It would not make sense to keep Software up to date on this Page.

Instead I´m showing you where to download the latest Version and how to adjust it for work with your Sandwich.

Go to Guido´s GitHub Page (into Branch -> Feature RX Improved)

The RX Improved Branch is a) way better in Performance then current Release Version “j” and b) the only Version, that supports Relay switching at this time.

Click on the green “Code” Button and select: Download Zip

Then you have a (compressed) copy of the most recent GitHub Content on your Hard Disk. For programming the Software into the uSDX you need also Arduino Studio Software and a cheap Arduino UNO Board (or compatible)

There need to be some very minor changes in code in order to match your Hardware Setup. After opening the INO File (with Arduino Studio) from your (QCX SSB) Download, you should see the following situation:

This is most of the adjustment options, that are available.

Anything with “//” in front of the line is disabled (greyed out) and anything without those 2 slashes in front, is active.

Let´s assume, we have and OLED IO Board and 8-Band RF Board, then you need to remove the // in front of line 18 and 21. Since CAT is using a lot of resources, you also need to disable DIAG Option (to have enough memory for CAT), in case you want to use CAT. Put // in front of line 10. The Result should look like this:

This would be basically it, but there´s one hidden feature: The PA Output. If you want to Control PTT of an external PA, you additionally need to acticate one of the 2 Lines (depending of what your PA needs):

Either Line 48 OR Line 49 may be active:

Let´s say, our PA needs a PTT Signal, that is active LOW, then you need to remove // in front of line 48:

That´s it. Now you can save the File and upload it to your sandwich.

Another Example: LCD Board and 5-Band Board:

LCD Board does not support CAT Interface, so it can be disabled.

And we need to activate the right relay Board:

That´s all…..

Special Tip: After first installation, use a commercial rig, to find out your true crystal frequency. Go to Menu 8.1 Ref Freq, and adjust it. Exact procedure: Connect you uSDX to a Dummy load and set it to CW. Set your Commercial Rig to a Certain Frequency in Mode CW, and set the uSDX to the same frequency. Then TX and adjust “Ref Freq” until you´re at zero beat / center of filter on your commercial rig. Write that frequency down. I put a sticker on every of my mainboards with the excact crystal frequency:

This frequency won´t change, so you can also enter that number directly into the INO File before next upload:

Additional Help how to program I have put together in this Video: