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Another vote fo the XTR-690/Pro-78 -- I own one and it's a fantastic detector.
As far as VG2 on Cobra, VG2 steady on means the detector found VG-2 type emissions, blinking means it detected Spectre I
Both do not affect the oscillator; the Cobras were designed to be immune/undetectable by the two, and only detect these RDD's as a FYI. Most people have found this detection to be pretty unreliable though. Gas stations love to false on VG2
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Depending on the model. Mine gives separate alerts for VG2 and Spectre. But I tried it and POP on for one day and my detector went crazy. With everything off, it's a night and day difference.
