I didn’t even think of it when I was designing the TASS-R relay switch system, but the relay board can be used with an HPSDR Hermes, ANAN-10, or ANAN-100/200 radio without requiring use of an Arduino or other controller. These radios provide 7 open collector outputs that can be programmed from within the PowerSDR software. A simple interface board allows the TASS-R to be controlled by these outputs.
The idea is that two of the outputs can be used as binary bits to control one half of a decoder chip (74HC139) that will drive 4 of the TASS-R’s relays. Two more outputs fed to the other half of the chip can drive the other 4. If you want to control the branching relay (“K9”) a fifth output can be used for that with a simple transistor inverter.
This setup would allow you to switch up to four filters/preamps/ in a double pole configuration, based on the band selected in PowerSDR. Or up to 8 receive antennas could automatically be selected. Or whatever else you’d like to do.
Here’s a schematic for such a board. I haven’t built it yet, but it *should* work.
