QO-100 - 2021 base-station

The frontpanel contains three toggle-switches to control the various components:

1. 28VDC to the final power amplifier
2. 12VDC to the LNB via the bias-T
3. 5VDC to the LNA in front of the final power amplifier

And a "huge" LCD display for some status information

• Device input voltage
• Final power amplifier current draw
• Final power amplifier supply voltage
• Final power amplifier heatsink temperature
• Internal 5VDC rail

 The toggle-switch right to the display switches the layout of the LCD display.

Piggy-back on the HELTEC module is a simple break out board for the ADS1115 ADC.

The source-code can be found here.

The main components are (clockwise from right top):

• Heatsink with LNA attached on top 
• Final power amplifier frm SG-Labs
• Homemade Bias-T for the LNB connection
• 13VDC Powerpole input
• LimeSDR-mini with small fan inside a 3D-printend enclosure
• DC current sensor for 12VDC rail
• ESP32 based microcontroller with LCD and 4 channel ADC
• DC power distribution PCB with cage clamps
• fuse block for 5VDC, 12VDC and 28VDC
• DC/DC converter from 13VDC to 5VDC for LNA and microcontroller (eBay)
• DC/DC converter from 13VDC to 28VDC for the final PA (eBay)

From left to right:

• USB3 connector to the LimeSDR-mini
• 13VDC powerpole connector
• F-socket to the LNB / RX antenna
• SMA-socket to the TX antenna