LDMOS Linear amplifier control system.
LDMOS amplifier control board, where all fast protections are built in hardware, only alarm notifications are software-based. This ensures fast protections regardless of the software.
The Arduino development platform has been used as the "smart" one. The controller board is compatible with two Arduinos, DUE and Giga Wifi R1. When using the Arduino Giga platform, the amplifier has a WiFi connection and remote control.
The user interface is a Nextion 5" or 7" touch screen. A visual and easy-to-use graphical user interface is built into it.
There is a Java-based web page for remote use. The page shows all essential information about the amplifier's status, and the most important controls can be made using a browser.
The controller board supports one, two and four LDMOS module amplifiers, the settings menu allows you to select how many modules are in use, each current is measured separately. In addition, several different power and current ranges can be selected from the menu for the bar graph, making the displayed values more visual. The board also has historical data, including TRX relay switching times, time in standby mode and time on the transmitter. There is also a so-called trip meter for standby time, i.e. a user-resettable time counter.
A 0-3 dB programmable attenuator can be connected to the RF input, which can be used to change the level of the incoming signal on a band-by-band basis. To avoid damage, you can select which bands the amplifier will operate on.
WiFi settings are in their own menu, where you can configure the settings to match your network environment. Remotely using a browser, you connect using the selected IP address.
Main operating view
Four layer PWB (Kicad 3D)
PWB and Arduino board (DUE or GIGA)
Four module view
Two module view
One module view
Main setup page
WiFi setup page
Remote view