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Hi

I have tried the nanoVNA_800_aa_20190802.dfu F/W too. The trace is the same as the NanoVNA-H__800_ch_20190924.dfu.

I strongly believe that when approaching 300 MHz, with the fundamental frequency, the NanoVNA doesn't work properly which the below spectrum plots also show. Is there a F/W that goes to e.g. 266 2/3 MHz and then has a max of 800 MHz, or 250 MHz/750 MHz...? If so I would love to try it.

Unfortunately I can't use the 8753 these days - maybe next week. But, I have measured the LPF using my signal generator and spectrum analyzer, and there is no abrupt change in the attenuation.

Bo