Remote RX SWL box for OE2CRM

This is custom IP controlled switch box for Christoph OE2CRM. It allows him to switch RX antennas for his SDR RXs for MW and Tropical band SWL. Please visit his web for more and very interesting info!

Main functions:

• Remote controled RX antennas switch with BPF / ATT / Preamp
• Used parts
  • Remote manual IP switch, based on Arduino LINK
  • 9 RX ANTs switch with BPF, ATT and preamp PHOTO
  • Common mode current choke for RX cables LINK
  • Build in Simple aluminium 19-inch 2u rack case LINK

• Parameters
  • MW Low Path Filter cut off frequency abt 1,8 MHz
  • Tropical band BPF 4,5 to 5,5 MHz
  • ATT 10dB
  • Preamplifier with 2N5109 with more than 16dB gain
  • Common mode current choke with attenuation more than 30dB
  • RX line protection with diodes, PTC and neon lamps

• Please visit Christoph's blog

UPGRADE in 2021: Please visit this link

Measured values:

Preamp	Bypass	ATT	LPF LF band
Preamp MF filter	5MHz BPF	Preamp 5MHz BPF

Download

Parts
Manual IP Switch			web
RF parts
9 RX antennas switch	Schematic	Board	ZIP269
Enclosure
Drawing		DXF402	Design481
Open-Hardware
We believe open source is a better way of doing things. View and download the Shield Schematic and PCB Kicad/Eagle CAD files, LibreCAD .DXF, or Inkscape .SVG files. The hardware designs are released under the Creative Commons Attribution-ShareAlike 4.0 International License

Users implementation photos