I crossed checked with two different models of tinySA, and also compared against two other QRP transmitters using the same 50 dB attenuation chain at similar power levels. ?Only my zbitx showed the +-2.5 MHz sideband spurs. ?Other rigs did not.
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Also, after I disconnected and turned of the tinySA, I could still hear the spurs using a separate receiver placed near enough to a 50 Ohm dummy load the zbitx was transmitting into (but not close enough to overload the receiver).
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So, if others don't see these spurs, maybe I received a bad unit?
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73, Ron, n6ywu
