Yes sir I am using Spike software. I have re-started the software but I don’t think I have re-started the computer or R&R the USB cable. I’ll try that next. I tried it with a 10 MHz signal and could just start to see the carrier on the right side of the screen as if my center frequency entry was not displaying properly in the center. Since the external reference corrects the issue maybe something is wrong with the intrnal R.O. Thanks for the quick reply.

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