The timing grade receiver I have, a Z3801 absolutely lays down at the least possible amount of on frequency signal. My automotive grade Garmin is immune to even high levels. It may be that the slightest degradation is unacceptable to the Z3801. More testing is needed. If these anticipated transmitters are merely close in frequency with no actual energy at GPS frequencies, this looks like an excellent business opportunity for someone to make and sell GPS antennas with aggressive filtering. If they actually emit energy at GPS frequencies, we are pretty much done for. I have seen the Youtube video of a military GPS resisting jamming but I seriously doubt they would become common place.
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