// CQDX.ru
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.
Photos credit by remoteqth.com
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
Price: TBD
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