Showing signal when there is no input

Quote from CYW on 28/08/2023, 17:36I send a 1.2 GHz microwave signal to RSA 250X. Besides the expected signal at 1.2 GHz, RTSA also shows an unexpected signal whose frequency is 1650 Hz lower than 1.2 GHz. I then turn off the microwave source. The peak at 1.2 GHz disappears as expected. The unexpected signal whose frequency is 1650 Hz lower than 1.2 GHz, however, remains there, even though the microwave source is off. In addition, the amplitude of that unexpected signal remains the same no matter the microwave source is on or off. The spectrum of these 2 cases (microwave source on and off) are attached.
How can I get rid of this weird bug?
I send a 1.2 GHz microwave signal to RSA 250X. Besides the expected signal at 1.2 GHz, RTSA also shows an unexpected signal whose frequency is 1650 Hz lower than 1.2 GHz. I then turn off the microwave source. The peak at 1.2 GHz disappears as expected. The unexpected signal whose frequency is 1650 Hz lower than 1.2 GHz, however, remains there, even though the microwave source is off. In addition, the amplitude of that unexpected signal remains the same no matter the microwave source is on or off. The spectrum of these 2 cases (microwave source on and off) are attached.
How can I get rid of this weird bug?
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Quote from AdminTC on 30/08/2023, 19:24Interesting... looks like you are catching a signal over the Rx. Try an open Rx and it should be much less. Will offer an additional notch filter within one of the next builds to remove it in total.
Interesting... looks like you are catching a signal over the Rx. Try an open Rx and it should be much less. Will offer an additional notch filter within one of the next builds to remove it in total.