns on the TX mode by connecting the center conductor of the jack with the outer conductor (ground). First of all, turn on the TX PA function, and the corresponding LED will light up. The first time an external PTT is connected, the amplifier will enter the external PTT operation mode. The associated LED will start flashing.
- In external PTT mode, the amplifier no longer reflects the RF signal input from a walkie talkie. On the contrary, every time it is in TX mode, the external PTT signal is already in use. Once SSB mode is enabled, the TX/RX transition delay is still present. The power meter operates in PEP mode. The amplifier remains in external PTT mode until the TX PA button is pressed or the DC power supply is unplugged.

Measure VSWR
- This useful feature allows you to accurately measure the VSWR of the amplifier load. To enable VSWR measurement, press SHOW SWR button while it is transmitting. This mode will persist as long as amplifier is in transmit mode. The display will return to normal operation (power measurement) when the PTT button of the walkie-talkie is released.
- Actual VSWR is represented as single "moving dot". Its minimum value is 1.2. Below 1.2, the corresponding LED light will start to blink. The maximum reading is 1.9. When the value exceeds 2.0, the corresponding LED will flash to indicate that it is out-of-range.
- The built-in high-quality VSWR meter compensates for the non-linearity of the detector, which makes the test results quite independent in terms of output power. In addition, it additionally provides the remaining VSWR directivity from 1.10 onwards.

Meaning of Error Signals
- In the event of an error during amplifier operation, the LED of multi-function display column will turn red. Here are a few errors that occur in amplifier transmit operations.


Package Included:
- 1 x Set of power amplifier

Packaging Details:
- G.W.: 1.3kg