If you only have 1 AUX port, you will need it to connect more than one device to the oscilloscope (e.g. Wi-Fi, Focuser or StarSense). If you have 2 extra ports on your oscilloscope and want to add all the cool gizmos and gadgets, you need at least one splitter. I am using this splitter on a CPC 1100 GPS (XLT) SCT and it works. a StarSense, Focuser and Wifi module using all my auxiliary ports (1 with a splitter and another port).
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