Hi Diogo,
I've had the same issue and the good people at RF Explorer Support stated that this was indeed an imaging issue.
The RF Venue's Explorer Pro (rebranded 3G combo with upconverter and a BNC connector) solves it with filtering and it's definitely a required step up without emptying pockets.
Even the Signal Hound SA44B which is a more expensive unit exhibits a similar but equally annoying imaging issue although at 21.4Mhz since the LO is at 10.7Mhz.
I guess that things don't get much better than the 3G combo until the investment reaches TTI territory.
Thanks for your share.
Rui
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