EME222 SDR Recever Antenna Switch
The Software Defined Radio, ( SDR ) RX Switch has been designed to allow an SDR or additional Receiver to be used in conjunction with a HF Radio Transceiver on a single Antenna. The switch provides >70dB isolation protection to the SDR RX when RF is applied to the Radio TRX connection from a 100 Watt HF Transceiver. In receive mode, a two way RF splitter is used to split the incoming Antenna signals between the SDR RX, and Radio TRX connectors. The switch is ideal if you want to use a SDR Play or similar SDR receiver for a spectrum scope on the same Antenna as a HF Transceiver. The switch has a hard wired PTT input that suits most Transceivers, and also an RF detector circuit for further protection incase the hard wired PTT is not connected. When the switch is powered off, the SDR RX connection is terminated into 50ohms, and the Antenna is connected to the Radio TRX connection through the Relays.
1/ There are no current alerts.
The images below show both sides of the board. The construction is quite easy if you start with the SMD components on the bottom side of the board first, and then fit the conventional leaded components and connectors after. The only difficult part is the correct orientation of the 2 way splitter. There is a small resistor on the top of the component that should line up with the squiggly line of the board overlay. Click the pictures below for a more detailed view.