Don't pay too much attention to the 0.43dB value seen on the delta marker in the plots as this jumps around quite a bit even with lots of averaging.? However, there's about a 3.5dB difference (Y factor) between hot and cold so the ENR is going to be in the ballpark of 0.7dB lower at 2MHz?
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On my old notes I only saw about 0.2dB noise droop at 2MHz but I probably didn't take that much time or care over this. I may have used a different INGaP MMIC as well. I'll try and sort out the preamp over the weekend. The VSWR and frequency response is already quite good but I can make it even better.
