Iz,

The antuino is designed to output -20dbm at SNA port but a lot of them have escaped the plant
at -10db and -10dbm saturates the AD8307 and flatten the peaks. Change R20 to 1.2K and the
in/out short show display -20dbm on the display.

Raj

At 21-10-19, you wrote:

I am a proud owner of Antuino. I think it delivers around +10dbm in SNA plot function (correct me if I am wrong) at the RF out and at RF in on SWR plot function. Even if it shows - 20db on the plot. I have seen specs of crystal filters suggesting a maximum level of - 10dbm. So around 20db attenuator should be carefully added between the the Antuino and the crystal filter. Is this correct? I have seen however a datasheet of a crystal filter saying -10dbm max, however +16dbm for less than 10 seconds. So I am a bit confused on how to test safely crystal filters with an antenna analyzer or Antuino.